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Title "OCSP_REQUEST_ADD1_NONCE 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
OCSP_request_add1_nonce, OCSP_basic_add1_nonce, OCSP_check_nonce, OCSP_copy_nonce - OCSP nonce functions 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 Header "DESCRIPTION" \fBOCSP_request_add1_nonce() adds a nonce of value val and length len to \s-1OCSP\s0 request req. If val is \s-1NULL\s0 a random nonce is used. If len is zero or negative a default length will be used (currently 16 bytes).

\fBOCSP_basic_add1_nonce() is identical to OCSP_request_add1_nonce() except it adds a nonce to \s-1OCSP\s0 basic response resp.

\fBOCSP_check_nonce() compares the nonce value in req and resp.

\fBOCSP_copy_nonce() copies any nonce value present in req to resp.

Header "RETURN VALUES" \fBOCSP_request_add1_nonce() and OCSP_basic_add1_nonce() return 1 for success and 0 for failure.

\fBOCSP_copy_nonce() returns 1 if a nonce was successfully copied, 2 if no nonce was present in req and 0 if an error occurred.

\fBOCSP_check_nonce() returns the result of the nonce comparison between req and resp. 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.

Header "NOTES" For most purposes the nonce value in a request is set to a random value so the val parameter in OCSP_request_add1_nonce() is usually \s-1NULL.\s0

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.

Some responders may include a nonce in all responses even if one is not supplied.

Some responders cache \s-1OCSP\s0 responses and do not sign each response for performance reasons. As a result they do not support nonces.

The return values of OCSP_check_nonce() 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.

Header "SEE ALSO" \fBcrypto\|(7), \fBOCSP_cert_to_id\|(3), \fBOCSP_REQUEST_new\|(3), \fBOCSP_resp_find_status\|(3), \fBOCSP_response_status\|(3), \fBOCSP_sendreq_new\|(3) Header "COPYRIGHT" Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.

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>.