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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>kcapi_akcipher_setkey</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="ch03s17.html" title="Asymmetric Cipher API - Generic"><link rel="prev" href="API-kcapi-akcipher-destroy.html" title="kcapi_akcipher_destroy"><link rel="next" href="API-kcapi-akcipher-setpubkey.html" title="kcapi_akcipher_setpubkey"></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_setkey</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-kcapi-akcipher-destroy.html">Prev</a> </td><th width="60%" align="center">Asymmetric Cipher API - Generic</th><td width="20%" align="right"> <a accesskey="n" href="API-kcapi-akcipher-setpubkey.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-kcapi-akcipher-setkey"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>kcapi_akcipher_setkey — 
  set the private key for the cipher handle
 </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">kcapi_akcipher_setkey </b>(</code></td><td>struct kcapi_handle * <var class="pdparam">handle</var>, </td></tr><tr><td> </td><td>const uint8_t * <var class="pdparam">key</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">keylen</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm4205"></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>key</code></em></span></dt><dd><p>
     [in] key buffer in DER format
    </p></dd><dt><span class="term"><em class="parameter"><code>keylen</code></em></span></dt><dd><p>
     [in] length of key buffer
    </p></dd></dl></div></div><div class="refsect1"><a name="idm4223"></a><h2>Description</h2><p>
   With this function, the caller sets the key for subsequent cipher operations.
   </p><p>

   The key must be in DER format as follows
   </p><p>

   SEQUENCE {
   version         INTEGER,
   n               INTEGER ({ rsa_get_n }),
   e               INTEGER ({ rsa_get_e }),
   d               INTEGER ({ rsa_get_d }),
   prime1          INTEGER,
   prime2          INTEGER,
   exponent1       INTEGER,
   exponent2       INTEGER,
   coefficient     INTEGER
   }
   </p><p>

   After the caller provided the key, the caller may securely destroy the key
   as it is now maintained by the kernel.
   </p><p>

   <em class="parameter"><code>return</code></em> upon success the value of the maximum size for the asymmetric
   operation is returned (e.g. the modulus size);
   a negative errno-style error code if an error occurred
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