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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='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ptr</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'>Hc128</span> {
<span class='ident'>p</span>: [<span class='ident'>u32</span>; <span class='number'>512</span>],
<span class='ident'>q</span>: [<span class='ident'>u32</span>; <span class='number'>512</span>],
<span class='ident'>cnt</span>: <span class='ident'>usize</span>,
<span class='ident'>output</span>: [<span class='ident'>u8</span>; <span class='number'>4</span>],
<span class='ident'>output_index</span>: <span class='ident'>usize</span>
}
<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>Hc128</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'>Hc128</span> { <span class='kw-2'>*</span><span class='self'>self</span> } }
<span class='kw'>impl</span> <span class='ident'>Hc128</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'>Hc128</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='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'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</span> { <span class='ident'>p</span>: [<span class='number'>0</span>; <span class='number'>512</span>], <span class='ident'>q</span>: [<span class='number'>0</span>; <span class='number'>512</span>], <span class='ident'>cnt</span>: <span class='number'>0</span>, <span class='ident'>output</span>: [<span class='number'>0</span>; <span class='number'>4</span>], <span class='ident'>output_index</span>: <span class='number'>0</span> };
<span class='ident'>hc128</span>.<span class='ident'>init</span>(<span class='kw-2'>&</span><span class='ident'>key</span>, <span class='kw-2'>&</span><span class='ident'>nonce</span>);
<span class='ident'>hc128</span>
}
<span class='kw'>fn</span> <span class='ident'>init</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</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='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>w</span> : [<span class='ident'>u32</span>; <span class='number'>1280</span>] <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>1280</span>];
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>16</span> {
<span class='ident'>w</span>[<span class='ident'>i</span> <span class='op'>>></span> <span class='number'>2</span>] <span class='op'>|=</span> (<span class='ident'>key</span>[<span class='ident'>i</span>] <span class='kw'>as</span> <span class='ident'>u32</span>) <span class='op'><<</span> (<span class='number'>8</span> <span class='op'>*</span> (<span class='ident'>i</span> <span class='op'>&</span> <span class='number'>0x3</span>));
}
<span class='kw'>unsafe</span> {
<span class='ident'>ptr</span>::<span class='ident'>copy_nonoverlapping</span>(<span class='ident'>w</span>.<span class='ident'>as_ptr</span>(), <span class='ident'>w</span>.<span class='ident'>as_mut_ptr</span>().<span class='ident'>offset</span>(<span class='number'>4</span>), <span class='number'>4</span>);
}
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='ident'>nonce</span>.<span class='ident'>len</span>() <span class='op'>&</span> <span class='number'>16</span> {
<span class='ident'>w</span>[(<span class='ident'>i</span> <span class='op'>>></span> <span class='number'>2</span>) <span class='op'>+</span> <span class='number'>8</span>] <span class='op'>|=</span> (<span class='ident'>nonce</span>[<span class='ident'>i</span>] <span class='kw'>as</span> <span class='ident'>u32</span>) <span class='op'><<</span> (<span class='number'>8</span> <span class='op'>*</span> (<span class='ident'>i</span> <span class='op'>&</span> <span class='number'>0x3</span>));
}
<span class='kw'>unsafe</span> {
<span class='ident'>ptr</span>::<span class='ident'>copy_nonoverlapping</span>(<span class='ident'>w</span>.<span class='ident'>as_ptr</span>().<span class='ident'>offset</span>(<span class='number'>8</span>), <span class='ident'>w</span>.<span class='ident'>as_mut_ptr</span>().<span class='ident'>offset</span>(<span class='number'>12</span>), <span class='number'>4</span>);
}
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>16</span>..<span class='number'>1280</span> {
<span class='ident'>w</span>[<span class='ident'>i</span>] <span class='op'>=</span> <span class='ident'>f2</span>(<span class='ident'>w</span>[<span class='ident'>i</span> <span class='op'>-</span> <span class='number'>2</span>]).<span class='ident'>wrapping_add</span>(<span class='ident'>w</span>[<span class='ident'>i</span> <span class='op'>-</span> <span class='number'>7</span>]).<span class='ident'>wrapping_add</span>(<span class='ident'>f1</span>(<span class='ident'>w</span>[<span class='ident'>i</span> <span class='op'>-</span> <span class='number'>15</span>])).<span class='ident'>wrapping_add</span>(<span class='ident'>w</span>[<span class='ident'>i</span> <span class='op'>-</span> <span class='number'>16</span>]).<span class='ident'>wrapping_add</span>(<span class='ident'>i</span> <span class='kw'>as</span> <span class='ident'>u32</span>);
}
<span class='comment'>// Copy contents of w into p and q</span>
