1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>crypto_blkcipher_setkey</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Kernel Crypto API"><link rel="up" href="ch05s07.html" title="Synchronous Block Cipher API"><link rel="prev" href="API-crypto-blkcipher-blocksize.html" title="crypto_blkcipher_blocksize"><link rel="next" href="API-crypto-blkcipher-encrypt.html" title="crypto_blkcipher_encrypt"></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">crypto_blkcipher_setkey</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-crypto-blkcipher-blocksize.html">Prev</a>&#160;</td><th width="60%" align="center">Synchronous Block Cipher API</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-crypto-blkcipher-encrypt.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-crypto-blkcipher-setkey"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>crypto_blkcipher_setkey &#8212; 
2  set key for cipher
3 </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">int <b class="fsfunc">crypto_blkcipher_setkey </b>(</code></td><td>struct crypto_blkcipher * <var class="pdparam">tfm</var>, </td></tr><tr><td>&#160;</td><td>const u8 * <var class="pdparam">key</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">keylen</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1097821444"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>tfm</code></em></span></dt><dd><p>
4     cipher handle
5    </p></dd><dt><span class="term"><em class="parameter"><code>key</code></em></span></dt><dd><p>
6     buffer holding the key
7    </p></dd><dt><span class="term"><em class="parameter"><code>keylen</code></em></span></dt><dd><p>
8     length of the key in bytes
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1097824964"></a><h2>Description</h2><p>
10   The caller provided key is set for the block cipher referenced by the cipher
11   handle.
12   </p><p>
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14   Note, the key length determines the cipher type. Many block ciphers implement
15   different cipher modes depending on the key size, such as AES-128 vs AES-192
16   vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
17   is performed.
18</p></div><div class="refsect1"><a name="idp1097826036"></a><h2>Return</h2><p>
19   0 if the setting of the key was successful; &lt; 0 if an error occurred
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