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   &#160;<span id="projectnumber">2.7.1</span>
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<a href="#typedef-members">Typedefs</a> &#124;
<a href="#enum-members">Enumerations</a> &#124;
<a href="#func-members">Functions</a>  </div>
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<div class="title">HMAC</div>  </div>
<div class="ingroups"><a class="el" href="group__lavu__crypto.html">Crypto and Hashing</a></div></div><!--header-->
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<table class="memberdecls">
<tr><td colspan="2"><h2><a name="typedef-members"></a>
Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a></td></tr>
<tr><td colspan="2"><h2><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#gaec34f18155d20236c9f39961bb58f7d4">AVHMACType</a> { <br/>
&#160;&#160;<a class="el" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a063ecd7e758d4abcd438aba0b9708c7a">AV_HMAC_MD5</a>, 
<a class="el" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a421f7f38b635e8d5ef1cc45d1867d5a7">AV_HMAC_SHA1</a>, 
<a class="el" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a283c3d421f8279ec3530d0bd0cb56313">AV_HMAC_SHA224</a> =  10, 
<a class="el" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a2f0a1a712c6e85b5149baa0780dcda4c">AV_HMAC_SHA256</a>, 
<br/>
&#160;&#160;<a class="el" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a268dfcdccbe89e48a662989087728ff7">AV_HMAC_SHA384</a>, 
<a class="el" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a811a3754bdc32d9e258c6504759a6608">AV_HMAC_SHA512</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"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#gaae6685287d6645eb1be86525ecee17ae">av_hmac_alloc</a> (enum <a class="el" href="group__lavu__hmac.html#gaec34f18155d20236c9f39961bb58f7d4">AVHMACType</a> type)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Allocate an AVHMAC context.  <a href="#gaae6685287d6645eb1be86525ecee17ae"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#gaaa2951b832fdc7abed35a9112f7f1a02">av_hmac_free</a> (<a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Free an AVHMAC context.  <a href="#gaaa2951b832fdc7abed35a9112f7f1a02"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#gae91a0c1f832c269006164b29df7e9aa8">av_hmac_init</a> (<a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, const uint8_t *key, unsigned int keylen)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialize an AVHMAC context with an authentication key.  <a href="#gae91a0c1f832c269006164b29df7e9aa8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#ga4c3307cc9b1f331a15e999f8dacb90de">av_hmac_update</a> (<a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, const uint8_t *data, unsigned int len)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Hash data with the HMAC.  <a href="#ga4c3307cc9b1f331a15e999f8dacb90de"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#ga02f0b343d9045500beef1f6b09c650cd">av_hmac_final</a> (<a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, uint8_t *out, unsigned int outlen)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Finish hashing and output the HMAC digest.  <a href="#ga02f0b343d9045500beef1f6b09c650cd"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__hmac.html#ga22d17ebca8556c49be5c22e706de1ab3">av_hmac_calc</a> (<a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, const uint8_t *data, unsigned int len, const uint8_t *key, unsigned int keylen, uint8_t *out, unsigned int outlen)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Hash an array of data with a key.  <a href="#ga22d17ebca8556c49be5c22e706de1ab3"></a><br/></td></tr>
</table>
<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="gad8c944f9437e65d8e8ebc526bdeee676"></a><!-- doxytag: member="hmac.h::AVHMAC" ref="gad8c944f9437e65d8e8ebc526bdeee676" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">typedef struct <a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> <a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Definition at line <a class="el" href="hmac_8h_source.html#l00041">41</a> of file <a class="el" href="hmac_8h_source.html">hmac.h</a>.</p>