<span class='kw'>unsafe</span> {
<span class='ident'>ptr</span>::<span class='ident'>copy_nonoverlapping</span>(<span class='ident'>w</span>.<span class='ident'>as_ptr</span>().<span class='ident'>offset</span>(<span class='number'>256</span>), <span class='self'>self</span>.<span class='ident'>p</span>.<span class='ident'>as_mut_ptr</span>(), <span class='number'>512</span>);
<span class='ident'>ptr</span>::<span class='ident'>copy_nonoverlapping</span>(<span class='ident'>w</span>.<span class='ident'>as_ptr</span>().<span class='ident'>offset</span>(<span class='number'>768</span>), <span class='self'>self</span>.<span class='ident'>q</span>.<span class='ident'>as_mut_ptr</span>(), <span class='number'>512</span>);
}
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>512</span> {
<span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>i</span>] <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>step</span>();
}
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>512</span> {
<span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>i</span>] <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>step</span>();
}
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='number'>0</span>;
}
<span class='kw'>fn</span> <span class='ident'>step</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='kw'>let</span> <span class='ident'>j</span> : <span class='ident'>usize</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>&</span> <span class='number'>0x1FF</span>;
<span class='comment'>// Precompute resources</span>
<span class='kw'>let</span> <span class='ident'>dim_j3</span> : <span class='ident'>usize</span> <span class='op'>=</span> (<span class='ident'>j</span>.<span class='ident'>wrapping_sub</span>(<span class='number'>3</span>)) <span class='op'>&</span> <span class='number'>0x1FF</span>;
<span class='kw'>let</span> <span class='ident'>dim_j10</span> : <span class='ident'>usize</span> <span class='op'>=</span> (<span class='ident'>j</span>.<span class='ident'>wrapping_sub</span>(<span class='number'>10</span>)) <span class='op'>&</span> <span class='number'>0x1FF</span>;
<span class='kw'>let</span> <span class='ident'>dim_j511</span> : <span class='ident'>usize</span> <span class='op'>=</span> (<span class='ident'>j</span>.<span class='ident'>wrapping_sub</span>(<span class='number'>511</span>)) <span class='op'>&</span> <span class='number'>0x1FF</span>;
<span class='kw'>let</span> <span class='ident'>dim_j12</span> : <span class='ident'>usize</span> <span class='op'>=</span> (<span class='ident'>j</span>.<span class='ident'>wrapping_sub</span>(<span class='number'>12</span>)) <span class='op'>&</span> <span class='number'>0x1FF</span>;
<span class='kw'>let</span> <span class='ident'>ret</span> : <span class='ident'>u32</span>;
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'><</span> <span class='number'>512</span> {
<span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>j</span>] <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>j</span>].<span class='ident'>wrapping_add</span>(<span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>dim_j3</span>].<span class='ident'>rotate_right</span>(<span class='number'>10</span>) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>dim_j511</span>].<span class='ident'>rotate_right</span>(<span class='number'>23</span>)).<span class='ident'>wrapping_add</span>(<span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>dim_j10</span>].<span class='ident'>rotate_right</span>(<span class='number'>8</span>));
<span class='ident'>ret</span> <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>q</span>[(<span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>dim_j12</span>] <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>].<span class='ident'>wrapping_add</span>(<span class='self'>self</span>.<span class='ident'>q</span>[(((<span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>dim_j12</span>] <span class='op'>>></span> <span class='number'>16</span>) <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='op'>+</span> <span class='number'>256</span>) <span class='kw'>as</span> <span class='ident'>usize</span>])) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>p</span>[<span class='ident'>j</span>];
} <span class='kw'>else</span> {
<span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>j</span>] <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>j</span>].<span class='ident'>wrapping_add</span>(<span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>dim_j3</span>].<span class='ident'>rotate_left</span>(<span class='number'>10</span>) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>dim_j511</span>].<span class='ident'>rotate_left</span>(<span class='number'>23</span>)).<span class='ident'>wrapping_add</span>(<span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>dim_j10</span>].<span class='ident'>rotate_left</span>(<span class='number'>8</span>));
