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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'>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='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</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'>SalsaState</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'>Salsa20</span> {
<span class='ident'>state</span>: <span class='ident'>SalsaState</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'>Salsa20</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'>Salsa20</span> { <span class='kw-2'>*</span><span class='self'>self</span> } }
<span class='kw'>const</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'>const</span> <span class='ident'>S9</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>9</span>, <span class='number'>9</span>, <span class='number'>9</span>, <span class='number'>9</span>);
<span class='kw'>const</span> <span class='ident'>S13</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>13</span>, <span class='number'>13</span>, <span class='number'>13</span>, <span class='number'>13</span>);
<span class='kw'>const</span> <span class='ident'>S18</span>:<span class='ident'>u32x4</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='number'>18</span>, <span class='number'>18</span>, <span class='number'>18</span>, <span class='number'>18</span>);
<span class='kw'>const</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='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>prepare_rowround</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'>$</span><span class='macro-nonterminal'>c</span>: <span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>a10</span>, <span class='ident'>a11</span>, <span class='ident'>a12</span>, <span class='ident'>a13</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>a13</span>, <span class='ident'>a10</span>, <span class='ident'>a11</span>, <span class='ident'>a12</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>b10</span>, <span class='ident'>b11</span>, <span class='ident'>b12</span>, <span class='ident'>b13</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>b12</span>, <span class='ident'>b13</span>, <span class='ident'>b10</span>, <span class='ident'>b11</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>c10</span>, <span class='ident'>c11</span>, <span class='ident'>c12</span>, <span class='ident'>c13</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>c11</span>, <span class='ident'>c12</span>, <span class='ident'>c13</span>, <span class='ident'>c10</span>);
}}
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>prepare_columnround</span> {
(<span class='macro-nonterminal'>$</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'>u32x4</span>(<span class='ident'>a13</span>, <span class='ident'>a10</span>, <span class='ident'>a11</span>, <span class='ident'>a12</span>) <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span> <span class='op'>=</span> <span class='ident'>u32x4</span>(<span class='ident'>a10</span>, <span class='ident'>a11</span>, <span class='ident'>a12</span>, <span class='ident'>a13</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>b12</span>, <span class='ident'>b13</span>, <span class='ident'>b10</span>, <span class='ident'>b11</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'>b10</span>, <span class='ident'>b11</span>, <span class='ident'>b12</span>, <span class='ident'>b13</span>);
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>c11</span>, <span class='ident'>c12</span>, <span class='ident'>c13</span>, <span class='ident'>c10</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'>c10</span>, <span class='ident'>c11</span>, <span class='ident'>c12</span>, <span class='ident'>c13</span>);
}}
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>add_rotate_xor</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>dst</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</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'>shift</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'>$</span><span class='macro-nonterminal'>shift</span>;
<span class='kw'>let</span> <span class='ident'>right</span> <span class='op'>=</span> <span class='ident'>v</span> <span class='op'>>></span> <span class='ident'>r</span>;
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>dst</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>dst</span> <span class='op'>^</span> (<span class='ident'>v</span> <span class='op'><<</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>) <span class='op'>^</span> <span class='ident'>right</span>
}}
}
<span class='kw'>fn</span> <span class='ident'>columnround</span>(<span class='ident'>state</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>SalsaState</span>) <span class='op'>-></span> () {
<span class='macro'>add_rotate_xor</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>d</span>, <span class='ident'>state</span>.<span class='ident'>c</span>, <span class='ident'>S7</span>);
<span class='macro'>add_rotate_xor</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>d</span>, <span class='ident'>S9</span>);
<span class='macro'>add_rotate_xor</span><span class='macro'>!</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='ident'>S13</span>);
<span class='macro'>add_rotate_xor</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'>S18</span>);
}
<span class='kw'>fn</span> <span class='ident'>rowround</span>(<span class='ident'>state</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>SalsaState</span>) <span class='op'>-></span> () {
<span class='macro'>add_rotate_xor</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>c</span>, <span class='ident'>state</span>.<span class='ident'>d</span>, <span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>S7</span>);
<span class='macro'>add_rotate_xor</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='ident'>S9</span>);
<span class='macro'>add_rotate_xor</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>c</span>, <span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>S13</span>);
<span class='macro'>add_rotate_xor</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>d</span>, <span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>S18</span>);
}
<span class='kw'>impl</span> <span class='ident'>Salsa20</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'>Salsa20</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='ident'>Salsa20</span> { <span class='ident'>state</span>: <span class='ident'>Salsa20</span>::<span class='ident'>expand</span>(<span class='ident'>key</span>, <span class='ident'>nonce</span>), <span class='ident'>output</span>: [<span class='number'>0</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_xsalsa20</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'>Salsa20</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='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>xsalsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</span> { <span class='ident'>state</span>: <span class='ident'>Salsa20</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'>0</span>; <span class='number'>64</span>], <span class='ident'>offset</span>: <span class='number'>64</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'>xsalsa20</span>.<span class='ident'>hsalsa20_hash</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>new_key</span>);
<span class='ident'>xsalsa20</span>.<span class='ident'>state</span> <span class='op'>=</span> <span class='ident'>Salsa20</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'>xsalsa20</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'>SalsaState</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='comment'>// The state vectors are laid out to facilitate SIMD operation,</span>
<span class='comment'>// instead of the natural matrix ordering.</span>
<span class='comment'>//</span>
<span class='comment'>// * Constant (x0, x5, x10, x15)</span>
<span class='comment'>// * Key (x1, x2, x3, x4, x11, x12, x13, x14)</span>
<span class='comment'>// * Input (x6, x7, x8, x9)</span>
<span class='kw'>let</span> <span class='ident'>key_tail</span>; <span class='comment'>// (x11, x12, x13, x14)</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'>key_tail</span> <span class='op'>=</span> <span class='ident'>key</span>;
} <span class='kw'>else</span> {
<span class='ident'>key_tail</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='ident'>key</span>[<span class='number'>16</span>..<span class='number'>32</span>];
}
<span class='kw'>let</span> <span class='ident'>x8</span>; <span class='kw'>let</span> <span class='ident'>x9</span>; <span class='comment'>// (x8, x9)</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='comment'>// HSalsa uses the full 16 byte nonce.</span>
<span class='ident'>x8</span> <span class='op'>=</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'>x9</span> <span class='op'>=</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='ident'>x8</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='ident'>x9</span> <span class='op'>=</span> <span class='number'>0</span>;
}
<span class='ident'>SalsaState</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'>key</span>[<span class='number'>12</span>..<span class='number'>16</span>]), <span class='comment'>// x4</span>
<span class='ident'>x9</span>, <span class='comment'>// x9</span>
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key_tail</span>[<span class='number'>12</span>..<span class='number'>16</span>]), <span class='comment'>// x14</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='comment'>// x3</span>
),
<span class='ident'>b</span>: <span class='ident'>u32x4</span>(
<span class='ident'>x8</span>, <span class='comment'>// x8</span>
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key_tail</span>[<span class='number'>8</span>..<span class='number'>12</span>]), <span class='comment'>// x13</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='comment'>// x2</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='comment'>// x7</span>
),
<span class='ident'>c</span>: <span class='ident'>u32x4</span>(
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key_tail</span>[<span class='number'>4</span>..<span class='number'>8</span>]), <span class='comment'>// x12</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='comment'>// x1</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='comment'>// x6</span>
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>key_tail</span>[<span class='number'>0</span>..<span class='number'>4</span>]) <span class='comment'>// x11</span>
),
