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<p>APR-UTIL siphash library "SipHash-c-d is a family of pseudorandom functions (a.k.a. keyed
hash functions) optimized for speed on short messages", designed by Jean-Philippe Aumasson and Daniel J. Bernstein. It generates a 64bit hash (or MAC) from the message and a 128bit key. See <a href="http://cr.yp.to/siphash/siphash-20120620.pdf">http://cr.yp.to/siphash/siphash-20120620.pdf</a> for the details, c is the number of compression rounds, d the number of finalization rounds; we also define fast implementations for c = 2 with d = 4 (aka siphash-2-4), and c = 4 with d = 8 (aka siphash-4-8), as recommended parameters per the authors.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include "apr.h"</code><br />
<code>#include "apu.h"</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for apr_siphash.h:</div>
<div class="dyncontent">
<div class="center"><img src="apr__siphash_8h__incl.png" border="0" usemap="#aapr__siphash_8h" alt=""/></div>
</div>
</div>
<p><a href="apr__siphash_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="define-members" name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a38fd9e25fc9245e72f93a320b43f175f" id="r_a38fd9e25fc9245e72f93a320b43f175f"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#a38fd9e25fc9245e72f93a320b43f175f">APR_SIPHASH_DSIZE</a>   8</td></tr>
<tr class="separator:a38fd9e25fc9245e72f93a320b43f175f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac4b06c5a46c1f72a42c822de272ecfc3" id="r_ac4b06c5a46c1f72a42c822de272ecfc3"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#ac4b06c5a46c1f72a42c822de272ecfc3">APR_SIPHASH_KSIZE</a>   16</td></tr>
<tr class="separator:ac4b06c5a46c1f72a42c822de272ecfc3"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a48a436589e140465c51c97b7532bbcaa" id="r_a48a436589e140465c51c97b7532bbcaa"><td class="memItemLeft" align="right" valign="top">apr_uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#a48a436589e140465c51c97b7532bbcaa">apr_siphash</a> (const void *src, apr_size_t len, const unsigned char key[<a class="el" href="apr__siphash_8h.html#ac4b06c5a46c1f72a42c822de272ecfc3">APR_SIPHASH_KSIZE</a>], unsigned int c, unsigned int d)</td></tr>
<tr class="memdesc:a48a436589e140465c51c97b7532bbcaa"><td class="mdescLeft"> </td><td class="mdescRight">Computes SipHash-c-d, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key. <br /></td></tr>
<tr class="separator:a48a436589e140465c51c97b7532bbcaa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:affc487c88dd5c6123ff03e43e797644b" id="r_affc487c88dd5c6123ff03e43e797644b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#affc487c88dd5c6123ff03e43e797644b">apr_siphash_auth</a> (unsigned char out[<a class="el" href="apr__siphash_8h.html#a38fd9e25fc9245e72f93a320b43f175f">APR_SIPHASH_DSIZE</a>], const void *src, apr_size_t len, const unsigned char key[<a class="el" href="apr__siphash_8h.html#ac4b06c5a46c1f72a42c822de272ecfc3">APR_SIPHASH_KSIZE</a>], unsigned int c, unsigned int d)</td></tr>
<tr class="memdesc:affc487c88dd5c6123ff03e43e797644b"><td class="mdescLeft"> </td><td class="mdescRight">Computes SipHash-c-d, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly unaligned buffer (using the little endian representation as defined by the authors for interoperabilty) usable as a MAC. <br /></td></tr>
<tr class="separator:affc487c88dd5c6123ff03e43e797644b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad6b9383f82cf1c43a67774aec08b88ae" id="r_ad6b9383f82cf1c43a67774aec08b88ae"><td class="memItemLeft" align="right" valign="top">apr_uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#ad6b9383f82cf1c43a67774aec08b88ae">apr_siphash24</a> (const void *src, apr_size_t len, const unsigned char key[<a class="el" href="apr__siphash_8h.html#ac4b06c5a46c1f72a42c822de272ecfc3">APR_SIPHASH_KSIZE</a>])</td></tr>
<tr class="memdesc:ad6b9383f82cf1c43a67774aec08b88ae"><td class="mdescLeft"> </td><td class="mdescRight">Computes SipHash-2-4, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key. <br /></td></tr>
<tr class="separator:ad6b9383f82cf1c43a67774aec08b88ae"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2246ecf996f299fd1fb16b0a835b41a4" id="r_a2246ecf996f299fd1fb16b0a835b41a4"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#a2246ecf996f299fd1fb16b0a835b41a4">apr_siphash24_auth</a> (unsigned char out[<a class="el" href="apr__siphash_8h.html#a38fd9e25fc9245e72f93a320b43f175f">APR_SIPHASH_DSIZE</a>], const void *src, apr_size_t len, const unsigned char key[<a class="el" href="apr__siphash_8h.html#ac4b06c5a46c1f72a42c822de272ecfc3">APR_SIPHASH_KSIZE</a>])</td></tr>
<tr class="memdesc:a2246ecf996f299fd1fb16b0a835b41a4"><td class="mdescLeft"> </td><td class="mdescRight">Computes SipHash-2-4, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly unaligned buffer (using the little endian representation as defined by the authors for interoperabilty) usable as a MAC. <br /></td></tr>
