107 lines
3.8 KiB
HTML
Executable File
107 lines
3.8 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>DSA_sign</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#conforming_to">CONFORMING TO</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/dsa.h></pre>
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<pre>
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int DSA_sign(int type, const unsigned char *dgst, int len,
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unsigned char *sigret, unsigned int *siglen, DSA *dsa);</pre>
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<pre>
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int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp);</pre>
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<pre>
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int DSA_verify(int type, const unsigned char *dgst, int len,
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unsigned char *sigbuf, int siglen, DSA *dsa);</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p><code>DSA_sign()</code> computes a digital signature on the <strong>len</strong> byte message
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digest <strong>dgst</strong> using the private key <strong>dsa</strong> and places its ASN.1 DER
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encoding at <strong>sigret</strong>. The length of the signature is places in
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*<strong>siglen</strong>. <strong>sigret</strong> must point to DSA_size(<strong>dsa</strong>) bytes of memory.</p>
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<p><code>DSA_sign_setup()</code> is defined only for backward binary compatibility and
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should not be used.
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Since OpenSSL 1.1.0 the DSA type is opaque and the output of
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<code>DSA_sign_setup()</code> cannot be used anyway: calling this function will only
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cause overhead, and does not affect the actual signature
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(pre-)computation.</p>
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<p><code>DSA_verify()</code> verifies that the signature <strong>sigbuf</strong> of size <strong>siglen</strong>
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matches a given message digest <strong>dgst</strong> of size <strong>len</strong>.
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<strong>dsa</strong> is the signer's public key.</p>
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<p>The <strong>type</strong> parameter is ignored.</p>
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<p>The random generator must be seeded when <code>DSA_sign()</code> (or DSA_sign_setup())
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is called.
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If the automatic seeding or reseeding of the OpenSSL CSPRNG fails due to
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external circumstances (see <em>RAND(7)</em>), the operation will fail.</p>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p><code>DSA_sign()</code> and <code>DSA_sign_setup()</code> return 1 on success, 0 on error.
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<code>DSA_verify()</code> returns 1 for a valid signature, 0 for an incorrect
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signature and -1 on error. The error codes can be obtained by
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<em>ERR_get_error(3)</em>.</p>
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<p>
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</p>
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<hr />
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<h1><a name="conforming_to">CONFORMING TO</a></h1>
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<p>US Federal Information Processing Standard FIPS 186 (Digital Signature
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Standard, DSS), ANSI X9.30</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>DSA_new(3)</em>, <em>ERR_get_error(3)</em>, <em>RAND_bytes(3)</em>,
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<em>DSA_do_sign(3)</em>,
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<em>RAND(7)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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