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<p>The Cipher-based Message Authentication Code (CMAC) Mode for Authentication.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include "<a class="el" href="cipher_8h_source.html">mbedtls/cipher.h</a>"</code><br />
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Include dependency graph for cmac.h:</div>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structmbedtls__cmac__context__t.html">mbedtls_cmac_context_t</a></td></tr>
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Macros</h2></td></tr>
<tr class="memitem:ac1f7e31cddacee936b40c41e4eb525da"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#ac1f7e31cddacee936b40c41e4eb525da">MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED</a>   -0x007A</td></tr>
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<tr class="memitem:a5c776e34150416e27f28a6a03da68f0e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#a5c776e34150416e27f28a6a03da68f0e">MBEDTLS_AES_BLOCK_SIZE</a>   16</td></tr>
<tr class="separator:a5c776e34150416e27f28a6a03da68f0e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa884d76e1c27c156a788a4763f571c67"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#aa884d76e1c27c156a788a4763f571c67">MBEDTLS_DES3_BLOCK_SIZE</a>   8</td></tr>
<tr class="separator:aa884d76e1c27c156a788a4763f571c67"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:accb84fb7db8f619f0fdf8ef1ee7552af"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#accb84fb7db8f619f0fdf8ef1ee7552af">MBEDTLS_CIPHER_BLKSIZE_MAX</a>   8 /* The longest block used by CMAC is that of 3DES. */</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ae5835d528bbfec2ae2452ba4617469b8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#ae5835d528bbfec2ae2452ba4617469b8">mbedtls_cipher_cmac_starts</a> (<a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> *ctx, const unsigned char *key, size_t keybits)</td></tr>
<tr class="memdesc:ae5835d528bbfec2ae2452ba4617469b8"><td class="mdescLeft"> </td><td class="mdescRight">This function sets the CMAC key, and prepares to authenticate the input data. Must be called with an initialized cipher context. <a href="#ae5835d528bbfec2ae2452ba4617469b8">More...</a><br /></td></tr>
<tr class="separator:ae5835d528bbfec2ae2452ba4617469b8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a14441964606982e0a664a8bb48bddad6"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#a14441964606982e0a664a8bb48bddad6">mbedtls_cipher_cmac_update</a> (<a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> *ctx, const unsigned char *input, size_t ilen)</td></tr>
<tr class="memdesc:a14441964606982e0a664a8bb48bddad6"><td class="mdescLeft"> </td><td class="mdescRight">This function feeds an input buffer into an ongoing CMAC computation. <a href="#a14441964606982e0a664a8bb48bddad6">More...</a><br /></td></tr>
<tr class="separator:a14441964606982e0a664a8bb48bddad6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9adc5b4b09b40d41bb6554c8ecfa755d"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#a9adc5b4b09b40d41bb6554c8ecfa755d">mbedtls_cipher_cmac_finish</a> (<a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> *ctx, unsigned char *output)</td></tr>
<tr class="memdesc:a9adc5b4b09b40d41bb6554c8ecfa755d"><td class="mdescLeft"> </td><td class="mdescRight">This function finishes the CMAC operation, and writes the result to the output buffer. <a href="#a9adc5b4b09b40d41bb6554c8ecfa755d">More...</a><br /></td></tr>
<tr class="separator:a9adc5b4b09b40d41bb6554c8ecfa755d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a364af1a9ac845cbf21d7a64f1f43c71a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#a364af1a9ac845cbf21d7a64f1f43c71a">mbedtls_cipher_cmac_reset</a> (<a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> *ctx)</td></tr>
<tr class="memdesc:a364af1a9ac845cbf21d7a64f1f43c71a"><td class="mdescLeft"> </td><td class="mdescRight">This function prepares the authentication of another message with the same key as the previous CMAC operation. <a href="#a364af1a9ac845cbf21d7a64f1f43c71a">More...</a><br /></td></tr>
<tr class="separator:a364af1a9ac845cbf21d7a64f1f43c71a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af44bc935db9b27fbfe485936b5ad99ed"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="cmac_8h.html#af44bc935db9b27fbfe485936b5ad99ed">mbedtls_cipher_cmac</a> (const <a class="el" href="structmbedtls__cipher__info__t.html">mbedtls_cipher_info_t</a> *cipher_info, const unsigned char *key, size_t keylen, const unsigned char *input, size_t ilen, unsigned char *output)</td></tr>
<tr class="memdesc:af44bc935db9b27fbfe485936b5ad99ed"><td class="mdescLeft"> </td><td class="mdescRight">This function calculates the full generic CMAC on the input buffer with the provided key. <a href="#af44bc935db9b27fbfe485936b5ad99ed">More...</a><br /></td></tr>
<tr class="separator:af44bc935db9b27fbfe485936b5ad99ed"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The Cipher-based Message Authentication Code (CMAC) Mode for Authentication. </p>
