DragonFly On-Line Manual Pages

Search: Section:  


OCSP_REQUEST_ADD1_NONCE(3)          OpenSSL         OCSP_REQUEST_ADD1_NONCE(3)

NAME

OCSP_request_add1_nonce, OCSP_basic_add1_nonce, OCSP_check_nonce, OCSP_copy_nonce - OCSP nonce functions

SYNOPSIS

#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);

DESCRIPTION

OCSP_request_add1_nonce() adds a nonce of value val and length len to OCSP request req. If val is NULL a random nonce is used. If len is zero or negative a default length will be used (currently 16 bytes). OCSP_basic_add1_nonce() is identical to OCSP_request_add1_nonce() except it adds a nonce to OCSP basic response resp. OCSP_check_nonce() compares the nonce value in req and resp. OCSP_copy_nonce() copies any nonce value present in req to resp.

RETURN VALUES

OCSP_request_add1_nonce() and OCSP_basic_add1_nonce() return 1 for success and 0 for failure. OCSP_copy_nonce() returns 1 if a nonce was successfully copied, 2 if no nonce was present in req and 0 if an error occurred. OCSP_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.

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 NULL. An OCSP nonce is typically added to an OCSP 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 OCSP 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.

SEE ALSO

crypto(7), OCSP_cert_to_id(3), OCSP_REQUEST_new(3), OCSP_resp_find_status(3), OCSP_response_status(3), OCSP_sendreq_new(3)

COPYRIGHT

Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved. 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 <https://www.openssl.org/source/license.html>. 1.1.1l 2021-08-24 OCSP_REQUEST_ADD1_NONCE(3)

Search: Section: