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</pre><pre class='rust '>
<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>;
<span class='kw'>use</span> <span class='ident'>buffer</span>::{<span class='ident'>BufferResult</span>, <span class='ident'>RefReadBuffer</span>, <span class='ident'>RefWriteBuffer</span>};
<span class='kw'>use</span> <span class='ident'>symmetriccipher</span>::{<span class='ident'>Encryptor</span>, <span class='ident'>Decryptor</span>, <span class='ident'>SynchronousStreamCipher</span>, <span class='ident'>SymmetricCipherError</span>};
<span class='kw'>use</span> <span class='ident'>cryptoutil</span>::{<span class='ident'>read_u32_le</span>, <span class='ident'>symm_enc_or_dec</span>, <span class='ident'>write_u32_le</span>, <span class='ident'>xor_keystream</span>};
<span class='kw'>use</span> <span class='ident'>simd</span>::<span class='ident'>u32x4</span>;
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>,<span class='ident'>Copy</span>)]</span>
<span class='kw'>struct</span> <span class='ident'>ChaChaState</span> {
<span class='ident'>a</span>: <span class='ident'>u32x4</span>,
<span class='ident'>b</span>: <span class='ident'>u32x4</span>,
<span class='ident'>c</span>: <span class='ident'>u32x4</span>,
<span class='ident'>d</span>: <span class='ident'>u32x4</span>
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ChaCha20</span> {
<span class='ident'>state</span> : <span class='ident'>ChaChaState</span>,
<span class='ident'>output</span> : [<span class='ident'>u8</span>; <span class='number'>64</span>],
<span class='ident'>offset</span> : <span class='ident'>usize</span>,
}
<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>ChaCha20</span> { <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>ChaCha20</span> { <span class='kw-2'>*</span><span class='self'>self</span> } }
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>swizzle</span>{
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>d</span>: <span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>b10</span>, <span class='ident'>b11</span>, <span class='ident'>b12</span>, <span class='ident'>b13</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>b11</span>, <span class='ident'>b12</span>, <span class='ident'>b13</span>, <span class='ident'>b10</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>c10</span>, <span class='ident'>c11</span>, <span class='ident'>c12</span>, <span class='ident'>c13</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>c12</span>, <span class='ident'>c13</span>,<span class='ident'>c10</span>, <span class='ident'>c11</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>d10</span>, <span class='ident'>d11</span>, <span class='ident'>d12</span>, <span class='ident'>d13</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>d</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>d</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>d13</span>, <span class='ident'>d10</span>, <span class='ident'>d11</span>, <span class='ident'>d12</span>);
}}
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>state_to_buffer</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>output</span>: <span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>a1</span>, <span class='ident'>a2</span>, <span class='ident'>a3</span>, <span class='ident'>a4</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>a</span>;
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>b1</span>, <span class='ident'>b2</span>, <span class='ident'>b3</span>, <span class='ident'>b4</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>b</span>;
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>, <span class='ident'>c3</span>, <span class='ident'>c4</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>c</span>;
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>d1</span>, <span class='ident'>d2</span>, <span class='ident'>d3</span>, <span class='ident'>d4</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>d</span>;
<span class='kw'>let</span> <span class='ident'>lens</span> <span class='op'>=</span> [
<span class='ident'>a1</span>,<span class='ident'>a2</span>,<span class='ident'>a3</span>,<span class='ident'>a4</span>,
<span class='ident'>b1</span>,<span class='ident'>b2</span>,<span class='ident'>b3</span>,<span class='ident'>b4</span>,
<span class='ident'>c1</span>,<span class='ident'>c2</span>,<span class='ident'>c3</span>,<span class='ident'>c4</span>,
<span class='ident'>d1</span>,<span class='ident'>d2</span>,<span class='ident'>d3</span>,<span class='ident'>d4</span>
];
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='ident'>lens</span>.<span class='ident'>len</span>() {
<span class='ident'>write_u32_le</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>output</span>[<span class='ident'>i</span><span class='kw-2'>*</span><span class='number'>4</span>..(<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>)<span class='kw-2'>*</span><span class='number'>4</span>], <span class='ident'>lens</span>[<span class='ident'>i</span>]);
}
}}
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>round</span>{
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>: <span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>a</span> <span class='op'>+</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>b</span>;
<span class='macro'>rotate</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>d</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>a</span>, <span class='ident'>S16</span>);
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>c</span> <span class='op'>+</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>d</span>;
<span class='macro'>rotate</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>b</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>c</span>, <span class='ident'>S12</span>);
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>a</span> <span class='op'>+</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>b</span>;
<span class='macro'>rotate</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>d</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>a</span>, <span class='ident'>S8</span>);
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>c</span> <span class='op'>+</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>d</span>;
<span class='macro'>rotate</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>b</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>state</span>.<span class='ident'>c</span>, <span class='ident'>S7</span>);
}}
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>rotate</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span> <span class='op'>^</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>;
<span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='ident'>S32</span> <span class='op'>-</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>;
<span class='kw'>let</span> <span class='ident'>right</span> <span class='op'>=</span> <span class='ident'>v</span> <span class='op'>>></span> <span class='ident'>r</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span> <span class='op'>=</span> (<span class='ident'>v</span> <span class='op'><<</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>) <span class='op'>^</span> <span class='ident'>right</span>
}}
}
<span class='kw'>static</span> <span class='ident'>S32</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>32</span>, <span class='number'>32</span>, <span class='number'>32</span>, <span class='number'>32</span>);
<span class='kw'>static</span> <span class='ident'>S16</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>16</span>, <span class='number'>16</span>, <span class='number'>16</span>, <span class='number'>16</span>);
<span class='kw'>static</span> <span class='ident'>S12</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>12</span>, <span class='number'>12</span>, <span class='number'>12</span>, <span class='number'>12</span>);
<span class='kw'>static</span> <span class='ident'>S8</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>8</span>, <span class='number'>8</span>, <span class='number'>8</span>, <span class='number'>8</span>);
<span class='kw'>static</span> <span class='ident'>S7</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>7</span>, <span class='number'>7</span>, <span class='number'>7</span>, <span class='number'>7</span>);
<span class='kw'>impl</span> <span class='ident'>ChaCha20</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>key</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>], <span class='ident'>nonce</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>]) <span class='op'>-></span> <span class='ident'>ChaCha20</span> {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>key</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>16</span> <span class='op'>||</span> <span class='ident'>key</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>32</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>nonce</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>8</span> <span class='op'>||</span> <span class='ident'>nonce</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>12</span>);
<span class='ident'>ChaCha20</span>{ <span class='ident'>state</span>: <span class='ident'>ChaCha20</span>::<span class='ident'>expand</span>(<span class='ident'>key</span>, <span class='ident'>nonce</span>), <span class='ident'>output</span>: [<span class='number'>0u8</span>; <span class='number'>64</span>], <span class='ident'>offset</span>: <span class='number'>64</span> }
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new_xchacha20</span>(<span class='ident'>key</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>], <span class='ident'>nonce</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>]) <span class='op'>-></span> <span class='ident'>ChaCha20</span> {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>key</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>32</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>nonce</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>24</span>);