</div>
</div>
<hr/><h2>Enumeration Type Documentation</h2>
<a class="anchor" id="gaec34f18155d20236c9f39961bb58f7d4"></a><!-- doxytag: member="hmac.h::AVHMACType" ref="gaec34f18155d20236c9f39961bb58f7d4" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum <a class="el" href="group__lavu__hmac.html#gaec34f18155d20236c9f39961bb58f7d4">AVHMACType</a></td>
        </tr>
      </table>
</div>
<div class="memdoc">
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="ggaec34f18155d20236c9f39961bb58f7d4a063ecd7e758d4abcd438aba0b9708c7a"></a><!-- doxytag: member="AV_HMAC_MD5" ref="ggaec34f18155d20236c9f39961bb58f7d4a063ecd7e758d4abcd438aba0b9708c7a" args="" -->AV_HMAC_MD5</em>&nbsp;</td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaec34f18155d20236c9f39961bb58f7d4a421f7f38b635e8d5ef1cc45d1867d5a7"></a><!-- doxytag: member="AV_HMAC_SHA1" ref="ggaec34f18155d20236c9f39961bb58f7d4a421f7f38b635e8d5ef1cc45d1867d5a7" args="" -->AV_HMAC_SHA1</em>&nbsp;</td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaec34f18155d20236c9f39961bb58f7d4a283c3d421f8279ec3530d0bd0cb56313"></a><!-- doxytag: member="AV_HMAC_SHA224" ref="ggaec34f18155d20236c9f39961bb58f7d4a283c3d421f8279ec3530d0bd0cb56313" args="" -->AV_HMAC_SHA224</em>&nbsp;</td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaec34f18155d20236c9f39961bb58f7d4a2f0a1a712c6e85b5149baa0780dcda4c"></a><!-- doxytag: member="AV_HMAC_SHA256" ref="ggaec34f18155d20236c9f39961bb58f7d4a2f0a1a712c6e85b5149baa0780dcda4c" args="" -->AV_HMAC_SHA256</em>&nbsp;</td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaec34f18155d20236c9f39961bb58f7d4a268dfcdccbe89e48a662989087728ff7"></a><!-- doxytag: member="AV_HMAC_SHA384" ref="ggaec34f18155d20236c9f39961bb58f7d4a268dfcdccbe89e48a662989087728ff7" args="" -->AV_HMAC_SHA384</em>&nbsp;</td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaec34f18155d20236c9f39961bb58f7d4a811a3754bdc32d9e258c6504759a6608"></a><!-- doxytag: member="AV_HMAC_SHA512" ref="ggaec34f18155d20236c9f39961bb58f7d4a811a3754bdc32d9e258c6504759a6608" args="" -->AV_HMAC_SHA512</em>&nbsp;</td><td>
</td></tr>
</table>
</dd>
</dl>

<p>Definition at line <a class="el" href="hmac_8h_source.html#l00032">32</a> of file <a class="el" href="hmac_8h_source.html">hmac.h</a>.</p>