<span class='ident'>ret</span> <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>p</span>[(<span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>dim_j12</span>] <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>].<span class='ident'>wrapping_add</span>(<span class='self'>self</span>.<span class='ident'>p</span>[(((<span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>dim_j12</span>] <span class='op'>>></span> <span class='number'>16</span>) <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='op'>+</span> <span class='number'>256</span>) <span class='kw'>as</span> <span class='ident'>usize</span>])) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>q</span>[<span class='ident'>j</span>];
}
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>+</span> <span class='number'>1</span>) <span class='op'>&</span> <span class='number'>0x3FF</span>;
<span class='ident'>ret</span>
}
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u8</span> {
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>output_index</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='kw'>let</span> <span class='ident'>step</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>step</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'>step</span>);
}
<span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>output</span>[<span class='self'>self</span>.<span class='ident'>output_index</span>];
<span class='self'>self</span>.<span class='ident'>output_index</span> <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>output_index</span> <span class='op'>+</span> <span class='number'>1</span>) <span class='op'>&</span> <span class='number'>0x3</span>;
<span class='ident'>ret</span>
}
}
<span class='kw'>fn</span> <span class='ident'>f1</span>(<span class='ident'>x</span>: <span class='ident'>u32</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='kw'>let</span> <span class='ident'>ret</span> : <span class='ident'>u32</span> <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>rotate_right</span>(<span class='number'>7</span>) <span class='op'>^</span> <span class='ident'>x</span>.<span class='ident'>rotate_right</span>(<span class='number'>18</span>) <span class='op'>^</span> (<span class='ident'>x</span> <span class='op'>>></span> <span class='number'>3</span>);
<span class='ident'>ret</span>
}
<span class='kw'>fn</span> <span class='ident'>f2</span>(<span class='ident'>x</span>: <span class='ident'>u32</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='kw'>let</span> <span class='ident'>ret</span> : <span class='ident'>u32</span> <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>rotate_right</span>(<span class='number'>17</span>) <span class='op'>^</span> <span class='ident'>x</span>.<span class='ident'>rotate_right</span>(<span class='number'>19</span>) <span class='op'>^</span> (<span class='ident'>x</span> <span class='op'>>></span> <span class='number'>10</span>);
<span class='ident'>ret</span>
}
<span class='kw'>impl</span> <span class='ident'>SynchronousStreamCipher</span> <span class='kw'>for</span> <span class='ident'>Hc128</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'>if</span> <span class='ident'>input</span>.<span class='ident'>len</span>() <span class='op'><=</span> <span class='number'>4</span> {
<span class='comment'>// Process data bytewise</span>
<span class='kw'>for</span> (<span class='ident'>inb</span>, <span class='ident'>outb</span>) <span class='kw'>in</span> <span class='ident'>input</span>.<span class='ident'>iter</span>().<span class='ident'>zip</span>(<span class='ident'>output</span>.<span class='ident'>iter_mut</span>()) {
<span class='kw-2'>*</span><span class='ident'>outb</span> <span class='op'>=</span> <span class='kw-2'>*</span><span class='ident'>inb</span> <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>next</span>();
}
} <span class='kw'>else</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>data_index</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='ident'>data_index_end</span> <span class='op'>=</span> <span class='ident'>data_index</span> <span class='op'>+</span> <span class='ident'>input</span>.<span class='ident'>len</span>();
<span class='comment'>/* Process any unused keystream (self.buffer)
* remaining from previous operations */</span>
<span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>output_index</span> <span class='op'>></span> <span class='number'>0</span> <span class='op'>&&</span> <span class='ident'>data_index</span> <span class='op'><</span> <span class='ident'>data_index_end</span> {
<span class='ident'>output</span>[<span class='ident'>data_index</span>] <span class='op'>=</span> <span class='ident'>input</span>[<span class='ident'>data_index</span>] <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>next</span>();
<span class='ident'>data_index</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
<span class='comment'>/* Process input data blockwise until depleted,
* or remaining length less than block size
* (size of the keystream buffer, self.buffer : 4 bytes) */</span>
<span class='kw'>while</span> <span class='ident'>data_index</span> <span class='op'>+</span> <span class='number'>4</span> <span class='op'><=</span> <span class='ident'>data_index_end</span> {