<span class='comment'>// HChaCha20 produces a 256-bit output block starting from a 512 bit</span>
<span class='comment'>// input block where (x0,x1,...,x15) where</span>
<span class='comment'>//</span>
<span class='comment'>// * (x0, x1, x2, x3) is the ChaCha20 constant.</span>
<span class='comment'>// * (x4, x5, ... x11) is a 256 bit key.</span>
<span class='comment'>// * (x12, x13, x14, x15) is a 128 bit nonce.</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>xchacha20</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>{ <span class='ident'>state</span>: <span class='ident'>ChaCha20</span>::<span class='ident'>expand</span>(<span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>0</span>..<span class='number'>16</span>]), <span class='ident'>output</span>: [<span class='number'>0u8</span>; <span class='number'>64</span>], <span class='ident'>offset</span>: <span class='number'>64</span> };
<span class='comment'>// Use HChaCha to derive the subkey, and initialize a ChaCha20 instance</span>
<span class='comment'>// with the subkey and the remaining 8 bytes of the nonce.</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new_key</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>32</span>];
<span class='ident'>xchacha20</span>.<span class='ident'>hchacha20</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>new_key</span>);
<span class='ident'>xchacha20</span>.<span class='ident'>state</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>::<span class='ident'>expand</span>(<span class='kw-2'>&</span><span class='ident'>new_key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>16</span>..<span class='number'>24</span>]);
<span class='ident'>xchacha20</span>
}
<span class='kw'>fn</span> <span class='ident'>expand</span>(<span class='ident'>key</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>], <span class='ident'>nonce</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>]) <span class='op'>-></span> <span class='ident'>ChaChaState</span> {
<span class='kw'>let</span> <span class='ident'>constant</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>key</span>.<span class='ident'>len</span>() {
<span class='number'>16</span> <span class='op'>=></span> <span class='string'>b"expand 16-byte k"</span>,
<span class='number'>32</span> <span class='op'>=></span> <span class='string'>b"expand 32-byte k"</span>,
_ <span class='op'>=></span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
};
<span class='ident'>ChaChaState</span> {
<span class='ident'>a</span>: <span class='ident'>u32x4</span>(
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>constant</span>[<span class='number'>0</span>..<span class='number'>4</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>constant</span>[<span class='number'>4</span>..<span class='number'>8</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>constant</span>[<span class='number'>8</span>..<span class='number'>12</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>constant</span>[<span class='number'>12</span>..<span class='number'>16</span>])
),
<span class='ident'>b</span>: <span class='ident'>u32x4</span>(
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>0</span>..<span class='number'>4</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>4</span>..<span class='number'>8</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>8</span>..<span class='number'>12</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>12</span>..<span class='number'>16</span>])
),
<span class='ident'>c</span>: <span class='kw'>if</span> <span class='ident'>key</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>16</span> {
<span class='ident'>u32x4</span>(
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>0</span>..<span class='number'>4</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>4</span>..<span class='number'>8</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>8</span>..<span class='number'>12</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>12</span>..<span class='number'>16</span>])
)
} <span class='kw'>else</span> {
<span class='ident'>u32x4</span>(
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>16</span>..<span class='number'>20</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>20</span>..<span class='number'>24</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>24</span>..<span class='number'>28</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>28</span>..<span class='number'>32</span>])
)
},
<span class='ident'>d</span>: <span class='kw'>if</span> <span class='ident'>nonce</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>16</span> {
<span class='ident'>u32x4</span>(
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>0</span>..<span class='number'>4</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>4</span>..<span class='number'>8</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>8</span>..<span class='number'>12</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>12</span>..<span class='number'>16</span>])
)
} <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>nonce</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>12</span> {
<span class='ident'>u32x4</span>(
<span class='number'>0</span>,
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>0</span>..<span class='number'>4</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>4</span>..<span class='number'>8</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>8</span>..<span class='number'>12</span>])
)
} <span class='kw'>else</span> {
<span class='ident'>u32x4</span>(
<span class='number'>0</span>,
<span class='number'>0</span>,
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>0</span>..<span class='number'>4</span>]),
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>nonce</span>[<span class='number'>4</span>..<span class='number'>8</span>])
)
}
}
}
<span class='kw'>fn</span> <span class='ident'>hchacha20</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>out</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) <span class='op'>-></span> () {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>state</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>state</span>;
<span class='comment'>// Apply r/2 iterations of the same "double-round" function,</span>
<span class='comment'>// obtaining (z0, z1, ... z15) = doubleround r/2 (x0, x1, ... x15).</span>
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>10</span> {
<span class='macro'>round</span><span class='macro'>!</span>(<span class='ident'>state</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>b10</span>, <span class='ident'>b11</span>, <span class='ident'>b12</span>, <span class='ident'>b13</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>b</span>;
<span class='ident'>state</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>b11</span>, <span class='ident'>b12</span>, <span class='ident'>b13</span>, <span class='ident'>b10</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>c10</span>, <span class='ident'>c11</span>, <span class='ident'>c12</span>, <span class='ident'>c13</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>c</span>;
<span class='ident'>state</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>c12</span>, <span class='ident'>c13</span>,<span class='ident'>c10</span>, <span class='ident'>c11</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>d10</span>, <span class='ident'>d11</span>, <span class='ident'>d12</span>, <span class='ident'>d13</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>d</span>;
<span class='ident'>state</span>.<span class='ident'>d</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>d13</span>, <span class='ident'>d10</span>, <span class='ident'>d11</span>, <span class='ident'>d12</span>);
<span class='macro'>round</span><span class='macro'>!</span>(<span class='ident'>state</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>b20</span>, <span class='ident'>b21</span>, <span class='ident'>b22</span>, <span class='ident'>b23</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>b</span>;
<span class='ident'>state</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>b23</span>, <span class='ident'>b20</span>, <span class='ident'>b21</span>, <span class='ident'>b22</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>c20</span>, <span class='ident'>c21</span>, <span class='ident'>c22</span>, <span class='ident'>c23</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>c</span>;
<span class='ident'>state</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>c22</span>, <span class='ident'>c23</span>, <span class='ident'>c20</span>, <span class='ident'>c21</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>d20</span>, <span class='ident'>d21</span>, <span class='ident'>d22</span>, <span class='ident'>d23</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>d</span>;
<span class='ident'>state</span>.<span class='ident'>d</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>d21</span>, <span class='ident'>d22</span>, <span class='ident'>d23</span>, <span class='ident'>d20</span>);
}
<span class='comment'>// HChaCha20 then outputs the 256-bit block (z0, z1, z2, z3, z12, z13,</span>
<span class='comment'>// z14, z15). These correspond to the constant and input positions in</span>
<span class='comment'>// the ChaCha matrix.</span>
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>a1</span>, <span class='ident'>a2</span>, <span class='ident'>a3</span>, <span class='ident'>a4</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>a</span>;
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>d1</span>, <span class='ident'>d2</span>, <span class='ident'>d3</span>, <span class='ident'>d4</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>d</span>;
<span class='kw'>let</span> <span class='ident'>lens</span> <span class='op'>=</span> [
<span class='ident'>a1</span>,<span class='ident'>a2</span>,<span class='ident'>a3</span>,<span class='ident'>a4</span>,