<tr class="separator:a2246ecf996f299fd1fb16b0a835b41a4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abb7392add9bc947e8b714d2597ca2bf8" id="r_abb7392add9bc947e8b714d2597ca2bf8"><td class="memItemLeft" align="right" valign="top">apr_uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#abb7392add9bc947e8b714d2597ca2bf8">apr_siphash48</a> (const void *src, apr_size_t len, const unsigned char key[<a class="el" href="apr__siphash_8h.html#ac4b06c5a46c1f72a42c822de272ecfc3">APR_SIPHASH_KSIZE</a>])</td></tr>
<tr class="memdesc:abb7392add9bc947e8b714d2597ca2bf8"><td class="mdescLeft"> </td><td class="mdescRight">Computes SipHash-4-8, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key. <br /></td></tr>
<tr class="separator:abb7392add9bc947e8b714d2597ca2bf8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6ca3000e7f1b692a7845f78c4ce20004" id="r_a6ca3000e7f1b692a7845f78c4ce20004"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="apr__siphash_8h.html#a6ca3000e7f1b692a7845f78c4ce20004">apr_siphash48_auth</a> (unsigned char out[<a class="el" href="apr__siphash_8h.html#a38fd9e25fc9245e72f93a320b43f175f">APR_SIPHASH_DSIZE</a>], const void *src, apr_size_t len, const unsigned char key[<a class="el" href="apr__siphash_8h.html#ac4b06c5a46c1f72a42c822de272ecfc3">APR_SIPHASH_KSIZE</a>])</td></tr>
<tr class="memdesc:a6ca3000e7f1b692a7845f78c4ce20004"><td class="mdescLeft"> </td><td class="mdescRight">Computes SipHash-4-8, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly unaligned buffer (using the little endian representation as defined by the authors for interoperabilty) usable as a MAC. <br /></td></tr>
<tr class="separator:a6ca3000e7f1b692a7845f78c4ce20004"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>APR-UTIL siphash library "SipHash-c-d is a family of pseudorandom functions (a.k.a. keyed
hash functions) optimized for speed on short messages", designed by Jean-Philippe Aumasson and Daniel J. Bernstein. It generates a 64bit hash (or MAC) from the message and a 128bit key. See <a href="http://cr.yp.to/siphash/siphash-20120620.pdf">http://cr.yp.to/siphash/siphash-20120620.pdf</a> for the details, c is the number of compression rounds, d the number of finalization rounds; we also define fast implementations for c = 2 with d = 4 (aka siphash-2-4), and c = 4 with d = 8 (aka siphash-4-8), as recommended parameters per the authors. </p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="a38fd9e25fc9245e72f93a320b43f175f" name="a38fd9e25fc9245e72f93a320b43f175f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a38fd9e25fc9245e72f93a320b43f175f">◆ </a></span>APR_SIPHASH_DSIZE</h2>
<div class="memitem">
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<td class="memname">#define APR_SIPHASH_DSIZE   8</td>
</tr>
</table>
</div><div class="memdoc">
<p>size of the siphash digest </p>
</div>
</div>
<a id="ac4b06c5a46c1f72a42c822de272ecfc3" name="ac4b06c5a46c1f72a42c822de272ecfc3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac4b06c5a46c1f72a42c822de272ecfc3">◆ </a></span>APR_SIPHASH_KSIZE</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">#define APR_SIPHASH_KSIZE   16</td>
</tr>
</table>
</div><div class="memdoc">
<p>size of the siphash key </p>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="a48a436589e140465c51c97b7532bbcaa" name="a48a436589e140465c51c97b7532bbcaa"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a48a436589e140465c51c97b7532bbcaa">◆ </a></span>apr_siphash()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_uint64_t apr_siphash </td>
<td>(</td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char </td>
<td class="paramname"><em>key</em>[APR_SIPHASH_KSIZE], </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>d</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Computes SipHash-c-d, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">src</td><td>The message </td></tr>
<tr><td class="paramname">len</td><td>The length of the message </td></tr>
<tr><td class="paramname">key</td><td>The secret key </td></tr>
<tr><td class="paramname">c</td><td>The number of compression rounds </td></tr>
<tr><td class="paramname">d</td><td>The number of finalization rounds </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The hash value as a 64bit unsigned integer </dd></dl>
</div>
</div>
<a id="ad6b9383f82cf1c43a67774aec08b88ae" name="ad6b9383f82cf1c43a67774aec08b88ae"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad6b9383f82cf1c43a67774aec08b88ae">◆ </a></span>apr_siphash24()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">apr_uint64_t apr_siphash24 </td>
<td>(</td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char </td>
<td class="paramname"><em>key</em>[APR_SIPHASH_KSIZE] </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Computes SipHash-2-4, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">src</td><td>The message to hash </td></tr>
<tr><td class="paramname">len</td><td>The length of the message </td></tr>
<tr><td class="paramname">key</td><td>The secret key </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The hash value as a 64bit unsigned integer </dd></dl>
</div>
</div>
<a id="a2246ecf996f299fd1fb16b0a835b41a4" name="a2246ecf996f299fd1fb16b0a835b41a4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2246ecf996f299fd1fb16b0a835b41a4">◆ </a></span>apr_siphash24_auth()</h2>
<div class="memitem">
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<table class="memname">
<tr>
<td class="memname">void apr_siphash24_auth </td>
<td>(</td>
<td class="paramtype">unsigned char </td>
<td class="paramname"><em>out</em>[APR_SIPHASH_DSIZE], </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char </td>
<td class="paramname"><em>key</em>[APR_SIPHASH_KSIZE] </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Computes SipHash-2-4, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly unaligned buffer (using the little endian representation as defined by the authors for interoperabilty) usable as a MAC. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">out</td><td>The output buffer (or MAC) </td></tr>
<tr><td class="paramname">src</td><td>The message </td></tr>
<tr><td class="paramname">len</td><td>The length of the message </td></tr>
<tr><td class="paramname">key</td><td>The secret key </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The hash value as a 64bit unsigned integer </dd></dl>
</div>
</div>
<a id="abb7392add9bc947e8b714d2597ca2bf8" name="abb7392add9bc947e8b714d2597ca2bf8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#abb7392add9bc947e8b714d2597ca2bf8">◆ </a></span>apr_siphash48()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_uint64_t apr_siphash48 </td>
<td>(</td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char </td>
<td class="paramname"><em>key</em>[APR_SIPHASH_KSIZE] </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Computes SipHash-4-8, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">src</td><td>The message </td></tr>
<tr><td class="paramname">len</td><td>The length of the message </td></tr>
<tr><td class="paramname">key</td><td>The secret key </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The hash value as a 64bit unsigned integer </dd></dl>
</div>
</div>
<a id="a6ca3000e7f1b692a7845f78c4ce20004" name="a6ca3000e7f1b692a7845f78c4ce20004"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6ca3000e7f1b692a7845f78c4ce20004">◆ </a></span>apr_siphash48_auth()</h2>
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<td class="memname">void apr_siphash48_auth </td>
<td>(</td>
<td class="paramtype">unsigned char </td>
<td class="paramname"><em>out</em>[APR_SIPHASH_DSIZE], </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>src</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char </td>
<td class="paramname"><em>key</em>[APR_SIPHASH_KSIZE] </td>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Computes SipHash-4-8, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly unaligned buffer (using the little endian representation as defined by the authors for interoperabilty) usable as a MAC. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">out</td><td>The output buffer (or MAC) </td></tr>
<tr><td class="paramname">src</td><td>The message </td></tr>
<tr><td class="paramname">len</td><td>The length of the message </td></tr>
<tr><td class="paramname">key</td><td>The secret key </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The hash value as a 64bit unsigned integer </dd></dl>
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<a id="affc487c88dd5c6123ff03e43e797644b" name="affc487c88dd5c6123ff03e43e797644b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#affc487c88dd5c6123ff03e43e797644b">◆ </a></span>apr_siphash_auth()</h2>
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<td class="memname">void apr_siphash_auth </td>
<td>(</td>
<td class="paramtype">unsigned char </td>
<td class="paramname"><em>out</em>[APR_SIPHASH_DSIZE], </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char </td>
<td class="paramname"><em>key</em>[APR_SIPHASH_KSIZE], </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>d</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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</div><div class="memdoc">
<p>Computes SipHash-c-d, producing a 64bit (APR_SIPHASH_DSIZE) hash from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly unaligned buffer (using the little endian representation as defined by the authors for interoperabilty) usable as a MAC. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">out</td><td>The output buffer (or MAC) </td></tr>
<tr><td class="paramname">src</td><td>The message </td></tr>
<tr><td class="paramname">len</td><td>The length of the message </td></tr>
<tr><td class="paramname">key</td><td>The secret key </td></tr>
<tr><td class="paramname">c</td><td>The number of compression rounds </td></tr>
<tr><td class="paramname">d</td><td>The number of finalization rounds </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The hash value as a 64bit unsigned integer </dd></dl>
</div>
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