1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>crypto_hash_update</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="ch05s09.html" title="Synchronous Message Digest API"><link rel="prev" href="API-crypto-hash-init.html" title="crypto_hash_init"><link rel="next" href="API-crypto-hash-final.html" title="crypto_hash_final"></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_hash_update</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-crypto-hash-init.html">Prev</a>&#160;</td><th width="60%" align="center">Synchronous Message Digest API</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-crypto-hash-final.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-crypto-hash-update"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>crypto_hash_update &#8212; 
2  add data to message digest for processing
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_hash_update </b>(</code></td><td>struct hash_desc * <var class="pdparam">desc</var>, </td></tr><tr><td>&#160;</td><td>struct scatterlist * <var class="pdparam">sg</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">nbytes</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1098012860"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>desc</code></em></span></dt><dd><p>
4     cipher request handle
5    </p></dd><dt><span class="term"><em class="parameter"><code>sg</code></em></span></dt><dd><p>
6     scatter / gather list pointing to the data to be added to the message
7     digest
8    </p></dd><dt><span class="term"><em class="parameter"><code>nbytes</code></em></span></dt><dd><p>
9     number of bytes to be processed from <em class="parameter"><code>sg</code></em>
10    </p></dd></dl></div></div><div class="refsect1"><a name="idp1098016796"></a><h2>Description</h2><p>
11   Updates the message digest state of the cipher handle pointed to by the
12   hash cipher request handle with the input data pointed to by the
13   scatter/gather list.
14</p></div><div class="refsect1"><a name="idp1098017548"></a><h2>Return</h2><p>
15   0 if the message digest update was successful; &lt; 0 if an error
16   occurred
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