<span class='ident'>d</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='comment'>// x0</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='comment'>// x5</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='comment'>// x10</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='comment'>// x15</span>
)
}
}
<span class='kw'>fn</span> <span class='ident'>hash</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='ident'>columnround</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>state</span>);
<span class='macro'>prepare_rowround</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>state</span>.<span class='ident'>c</span>);
<span class='ident'>rowround</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>state</span>);
<span class='macro'>prepare_columnround</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>state</span>.<span class='ident'>c</span>);
}
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>x4</span>, <span class='ident'>x9</span>, <span class='ident'>x14</span>, <span class='ident'>x3</span>) <span class='op'>=</span> <span class='self'>self</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='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>x8</span>, <span class='ident'>x13</span>, <span class='ident'>x2</span>, <span class='ident'>x7</span>) <span class='op'>=</span> <span class='self'>self</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='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>x12</span>, <span class='ident'>x1</span>, <span class='ident'>x6</span>, <span class='ident'>x11</span>) <span class='op'>=</span> <span class='self'>self</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='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>x0</span>, <span class='ident'>x5</span>, <span class='ident'>x10</span>, <span class='ident'>x15</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'>state</span>.<span class='ident'>d</span>;
<span class='kw'>let</span> <span class='ident'>lens</span> <span class='op'>=</span> [
<span class='ident'>x0</span>, <span class='ident'>x1</span>, <span class='ident'>x2</span>, <span class='ident'>x3</span>,
<span class='ident'>x4</span>, <span class='ident'>x5</span>, <span class='ident'>x6</span>, <span class='ident'>x7</span>,
<span class='ident'>x8</span>, <span class='ident'>x9</span>, <span class='ident'>x10</span>, <span class='ident'>x11</span>,
<span class='ident'>x12</span>, <span class='ident'>x13</span>, <span class='ident'>x14</span>, <span class='ident'>x15</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='self'>self</span>.<span class='ident'>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='self'>self</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='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'>ctr_lo</span>) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>b</span>;
<span class='kw'>if</span> <span class='ident'>ctr_lo</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='self'>self</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='op'>+</span> <span class='ident'>u32x4</span>(<span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>0</span>, <span class='number'>0</span>);
}
<span class='self'>self</span>.<span class='ident'>offset</span> <span class='op'>=</span> <span class='number'>0</span>;
}
<span class='kw'>fn</span> <span class='ident'>hsalsa20_hash</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='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='ident'>columnround</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>state</span>);
<span class='macro'>prepare_rowround</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>state</span>.<span class='ident'>c</span>);
<span class='ident'>rowround</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>state</span>);
<span class='macro'>prepare_columnround</span><span class='macro'>!</span>(<span class='ident'>state</span>.<span class='ident'>a</span>, <span class='ident'>state</span>.<span class='ident'>b</span>, <span class='ident'>state</span>.<span class='ident'>c</span>);
}
<span class='kw'>let</span> <span class='ident'>u32x4</span>(_, <span class='ident'>x9</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'>x8</span>, _, _, <span class='ident'>x7</span>) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>b</span>;
<span class='kw'>let</span> <span class='ident'>u32x4</span>(_, _, <span class='ident'>x6</span>, _) <span class='op'>=</span> <span class='ident'>state</span>.<span class='ident'>c</span>;
<span class='kw'>let</span> <span class='ident'>u32x4</span>(<span class='ident'>x0</span>, <span class='ident'>x5</span>, <span class='ident'>x10</span>, <span class='ident'>x15</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'>x0</span>, <span class='ident'>x5</span>, <span class='ident'>x10</span>, <span class='ident'>x15</span>,