<span class='kw'>let</span> <span class='ident'>data_index_inc</span> <span class='op'>=</span> <span class='ident'>data_index</span> <span class='op'>+</span> <span class='number'>4</span>;
<span class='comment'>// Read input as le-u32</span>
<span class='kw'>let</span> <span class='ident'>input_u32</span> <span class='op'>=</span> <span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>input</span>[<span class='ident'>data_index</span>..<span class='ident'>data_index_inc</span>]);
<span class='comment'>// XOR with keystream u32</span>
<span class='kw'>let</span> <span class='ident'>xored</span> <span class='op'>=</span> <span class='ident'>input_u32</span> <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>step</span>();
<span class='comment'>// Write output as le-u32</span>
<span class='ident'>write_u32_le</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>[<span class='ident'>data_index</span>..<span class='ident'>data_index_inc</span>], <span class='ident'>xored</span>);
<span class='ident'>data_index</span> <span class='op'>=</span> <span class='ident'>data_index_inc</span>;
}
<span class='comment'>/* Process remaining data, if any
* (e.g. input length not divisible by 4) */</span>
<span class='kw'>while</span> <span class='ident'>data_index</span> <span class='op'><</span> <span class='ident'>data_index_end</span> {
<span class='ident'>output</span>[<span class='ident'>data_index</span>] <span class='op'>=</span> <span class='ident'>input</span>[<span class='ident'>data_index</span>] <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>next</span>();
<span class='ident'>data_index</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
}
}
}
<span class='kw'>impl</span> <span class='ident'>Encryptor</span> <span class='kw'>for</span> <span class='ident'>Hc128</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'>Hc128</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'>hc128</span>::<span class='ident'>Hc128</span>;
<span class='kw'>use</span> <span class='ident'>symmetriccipher</span>::<span class='ident'>SynchronousStreamCipher</span>;
<span class='kw'>use</span> <span class='ident'>serialize</span>::<span class='ident'>hex</span>::{<span class='ident'>FromHex</span>};
<span class='comment'>// Vectors from http://www.ecrypt.eu.org/stream/svn/viewcvs.cgi/ecrypt/trunk/submissions/hc-256/hc-128/verified.test-vectors?rev=210&view=markup</span>
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_hc128_ecrypt_set_2_vector_0</span>() {
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='string'>"00000000000000000000000000000000"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</span>();
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span> <span class='string'>"00000000000000000000000000000000"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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='ident'>expected_output_hex</span> <span class='op'>=</span> <span class='string'>"82001573A003FD3B7FD72FFB0EAF63AAC62F12DEB629DCA72785A66268EC758B1EDB36900560898178E0AD009ABF1F491330DC1C246E3D6CB264F6900271D59C"</span>;
<span class='kw'>let</span> <span class='ident'>expected_output</span> <span class='op'>=</span> <span class='ident'>expected_output_hex</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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'>64</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</span>::<span class='ident'>new</span>(<span class='ident'>key</span>.<span class='ident'>as_ref</span>(), <span class='ident'>nonce</span>.<span class='ident'>as_ref</span>());
<span class='ident'>hc128</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='kw'>let</span> <span class='ident'>result</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>] <span class='op'>=</span> <span class='ident'>output</span>.<span class='ident'>as_ref</span>();
<span class='kw'>let</span> <span class='ident'>expected</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>] <span class='op'>=</span> <span class='ident'>expected_output</span>.<span class='ident'>as_ref</span>();
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>result</span> <span class='op'>==</span> <span class='ident'>expected</span>); }
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_hc128_ecrypt_set_6_vector_1</span>() {
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='string'>"0558ABFE51A4F74A9DF04396E93C8FE2"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</span>();
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span> <span class='string'>"167DE44BB21980E74EB51C83EA51B81F"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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='ident'>expected_output_hex</span> <span class='op'>=</span> <span class='string'>"4F864BF3C96D0363B1903F0739189138F6ED2BC0AF583FEEA0CEA66BA7E06E63FB28BF8B3CA0031D24ABB511C57DD17BFC2861C32400072CB680DF2E58A5CECC"</span>;
<span class='kw'>let</span> <span class='ident'>expected_output</span> <span class='op'>=</span> <span class='ident'>expected_output_hex</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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'>64</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</span>::<span class='ident'>new</span>(<span class='ident'>key</span>.<span class='ident'>as_ref</span>(), <span class='ident'>nonce</span>.<span class='ident'>as_ref</span>());