<span class='ident'>d1</span>,<span class='ident'>d2</span>,<span class='ident'>d3</span>,<span class='ident'>d4</span>
];
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='ident'>lens</span>.<span class='ident'>len</span>() {
<span class='ident'>write_u32_le</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>out</span>[<span class='ident'>i</span><span class='kw-2'>*</span><span class='number'>4</span>..(<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>)<span class='kw-2'>*</span><span class='number'>4</span>], <span class='ident'>lens</span>[<span class='ident'>i</span>]);
}
}
<span class='comment'>// put the the next 64 keystream bytes into self.output</span>
<span class='kw'>fn</span> <span class='ident'>update</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>state</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>state</span>;
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>10</span> {
<span class='macro'>round</span><span class='macro'>!</span>(<span class='ident'>state</span>);
<span class='macro'>swizzle</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>state</span>.<span class='ident'>c</span>, <span class='ident'>state</span>.<span class='ident'>d</span>);
<span class='macro'>round</span><span class='macro'>!</span>(<span class='ident'>state</span>);
<span class='macro'>swizzle</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>d</span>, <span class='ident'>state</span>.<span class='ident'>c</span>, <span class='ident'>state</span>.<span class='ident'>b</span>);
}
<span class='ident'>state</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>a</span> <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>a</span>;
<span class='ident'>state</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>b</span> <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>b</span>;
<span class='ident'>state</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>c</span> <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>c</span>;
<span class='ident'>state</span>.<span class='ident'>d</span> <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>d</span> <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>d</span>;
<span class='macro'>state_to_buffer</span><span class='macro'>!</span>(<span class='ident'>state</span>, <span class='self'>self</span>.<span class='ident'>output</span>);
<span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>d</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>d</span> <span class='op'>+</span> <span class='ident'>u32x4</span>(<span class='number'>1</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>c12</span>, _, _, _) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>d</span>;
<span class='kw'>if</span> <span class='ident'>c12</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='comment'>// we could increment the other counter word with an 8 byte nonce</span>
<span class='comment'>// but other implementations like boringssl have this same</span>
<span class='comment'>// limitation</span>
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"counter is exhausted"</span>);
}
<span class='self'>self</span>.<span class='ident'>offset</span> <span class='op'>=</span> <span class='number'>0</span>;
}
}
<span class='kw'>impl</span> <span class='ident'>SynchronousStreamCipher</span> <span class='kw'>for</span> <span class='ident'>ChaCha20</span> {
<span class='kw'>fn</span> <span class='ident'>process</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>input</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>], <span class='ident'>output</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>input</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='ident'>output</span>.<span class='ident'>len</span>());
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>input</span>.<span class='ident'>len</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>while</span> <span class='ident'>i</span> <span class='op'><</span> <span class='ident'>len</span> {
<span class='comment'>// If there is no keystream available in the output buffer,</span>
<span class='comment'>// generate the next block.</span>
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>offset</span> <span class='op'>==</span> <span class='number'>64</span> {
<span class='self'>self</span>.<span class='ident'>update</span>();
}
<span class='comment'>// Process the min(available keystream, remaining input length).</span>
<span class='kw'>let</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='ident'>cmp</span>::<span class='ident'>min</span>(<span class='number'>64</span> <span class='op'>-</span> <span class='self'>self</span>.<span class='ident'>offset</span>, <span class='ident'>len</span> <span class='op'>-</span> <span class='ident'>i</span>);
<span class='ident'>xor_keystream</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>[<span class='ident'>i</span>..<span class='ident'>i</span><span class='op'>+</span><span class='ident'>count</span>], <span class='kw-2'>&</span><span class='ident'>input</span>[<span class='ident'>i</span>..<span class='ident'>i</span><span class='op'>+</span><span class='ident'>count</span>], <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>output</span>[<span class='self'>self</span>.<span class='ident'>offset</span>..]);
<span class='ident'>i</span> <span class='op'>+=</span> <span class='ident'>count</span>;
<span class='self'>self</span>.<span class='ident'>offset</span> <span class='op'>+=</span> <span class='ident'>count</span>;
}
}
}
<span class='kw'>impl</span> <span class='ident'>Encryptor</span> <span class='kw'>for</span> <span class='ident'>ChaCha20</span> {
<span class='kw'>fn</span> <span class='ident'>encrypt</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>input</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>RefReadBuffer</span>, <span class='ident'>output</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>RefWriteBuffer</span>, _: <span class='ident'>bool</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>BufferResult</span>, <span class='ident'>SymmetricCipherError</span><span class='op'>></span> {
<span class='ident'>symm_enc_or_dec</span>(<span class='self'>self</span>, <span class='ident'>input</span>, <span class='ident'>output</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>Decryptor</span> <span class='kw'>for</span> <span class='ident'>ChaCha20</span> {
<span class='kw'>fn</span> <span class='ident'>decrypt</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>input</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>RefReadBuffer</span>, <span class='ident'>output</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>RefWriteBuffer</span>, _: <span class='ident'>bool</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>BufferResult</span>, <span class='ident'>SymmetricCipherError</span><span class='op'>></span> {
<span class='ident'>symm_enc_or_dec</span>(<span class='self'>self</span>, <span class='ident'>input</span>, <span class='ident'>output</span>)
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>test</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>repeat</span>;
<span class='kw'>use</span> <span class='ident'>chacha20</span>::<span class='ident'>ChaCha20</span>;
<span class='kw'>use</span> <span class='ident'>symmetriccipher</span>::<span class='ident'>SynchronousStreamCipher</span>;
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_chacha20_256_tls_vectors</span>() {
<span class='kw'>struct</span> <span class='ident'>TestVector</span> {
<span class='ident'>key</span>: [<span class='ident'>u8</span>; <span class='number'>32</span>],
<span class='ident'>nonce</span>: [<span class='ident'>u8</span>; <span class='number'>8</span>],
<span class='ident'>keystream</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>,
};
<span class='comment'>// taken from http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04</span>
<span class='kw'>let</span> <span class='ident'>test_vectors</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0x76</span>, <span class='number'>0xb8</span>, <span class='number'>0xe0</span>, <span class='number'>0xad</span>, <span class='number'>0xa0</span>, <span class='number'>0xf1</span>, <span class='number'>0x3d</span>, <span class='number'>0x90</span>,
<span class='number'>0x40</span>, <span class='number'>0x5d</span>, <span class='number'>0x6a</span>, <span class='number'>0xe5</span>, <span class='number'>0x53</span>, <span class='number'>0x86</span>, <span class='number'>0xbd</span>, <span class='number'>0x28</span>,
<span class='number'>0xbd</span>, <span class='number'>0xd2</span>, <span class='number'>0x19</span>, <span class='number'>0xb8</span>, <span class='number'>0xa0</span>, <span class='number'>0x8d</span>, <span class='number'>0xed</span>, <span class='number'>0x1a</span>,
<span class='number'>0xa8</span>, <span class='number'>0x36</span>, <span class='number'>0xef</span>, <span class='number'>0xcc</span>, <span class='number'>0x8b</span>, <span class='number'>0x77</span>, <span class='number'>0x0d</span>, <span class='number'>0xc7</span>,
<span class='number'>0xda</span>, <span class='number'>0x41</span>, <span class='number'>0x59</span>, <span class='number'>0x7c</span>, <span class='number'>0x51</span>, <span class='number'>0x57</span>, <span class='number'>0x48</span>, <span class='number'>0x8d</span>,
<span class='number'>0x77</span>, <span class='number'>0x24</span>, <span class='number'>0xe0</span>, <span class='number'>0x3f</span>, <span class='number'>0xb8</span>, <span class='number'>0xd8</span>, <span class='number'>0x4a</span>, <span class='number'>0x37</span>,
<span class='number'>0x6a</span>, <span class='number'>0x43</span>, <span class='number'>0xb8</span>, <span class='number'>0xf4</span>, <span class='number'>0x15</span>, <span class='number'>0x18</span>, <span class='number'>0xa1</span>, <span class='number'>0x1c</span>,
