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129 .\" ========================================================================
131 .IX Title "OCSP_REQUEST_ADD1_NONCE 3"
132 .TH OCSP_REQUEST_ADD1_NONCE 3 "2018-11-20" "1.1.1a" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 OCSP_request_add1_nonce, OCSP_basic_add1_nonce, OCSP_check_nonce, OCSP_copy_nonce \- OCSP nonce functions
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ocsp.h>
144 \& int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len);
145 \& int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len);
146 \& int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req);
147 \& int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *resp);
150 .IX Header "DESCRIPTION"
151 \&\fIOCSP_request_add1_nonce()\fR adds a nonce of value \fBval\fR and length \fBlen\fR to
152 \&\s-1OCSP\s0 request \fBreq\fR. If \fBval\fR is \fB\s-1NULL\s0\fR a random nonce is used. If \fBlen\fR
153 is zero or negative a default length will be used (currently 16 bytes).
155 \&\fIOCSP_basic_add1_nonce()\fR is identical to \fIOCSP_request_add1_nonce()\fR except
156 it adds a nonce to \s-1OCSP\s0 basic response \fBresp\fR.
158 \&\fIOCSP_check_nonce()\fR compares the nonce value in \fBreq\fR and \fBresp\fR.
160 \&\fIOCSP_copy_nonce()\fR copys any nonce value present in \fBreq\fR to \fBresp\fR.
162 .IX Header "RETURN VALUES"
163 \&\fIOCSP_request_add1_nonce()\fR and \fIOCSP_basic_add1_nonce()\fR return 1 for success
166 \&\fIOCSP_copy_nonce()\fR returns 1 if a nonce was successfully copied, 2 if no nonce
167 was present in \fBreq\fR and 0 if an error occurred.
169 \&\fIOCSP_check_nonce()\fR returns the result of the nonce comparison between \fBreq\fR
170 and \fBresp\fR. The return value indicates the result of the comparison. If
171 nonces are present and equal 1 is returned. If the nonces are absent 2 is
172 returned. If a nonce is present in the response only 3 is returned. If nonces
173 are present and unequal 0 is returned. If the nonce is present in the request
174 only then \-1 is returned.
177 For most purposes the nonce value in a request is set to a random value so
178 the \fBval\fR parameter in \fIOCSP_request_add1_nonce()\fR is usually \s-1NULL.\s0
180 An \s-1OCSP\s0 nonce is typically added to an \s-1OCSP\s0 request to thwart replay attacks
181 by checking the same nonce value appears in the response.
183 Some responders may include a nonce in all responses even if one is not
186 Some responders cache \s-1OCSP\s0 responses and do not sign each response for
187 performance reasons. As a result they do not support nonces.
189 The return values of \fIOCSP_check_nonce()\fR can be checked to cover each case. A
190 positive return value effectively indicates success: nonces are both present
191 and match, both absent or present in the response only. A non-zero return
192 additionally covers the case where the nonce is present in the request only:
193 this will happen if the responder doesn't support nonces. A zero return value
194 indicates present and mismatched nonces: this should be treated as an error
197 .IX Header "SEE ALSO"
199 \&\fIOCSP_cert_to_id\fR\|(3),
200 \&\fIOCSP_REQUEST_new\fR\|(3),
201 \&\fIOCSP_resp_find_status\fR\|(3),
202 \&\fIOCSP_response_status\fR\|(3),
203 \&\fIOCSP_sendreq_new\fR\|(3)
205 .IX Header "COPYRIGHT"
206 Copyright 2015\-2016 The OpenSSL Project Authors. All Rights Reserved.
208 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
209 this file except in compliance with the License. You can obtain a copy
210 in the file \s-1LICENSE\s0 in the source distribution or at
211 <https://www.openssl.org/source/license.html>.