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<div class="title">libavutil/hmac.h</div> </div>
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<a href="hmac_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2012 Martin Storsjo</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * This file is part of FFmpeg.</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span>
<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00008"></a>00008 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00009"></a>00009 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span>
<a name="l00012"></a>00012 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00014"></a>00014 <span class="comment"> * Lesser General Public License for more details.</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<a name="l00017"></a>00017 <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span>
<a name="l00018"></a>00018 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#ifndef AVUTIL_HMAC_H</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_HMAC_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <stdint.h></span>
<a name="l00025"></a>00025 <span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment">/**</span>
<a name="l00027"></a>00027 <span class="comment"> * @defgroup lavu_hmac HMAC</span>
<a name="l00028"></a>00028 <span class="comment"> * @ingroup lavu_crypto</span>
<a name="l00029"></a>00029 <span class="comment"> * @{</span>
<a name="l00030"></a>00030 <span class="comment"> */</span>
<a name="l00031"></a>00031
<a name="l00032"></a><a class="code" href="group__lavu__hmac.html#gaec34f18155d20236c9f39961bb58f7d4">00032</a> <span class="keyword">enum</span> <a class="code" href="group__lavu__hmac.html#gaec34f18155d20236c9f39961bb58f7d4">AVHMACType</a> {
<a name="l00033"></a><a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a063ecd7e758d4abcd438aba0b9708c7a">00033</a> <a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a063ecd7e758d4abcd438aba0b9708c7a">AV_HMAC_MD5</a>,
<a name="l00034"></a><a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a421f7f38b635e8d5ef1cc45d1867d5a7">00034</a> <a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a421f7f38b635e8d5ef1cc45d1867d5a7">AV_HMAC_SHA1</a>,
<a name="l00035"></a><a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a283c3d421f8279ec3530d0bd0cb56313">00035</a> <a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a283c3d421f8279ec3530d0bd0cb56313">AV_HMAC_SHA224</a> = 10,
<a name="l00036"></a><a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a2f0a1a712c6e85b5149baa0780dcda4c">00036</a> <a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a2f0a1a712c6e85b5149baa0780dcda4c">AV_HMAC_SHA256</a>,
<a name="l00037"></a><a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a268dfcdccbe89e48a662989087728ff7">00037</a> <a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a268dfcdccbe89e48a662989087728ff7">AV_HMAC_SHA384</a>,
<a name="l00038"></a><a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a811a3754bdc32d9e258c6504759a6608">00038</a> <a class="code" href="group__lavu__hmac.html#ggaec34f18155d20236c9f39961bb58f7d4a811a3754bdc32d9e258c6504759a6608">AV_HMAC_SHA512</a>,
<a name="l00039"></a>00039 };
<a name="l00040"></a>00040
<a name="l00041"></a><a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">00041</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> <a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a>;
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment">/**</span>
<a name="l00044"></a>00044 <span class="comment"> * Allocate an AVHMAC context.</span>
<a name="l00045"></a>00045 <span class="comment"> * @param type The hash function used for the HMAC.</span>
<a name="l00046"></a>00046 <span class="comment"> */</span>
<a name="l00047"></a>00047 <a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *<a class="code" href="group__lavu__hmac.html#gaae6685287d6645eb1be86525ecee17ae" title="Allocate an AVHMAC context.">av_hmac_alloc</a>(<span class="keyword">enum</span> <a class="code" href="group__lavu__hmac.html#gaec34f18155d20236c9f39961bb58f7d4">AVHMACType</a> type);
<a name="l00048"></a>00048 <span class="comment"></span>
<a name="l00049"></a>00049 <span class="comment">/**</span>
<a name="l00050"></a>00050 <span class="comment"> * Free an AVHMAC context.</span>
<a name="l00051"></a>00051 <span class="comment"> * @param ctx The context to free, may be NULL</span>
<a name="l00052"></a>00052 <span class="comment"> */</span>
<a name="l00053"></a>00053 <span class="keywordtype">void</span> <a class="code" href="group__lavu__hmac.html#gaaa2951b832fdc7abed35a9112f7f1a02" title="Free an AVHMAC context.">av_hmac_free</a>(<a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx);
<a name="l00054"></a>00054 <span class="comment"></span>
<a name="l00055"></a>00055 <span class="comment">/**</span>
