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<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>RSA_sign</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rev="made" href="mailto:" />
</head>
<body>
<ul id="index">
<li><a href="#NAME">NAME</a></li>
<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
<li><a href="#CONFORMING-TO">CONFORMING TO</a></li>
<li><a href="#SEE-ALSO">SEE ALSO</a></li>
<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>
<h1 id="NAME">NAME</h1>
<p>RSA_sign, RSA_verify - RSA signatures</p>
<h1 id="SYNOPSIS">SYNOPSIS</h1>
<pre><code> #include &lt;openssl/rsa.h&gt;
int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
unsigned char *sigret, unsigned int *siglen, RSA *rsa);
int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
unsigned char *sigbuf, unsigned int siglen, RSA *rsa);</code></pre>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>RSA_sign() signs the message digest <b>m</b> of size <b>m_len</b> using the private key <b>rsa</b> using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It stores the signature in <b>sigret</b> and the signature size in <b>siglen</b>. <b>sigret</b> must point to RSA_size(<b>rsa</b>) bytes of memory. Note that PKCS #1 adds meta-data, placing limits on the size of the key that can be used. See <a href="../man3/RSA_private_encrypt.html">RSA_private_encrypt(3)</a> for lower-level operations.</p>
<p><b>type</b> denotes the message digest algorithm that was used to generate <b>m</b>. If <b>type</b> is <b>NID_md5_sha1</b>, an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding and no algorithm identifier) is created.</p>
<p>RSA_verify() verifies that the signature <b>sigbuf</b> of size <b>siglen</b> matches a given message digest <b>m</b> of size <b>m_len</b>. <b>type</b> denotes the message digest algorithm that was used to generate the signature. <b>rsa</b> is the signer&#39;s public key.</p>
<h1 id="RETURN-VALUES">RETURN VALUES</h1>
<p>RSA_sign() returns 1 on success. RSA_verify() returns 1 on successful verification.</p>
<p>The error codes can be obtained by <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>.</p>
<h1 id="CONFORMING-TO">CONFORMING TO</h1>
<p>SSL, PKCS #1 v2.0</p>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/RSA_private_encrypt.html">RSA_private_encrypt(3)</a>, <a href="../man3/RSA_public_decrypt.html">RSA_public_decrypt(3)</a></p>
<h1 id="COPYRIGHT">COPYRIGHT</h1>
<p>Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
</body>
</html>