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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 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>kcapi_akcipher_stream_init_dec</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="ch03s20.html" title="Asymmetric Cipher API - Stream"><link rel="prev" href="API-kcapi-akcipher-stream-init-enc.html" title="kcapi_akcipher_stream_init_enc"><link rel="next" href="API-kcapi-akcipher-stream-init-sgn.html" title="kcapi_akcipher_stream_init_sgn"></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_akcipher_stream_init_dec</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-kcapi-akcipher-stream-init-enc.html">Prev</a> </td><th width="60%" align="center">Asymmetric Cipher API - Stream</th><td width="20%" align="right"> <a accesskey="n" href="API-kcapi-akcipher-stream-init-sgn.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-kcapi-akcipher-stream-init-dec"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>kcapi_akcipher_stream_init_dec —
start an decryption operation (stream)
</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_akcipher_stream_init_dec </b>(</code></td><td>struct kcapi_handle * <var class="pdparam">handle</var>, </td></tr><tr><td> </td><td>struct iovec * <var class="pdparam">iov</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">iovlen</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm4905"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>handle</code></em></span></dt><dd><p>
[in] cipher handle
</p></dd><dt><span class="term"><em class="parameter"><code>iov</code></em></span></dt><dd><p>
[in] scatter/gather list with data to be decrypted. This is the
pointer to the first iov entry if an array of iov entries is supplied.
See sendmsg(2) for details on how iov is to be used. This pointer may be
NULL if no data to be decrypted is available at the point of the call.
</p></dd><dt><span class="term"><em class="parameter"><code>iovlen</code></em></span></dt><dd><p>
[in] number of scatter/gather list elements. If iov is NULL,
this value must be zero.
</p></dd></dl></div></div><div class="refsect1"><a name="idm4923"></a><h2>Description</h2><p>
A stream decryption operation is started with this call. Multiple
successive <code class="function">kcapi_akcipher_stream_update</code> function calls can be invoked to
send more plaintext data to be decrypted. The last invocation to supply data
must be done with <code class="function">kcapi_akcipher_stream_update_last</code>. The kernel buffers the
input until <code class="function">kcapi_akcipher_stream_op</code> picks up the encrypted data. Once
plaintext is decrypted during the <code class="function">kcapi_cipher_stream_op</code> it is removed
from the kernel buffer.
</p><p>
The function calls of <code class="function">kcapi_akcipher_stream_update</code> and
<code class="function">kcapi_akcipher_stream_op</code> can be mixed, even by multiple threads of an
application.
</p><p>
<em class="parameter"><code>return</code></em> number of bytes sent to the kernel upon success;
a negative errno-style error code if an error occurred
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