<span class='ident'>x6</span>, <span class='ident'>x7</span>, <span class='ident'>x8</span>, <span class='ident'>x9</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='kw'>impl</span> <span class='ident'>SynchronousStreamCipher</span> <span class='kw'>for</span> <span class='ident'>Salsa20</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'>hash</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'>Salsa20</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'>Salsa20</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='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>hsalsa20</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='ident'>out</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'>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'>16</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>h</span> <span class='op'>=</span> <span class='ident'>Salsa20</span> { <span class='ident'>state</span>: <span class='ident'>Salsa20</span>::<span class='ident'>expand</span>(<span class='ident'>key</span>, <span class='ident'>nonce</span>), <span class='ident'>output</span>: [<span class='number'>0</span>; <span class='number'>64</span>], <span class='ident'>offset</span>: <span class='number'>64</span> };
<span class='ident'>h</span>.<span class='ident'>hsalsa20_hash</span>(<span class='ident'>out</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'>salsa20</span>::<span class='ident'>Salsa20</span>;
<span class='kw'>use</span> <span class='ident'>symmetriccipher</span>::<span class='ident'>SynchronousStreamCipher</span>;
<span class='kw'>use</span> <span class='ident'>digest</span>::<span class='ident'>Digest</span>;
<span class='kw'>use</span> <span class='ident'>sha2</span>::<span class='ident'>Sha256</span>;
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_salsa20_128bit_ecrypt_set_1_vector_0</span>() {
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> [<span class='number'>128u8</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>];
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>8</span>];
<span class='kw'>let</span> <span class='ident'>input</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>64</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'>64</span>];
<span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span>
[<span class='number'>0x4D</span>, <span class='number'>0xFA</span>, <span class='number'>0x5E</span>, <span class='number'>0x48</span>, <span class='number'>0x1D</span>, <span class='number'>0xA2</span>, <span class='number'>0x3E</span>, <span class='number'>0xA0</span>,
<span class='number'>0x9A</span>, <span class='number'>0x31</span>, <span class='number'>0x02</span>, <span class='number'>0x20</span>, <span class='number'>0x50</span>, <span class='number'>0x85</span>, <span class='number'>0x99</span>, <span class='number'>0x36</span>,
<span class='number'>0xDA</span>, <span class='number'>0x52</span>, <span class='number'>0xFC</span>, <span class='number'>0xEE</span>, <span class='number'>0x21</span>, <span class='number'>0x80</span>, <span class='number'>0x05</span>, <span class='number'>0x16</span>,
<span class='number'>0x4F</span>, <span class='number'>0x26</span>, <span class='number'>0x7C</span>, <span class='number'>0xB6</span>, <span class='number'>0x5F</span>, <span class='number'>0x5C</span>, <span class='number'>0xFD</span>, <span class='number'>0x7F</span>,
<span class='number'>0x2B</span>, <span class='number'>0x4F</span>, <span class='number'>0x97</span>, <span class='number'>0xE0</span>, <span class='number'>0xFF</span>, <span class='number'>0x16</span>, <span class='number'>0x92</span>, <span class='number'>0x4A</span>,
<span class='number'>0x52</span>, <span class='number'>0xDF</span>, <span class='number'>0x26</span>, <span class='number'>0x95</span>, <span class='number'>0x15</span>, <span class='number'>0x11</span>, <span class='number'>0x0A</span>, <span class='number'>0x07</span>,
<span class='number'>0xF9</span>, <span class='number'>0xE4</span>, <span class='number'>0x60</span>, <span class='number'>0xBC</span>, <span class='number'>0x65</span>, <span class='number'>0xEF</span>, <span class='number'>0x95</span>, <span class='number'>0xDA</span>,
<span class='number'>0x58</span>, <span class='number'>0xF7</span>, <span class='number'>0x40</span>, <span class='number'>0xB7</span>, <span class='number'>0xD1</span>, <span class='number'>0xDB</span>, <span class='number'>0xB0</span>, <span class='number'>0xAA</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>salsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span><span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>);
<span class='ident'>salsa20</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_salsa20_256bit_ecrypt_set_1_vector_0</span>() {
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span>
[<span class='number'>128u8</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>,
<span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>];
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>8</span>];
<span class='kw'>let</span> <span class='ident'>input</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>64</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'>64</span>];
<span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span>
[<span class='number'>0xE3</span>, <span class='number'>0xBE</span>, <span class='number'>0x8F</span>, <span class='number'>0xDD</span>, <span class='number'>0x8B</span>, <span class='number'>0xEC</span>, <span class='number'>0xA2</span>, <span class='number'>0xE3</span>,
<span class='number'>0xEA</span>, <span class='number'>0x8E</span>, <span class='number'>0xF9</span>, <span class='number'>0x47</span>, <span class='number'>0x5B</span>, <span class='number'>0x29</span>, <span class='number'>0xA6</span>, <span class='number'>0xE7</span>,