<span class='number'>0xc3</span>, <span class='number'>0x87</span>, <span class='number'>0xb6</span>, <span class='number'>0x69</span>, <span class='number'>0xb2</span>, <span class='number'>0xee</span>, <span class='number'>0x65</span>, <span class='number'>0x86</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x01</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0x45</span>, <span class='number'>0x40</span>, <span class='number'>0xf0</span>, <span class='number'>0x5a</span>, <span class='number'>0x9f</span>, <span class='number'>0x1f</span>, <span class='number'>0xb2</span>, <span class='number'>0x96</span>,
<span class='number'>0xd7</span>, <span class='number'>0x73</span>, <span class='number'>0x6e</span>, <span class='number'>0x7b</span>, <span class='number'>0x20</span>, <span class='number'>0x8e</span>, <span class='number'>0x3c</span>, <span class='number'>0x96</span>,
<span class='number'>0xeb</span>, <span class='number'>0x4f</span>, <span class='number'>0xe1</span>, <span class='number'>0x83</span>, <span class='number'>0x46</span>, <span class='number'>0x88</span>, <span class='number'>0xd2</span>, <span class='number'>0x60</span>,
<span class='number'>0x4f</span>, <span class='number'>0x45</span>, <span class='number'>0x09</span>, <span class='number'>0x52</span>, <span class='number'>0xed</span>, <span class='number'>0x43</span>, <span class='number'>0x2d</span>, <span class='number'>0x41</span>,
<span class='number'>0xbb</span>, <span class='number'>0xe2</span>, <span class='number'>0xa0</span>, <span class='number'>0xb6</span>, <span class='number'>0xea</span>, <span class='number'>0x75</span>, <span class='number'>0x66</span>, <span class='number'>0xd2</span>,
<span class='number'>0xa5</span>, <span class='number'>0xd1</span>, <span class='number'>0xe7</span>, <span class='number'>0xe2</span>, <span class='number'>0x0d</span>, <span class='number'>0x42</span>, <span class='number'>0xaf</span>, <span class='number'>0x2c</span>,
<span class='number'>0x53</span>, <span class='number'>0xd7</span>, <span class='number'>0x92</span>, <span class='number'>0xb1</span>, <span class='number'>0xc4</span>, <span class='number'>0x3f</span>, <span class='number'>0xea</span>, <span class='number'>0x81</span>,
<span class='number'>0x7e</span>, <span class='number'>0x9a</span>, <span class='number'>0xd2</span>, <span class='number'>0x75</span>, <span class='number'>0xae</span>, <span class='number'>0x54</span>, <span class='number'>0x69</span>, <span class='number'>0x63</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x01</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0xde</span>, <span class='number'>0x9c</span>, <span class='number'>0xba</span>, <span class='number'>0x7b</span>, <span class='number'>0xf3</span>, <span class='number'>0xd6</span>, <span class='number'>0x9e</span>, <span class='number'>0xf5</span>,
<span class='number'>0xe7</span>, <span class='number'>0x86</span>, <span class='number'>0xdc</span>, <span class='number'>0x63</span>, <span class='number'>0x97</span>, <span class='number'>0x3f</span>, <span class='number'>0x65</span>, <span class='number'>0x3a</span>,
<span class='number'>0x0b</span>, <span class='number'>0x49</span>, <span class='number'>0xe0</span>, <span class='number'>0x15</span>, <span class='number'>0xad</span>, <span class='number'>0xbf</span>, <span class='number'>0xf7</span>, <span class='number'>0x13</span>,
<span class='number'>0x4f</span>, <span class='number'>0xcb</span>, <span class='number'>0x7d</span>, <span class='number'>0xf1</span>, <span class='number'>0x37</span>, <span class='number'>0x82</span>, <span class='number'>0x10</span>, <span class='number'>0x31</span>,
<span class='number'>0xe8</span>, <span class='number'>0x5a</span>, <span class='number'>0x05</span>, <span class='number'>0x02</span>, <span class='number'>0x78</span>, <span class='number'>0xa7</span>, <span class='number'>0x08</span>, <span class='number'>0x45</span>,
<span class='number'>0x27</span>, <span class='number'>0x21</span>, <span class='number'>0x4f</span>, <span class='number'>0x73</span>, <span class='number'>0xef</span>, <span class='number'>0xc7</span>, <span class='number'>0xfa</span>, <span class='number'>0x5b</span>,
<span class='number'>0x52</span>, <span class='number'>0x77</span>, <span class='number'>0x06</span>, <span class='number'>0x2e</span>, <span class='number'>0xb7</span>, <span class='number'>0xa0</span>, <span class='number'>0x43</span>, <span class='number'>0x3e</span>,
<span class='number'>0x44</span>, <span class='number'>0x5f</span>, <span class='number'>0x41</span>, <span class='number'>0xe3</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x01</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0xef</span>, <span class='number'>0x3f</span>, <span class='number'>0xdf</span>, <span class='number'>0xd6</span>, <span class='number'>0xc6</span>, <span class='number'>0x15</span>, <span class='number'>0x78</span>, <span class='number'>0xfb</span>,
<span class='number'>0xf5</span>, <span class='number'>0xcf</span>, <span class='number'>0x35</span>, <span class='number'>0xbd</span>, <span class='number'>0x3d</span>, <span class='number'>0xd3</span>, <span class='number'>0x3b</span>, <span class='number'>0x80</span>,
<span class='number'>0x09</span>, <span class='number'>0x63</span>, <span class='number'>0x16</span>, <span class='number'>0x34</span>, <span class='number'>0xd2</span>, <span class='number'>0x1e</span>, <span class='number'>0x42</span>, <span class='number'>0xac</span>,
<span class='number'>0x33</span>, <span class='number'>0x96</span>, <span class='number'>0x0b</span>, <span class='number'>0xd1</span>, <span class='number'>0x38</span>, <span class='number'>0xe5</span>, <span class='number'>0x0d</span>, <span class='number'>0x32</span>,
<span class='number'>0x11</span>, <span class='number'>0x1e</span>, <span class='number'>0x4c</span>, <span class='number'>0xaf</span>, <span class='number'>0x23</span>, <span class='number'>0x7e</span>, <span class='number'>0xe5</span>, <span class='number'>0x3c</span>,
<span class='number'>0xa8</span>, <span class='number'>0xad</span>, <span class='number'>0x64</span>, <span class='number'>0x26</span>, <span class='number'>0x19</span>, <span class='number'>0x4a</span>, <span class='number'>0x88</span>, <span class='number'>0x54</span>,
<span class='number'>0x5d</span>, <span class='number'>0xdc</span>, <span class='number'>0x49</span>, <span class='number'>0x7a</span>, <span class='number'>0x0b</span>, <span class='number'>0x46</span>, <span class='number'>0x6e</span>, <span class='number'>0x7d</span>,
<span class='number'>0x6b</span>, <span class='number'>0xbd</span>, <span class='number'>0xb0</span>, <span class='number'>0x04</span>, <span class='number'>0x1b</span>, <span class='number'>0x2f</span>, <span class='number'>0x58</span>, <span class='number'>0x6b</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x01</span>, <span class='number'>0x02</span>, <span class='number'>0x03</span>, <span class='number'>0x04</span>, <span class='number'>0x05</span>, <span class='number'>0x06</span>, <span class='number'>0x07</span>,
<span class='number'>0x08</span>, <span class='number'>0x09</span>, <span class='number'>0x0a</span>, <span class='number'>0x0b</span>, <span class='number'>0x0c</span>, <span class='number'>0x0d</span>, <span class='number'>0x0e</span>, <span class='number'>0x0f</span>,
<span class='number'>0x10</span>, <span class='number'>0x11</span>, <span class='number'>0x12</span>, <span class='number'>0x13</span>, <span class='number'>0x14</span>, <span class='number'>0x15</span>, <span class='number'>0x16</span>, <span class='number'>0x17</span>,
<span class='number'>0x18</span>, <span class='number'>0x19</span>, <span class='number'>0x1a</span>, <span class='number'>0x1b</span>, <span class='number'>0x1c</span>, <span class='number'>0x1d</span>, <span class='number'>0x1e</span>, <span class='number'>0x1f</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x01</span>, <span class='number'>0x02</span>, <span class='number'>0x03</span>, <span class='number'>0x04</span>, <span class='number'>0x05</span>, <span class='number'>0x06</span>, <span class='number'>0x07</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0xf7</span>, <span class='number'>0x98</span>, <span class='number'>0xa1</span>, <span class='number'>0x89</span>, <span class='number'>0xf1</span>, <span class='number'>0x95</span>, <span class='number'>0xe6</span>, <span class='number'>0x69</span>,
<span class='number'>0x82</span>, <span class='number'>0x10</span>, <span class='number'>0x5f</span>, <span class='number'>0xfb</span>, <span class='number'>0x64</span>, <span class='number'>0x0b</span>, <span class='number'>0xb7</span>, <span class='number'>0x75</span>,
<span class='number'>0x7f</span>, <span class='number'>0x57</span>, <span class='number'>0x9d</span>, <span class='number'>0xa3</span>, <span class='number'>0x16</span>, <span class='number'>0x02</span>, <span class='number'>0xfc</span>, <span class='number'>0x93</span>,
<span class='number'>0xec</span>, <span class='number'>0x01</span>, <span class='number'>0xac</span>, <span class='number'>0x56</span>, <span class='number'>0xf8</span>, <span class='number'>0x5a</span>, <span class='number'>0xc3</span>, <span class='number'>0xc1</span>,
<span class='number'>0x34</span>, <span class='number'>0xa4</span>, <span class='number'>0x54</span>, <span class='number'>0x7b</span>, <span class='number'>0x73</span>, <span class='number'>0x3b</span>, <span class='number'>0x46</span>, <span class='number'>0x41</span>,
<span class='number'>0x30</span>, <span class='number'>0x42</span>, <span class='number'>0xc9</span>, <span class='number'>0x44</span>, <span class='number'>0x00</span>, <span class='number'>0x49</span>, <span class='number'>0x17</span>, <span class='number'>0x69</span>,
<span class='number'>0x05</span>, <span class='number'>0xd3</span>, <span class='number'>0xbe</span>, <span class='number'>0x59</span>, <span class='number'>0xea</span>, <span class='number'>0x1c</span>, <span class='number'>0x53</span>, <span class='number'>0xf1</span>,