</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gaae6685287d6645eb1be86525ecee17ae"></a><!-- doxytag: member="hmac.h::av_hmac_alloc" ref="gaae6685287d6645eb1be86525ecee17ae" args="(enum AVHMACType type)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a>* <a class="el" href="group__lavu__hmac.html#gaae6685287d6645eb1be86525ecee17ae">av_hmac_alloc</a> </td>
          <td>(</td>
          <td class="paramtype">enum <a class="el" href="group__lavu__hmac.html#gaec34f18155d20236c9f39961bb58f7d4">AVHMACType</a>&#160;</td>
          <td class="paramname"><em>type</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Allocate an AVHMAC context. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
  <table class="params">
    <tr><td class="paramname">type</td><td>The hash function used for the HMAC. </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="gaaa2951b832fdc7abed35a9112f7f1a02"></a><!-- doxytag: member="hmac.h::av_hmac_free" ref="gaaa2951b832fdc7abed35a9112f7f1a02" args="(AVHMAC *ctx)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void <a class="el" href="group__lavu__hmac.html#gaaa2951b832fdc7abed35a9112f7f1a02">av_hmac_free</a> </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *&#160;</td>
          <td class="paramname"><em>ctx</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Free an AVHMAC context. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
  <table class="params">
    <tr><td class="paramname">ctx</td><td>The context to free, may be NULL </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="gae91a0c1f832c269006164b29df7e9aa8"></a><!-- doxytag: member="hmac.h::av_hmac_init" ref="gae91a0c1f832c269006164b29df7e9aa8" args="(AVHMAC *ctx, const uint8_t *key, unsigned int keylen)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void <a class="el" href="group__lavu__hmac.html#gae91a0c1f832c269006164b29df7e9aa8">av_hmac_init</a> </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *&#160;</td>
          <td class="paramname"><em>ctx</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint8_t *&#160;</td>
          <td class="paramname"><em>key</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>keylen</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Initialize an AVHMAC context with an authentication key. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
  <table class="params">
    <tr><td class="paramname">ctx</td><td>The HMAC context </td></tr>
    <tr><td class="paramname">key</td><td>The authentication key </td></tr>
    <tr><td class="paramname">keylen</td><td>The length of the key, in bytes </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="ga4c3307cc9b1f331a15e999f8dacb90de"></a><!-- doxytag: member="hmac.h::av_hmac_update" ref="ga4c3307cc9b1f331a15e999f8dacb90de" args="(AVHMAC *ctx, const uint8_t *data, unsigned int len)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void <a class="el" href="group__lavu__hmac.html#ga4c3307cc9b1f331a15e999f8dacb90de">av_hmac_update</a> </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *&#160;</td>
          <td class="paramname"><em>ctx</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint8_t *&#160;</td>
          <td class="paramname"><em>data</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>len</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Hash data with the HMAC. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
  <table class="params">
    <tr><td class="paramname">ctx</td><td>The HMAC context </td></tr>
    <tr><td class="paramname">data</td><td>The data to hash </td></tr>
    <tr><td class="paramname">len</td><td>The length of the data, in bytes </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="ga02f0b343d9045500beef1f6b09c650cd"></a><!-- doxytag: member="hmac.h::av_hmac_final" ref="ga02f0b343d9045500beef1f6b09c650cd" args="(AVHMAC *ctx, uint8_t *out, unsigned int outlen)" -->
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<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">int <a class="el" href="group__lavu__hmac.html#ga02f0b343d9045500beef1f6b09c650cd">av_hmac_final</a> </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *&#160;</td>
          <td class="paramname"><em>ctx</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint8_t *&#160;</td>
          <td class="paramname"><em>out</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>outlen</em>&#160;</td>
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        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
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</div>
<div class="memdoc">

<p>Finish hashing and output the HMAC digest. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
  <table class="params">
    <tr><td class="paramname">ctx</td><td>The HMAC context </td></tr>
    <tr><td class="paramname">out</td><td>The output buffer to write the digest into </td></tr>
    <tr><td class="paramname">outlen</td><td>The length of the out buffer, in bytes </td></tr>
  </table>
  </dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The number of bytes written to out, or a negative error code. </dd></dl>

</div>
</div>
<a class="anchor" id="ga22d17ebca8556c49be5c22e706de1ab3"></a><!-- doxytag: member="hmac.h::av_hmac_calc" ref="ga22d17ebca8556c49be5c22e706de1ab3" args="(AVHMAC *ctx, const uint8_t *data, unsigned int len, const uint8_t *key, unsigned int keylen, uint8_t *out, unsigned int outlen)" -->
<div class="memitem">
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      <table class="memname">
        <tr>
          <td class="memname">int <a class="el" href="group__lavu__hmac.html#ga22d17ebca8556c49be5c22e706de1ab3">av_hmac_calc</a> </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *&#160;</td>
          <td class="paramname"><em>ctx</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint8_t *&#160;</td>
          <td class="paramname"><em>data</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>len</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint8_t *&#160;</td>
          <td class="paramname"><em>key</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>keylen</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint8_t *&#160;</td>
          <td class="paramname"><em>out</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&#160;</td>
          <td class="paramname"><em>outlen</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Hash an array of data with a key. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
  <table class="params">
    <tr><td class="paramname">ctx</td><td>The HMAC context </td></tr>
    <tr><td class="paramname">data</td><td>The data to hash </td></tr>
    <tr><td class="paramname">len</td><td>The length of the data, in bytes </td></tr>
    <tr><td class="paramname">key</td><td>The authentication key </td></tr>
    <tr><td class="paramname">keylen</td><td>The length of the key, in bytes </td></tr>
    <tr><td class="paramname">out</td><td>The output buffer to write the digest into </td></tr>
    <tr><td class="paramname">outlen</td><td>The length of the out buffer, in bytes </td></tr>
  </table>
  </dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The number of bytes written to out, or a negative error code. </dd></dl>

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