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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>kcapi_cipher_dec_aes_cbc</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Linux Kernel Crypto API User Space Interface Library"><link rel="up" href="ch03s04.html" title="Symmetric Cipher API - Convenience"><link rel="prev" href="API-kcapi-cipher-enc-aes-cbc.html" title="kcapi_cipher_enc_aes_cbc"><link rel="next" href="API-kcapi-cipher-enc-aes-ctr.html" title="kcapi_cipher_enc_aes_ctr"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">kcapi_cipher_dec_aes_cbc</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-kcapi-cipher-enc-aes-cbc.html">Prev</a> </td><th width="60%" align="center">Symmetric Cipher API - Convenience</th><td width="20%" align="right"> <a accesskey="n" href="API-kcapi-cipher-enc-aes-ctr.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-kcapi-cipher-dec-aes-cbc"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>kcapi_cipher_dec_aes_cbc —
Convenience function for AES CBC decryption
</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int32_t <b class="fsfunc">kcapi_cipher_dec_aes_cbc </b>(</code></td><td>const uint8_t * <var class="pdparam">key</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">keylen</var>, </td></tr><tr><td> </td><td>const uint8_t * <var class="pdparam">in</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">inlen</var>, </td></tr><tr><td> </td><td>const uint8_t * <var class="pdparam">iv</var>, </td></tr><tr><td> </td><td>uint8_t * <var class="pdparam">out</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">outlen</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm878"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>key</code></em></span></dt><dd><p>
[in] key buffer
</p></dd><dt><span class="term"><em class="parameter"><code>keylen</code></em></span></dt><dd><p>
[in] length of key buffer
</p></dd><dt><span class="term"><em class="parameter"><code>in</code></em></span></dt><dd><p>
[in] ciphertext data buffer
</p></dd><dt><span class="term"><em class="parameter"><code>inlen</code></em></span></dt><dd><p>
[in] length of in buffer
</p></dd><dt><span class="term"><em class="parameter"><code>iv</code></em></span></dt><dd><p>
[in] IV to be used for cipher operation
</p></dd><dt><span class="term"><em class="parameter"><code>out</code></em></span></dt><dd><p>
[out] plaintext data buffer
</p></dd><dt><span class="term"><em class="parameter"><code>outlen</code></em></span></dt><dd><p>
[in] length of out buffer
</p></dd></dl></div></div><div class="refsect1"><a name="idm916"></a><h2>Description</h2><p>
The convenience function performs an AES CBC decryption operation
using the provided key, the given input buffer and the given IV.
The output is stored in the out buffer.
</p><p>
Note, AES CBC requires an input data that is a multiple of 16 bytes.
If you have data that is not guaranteed to be multiples of 16 bytes, either
add zero bytes at the end of the buffer to pad it up to a multiple of 16
bytes. Otherwise, the CTR mode encryption operation may be usable.
</p><p>
The output buffer must be at least as large as the input buffer.
</p><p>
The IV must be exactly 16 bytes in size.
</p><p>
The AES type (AES-128, AES-192 or AES-256) is determined by the size
of the given key. If the key is 16 bytes long, AES-128 is used. A 24 byte
key implies AES-192 and a 32 byte key implies AES-256.
</p><p>
<em class="parameter"><code>return</code></em> number of bytes generated upon success;
a negative errno-style error code if an error occurred
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