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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>OCSP_request_add1_nonce</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </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="#return_values">RETURN VALUES</a></li> <li><a href="#notes">NOTES</a></li> <li><a href="#see_also">SEE ALSO</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>OCSP_request_add1_nonce, OCSP_basic_add1_nonce, OCSP_check_nonce, OCSP_copy_nonce - OCSP nonce functions</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/ocsp.h></pre> <pre> int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len); int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len); int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req); int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *resp);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>OCSP_request_add1_nonce() adds a nonce of value <strong>val</strong> and length <strong>len</strong> to OCSP request <strong>req</strong>. If <strong>val</strong> is <strong>NULL</strong> a random nonce is used. If <strong>len</strong> is zero or negative a default length will be used (currently 16 bytes).</p> <p>OCSP_basic_add1_nonce() is identical to OCSP_request_add1_nonce() except it adds a nonce to OCSP basic response <strong>resp</strong>.</p> <p><code>OCSP_check_nonce()</code> compares the nonce value in <strong>req</strong> and <strong>resp</strong>.</p> <p><code>OCSP_copy_nonce()</code> copies any nonce value present in <strong>req</strong> to <strong>resp</strong>.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>OCSP_request_add1_nonce() and OCSP_basic_add1_nonce() return 1 for success and 0 for failure.</p> <p><code>OCSP_copy_nonce()</code> returns 1 if a nonce was successfully copied, 2 if no nonce was present in <strong>req</strong> and 0 if an error occurred.</p> <p><code>OCSP_check_nonce()</code> returns the result of the nonce comparison between <strong>req</strong> and <strong>resp</strong>. The return value indicates the result of the comparison. If nonces are present and equal 1 is returned. If the nonces are absent 2 is returned. If a nonce is present in the response only 3 is returned. If nonces are present and unequal 0 is returned. If the nonce is present in the request only then -1 is returned.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>For most purposes the nonce value in a request is set to a random value so the <strong>val</strong> parameter in OCSP_request_add1_nonce() is usually NULL.</p> <p>An OCSP nonce is typically added to an OCSP request to thwart replay attacks by checking the same nonce value appears in the response.</p> <p>Some responders may include a nonce in all responses even if one is not supplied.</p> <p>Some responders cache OCSP responses and do not sign each response for performance reasons. As a result they do not support nonces.</p> <p>The return values of <code>OCSP_check_nonce()</code> can be checked to cover each case. A positive return value effectively indicates success: nonces are both present and match, both absent or present in the response only. A nonzero return additionally covers the case where the nonce is present in the request only: this will happen if the responder doesn't support nonces. A zero return value indicates present and mismatched nonces: this should be treated as an error condition.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>crypto(7)</em>, <em>OCSP_cert_to_id(3)</em>, <em>OCSP_REQUEST_new(3)</em>, <em>OCSP_resp_find_status(3)</em>, <em>OCSP_response_status(3)</em>, <em>OCSP_sendreq_new(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (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>