<span class='number'>0x00</span>, <span class='number'>0x39</span>, <span class='number'>0x51</span>, <span class='number'>0xE1</span>, <span class='number'>0x09</span>, <span class='number'>0x7A</span>, <span class='number'>0x5C</span>, <span class='number'>0x38</span>,
<span class='number'>0xD2</span>, <span class='number'>0x3B</span>, <span class='number'>0x7A</span>, <span class='number'>0x5F</span>, <span class='number'>0xAD</span>, <span class='number'>0x9F</span>, <span class='number'>0x68</span>, <span class='number'>0x44</span>,
<span class='number'>0xB2</span>, <span class='number'>0x2C</span>, <span class='number'>0x97</span>, <span class='number'>0x55</span>, <span class='number'>0x9E</span>, <span class='number'>0x27</span>, <span class='number'>0x23</span>, <span class='number'>0xC7</span>,
<span class='number'>0xCB</span>, <span class='number'>0xBD</span>, <span class='number'>0x3F</span>, <span class='number'>0xE4</span>, <span class='number'>0xFC</span>, <span class='number'>0x8D</span>, <span class='number'>0x9A</span>, <span class='number'>0x07</span>,
<span class='number'>0x44</span>, <span class='number'>0x65</span>, <span class='number'>0x2A</span>, <span class='number'>0x83</span>, <span class='number'>0xE7</span>, <span class='number'>0x2A</span>, <span class='number'>0x9C</span>, <span class='number'>0x46</span>,
<span class='number'>0x18</span>, <span class='number'>0x76</span>, <span class='number'>0xAF</span>, <span class='number'>0x4D</span>, <span class='number'>0x7E</span>, <span class='number'>0xF1</span>, <span class='number'>0xA1</span>, <span class='number'>0x17</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>salsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span><span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>);
<span class='ident'>salsa20</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_salsa20_256bit_nacl_vector_2</span>() {
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> [
<span class='number'>0xdc</span>,<span class='number'>0x90</span>,<span class='number'>0x8d</span>,<span class='number'>0xda</span>,<span class='number'>0x0b</span>,<span class='number'>0x93</span>,<span class='number'>0x44</span>,<span class='number'>0xa9</span>,
<span class='number'>0x53</span>,<span class='number'>0x62</span>,<span class='number'>0x9b</span>,<span class='number'>0x73</span>,<span class='number'>0x38</span>,<span class='number'>0x20</span>,<span class='number'>0x77</span>,<span class='number'>0x88</span>,
<span class='number'>0x80</span>,<span class='number'>0xf3</span>,<span class='number'>0xce</span>,<span class='number'>0xb4</span>,<span class='number'>0x21</span>,<span class='number'>0xbb</span>,<span class='number'>0x61</span>,<span class='number'>0xb9</span>,
<span class='number'>0x1c</span>,<span class='number'>0xbd</span>,<span class='number'>0x4c</span>,<span class='number'>0x3e</span>,<span class='number'>0x66</span>,<span class='number'>0x25</span>,<span class='number'>0x6c</span>,<span class='number'>0xe4</span>
];
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</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='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='number'>4194304</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>stream</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='kw'>let</span> <span class='ident'>output_str</span> <span class='op'>=</span> <span class='string'>"662b9d0e3463029156069b12f918691a98f7dfb2ca0393c96bbfc6b1fbd630a2"</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>salsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span><span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>);
<span class='ident'>salsa20</span>.<span class='ident'>process</span>(<span class='ident'>input</span>.<span class='ident'>as_ref</span>(), <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>stream</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>sh</span> <span class='op'>=</span> <span class='ident'>Sha256</span>::<span class='ident'>new</span>();
<span class='ident'>sh</span>.<span class='ident'>input</span>(<span class='ident'>stream</span>.<span class='ident'>as_ref</span>());
<span class='kw'>let</span> <span class='ident'>out_str</span> <span class='op'>=</span> <span class='ident'>sh</span>.<span class='ident'>result_str</span>();
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>out_str</span>[..] <span class='op'>==</span> <span class='ident'>output_str</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_xsalsa20_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'>0xee</span>, <span class='number'>0xa6</span>, <span class='number'>0xa7</span>, <span class='number'>0x25</span>, <span class='number'>0x1c</span>, <span class='number'>0x1e</span>, <span class='number'>0x72</span>, <span class='number'>0x91</span>,
<span class='number'>0x6d</span>, <span class='number'>0x11</span>, <span class='number'>0xc2</span>, <span class='number'>0xcb</span>, <span class='number'>0x21</span>, <span class='number'>0x4d</span>, <span class='number'>0x3c</span>, <span class='number'>0x25</span>,