<span class='ident'>hc128</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='kw'>let</span> <span class='ident'>result</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>] <span class='op'>=</span> <span class='ident'>output</span>.<span class='ident'>as_ref</span>();
<span class='kw'>let</span> <span class='ident'>expected</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>] <span class='op'>=</span> <span class='ident'>expected_output</span>.<span class='ident'>as_ref</span>();
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>result</span> <span class='op'>==</span> <span class='ident'>expected</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_hc128_ecrypt_set_6_vector_2</span>() {
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='string'>"0A5DB00356A9FC4FA2F5489BEE4194E7"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</span>();
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span> <span class='string'>"1F86ED54BB2289F057BE258CF35AC128"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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='ident'>expected_output_hex</span> <span class='op'>=</span> <span class='string'>"82168AB0023B79AAF1E6B4D823855E14A7084378036A951B1CFEF35173875ED86CB66AB8410491A08582BE40080C3102193BA567F9E95D096C3CC60927DD7901"</span>;
<span class='kw'>let</span> <span class='ident'>expected_output</span> <span class='op'>=</span> <span class='ident'>expected_output_hex</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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'>64</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</span>::<span class='ident'>new</span>(<span class='ident'>key</span>.<span class='ident'>as_ref</span>(), <span class='ident'>nonce</span>.<span class='ident'>as_ref</span>());
<span class='ident'>hc128</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='kw'>let</span> <span class='ident'>result</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>] <span class='op'>=</span> <span class='ident'>output</span>.<span class='ident'>as_ref</span>();
<span class='kw'>let</span> <span class='ident'>expected</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>] <span class='op'>=</span> <span class='ident'>expected_output</span>.<span class='ident'>as_ref</span>();
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>result</span> <span class='op'>==</span> <span class='ident'>expected</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_hc128_ecrypt_set_6_vector_3</span>() {
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='string'>"0F62B5085BAE0154A7FA4DA0F34699EC"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</span>();
<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span> <span class='string'>"288FF65DC42B92F960C72E95FC63CA31"</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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='ident'>expected_output_hex</span> <span class='op'>=</span> <span class='string'>"1CD8AEDDFE52E217E835D0B7E84E2922D04B1ADBCA53C4522B1AA604C42856A90AF83E2614BCE65C0AECABDD8975B55700D6A26D52FFF0888DA38F1DE20B77B7"</span>;
<span class='kw'>let</span> <span class='ident'>expected_output</span> <span class='op'>=</span> <span class='ident'>expected_output_hex</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</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'>64</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</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'>hc128</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</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>output</span>[..] <span class='op'>==</span> <span class='kw-2'>&</span><span class='ident'>expected_output</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'>hc128</span>::<span class='ident'>Hc128</span>;
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>hc128_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'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>16</span>], <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>16</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'>hc128</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'>hc128_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'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>16</span>], <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>16</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'>hc128</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'>hc128_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'>hc128</span> <span class='op'>=</span> <span class='ident'>Hc128</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>16</span>], <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>16</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'>hc128</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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