<span class='number'>0x59</span>, <span class='number'>0x16</span>, <span class='number'>0x15</span>, <span class='number'>0x5c</span>, <span class='number'>0x2b</span>, <span class='number'>0xe8</span>, <span class='number'>0x24</span>, <span class='number'>0x1a</span>,
<span class='number'>0x38</span>, <span class='number'>0x00</span>, <span class='number'>0x8b</span>, <span class='number'>0x9a</span>, <span class='number'>0x26</span>, <span class='number'>0xbc</span>, <span class='number'>0x35</span>, <span class='number'>0x94</span>,
<span class='number'>0x1e</span>, <span class='number'>0x24</span>, <span class='number'>0x44</span>, <span class='number'>0x17</span>, <span class='number'>0x7c</span>, <span class='number'>0x8a</span>, <span class='number'>0xde</span>, <span class='number'>0x66</span>,
<span class='number'>0x89</span>, <span class='number'>0xde</span>, <span class='number'>0x95</span>, <span class='number'>0x26</span>, <span class='number'>0x49</span>, <span class='number'>0x86</span>, <span class='number'>0xd9</span>, <span class='number'>0x58</span>,
<span class='number'>0x89</span>, <span class='number'>0xfb</span>, <span class='number'>0x60</span>, <span class='number'>0xe8</span>, <span class='number'>0x46</span>, <span class='number'>0x29</span>, <span class='number'>0xc9</span>, <span class='number'>0xbd</span>,
<span class='number'>0x9a</span>, <span class='number'>0x5a</span>, <span class='number'>0xcb</span>, <span class='number'>0x1c</span>, <span class='number'>0xc1</span>, <span class='number'>0x18</span>, <span class='number'>0xbe</span>, <span class='number'>0x56</span>,
<span class='number'>0x3e</span>, <span class='number'>0xb9</span>, <span class='number'>0xb3</span>, <span class='number'>0xa4</span>, <span class='number'>0xa4</span>, <span class='number'>0x72</span>, <span class='number'>0xf8</span>, <span class='number'>0x2e</span>,
<span class='number'>0x09</span>, <span class='number'>0xa7</span>, <span class='number'>0xe7</span>, <span class='number'>0x78</span>, <span class='number'>0x49</span>, <span class='number'>0x2b</span>, <span class='number'>0x56</span>, <span class='number'>0x2e</span>,
<span class='number'>0xf7</span>, <span class='number'>0x13</span>, <span class='number'>0x0e</span>, <span class='number'>0x88</span>, <span class='number'>0xdf</span>, <span class='number'>0xe0</span>, <span class='number'>0x31</span>, <span class='number'>0xc7</span>,
<span class='number'>0x9d</span>, <span class='number'>0xb9</span>, <span class='number'>0xd4</span>, <span class='number'>0xf7</span>, <span class='number'>0xc7</span>, <span class='number'>0xa8</span>, <span class='number'>0x99</span>, <span class='number'>0x15</span>,
<span class='number'>0x1b</span>, <span class='number'>0x9a</span>, <span class='number'>0x47</span>, <span class='number'>0x50</span>, <span class='number'>0x32</span>, <span class='number'>0xb6</span>, <span class='number'>0x3f</span>, <span class='number'>0xc3</span>,
<span class='number'>0x85</span>, <span class='number'>0x24</span>, <span class='number'>0x5f</span>, <span class='number'>0xe0</span>, <span class='number'>0x54</span>, <span class='number'>0xe3</span>, <span class='number'>0xdd</span>, <span class='number'>0x5a</span>,
<span class='number'>0x97</span>, <span class='number'>0xa5</span>, <span class='number'>0xf5</span>, <span class='number'>0x76</span>, <span class='number'>0xfe</span>, <span class='number'>0x06</span>, <span class='number'>0x40</span>, <span class='number'>0x25</span>,
<span class='number'>0xd3</span>, <span class='number'>0xce</span>, <span class='number'>0x04</span>, <span class='number'>0x2c</span>, <span class='number'>0x56</span>, <span class='number'>0x6a</span>, <span class='number'>0xb2</span>, <span class='number'>0xc5</span>,
<span class='number'>0x07</span>, <span class='number'>0xb1</span>, <span class='number'>0x38</span>, <span class='number'>0xdb</span>, <span class='number'>0x85</span>, <span class='number'>0x3e</span>, <span class='number'>0x3d</span>, <span class='number'>0x69</span>,
<span class='number'>0x59</span>, <span class='number'>0x66</span>, <span class='number'>0x09</span>, <span class='number'>0x96</span>, <span class='number'>0x54</span>, <span class='number'>0x6c</span>, <span class='number'>0xc9</span>, <span class='number'>0xc4</span>,
<span class='number'>0xa6</span>, <span class='number'>0xea</span>, <span class='number'>0xfd</span>, <span class='number'>0xc7</span>, <span class='number'>0x77</span>, <span class='number'>0xc0</span>, <span class='number'>0x40</span>, <span class='number'>0xd7</span>,
<span class='number'>0x0e</span>, <span class='number'>0xaf</span>, <span class='number'>0x46</span>, <span class='number'>0xf7</span>, <span class='number'>0x6d</span>, <span class='number'>0xad</span>, <span class='number'>0x39</span>, <span class='number'>0x79</span>,
<span class='number'>0xe5</span>, <span class='number'>0xc5</span>, <span class='number'>0x36</span>, <span class='number'>0x0c</span>, <span class='number'>0x33</span>, <span class='number'>0x17</span>, <span class='number'>0x16</span>, <span class='number'>0x6a</span>,
<span class='number'>0x1c</span>, <span class='number'>0x89</span>, <span class='number'>0x4c</span>, <span class='number'>0x94</span>, <span class='number'>0xa3</span>, <span class='number'>0x71</span>, <span class='number'>0x87</span>, <span class='number'>0x6a</span>,
<span class='number'>0x94</span>, <span class='number'>0xdf</span>, <span class='number'>0x76</span>, <span class='number'>0x28</span>, <span class='number'>0xfe</span>, <span class='number'>0x4e</span>, <span class='number'>0xaa</span>, <span class='number'>0xf2</span>,
<span class='number'>0xcc</span>, <span class='number'>0xb2</span>, <span class='number'>0x7d</span>, <span class='number'>0x5a</span>, <span class='number'>0xaa</span>, <span class='number'>0xe0</span>, <span class='number'>0xad</span>, <span class='number'>0x7a</span>,
<span class='number'>0xd0</span>, <span class='number'>0xf9</span>, <span class='number'>0xd4</span>, <span class='number'>0xb6</span>, <span class='number'>0xad</span>, <span class='number'>0x3b</span>, <span class='number'>0x54</span>, <span class='number'>0x09</span>,
<span class='number'>0x87</span>, <span class='number'>0x46</span>, <span class='number'>0xd4</span>, <span class='number'>0x52</span>, <span class='number'>0x4d</span>, <span class='number'>0x38</span>, <span class='number'>0x40</span>, <span class='number'>0x7a</span>,
<span class='number'>0x6d</span>, <span class='number'>0xeb</span>, <span class='number'>0x3a</span>, <span class='number'>0xb7</span>, <span class='number'>0x8f</span>, <span class='number'>0xab</span>, <span class='number'>0x78</span>, <span class='number'>0xc9</span>,
),
},
);
<span class='kw'>for</span> <span class='ident'>tv</span> <span class='kw'>in</span> <span class='ident'>test_vectors</span>.<span class='ident'>iter</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span><span class='ident'>tv</span>.<span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>tv</span>.<span class='ident'>nonce</span>);
<span class='kw'>let</span> <span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>tv</span>.<span class='ident'>keystream</span>.<span class='ident'>len</span>()).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>input</span>.<span class='ident'>len</span>()).<span class='ident'>collect</span>();
<span class='ident'>c</span>.<span class='ident'>process</span>(<span class='kw-2'>&</span><span class='ident'>input</span>[..], <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>[..]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>output</span>, <span class='ident'>tv</span>.<span class='ident'>keystream</span>);
}
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_xchacha20_basic</span>() {
<span class='comment'>// There aren't any convenient test vectors for XChaCha/20,</span>
<span class='comment'>// so, a simple test case was generated using Andrew Moon's</span>
<span class='comment'>// chacha-opt library, with the key/nonce from test_salsa20_cryptopp().</span>
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span>
[<span class='number'>0x1b</span>, <span class='number'>0x27</span>, <span class='number'>0x55</span>, <span class='number'>0x64</span>, <span class='number'>0x73</span>, <span class='number'>0xe9</span>, <span class='number'>0x85</span>, <span class='number'>0xd4</span>,
<span class='number'>0x62</span>, <span class='number'>0xcd</span>, <span class='number'>0x51</span>, <span class='number'>0x19</span>, <span class='number'>0x7a</span>, <span class='number'>0x9a</span>, <span class='number'>0x46</span>, <span class='number'>0xc7</span>,
<span class='number'>0x60</span>, <span class='number'>0x09</span>, <span class='number'>0x54</span>, <span class='number'>0x9e</span>, <span class='number'>0xac</span>, <span class='number'>0x64</span>, <span class='number'>0x74</span>, <span class='number'>0xf2</span>,
<span class='number'>0x06</span>, <span class='number'>0xc4</span>, <span class='number'>0xee</span>, <span class='number'>0x08</span>, <span class='number'>0x44</span>, <span class='number'>0xf6</span>, <span class='number'>0x83</span>, <span class='number'>0x89</span>];
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span>
[<span class='number'>0x69</span>, <span class='number'>0x69</span>, <span class='number'>0x6e</span>, <span class='number'>0xe9</span>, <span class='number'>0x55</span>, <span class='number'>0xb6</span>, <span class='number'>0x2b</span>, <span class='number'>0x73</span>,
<span class='number'>0xcd</span>, <span class='number'>0x62</span>, <span class='number'>0xbd</span>, <span class='number'>0xa8</span>, <span class='number'>0x75</span>, <span class='number'>0xfc</span>, <span class='number'>0x73</span>, <span class='number'>0xd6</span>,
<span class='number'>0x82</span>, <span class='number'>0x19</span>, <span class='number'>0xe0</span>, <span class='number'>0x03</span>, <span class='number'>0x6b</span>, <span class='number'>0x7a</span>, <span class='number'>0x0b</span>, <span class='number'>0x37</span>];