<p class="definition">Definition in file <a class="el" href="cmac_8h_source.html">cmac.h</a>.</p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="a5c776e34150416e27f28a6a03da68f0e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5c776e34150416e27f28a6a03da68f0e">◆ </a></span>MBEDTLS_AES_BLOCK_SIZE</h2>
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<td class="memname">#define MBEDTLS_AES_BLOCK_SIZE   16</td>
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<p class="definition">Definition at line <a class="el" href="cmac_8h_source.html#l00037">37</a> of file <a class="el" href="cmac_8h_source.html">cmac.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#accb84fb7db8f619f0fdf8ef1ee7552af">◆ </a></span>MBEDTLS_CIPHER_BLKSIZE_MAX</h2>
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<td class="memname">#define MBEDTLS_CIPHER_BLKSIZE_MAX   8 /* The longest block used by CMAC is that of 3DES. */</td>
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<p class="definition">Definition at line <a class="el" href="cmac_8h_source.html#l00043">43</a> of file <a class="el" href="cmac_8h_source.html">cmac.h</a>.</p>
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<a id="aa884d76e1c27c156a788a4763f571c67"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa884d76e1c27c156a788a4763f571c67">◆ </a></span>MBEDTLS_DES3_BLOCK_SIZE</h2>
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<td class="memname">#define MBEDTLS_DES3_BLOCK_SIZE   8</td>
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<p class="definition">Definition at line <a class="el" href="cmac_8h_source.html#l00038">38</a> of file <a class="el" href="cmac_8h_source.html">cmac.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac1f7e31cddacee936b40c41e4eb525da">◆ </a></span>MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED</h2>
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<td class="memname">#define MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED   -0x007A</td>
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<p>CMAC hardware accelerator failed. </p>
<p class="definition">Definition at line <a class="el" href="cmac_8h_source.html#l00035">35</a> of file <a class="el" href="cmac_8h_source.html">cmac.h</a>.</p>
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<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#af44bc935db9b27fbfe485936b5ad99ed">◆ </a></span>mbedtls_cipher_cmac()</h2>
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<td class="memname">int mbedtls_cipher_cmac </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structmbedtls__cipher__info__t.html">mbedtls_cipher_info_t</a> * </td>
<td class="paramname"><em>cipher_info</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>keylen</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>input</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>ilen</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>output</em> </td>
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<td>)</td>
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<p>This function calculates the full generic CMAC on the input buffer with the provided key. </p>
<p>The function allocates the context, performs the calculation, and frees the context.</p>
<p>The CMAC result is calculated as output = generic CMAC(cmac key, input buffer).</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">cipher_info</td><td>The cipher information. </td></tr>
<tr><td class="paramname">key</td><td>The CMAC key. </td></tr>
<tr><td class="paramname">keylen</td><td>The length of the CMAC key in bits. </td></tr>
<tr><td class="paramname">input</td><td>The buffer holding the input data. </td></tr>
<tr><td class="paramname">ilen</td><td>The length of the input data. </td></tr>
<tr><td class="paramname">output</td><td>The buffer for the generic CMAC result.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or <a class="el" href="md_8h.html#aeeb355bf3d3d39a2a6ba50544139b9a7">MBEDTLS_ERR_MD_BAD_INPUT_DATA</a> if parameter verification fails. </dd></dl>
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</div>
<a id="a9adc5b4b09b40d41bb6554c8ecfa755d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9adc5b4b09b40d41bb6554c8ecfa755d">◆ </a></span>mbedtls_cipher_cmac_finish()</h2>
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<td class="memname">int mbedtls_cipher_cmac_finish </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>output</em> </td>
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<p>This function finishes the CMAC operation, and writes the result to the output buffer. </p>