<span class='number'>0x25</span>, <span class='number'>0x39</span>, <span class='number'>0x12</span>, <span class='number'>0x1d</span>, <span class='number'>0x8e</span>, <span class='number'>0x23</span>, <span class='number'>0x4e</span>, <span class='number'>0x65</span>,
<span class='number'>0x2d</span>, <span class='number'>0x65</span>, <span class='number'>0x1f</span>, <span class='number'>0xa4</span>, <span class='number'>0xc8</span>, <span class='number'>0xcf</span>, <span class='number'>0xf8</span>, <span class='number'>0x80</span>,
<span class='number'>0x30</span>, <span class='number'>0x9e</span>, <span class='number'>0x64</span>, <span class='number'>0x5a</span>, <span class='number'>0x74</span>, <span class='number'>0xe9</span>, <span class='number'>0xe0</span>, <span class='number'>0xa6</span>,
<span class='number'>0x0d</span>, <span class='number'>0x82</span>, <span class='number'>0x43</span>, <span class='number'>0xac</span>, <span class='number'>0xd9</span>, <span class='number'>0x17</span>, <span class='number'>0x7a</span>, <span class='number'>0xb5</span>,
<span class='number'>0x1a</span>, <span class='number'>0x1b</span>, <span class='number'>0xeb</span>, <span class='number'>0x8d</span>, <span class='number'>0x5a</span>, <span class='number'>0x2f</span>, <span class='number'>0x5d</span>, <span class='number'>0x70</span>,
<span class='number'>0x0c</span>, <span class='number'>0x09</span>, <span class='number'>0x3c</span>, <span class='number'>0x5e</span>, <span class='number'>0x55</span>, <span class='number'>0x85</span>, <span class='number'>0x57</span>, <span class='number'>0x96</span>,
<span class='number'>0x25</span>, <span class='number'>0x33</span>, <span class='number'>0x7b</span>, <span class='number'>0xd3</span>, <span class='number'>0xab</span>, <span class='number'>0x61</span>, <span class='number'>0x9d</span>, <span class='number'>0x61</span>,
<span class='number'>0x57</span>, <span class='number'>0x60</span>, <span class='number'>0xd8</span>, <span class='number'>0xc5</span>, <span class='number'>0xb2</span>, <span class='number'>0x24</span>, <span class='number'>0xa8</span>, <span class='number'>0x5b</span>,
<span class='number'>0x1d</span>, <span class='number'>0x0e</span>, <span class='number'>0xfe</span>, <span class='number'>0x0e</span>, <span class='number'>0xb8</span>, <span class='number'>0xa7</span>, <span class='number'>0xee</span>, <span class='number'>0x16</span>,
<span class='number'>0x3a</span>, <span class='number'>0xbb</span>, <span class='number'>0x03</span>, <span class='number'>0x76</span>, <span class='number'>0x52</span>, <span class='number'>0x9f</span>, <span class='number'>0xcc</span>, <span class='number'>0x09</span>,
<span class='number'>0xba</span>, <span class='number'>0xb5</span>, <span class='number'>0x06</span>, <span class='number'>0xc6</span>, <span class='number'>0x18</span>, <span class='number'>0xe1</span>, <span class='number'>0x3c</span>, <span class='number'>0xe7</span>,
<span class='number'>0x77</span>, <span class='number'>0xd8</span>, <span class='number'>0x2c</span>, <span class='number'>0x3a</span>, <span class='number'>0xe9</span>, <span class='number'>0xd1</span>, <span class='number'>0xa6</span>, <span class='number'>0xf9</span>,
<span class='number'>0x72</span>, <span class='number'>0xd4</span>, <span class='number'>0x16</span>, <span class='number'>0x02</span>, <span class='number'>0x87</span>, <span class='number'>0xcb</span>, <span class='number'>0xfe</span>, <span class='number'>0x60</span>,
<span class='number'>0xbf</span>, <span class='number'>0x21</span>, <span class='number'>0x30</span>, <span class='number'>0xfc</span>, <span class='number'>0x0a</span>, <span class='number'>0x6f</span>, <span class='number'>0xf6</span>, <span class='number'>0x04</span>,
<span class='number'>0x9d</span>, <span class='number'>0x0a</span>, <span class='number'>0x5c</span>, <span class='number'>0x8a</span>, <span class='number'>0x82</span>, <span class='number'>0xf4</span>, <span class='number'>0x29</span>, <span class='number'>0x23</span>,
<span class='number'>0x1f</span>, <span class='number'>0x00</span>, <span class='number'>0x80</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>xsalsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</span>::<span class='ident'>new_xsalsa20</span>(<span class='kw-2'>&</span><span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>);
<span class='ident'>xsalsa20</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'>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'>salsa20</span>::<span class='ident'>Salsa20</span>;
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>salsa20_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'>salsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</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'>salsa20</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'>salsa20_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'>salsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</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'>salsa20</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'>salsa20_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'>salsa20</span> <span class='op'>=</span> <span class='ident'>Salsa20</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'>salsa20</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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