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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>libusual: usual/crypto/chacha.h File Reference</title>
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<!-- Generated by Doxygen 1.7.6.1 -->
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<li><a href="index.html"><span>Main Page</span></a></li>
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<div class="header">
<div class="summary">
<a href="#nested-classes">Data Structures</a> |
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">usual/crypto/chacha.h File Reference</div> </div>
</div><!--header-->
<div class="contents">
<p><a class="el" href="struct_cha_cha.html" title="ChaCha state.">ChaCha</a> cipher.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="struct_cha_cha.html">ChaCha</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight"><a class="el" href="struct_cha_cha.html" title="ChaCha state.">ChaCha</a> state. <a href="struct_cha_cha.html#details">More...</a><br/></td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="chacha_8h.html#a713f784e1a48eb8c4f341fc803f50610">chacha_set_key_256</a> (struct <a class="el" href="struct_cha_cha.html">ChaCha</a> *ctx, const void *key)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set 256-bit key. <a href="#a713f784e1a48eb8c4f341fc803f50610"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="chacha_8h.html#a1b752294032b9615188dcc809534fbe4">chacha_set_key_128</a> (struct <a class="el" href="struct_cha_cha.html">ChaCha</a> *ctx, const void *key)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set 128-bit key. <a href="#a1b752294032b9615188dcc809534fbe4"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="chacha_8h.html#a1cdcb29d1a56b0ba5ee2066997322c36">chacha_set_nonce</a> (struct <a class="el" href="struct_cha_cha.html">ChaCha</a> *ctx, uint32_t counter_low, uint32_t counter_high, const void *iv)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set 2x32-bit counter and 8-byte IV. <a href="#a1cdcb29d1a56b0ba5ee2066997322c36"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="chacha_8h.html#a8d310be05e6dc177a149ad691b8cf0fb">chacha_keystream</a> (struct <a class="el" href="struct_cha_cha.html">ChaCha</a> *ctx, void *stream, size_t bytes)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Extract plain keystream. <a href="#a8d310be05e6dc177a149ad691b8cf0fb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="chacha_8h.html#a9860319233fda415d13f00afadbe2c1c">chacha_keystream_xor</a> (struct <a class="el" href="struct_cha_cha.html">ChaCha</a> *ctx, const void *plain, void *encrypted, size_t bytes)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">XOR data with keystream. <a href="#a9860319233fda415d13f00afadbe2c1c"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p><a class="el" href="struct_cha_cha.html" title="ChaCha state.">ChaCha</a> cipher. </p>
</div><hr/><h2>Function Documentation</h2>
<a class="anchor" id="a713f784e1a48eb8c4f341fc803f50610"></a><!-- doxytag: member="chacha.h::chacha_set_key_256" ref="a713f784e1a48eb8c4f341fc803f50610" args="(struct ChaCha *ctx, const void *key)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="chacha_8h.html#a713f784e1a48eb8c4f341fc803f50610">chacha_set_key_256</a> </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="struct_cha_cha.html">ChaCha</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>key</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set 256-bit key. </p>
</div>
</div>
<a class="anchor" id="a1b752294032b9615188dcc809534fbe4"></a><!-- doxytag: member="chacha.h::chacha_set_key_128" ref="a1b752294032b9615188dcc809534fbe4" args="(struct ChaCha *ctx, const void *key)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="chacha_8h.html#a1b752294032b9615188dcc809534fbe4">chacha_set_key_128</a> </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="struct_cha_cha.html">ChaCha</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>key</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set 128-bit key. </p>
</div>
</div>
<a class="anchor" id="a1cdcb29d1a56b0ba5ee2066997322c36"></a><!-- doxytag: member="chacha.h::chacha_set_nonce" ref="a1cdcb29d1a56b0ba5ee2066997322c36" args="(struct ChaCha *ctx, uint32_t counter_low, uint32_t counter_high, const void *iv)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="chacha_8h.html#a1cdcb29d1a56b0ba5ee2066997322c36">chacha_set_nonce</a> </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="struct_cha_cha.html">ChaCha</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>counter_low</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>counter_high</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>iv</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set 2x32-bit counter and 8-byte IV. </p>
</div>
</div>
<a class="anchor" id="a8d310be05e6dc177a149ad691b8cf0fb"></a><!-- doxytag: member="chacha.h::chacha_keystream" ref="a8d310be05e6dc177a149ad691b8cf0fb" args="(struct ChaCha *ctx, void *stream, size_t bytes)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="chacha_8h.html#a8d310be05e6dc177a149ad691b8cf0fb">chacha_keystream</a> </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="struct_cha_cha.html">ChaCha</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>stream</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>bytes</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Extract plain keystream. </p>
</div>
</div>
<a class="anchor" id="a9860319233fda415d13f00afadbe2c1c"></a><!-- doxytag: member="chacha.h::chacha_keystream_xor" ref="a9860319233fda415d13f00afadbe2c1c" args="(struct ChaCha *ctx, const void *plain, void *encrypted, size_t bytes)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="chacha_8h.html#a9860319233fda415d13f00afadbe2c1c">chacha_keystream_xor</a> </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="struct_cha_cha.html">ChaCha</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>plain</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>encrypted</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>bytes</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>XOR data with keystream. </p>
</div>
</div>
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