<p>It is called after <a class="el" href="cmac_8h.html#a14441964606982e0a664a8bb48bddad6" title="This function feeds an input buffer into an ongoing CMAC computation. ">mbedtls_cipher_cmac_update()</a>. It can be followed by <a class="el" href="cmac_8h.html#a364af1a9ac845cbf21d7a64f1f43c71a" title="This function prepares the authentication of another message with the same key as the previous CMAC o...">mbedtls_cipher_cmac_reset()</a> and <a class="el" href="cmac_8h.html#a14441964606982e0a664a8bb48bddad6" title="This function feeds an input buffer into an ongoing CMAC computation. ">mbedtls_cipher_cmac_update()</a>, or <a class="el" href="cipher_8h.html#a903c4146b471207690988584b83854a9" title="This function frees and clears the cipher-specific context of ctx. Freeing ctx itself remains the res...">mbedtls_cipher_free()</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The cipher context used for the CMAC operation. </td></tr>
<tr><td class="paramname">output</td><td>The output buffer for the CMAC checksum result.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or <a class="el" href="md_8h.html#aeeb355bf3d3d39a2a6ba50544139b9a7">MBEDTLS_ERR_MD_BAD_INPUT_DATA</a> if parameter verification fails. </dd></dl>
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<a id="a364af1a9ac845cbf21d7a64f1f43c71a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a364af1a9ac845cbf21d7a64f1f43c71a">◆ </a></span>mbedtls_cipher_cmac_reset()</h2>
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<td class="memname">int mbedtls_cipher_cmac_reset </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
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<p>This function prepares the authentication of another message with the same key as the previous CMAC operation. </p>
<p>It is called after <a class="el" href="cmac_8h.html#a9adc5b4b09b40d41bb6554c8ecfa755d" title="This function finishes the CMAC operation, and writes the result to the output buffer. ">mbedtls_cipher_cmac_finish()</a> and before <a class="el" href="cmac_8h.html#a14441964606982e0a664a8bb48bddad6" title="This function feeds an input buffer into an ongoing CMAC computation. ">mbedtls_cipher_cmac_update()</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The cipher context used for the CMAC operation.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or <a class="el" href="md_8h.html#aeeb355bf3d3d39a2a6ba50544139b9a7">MBEDTLS_ERR_MD_BAD_INPUT_DATA</a> if parameter verification fails. </dd></dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae5835d528bbfec2ae2452ba4617469b8">◆ </a></span>mbedtls_cipher_cmac_starts()</h2>
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<td class="memname">int mbedtls_cipher_cmac_starts </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>keybits</em> </td>
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<p>This function sets the CMAC key, and prepares to authenticate the input data. Must be called with an initialized cipher context. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The cipher context used for the CMAC operation, initialized as one of the following types:<ul>
<li>
MBEDTLS_CIPHER_AES_128_ECB </li>
<li>
MBEDTLS_CIPHER_AES_192_ECB </li>
<li>
MBEDTLS_CIPHER_AES_256_ECB </li>
<li>
MBEDTLS_CIPHER_DES_EDE3_ECB</li>
</ul>
</td></tr>
<tr><td class="paramname">key</td><td>The CMAC key. </td></tr>
<tr><td class="paramname">keybits</td><td>The length of the CMAC key in bits. Must be supported by the cipher.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or a cipher-specific error code. </dd></dl>
</div>
</div>
<a id="a14441964606982e0a664a8bb48bddad6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a14441964606982e0a664a8bb48bddad6">◆ </a></span>mbedtls_cipher_cmac_update()</h2>
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<td class="memname">int mbedtls_cipher_cmac_update </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__cipher__context__t.html">mbedtls_cipher_context_t</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>input</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>ilen</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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</div><div class="memdoc">
<p>This function feeds an input buffer into an ongoing CMAC computation. </p>
<p>It is called between <a class="el" href="cmac_8h.html#ae5835d528bbfec2ae2452ba4617469b8" title="This function sets the CMAC key, and prepares to authenticate the input data. Must be called with an ...">mbedtls_cipher_cmac_starts()</a> or <a class="el" href="cmac_8h.html#a364af1a9ac845cbf21d7a64f1f43c71a" title="This function prepares the authentication of another message with the same key as the previous CMAC o...">mbedtls_cipher_cmac_reset()</a>, and <a class="el" href="cmac_8h.html#a9adc5b4b09b40d41bb6554c8ecfa755d" title="This function finishes the CMAC operation, and writes the result to the output buffer. ">mbedtls_cipher_cmac_finish()</a>. Can be called repeatedly.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The cipher context used for the CMAC operation. </td></tr>
<tr><td class="paramname">input</td><td>The buffer holding the input data. </td></tr>
<tr><td class="paramname">ilen</td><td>The length of the input data.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or <a class="el" href="md_8h.html#aeeb355bf3d3d39a2a6ba50544139b9a7">MBEDTLS_ERR_MD_BAD_INPUT_DATA</a> if parameter verification fails. </dd></dl>
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