<span class='kw'>let</span> <span class='ident'>input</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>139</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>stream</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>139</span>];
<span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span>
[<span class='number'>0x4f</span>, <span class='number'>0xeb</span>, <span class='number'>0xf2</span>, <span class='number'>0xfe</span>, <span class='number'>0x4b</span>, <span class='number'>0x35</span>, <span class='number'>0x9c</span>, <span class='number'>0x50</span>,
<span class='number'>0x8d</span>, <span class='number'>0xc5</span>, <span class='number'>0xe8</span>, <span class='number'>0xb5</span>, <span class='number'>0x98</span>, <span class='number'>0x0c</span>, <span class='number'>0x88</span>, <span class='number'>0xe3</span>,
<span class='number'>0x89</span>, <span class='number'>0x46</span>, <span class='number'>0xd8</span>, <span class='number'>0xf1</span>, <span class='number'>0x8f</span>, <span class='number'>0x31</span>, <span class='number'>0x34</span>, <span class='number'>0x65</span>,
<span class='number'>0xc8</span>, <span class='number'>0x62</span>, <span class='number'>0xa0</span>, <span class='number'>0x87</span>, <span class='number'>0x82</span>, <span class='number'>0x64</span>, <span class='number'>0x82</span>, <span class='number'>0x48</span>,
<span class='number'>0x01</span>, <span class='number'>0x8d</span>, <span class='number'>0xac</span>, <span class='number'>0xdc</span>, <span class='number'>0xb9</span>, <span class='number'>0x04</span>, <span class='number'>0x17</span>, <span class='number'>0x88</span>,
<span class='number'>0x53</span>, <span class='number'>0xa4</span>, <span class='number'>0x6d</span>, <span class='number'>0xca</span>, <span class='number'>0x3a</span>, <span class='number'>0x0e</span>, <span class='number'>0xaa</span>, <span class='number'>0xee</span>,
<span class='number'>0x74</span>, <span class='number'>0x7c</span>, <span class='number'>0xba</span>, <span class='number'>0x97</span>, <span class='number'>0x43</span>, <span class='number'>0x4e</span>, <span class='number'>0xaf</span>, <span class='number'>0xfa</span>,
<span class='number'>0xd5</span>, <span class='number'>0x8f</span>, <span class='number'>0xea</span>, <span class='number'>0x82</span>, <span class='number'>0x22</span>, <span class='number'>0x04</span>, <span class='number'>0x7e</span>, <span class='number'>0x0d</span>,
<span class='number'>0xe6</span>, <span class='number'>0xc3</span>, <span class='number'>0xa6</span>, <span class='number'>0x77</span>, <span class='number'>0x51</span>, <span class='number'>0x06</span>, <span class='number'>0xe0</span>, <span class='number'>0x33</span>,
<span class='number'>0x1a</span>, <span class='number'>0xd7</span>, <span class='number'>0x14</span>, <span class='number'>0xd2</span>, <span class='number'>0xf2</span>, <span class='number'>0x7a</span>, <span class='number'>0x55</span>, <span class='number'>0x64</span>,
<span class='number'>0x13</span>, <span class='number'>0x40</span>, <span class='number'>0xa1</span>, <span class='number'>0xf1</span>, <span class='number'>0xdd</span>, <span class='number'>0x9f</span>, <span class='number'>0x94</span>, <span class='number'>0x53</span>,
<span class='number'>0x2e</span>, <span class='number'>0x68</span>, <span class='number'>0xcb</span>, <span class='number'>0x24</span>, <span class='number'>0x1c</span>, <span class='number'>0xbd</span>, <span class='number'>0xd1</span>, <span class='number'>0x50</span>,
<span class='number'>0x97</span>, <span class='number'>0x0d</span>, <span class='number'>0x14</span>, <span class='number'>0xe0</span>, <span class='number'>0x5c</span>, <span class='number'>0x5b</span>, <span class='number'>0x17</span>, <span class='number'>0x31</span>,
<span class='number'>0x93</span>, <span class='number'>0xfb</span>, <span class='number'>0x14</span>, <span class='number'>0xf5</span>, <span class='number'>0x1c</span>, <span class='number'>0x41</span>, <span class='number'>0xf3</span>, <span class='number'>0x93</span>,
<span class='number'>0x83</span>, <span class='number'>0x5b</span>, <span class='number'>0xf7</span>, <span class='number'>0xf4</span>, <span class='number'>0x16</span>, <span class='number'>0xa7</span>, <span class='number'>0xe0</span>, <span class='number'>0xbb</span>,
<span class='number'>0xa8</span>, <span class='number'>0x1f</span>, <span class='number'>0xfb</span>, <span class='number'>0x8b</span>, <span class='number'>0x13</span>, <span class='number'>0xaf</span>, <span class='number'>0x0e</span>, <span class='number'>0x21</span>,
<span class='number'>0x69</span>, <span class='number'>0x1d</span>, <span class='number'>0x7e</span>, <span class='number'>0xce</span>, <span class='number'>0xc9</span>, <span class='number'>0x3b</span>, <span class='number'>0x75</span>, <span class='number'>0xe6</span>,
<span class='number'>0xe4</span>, <span class='number'>0x18</span>, <span class='number'>0x3a</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>xchacha20</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>::<span class='ident'>new_xchacha20</span>(<span class='kw-2'>&</span><span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>);
<span class='ident'>xchacha20</span>.<span class='ident'>process</span>(<span class='kw-2'>&</span><span class='ident'>input</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>stream</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>stream</span>[..] <span class='op'>==</span> <span class='ident'>result</span>[..]);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_chacha20_256_tls_vectors_96_nonce</span>() {
<span class='kw'>struct</span> <span class='ident'>TestVector</span> {
<span class='ident'>key</span>: [<span class='ident'>u8</span>; <span class='number'>32</span>],
<span class='ident'>nonce</span>: [<span class='ident'>u8</span>; <span class='number'>12</span>],
<span class='ident'>keystream</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>,
};
<span class='comment'>// taken from http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04</span>
<span class='kw'>let</span> <span class='ident'>test_vectors</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0x76</span>, <span class='number'>0xb8</span>, <span class='number'>0xe0</span>, <span class='number'>0xad</span>, <span class='number'>0xa0</span>, <span class='number'>0xf1</span>, <span class='number'>0x3d</span>, <span class='number'>0x90</span>,
<span class='number'>0x40</span>, <span class='number'>0x5d</span>, <span class='number'>0x6a</span>, <span class='number'>0xe5</span>, <span class='number'>0x53</span>, <span class='number'>0x86</span>, <span class='number'>0xbd</span>, <span class='number'>0x28</span>,
<span class='number'>0xbd</span>, <span class='number'>0xd2</span>, <span class='number'>0x19</span>, <span class='number'>0xb8</span>, <span class='number'>0xa0</span>, <span class='number'>0x8d</span>, <span class='number'>0xed</span>, <span class='number'>0x1a</span>,
<span class='number'>0xa8</span>, <span class='number'>0x36</span>, <span class='number'>0xef</span>, <span class='number'>0xcc</span>, <span class='number'>0x8b</span>, <span class='number'>0x77</span>, <span class='number'>0x0d</span>, <span class='number'>0xc7</span>,
<span class='number'>0xda</span>, <span class='number'>0x41</span>, <span class='number'>0x59</span>, <span class='number'>0x7c</span>, <span class='number'>0x51</span>, <span class='number'>0x57</span>, <span class='number'>0x48</span>, <span class='number'>0x8d</span>,
<span class='number'>0x77</span>, <span class='number'>0x24</span>, <span class='number'>0xe0</span>, <span class='number'>0x3f</span>, <span class='number'>0xb8</span>, <span class='number'>0xd8</span>, <span class='number'>0x4a</span>, <span class='number'>0x37</span>,
<span class='number'>0x6a</span>, <span class='number'>0x43</span>, <span class='number'>0xb8</span>, <span class='number'>0xf4</span>, <span class='number'>0x15</span>, <span class='number'>0x18</span>, <span class='number'>0xa1</span>, <span class='number'>0x1c</span>,
<span class='number'>0xc3</span>, <span class='number'>0x87</span>, <span class='number'>0xb6</span>, <span class='number'>0x69</span>, <span class='number'>0xb2</span>, <span class='number'>0xee</span>, <span class='number'>0x65</span>, <span class='number'>0x86</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x01</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0x45</span>, <span class='number'>0x40</span>, <span class='number'>0xf0</span>, <span class='number'>0x5a</span>, <span class='number'>0x9f</span>, <span class='number'>0x1f</span>, <span class='number'>0xb2</span>, <span class='number'>0x96</span>,
<span class='number'>0xd7</span>, <span class='number'>0x73</span>, <span class='number'>0x6e</span>, <span class='number'>0x7b</span>, <span class='number'>0x20</span>, <span class='number'>0x8e</span>, <span class='number'>0x3c</span>, <span class='number'>0x96</span>,
<span class='number'>0xeb</span>, <span class='number'>0x4f</span>, <span class='number'>0xe1</span>, <span class='number'>0x83</span>, <span class='number'>0x46</span>, <span class='number'>0x88</span>, <span class='number'>0xd2</span>, <span class='number'>0x60</span>,
<span class='number'>0x4f</span>, <span class='number'>0x45</span>, <span class='number'>0x09</span>, <span class='number'>0x52</span>, <span class='number'>0xed</span>, <span class='number'>0x43</span>, <span class='number'>0x2d</span>, <span class='number'>0x41</span>,
<span class='number'>0xbb</span>, <span class='number'>0xe2</span>, <span class='number'>0xa0</span>, <span class='number'>0xb6</span>, <span class='number'>0xea</span>, <span class='number'>0x75</span>, <span class='number'>0x66</span>, <span class='number'>0xd2</span>,
<span class='number'>0xa5</span>, <span class='number'>0xd1</span>, <span class='number'>0xe7</span>, <span class='number'>0xe2</span>, <span class='number'>0x0d</span>, <span class='number'>0x42</span>, <span class='number'>0xaf</span>, <span class='number'>0x2c</span>,
<span class='number'>0x53</span>, <span class='number'>0xd7</span>, <span class='number'>0x92</span>, <span class='number'>0xb1</span>, <span class='number'>0xc4</span>, <span class='number'>0x3f</span>, <span class='number'>0xea</span>, <span class='number'>0x81</span>,
<span class='number'>0x7e</span>, <span class='number'>0x9a</span>, <span class='number'>0xd2</span>, <span class='number'>0x75</span>, <span class='number'>0xae</span>, <span class='number'>0x54</span>, <span class='number'>0x69</span>, <span class='number'>0x63</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x01</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0xde</span>, <span class='number'>0x9c</span>, <span class='number'>0xba</span>, <span class='number'>0x7b</span>, <span class='number'>0xf3</span>, <span class='number'>0xd6</span>, <span class='number'>0x9e</span>, <span class='number'>0xf5</span>,
<span class='number'>0xe7</span>, <span class='number'>0x86</span>, <span class='number'>0xdc</span>, <span class='number'>0x63</span>, <span class='number'>0x97</span>, <span class='number'>0x3f</span>, <span class='number'>0x65</span>, <span class='number'>0x3a</span>,
<span class='number'>0x0b</span>, <span class='number'>0x49</span>, <span class='number'>0xe0</span>, <span class='number'>0x15</span>, <span class='number'>0xad</span>, <span class='number'>0xbf</span>, <span class='number'>0xf7</span>, <span class='number'>0x13</span>,
<span class='number'>0x4f</span>, <span class='number'>0xcb</span>, <span class='number'>0x7d</span>, <span class='number'>0xf1</span>, <span class='number'>0x37</span>, <span class='number'>0x82</span>, <span class='number'>0x10</span>, <span class='number'>0x31</span>,
<span class='number'>0xe8</span>, <span class='number'>0x5a</span>, <span class='number'>0x05</span>, <span class='number'>0x02</span>, <span class='number'>0x78</span>, <span class='number'>0xa7</span>, <span class='number'>0x08</span>, <span class='number'>0x45</span>,
<span class='number'>0x27</span>, <span class='number'>0x21</span>, <span class='number'>0x4f</span>, <span class='number'>0x73</span>, <span class='number'>0xef</span>, <span class='number'>0xc7</span>, <span class='number'>0xfa</span>, <span class='number'>0x5b</span>,
<span class='number'>0x52</span>, <span class='number'>0x77</span>, <span class='number'>0x06</span>, <span class='number'>0x2e</span>, <span class='number'>0xb7</span>, <span class='number'>0xa0</span>, <span class='number'>0x43</span>, <span class='number'>0x3e</span>,
<span class='number'>0x44</span>, <span class='number'>0x5f</span>, <span class='number'>0x41</span>, <span class='number'>0xe3</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>,
],
<span class='ident'>nonce</span>: [ <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x01</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0xef</span>, <span class='number'>0x3f</span>, <span class='number'>0xdf</span>, <span class='number'>0xd6</span>, <span class='number'>0xc6</span>, <span class='number'>0x15</span>, <span class='number'>0x78</span>, <span class='number'>0xfb</span>,
<span class='number'>0xf5</span>, <span class='number'>0xcf</span>, <span class='number'>0x35</span>, <span class='number'>0xbd</span>, <span class='number'>0x3d</span>, <span class='number'>0xd3</span>, <span class='number'>0x3b</span>, <span class='number'>0x80</span>,
<span class='number'>0x09</span>, <span class='number'>0x63</span>, <span class='number'>0x16</span>, <span class='number'>0x34</span>, <span class='number'>0xd2</span>, <span class='number'>0x1e</span>, <span class='number'>0x42</span>, <span class='number'>0xac</span>,
<span class='number'>0x33</span>, <span class='number'>0x96</span>, <span class='number'>0x0b</span>, <span class='number'>0xd1</span>, <span class='number'>0x38</span>, <span class='number'>0xe5</span>, <span class='number'>0x0d</span>, <span class='number'>0x32</span>,
<span class='number'>0x11</span>, <span class='number'>0x1e</span>, <span class='number'>0x4c</span>, <span class='number'>0xaf</span>, <span class='number'>0x23</span>, <span class='number'>0x7e</span>, <span class='number'>0xe5</span>, <span class='number'>0x3c</span>,
<span class='number'>0xa8</span>, <span class='number'>0xad</span>, <span class='number'>0x64</span>, <span class='number'>0x26</span>, <span class='number'>0x19</span>, <span class='number'>0x4a</span>, <span class='number'>0x88</span>, <span class='number'>0x54</span>,
<span class='number'>0x5d</span>, <span class='number'>0xdc</span>, <span class='number'>0x49</span>, <span class='number'>0x7a</span>, <span class='number'>0x0b</span>, <span class='number'>0x46</span>, <span class='number'>0x6e</span>, <span class='number'>0x7d</span>,
<span class='number'>0x6b</span>, <span class='number'>0xbd</span>, <span class='number'>0xb0</span>, <span class='number'>0x04</span>, <span class='number'>0x1b</span>, <span class='number'>0x2f</span>, <span class='number'>0x58</span>, <span class='number'>0x6b</span>,
),
}, <span class='ident'>TestVector</span>{
<span class='ident'>key</span>: [
<span class='number'>0x00</span>, <span class='number'>0x01</span>, <span class='number'>0x02</span>, <span class='number'>0x03</span>, <span class='number'>0x04</span>, <span class='number'>0x05</span>, <span class='number'>0x06</span>, <span class='number'>0x07</span>,
<span class='number'>0x08</span>, <span class='number'>0x09</span>, <span class='number'>0x0a</span>, <span class='number'>0x0b</span>, <span class='number'>0x0c</span>, <span class='number'>0x0d</span>, <span class='number'>0x0e</span>, <span class='number'>0x0f</span>,
<span class='number'>0x10</span>, <span class='number'>0x11</span>, <span class='number'>0x12</span>, <span class='number'>0x13</span>, <span class='number'>0x14</span>, <span class='number'>0x15</span>, <span class='number'>0x16</span>, <span class='number'>0x17</span>,
<span class='number'>0x18</span>, <span class='number'>0x19</span>, <span class='number'>0x1a</span>, <span class='number'>0x1b</span>, <span class='number'>0x1c</span>, <span class='number'>0x1d</span>, <span class='number'>0x1e</span>, <span class='number'>0x1f</span>,
],
<span class='ident'>nonce</span>: [<span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x00</span>, <span class='number'>0x01</span>, <span class='number'>0x02</span>, <span class='number'>0x03</span>, <span class='number'>0x04</span>, <span class='number'>0x05</span>, <span class='number'>0x06</span>, <span class='number'>0x07</span> ],
<span class='ident'>keystream</span>: <span class='macro'>vec</span><span class='macro'>!</span>(
<span class='number'>0xf7</span>, <span class='number'>0x98</span>, <span class='number'>0xa1</span>, <span class='number'>0x89</span>, <span class='number'>0xf1</span>, <span class='number'>0x95</span>, <span class='number'>0xe6</span>, <span class='number'>0x69</span>,
<span class='number'>0x82</span>, <span class='number'>0x10</span>, <span class='number'>0x5f</span>, <span class='number'>0xfb</span>, <span class='number'>0x64</span>, <span class='number'>0x0b</span>, <span class='number'>0xb7</span>, <span class='number'>0x75</span>,
<span class='number'>0x7f</span>, <span class='number'>0x57</span>, <span class='number'>0x9d</span>, <span class='number'>0xa3</span>, <span class='number'>0x16</span>, <span class='number'>0x02</span>, <span class='number'>0xfc</span>, <span class='number'>0x93</span>,
<span class='number'>0xec</span>, <span class='number'>0x01</span>, <span class='number'>0xac</span>, <span class='number'>0x56</span>, <span class='number'>0xf8</span>, <span class='number'>0x5a</span>, <span class='number'>0xc3</span>, <span class='number'>0xc1</span>,
<span class='number'>0x34</span>, <span class='number'>0xa4</span>, <span class='number'>0x54</span>, <span class='number'>0x7b</span>, <span class='number'>0x73</span>, <span class='number'>0x3b</span>, <span class='number'>0x46</span>, <span class='number'>0x41</span>,
<span class='number'>0x30</span>, <span class='number'>0x42</span>, <span class='number'>0xc9</span>, <span class='number'>0x44</span>, <span class='number'>0x00</span>, <span class='number'>0x49</span>, <span class='number'>0x17</span>, <span class='number'>0x69</span>,
<span class='number'>0x05</span>, <span class='number'>0xd3</span>, <span class='number'>0xbe</span>, <span class='number'>0x59</span>, <span class='number'>0xea</span>, <span class='number'>0x1c</span>, <span class='number'>0x53</span>, <span class='number'>0xf1</span>,
<span class='number'>0x59</span>, <span class='number'>0x16</span>, <span class='number'>0x15</span>, <span class='number'>0x5c</span>, <span class='number'>0x2b</span>, <span class='number'>0xe8</span>, <span class='number'>0x24</span>, <span class='number'>0x1a</span>,
<span class='number'>0x38</span>, <span class='number'>0x00</span>, <span class='number'>0x8b</span>, <span class='number'>0x9a</span>, <span class='number'>0x26</span>, <span class='number'>0xbc</span>, <span class='number'>0x35</span>, <span class='number'>0x94</span>,
<span class='number'>0x1e</span>, <span class='number'>0x24</span>, <span class='number'>0x44</span>, <span class='number'>0x17</span>, <span class='number'>0x7c</span>, <span class='number'>0x8a</span>, <span class='number'>0xde</span>, <span class='number'>0x66</span>,
<span class='number'>0x89</span>, <span class='number'>0xde</span>, <span class='number'>0x95</span>, <span class='number'>0x26</span>, <span class='number'>0x49</span>, <span class='number'>0x86</span>, <span class='number'>0xd9</span>, <span class='number'>0x58</span>,
<span class='number'>0x89</span>, <span class='number'>0xfb</span>, <span class='number'>0x60</span>, <span class='number'>0xe8</span>, <span class='number'>0x46</span>, <span class='number'>0x29</span>, <span class='number'>0xc9</span>, <span class='number'>0xbd</span>,
<span class='number'>0x9a</span>, <span class='number'>0x5a</span>, <span class='number'>0xcb</span>, <span class='number'>0x1c</span>, <span class='number'>0xc1</span>, <span class='number'>0x18</span>, <span class='number'>0xbe</span>, <span class='number'>0x56</span>,
<span class='number'>0x3e</span>, <span class='number'>0xb9</span>, <span class='number'>0xb3</span>, <span class='number'>0xa4</span>, <span class='number'>0xa4</span>, <span class='number'>0x72</span>, <span class='number'>0xf8</span>, <span class='number'>0x2e</span>,
<span class='number'>0x09</span>, <span class='number'>0xa7</span>, <span class='number'>0xe7</span>, <span class='number'>0x78</span>, <span class='number'>0x49</span>, <span class='number'>0x2b</span>, <span class='number'>0x56</span>, <span class='number'>0x2e</span>,
<span class='number'>0xf7</span>, <span class='number'>0x13</span>, <span class='number'>0x0e</span>, <span class='number'>0x88</span>, <span class='number'>0xdf</span>, <span class='number'>0xe0</span>, <span class='number'>0x31</span>, <span class='number'>0xc7</span>,
<span class='number'>0x9d</span>, <span class='number'>0xb9</span>, <span class='number'>0xd4</span>, <span class='number'>0xf7</span>, <span class='number'>0xc7</span>, <span class='number'>0xa8</span>, <span class='number'>0x99</span>, <span class='number'>0x15</span>,
<span class='number'>0x1b</span>, <span class='number'>0x9a</span>, <span class='number'>0x47</span>, <span class='number'>0x50</span>, <span class='number'>0x32</span>, <span class='number'>0xb6</span>, <span class='number'>0x3f</span>, <span class='number'>0xc3</span>,
<span class='number'>0x85</span>, <span class='number'>0x24</span>, <span class='number'>0x5f</span>, <span class='number'>0xe0</span>, <span class='number'>0x54</span>, <span class='number'>0xe3</span>, <span class='number'>0xdd</span>, <span class='number'>0x5a</span>,
<span class='number'>0x97</span>, <span class='number'>0xa5</span>, <span class='number'>0xf5</span>, <span class='number'>0x76</span>, <span class='number'>0xfe</span>, <span class='number'>0x06</span>, <span class='number'>0x40</span>, <span class='number'>0x25</span>,
<span class='number'>0xd3</span>, <span class='number'>0xce</span>, <span class='number'>0x04</span>, <span class='number'>0x2c</span>, <span class='number'>0x56</span>, <span class='number'>0x6a</span>, <span class='number'>0xb2</span>, <span class='number'>0xc5</span>,
<span class='number'>0x07</span>, <span class='number'>0xb1</span>, <span class='number'>0x38</span>, <span class='number'>0xdb</span>, <span class='number'>0x85</span>, <span class='number'>0x3e</span>, <span class='number'>0x3d</span>, <span class='number'>0x69</span>,
<span class='number'>0x59</span>, <span class='number'>0x66</span>, <span class='number'>0x09</span>, <span class='number'>0x96</span>, <span class='number'>0x54</span>, <span class='number'>0x6c</span>, <span class='number'>0xc9</span>, <span class='number'>0xc4</span>,
<span class='number'>0xa6</span>, <span class='number'>0xea</span>, <span class='number'>0xfd</span>, <span class='number'>0xc7</span>, <span class='number'>0x77</span>, <span class='number'>0xc0</span>, <span class='number'>0x40</span>, <span class='number'>0xd7</span>,
<span class='number'>0x0e</span>, <span class='number'>0xaf</span>, <span class='number'>0x46</span>, <span class='number'>0xf7</span>, <span class='number'>0x6d</span>, <span class='number'>0xad</span>, <span class='number'>0x39</span>, <span class='number'>0x79</span>,
<span class='number'>0xe5</span>, <span class='number'>0xc5</span>, <span class='number'>0x36</span>, <span class='number'>0x0c</span>, <span class='number'>0x33</span>, <span class='number'>0x17</span>, <span class='number'>0x16</span>, <span class='number'>0x6a</span>,
<span class='number'>0x1c</span>, <span class='number'>0x89</span>, <span class='number'>0x4c</span>, <span class='number'>0x94</span>, <span class='number'>0xa3</span>, <span class='number'>0x71</span>, <span class='number'>0x87</span>, <span class='number'>0x6a</span>,
<span class='number'>0x94</span>, <span class='number'>0xdf</span>, <span class='number'>0x76</span>, <span class='number'>0x28</span>, <span class='number'>0xfe</span>, <span class='number'>0x4e</span>, <span class='number'>0xaa</span>, <span class='number'>0xf2</span>,
<span class='number'>0xcc</span>, <span class='number'>0xb2</span>, <span class='number'>0x7d</span>, <span class='number'>0x5a</span>, <span class='number'>0xaa</span>, <span class='number'>0xe0</span>, <span class='number'>0xad</span>, <span class='number'>0x7a</span>,
<span class='number'>0xd0</span>, <span class='number'>0xf9</span>, <span class='number'>0xd4</span>, <span class='number'>0xb6</span>, <span class='number'>0xad</span>, <span class='number'>0x3b</span>, <span class='number'>0x54</span>, <span class='number'>0x09</span>,
<span class='number'>0x87</span>, <span class='number'>0x46</span>, <span class='number'>0xd4</span>, <span class='number'>0x52</span>, <span class='number'>0x4d</span>, <span class='number'>0x38</span>, <span class='number'>0x40</span>, <span class='number'>0x7a</span>,
<span class='number'>0x6d</span>, <span class='number'>0xeb</span>, <span class='number'>0x3a</span>, <span class='number'>0xb7</span>, <span class='number'>0x8f</span>, <span class='number'>0xab</span>, <span class='number'>0x78</span>, <span class='number'>0xc9</span>,
),
},
);
<span class='kw'>for</span> <span class='ident'>tv</span> <span class='kw'>in</span> <span class='ident'>test_vectors</span>.<span class='ident'>iter</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span><span class='ident'>tv</span>.<span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>tv</span>.<span class='ident'>nonce</span>);
<span class='kw'>let</span> <span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>tv</span>.<span class='ident'>keystream</span>.<span class='ident'>len</span>()).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>input</span>.<span class='ident'>len</span>()).<span class='ident'>collect</span>();
<span class='ident'>c</span>.<span class='ident'>process</span>(<span class='kw-2'>&</span><span class='ident'>input</span>[..], <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>[..]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>output</span>, <span class='ident'>tv</span>.<span class='ident'>keystream</span>);
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>test</span>, <span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"with-bench"</span>))]</span>
<span class='kw'>mod</span> <span class='ident'>bench</span> {
<span class='kw'>use</span> <span class='ident'>test</span>::<span class='ident'>Bencher</span>;
<span class='kw'>use</span> <span class='ident'>symmetriccipher</span>::<span class='ident'>SynchronousStreamCipher</span>;
<span class='kw'>use</span> <span class='ident'>chacha20</span>::<span class='ident'>ChaCha20</span>;
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>chacha20_10</span>(<span class='ident'>bh</span>: <span class='op'>&</span> <span class='kw-2'>mut</span> <span class='ident'>Bencher</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chacha20</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>32</span>], <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>8</span>]);
<span class='kw'>let</span> <span class='ident'>input</span> <span class='op'>=</span> [<span class='number'>1u8</span>; <span class='number'>10</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>10</span>];
<span class='ident'>bh</span>.<span class='ident'>iter</span>( <span class='op'>||</span> {
<span class='ident'>chacha20</span>.<span class='ident'>process</span>(<span class='kw-2'>&</span><span class='ident'>input</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
});
<span class='ident'>bh</span>.<span class='ident'>bytes</span> <span class='op'>=</span> <span class='ident'>input</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u64</span>;
}
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>chacha20_1k</span>(<span class='ident'>bh</span>: <span class='op'>&</span> <span class='kw-2'>mut</span> <span class='ident'>Bencher</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chacha20</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>32</span>], <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>8</span>]);
<span class='kw'>let</span> <span class='ident'>input</span> <span class='op'>=</span> [<span class='number'>1u8</span>; <span class='number'>1024</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>1024</span>];
<span class='ident'>bh</span>.<span class='ident'>iter</span>( <span class='op'>||</span> {
<span class='ident'>chacha20</span>.<span class='ident'>process</span>(<span class='kw-2'>&</span><span class='ident'>input</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
});
<span class='ident'>bh</span>.<span class='ident'>bytes</span> <span class='op'>=</span> <span class='ident'>input</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u64</span>;
}
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>chacha20_64k</span>(<span class='ident'>bh</span>: <span class='op'>&</span> <span class='kw-2'>mut</span> <span class='ident'>Bencher</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chacha20</span> <span class='op'>=</span> <span class='ident'>ChaCha20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>32</span>], <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>8</span>]);
<span class='kw'>let</span> <span class='ident'>input</span> <span class='op'>=</span> [<span class='number'>1u8</span>; <span class='number'>65536</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>65536</span>];
<span class='ident'>bh</span>.<span class='ident'>iter</span>( <span class='op'>||</span> {
<span class='ident'>chacha20</span>.<span class='ident'>process</span>(<span class='kw-2'>&</span><span class='ident'>input</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
});
<span class='ident'>bh</span>.<span class='ident'>bytes</span> <span class='op'>=</span> <span class='ident'>input</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u64</span>;
}
}
</pre>
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