115 lines
4.6 KiB
HTML
Executable File
115 lines
4.6 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>OCSP_request_add1_nonce</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="#notes">NOTES</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>OCSP_request_add1_nonce, OCSP_basic_add1_nonce, OCSP_check_nonce, OCSP_copy_nonce - OCSP nonce functions</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/ocsp.h></pre>
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<pre>
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int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len);
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int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len);
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int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req);
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int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *resp);</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>OCSP_request_add1_nonce() adds a nonce of value <strong>val</strong> and length <strong>len</strong> to
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OCSP request <strong>req</strong>. If <strong>val</strong> is <strong>NULL</strong> a random nonce is used. If <strong>len</strong>
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is zero or negative a default length will be used (currently 16 bytes).</p>
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<p>OCSP_basic_add1_nonce() is identical to OCSP_request_add1_nonce() except
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it adds a nonce to OCSP basic response <strong>resp</strong>.</p>
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<p><code>OCSP_check_nonce()</code> compares the nonce value in <strong>req</strong> and <strong>resp</strong>.</p>
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<p><code>OCSP_copy_nonce()</code> copies any nonce value present in <strong>req</strong> to <strong>resp</strong>.</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>OCSP_request_add1_nonce() and OCSP_basic_add1_nonce() return 1 for success
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and 0 for failure.</p>
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<p><code>OCSP_copy_nonce()</code> returns 1 if a nonce was successfully copied, 2 if no nonce
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was present in <strong>req</strong> and 0 if an error occurred.</p>
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<p><code>OCSP_check_nonce()</code> returns the result of the nonce comparison between <strong>req</strong>
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and <strong>resp</strong>. The return value indicates the result of the comparison. If
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nonces are present and equal 1 is returned. If the nonces are absent 2 is
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returned. If a nonce is present in the response only 3 is returned. If nonces
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are present and unequal 0 is returned. If the nonce is present in the request
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only then -1 is returned.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>For most purposes the nonce value in a request is set to a random value so
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the <strong>val</strong> parameter in OCSP_request_add1_nonce() is usually NULL.</p>
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<p>An OCSP nonce is typically added to an OCSP request to thwart replay attacks
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by checking the same nonce value appears in the response.</p>
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<p>Some responders may include a nonce in all responses even if one is not
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supplied.</p>
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<p>Some responders cache OCSP responses and do not sign each response for
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performance reasons. As a result they do not support nonces.</p>
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<p>The return values of <code>OCSP_check_nonce()</code> can be checked to cover each case. A
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positive return value effectively indicates success: nonces are both present
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and match, both absent or present in the response only. A nonzero return
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additionally covers the case where the nonce is present in the request only:
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this will happen if the responder doesn't support nonces. A zero return value
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indicates present and mismatched nonces: this should be treated as an error
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condition.</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>crypto(7)</em>,
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<em>OCSP_cert_to_id(3)</em>,
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<em>OCSP_REQUEST_new(3)</em>,
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<em>OCSP_resp_find_status(3)</em>,
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<em>OCSP_response_status(3)</em>,
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<em>OCSP_sendreq_new(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="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2015-2016 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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