148 lines
4.9 KiB
HTML
Executable File
148 lines
4.9 KiB
HTML
Executable File
<?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>EVP_PKEY_verify</title>
|
|
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
|
|
<link rev="made" href="mailto:root@localhost" />
|
|
</head>
|
|
|
|
<body style="background-color: white">
|
|
|
|
|
|
<!-- INDEX BEGIN -->
|
|
<div name="index">
|
|
<p><a name="__index__"></a></p>
|
|
|
|
<ul>
|
|
|
|
<li><a href="#name">NAME</a></li>
|
|
<li><a href="#synopsis">SYNOPSIS</a></li>
|
|
<li><a href="#description">DESCRIPTION</a></li>
|
|
<li><a href="#notes">NOTES</a></li>
|
|
<li><a href="#return_values">RETURN VALUES</a></li>
|
|
<li><a href="#examples">EXAMPLES</a></li>
|
|
<li><a href="#see_also">SEE ALSO</a></li>
|
|
<li><a href="#history">HISTORY</a></li>
|
|
<li><a href="#copyright">COPYRIGHT</a></li>
|
|
</ul>
|
|
|
|
<hr name="index" />
|
|
</div>
|
|
<!-- INDEX END -->
|
|
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="name">NAME</a></h1>
|
|
<p>EVP_PKEY_verify_init, EVP_PKEY_verify
|
|
- signature verification using a public key algorithm</p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="synopsis">SYNOPSIS</a></h1>
|
|
<pre>
|
|
#include <openssl/evp.h></pre>
|
|
<pre>
|
|
int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx);
|
|
int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
|
|
const unsigned char *sig, size_t siglen,
|
|
const unsigned char *tbs, size_t tbslen);</pre>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="description">DESCRIPTION</a></h1>
|
|
<p><code>EVP_PKEY_verify_init()</code> initializes a public key algorithm context <em>ctx</em> for
|
|
signing using the algorithm given when the context was created
|
|
using <em>EVP_PKEY_CTX_new(3)</em> or variants thereof. The algorithm is used to
|
|
fetch a <strong>EVP_SIGNATURE</strong> method implicitly, see <em>provider(7)/Implicit fetch</em>
|
|
for more information about implict fetches.</p>
|
|
<p>The <code>EVP_PKEY_verify()</code> function performs a public key verification operation
|
|
using <em>ctx</em>. The signature is specified using the <em>sig</em> and
|
|
<em>siglen</em> parameters. The verified data (i.e. the data believed originally
|
|
signed) is specified using the <em>tbs</em> and <em>tbslen</em> parameters.</p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="notes">NOTES</a></h1>
|
|
<p>After the call to <code>EVP_PKEY_verify_init()</code> algorithm specific control
|
|
operations can be performed to set any appropriate parameters for the
|
|
operation.</p>
|
|
<p>The function <code>EVP_PKEY_verify()</code> can be called more than once on the same
|
|
context if several operations are performed using the same parameters.</p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="return_values">RETURN VALUES</a></h1>
|
|
<p><code>EVP_PKEY_verify_init()</code> and <code>EVP_PKEY_verify()</code> return 1 if the verification was
|
|
successful and 0 if it failed. Unlike other functions the return value 0 from
|
|
<code>EVP_PKEY_verify()</code> only indicates that the signature did not verify
|
|
successfully (that is tbs did not match the original data or the signature was
|
|
of invalid form) it is not an indication of a more serious error.</p>
|
|
<p>A negative value indicates an error other that signature verification failure.
|
|
In particular a return value of -2 indicates the operation is not supported by
|
|
the public key algorithm.</p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="examples">EXAMPLES</a></h1>
|
|
<p>Verify signature using PKCS#1 and SHA256 digest:</p>
|
|
<pre>
|
|
#include <openssl/evp.h>
|
|
#include <openssl/rsa.h></pre>
|
|
<pre>
|
|
EVP_PKEY_CTX *ctx;
|
|
unsigned char *md, *sig;
|
|
size_t mdlen, siglen;
|
|
EVP_PKEY *verify_key;</pre>
|
|
<pre>
|
|
/*
|
|
* NB: assumes verify_key, sig, siglen md and mdlen are already set up
|
|
* and that verify_key is an RSA public key
|
|
*/
|
|
ctx = EVP_PKEY_CTX_new(verify_key, NULL /* no engine */);
|
|
if (!ctx)
|
|
/* Error occurred */
|
|
if (EVP_PKEY_verify_init(ctx) <= 0)
|
|
/* Error */
|
|
if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
|
|
/* Error */
|
|
if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
|
|
/* Error */</pre>
|
|
<pre>
|
|
/* Perform operation */
|
|
ret = EVP_PKEY_verify(ctx, sig, siglen, md, mdlen);</pre>
|
|
<pre>
|
|
/*
|
|
* ret == 1 indicates success, 0 verify failure and < 0 for some
|
|
* other error.
|
|
*/</pre>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="see_also">SEE ALSO</a></h1>
|
|
<p><em>EVP_PKEY_CTX_new(3)</em>,
|
|
<em>EVP_PKEY_encrypt(3)</em>,
|
|
<em>EVP_PKEY_decrypt(3)</em>,
|
|
<em>EVP_PKEY_sign(3)</em>,
|
|
<em>EVP_PKEY_verify_recover(3)</em>,
|
|
<em>EVP_PKEY_derive(3)</em></p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="history">HISTORY</a></h1>
|
|
<p>These functions were added in OpenSSL 1.0.0.</p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="copyright">COPYRIGHT</a></h1>
|
|
<p>Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
|
|
<p>Licensed under the Apache License 2.0 (the "License"). 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>
|