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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" OCSP_request_add1_nonce, OCSP_basic_add1_nonce, OCSP_check_nonce, OCSP_copy_nonce \- OCSP nonce functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ocsp.h> \& \& 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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBOCSP_request_add1_nonce()\fR adds a nonce of value \fBval\fR and length \fBlen\fR to \&\s-1OCSP\s0 request \fBreq\fR. If \fBval\fR is \fB\s-1NULL\s0\fR a random nonce is used. If \fBlen\fR is zero or negative a default length will be used (currently 16 bytes). .PP \&\fBOCSP_basic_add1_nonce()\fR is identical to \fBOCSP_request_add1_nonce()\fR except it adds a nonce to \s-1OCSP\s0 basic response \fBresp\fR. .PP \&\fBOCSP_check_nonce()\fR compares the nonce value in \fBreq\fR and \fBresp\fR. .PP \&\fBOCSP_copy_nonce()\fR copies any nonce value present in \fBreq\fR to \fBresp\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBOCSP_request_add1_nonce()\fR and \fBOCSP_basic_add1_nonce()\fR return 1 for success and 0 for failure. .PP \&\fBOCSP_copy_nonce()\fR returns 1 if a nonce was successfully copied, 2 if no nonce was present in \fBreq\fR and 0 if an error occurred. .PP \&\fBOCSP_check_nonce()\fR returns the result of the nonce comparison between \fBreq\fR and \fBresp\fR. 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. .SH "NOTES" .IX Header "NOTES" For most purposes the nonce value in a request is set to a random value so the \fBval\fR parameter in \fBOCSP_request_add1_nonce()\fR is usually \s-1NULL.\s0 .PP An \s-1OCSP\s0 nonce is typically added to an \s-1OCSP\s0 request to thwart replay attacks by checking the same nonce value appears in the response. .PP Some responders may include a nonce in all responses even if one is not supplied. .PP Some responders cache \s-1OCSP\s0 responses and do not sign each response for performance reasons. As a result they do not support nonces. .PP The return values of \fBOCSP_check_nonce()\fR 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. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBcrypto\fR\|(7), \&\fBOCSP_cert_to_id\fR\|(3), \&\fBOCSP_REQUEST_new\fR\|(3), \&\fBOCSP_resp_find_status\fR\|(3), \&\fBOCSP_response_status\fR\|(3), \&\fBOCSP_sendreq_new\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2015\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.