<a name="l00056"></a>00056 <span class="comment"> * Initialize an AVHMAC context with an authentication key.</span>
<a name="l00057"></a>00057 <span class="comment"> * @param ctx The HMAC context</span>
<a name="l00058"></a>00058 <span class="comment"> * @param key The authentication key</span>
<a name="l00059"></a>00059 <span class="comment"> * @param keylen The length of the key, in bytes</span>
<a name="l00060"></a>00060 <span class="comment"> */</span>
<a name="l00061"></a>00061 <span class="keywordtype">void</span> <a class="code" href="group__lavu__hmac.html#gae91a0c1f832c269006164b29df7e9aa8" title="Initialize an AVHMAC context with an authentication key.">av_hmac_init</a>(<a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, <span class="keyword">const</span> uint8_t *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylen);
<a name="l00062"></a>00062 <span class="comment"></span>
<a name="l00063"></a>00063 <span class="comment">/**</span>
<a name="l00064"></a>00064 <span class="comment"> * Hash data with the HMAC.</span>
<a name="l00065"></a>00065 <span class="comment"> * @param ctx The HMAC context</span>
<a name="l00066"></a>00066 <span class="comment"> * @param data The data to hash</span>
<a name="l00067"></a>00067 <span class="comment"> * @param len The length of the data, in bytes</span>
<a name="l00068"></a>00068 <span class="comment"> */</span>
<a name="l00069"></a>00069 <span class="keywordtype">void</span> <a class="code" href="group__lavu__hmac.html#ga4c3307cc9b1f331a15e999f8dacb90de" title="Hash data with the HMAC.">av_hmac_update</a>(<a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, <span class="keyword">const</span> uint8_t *data, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len);
<a name="l00070"></a>00070 <span class="comment"></span>
<a name="l00071"></a>00071 <span class="comment">/**</span>
<a name="l00072"></a>00072 <span class="comment"> * Finish hashing and output the HMAC digest.</span>
<a name="l00073"></a>00073 <span class="comment"> * @param ctx The HMAC context</span>
<a name="l00074"></a>00074 <span class="comment"> * @param out The output buffer to write the digest into</span>
<a name="l00075"></a>00075 <span class="comment"> * @param outlen The length of the out buffer, in bytes</span>
<a name="l00076"></a>00076 <span class="comment"> * @return The number of bytes written to out, or a negative error code.</span>
<a name="l00077"></a>00077 <span class="comment"> */</span>
<a name="l00078"></a>00078 <span class="keywordtype">int</span> <a class="code" href="group__lavu__hmac.html#ga02f0b343d9045500beef1f6b09c650cd" title="Finish hashing and output the HMAC digest.">av_hmac_final</a>(<a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, uint8_t *out, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> outlen);
<a name="l00079"></a>00079 <span class="comment"></span>
<a name="l00080"></a>00080 <span class="comment">/**</span>
<a name="l00081"></a>00081 <span class="comment"> * Hash an array of data with a key.</span>
<a name="l00082"></a>00082 <span class="comment"> * @param ctx The HMAC context</span>
<a name="l00083"></a>00083 <span class="comment"> * @param data The data to hash</span>
<a name="l00084"></a>00084 <span class="comment"> * @param len The length of the data, in bytes</span>
<a name="l00085"></a>00085 <span class="comment"> * @param key The authentication key</span>
<a name="l00086"></a>00086 <span class="comment"> * @param keylen The length of the key, in bytes</span>
<a name="l00087"></a>00087 <span class="comment"> * @param out The output buffer to write the digest into</span>
<a name="l00088"></a>00088 <span class="comment"> * @param outlen The length of the out buffer, in bytes</span>
<a name="l00089"></a>00089 <span class="comment"> * @return The number of bytes written to out, or a negative error code.</span>
<a name="l00090"></a>00090 <span class="comment"> */</span>
<a name="l00091"></a>00091 <span class="keywordtype">int</span> <a class="code" href="group__lavu__hmac.html#ga22d17ebca8556c49be5c22e706de1ab3" title="Hash an array of data with a key.">av_hmac_calc</a>(<a class="code" href="group__lavu__hmac.html#gad8c944f9437e65d8e8ebc526bdeee676">AVHMAC</a> *ctx, <span class="keyword">const</span> uint8_t *data, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len,
<a name="l00092"></a>00092 <span class="keyword">const</span> uint8_t *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylen,
<a name="l00093"></a>00093 uint8_t *out, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> outlen);
<a name="l00094"></a>00094 <span class="comment"></span>
<a name="l00095"></a>00095 <span class="comment">/**</span>
<a name="l00096"></a>00096 <span class="comment"> * @}</span>
<a name="l00097"></a>00097 <span class="comment"> */</span>
<a name="l00098"></a>00098
<a name="l00099"></a>00099 <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_HMAC_H */</span>
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