216 lines
7.3 KiB
Groff
216 lines
7.3 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "OCSP_REQUEST_ADD1_NONCE 3"
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.TH OCSP_REQUEST_ADD1_NONCE 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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OCSP_request_add1_nonce, OCSP_basic_add1_nonce, OCSP_check_nonce, OCSP_copy_nonce \- OCSP nonce functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ocsp.h>
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\&
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\& int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len);
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\& int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len);
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\& int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req);
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\& int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *resp);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBOCSP_request_add1_nonce()\fR adds a nonce of value \fBval\fR and length \fBlen\fR to
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\&\s-1OCSP\s0 request \fBreq\fR. If \fBval\fR is \fB\s-1NULL\s0\fR a random nonce is used. If \fBlen\fR
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is zero or negative a default length will be used (currently 16 bytes).
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.PP
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\&\fBOCSP_basic_add1_nonce()\fR is identical to \fBOCSP_request_add1_nonce()\fR except
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it adds a nonce to \s-1OCSP\s0 basic response \fBresp\fR.
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.PP
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\&\fBOCSP_check_nonce()\fR compares the nonce value in \fBreq\fR and \fBresp\fR.
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.PP
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\&\fBOCSP_copy_nonce()\fR copies any nonce value present in \fBreq\fR to \fBresp\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBOCSP_request_add1_nonce()\fR and \fBOCSP_basic_add1_nonce()\fR return 1 for success
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and 0 for failure.
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.PP
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\&\fBOCSP_copy_nonce()\fR returns 1 if a nonce was successfully copied, 2 if no nonce
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was present in \fBreq\fR and 0 if an error occurred.
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.PP
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\&\fBOCSP_check_nonce()\fR returns the result of the nonce comparison between \fBreq\fR
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and \fBresp\fR. The return value indicates the result of the comparison. If
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nonces are present and equal 1 is returned. If the nonces are absent 2 is
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returned. If a nonce is present in the response only 3 is returned. If nonces
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are present and unequal 0 is returned. If the nonce is present in the request
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only then \-1 is returned.
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.SH "NOTES"
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.IX Header "NOTES"
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For most purposes the nonce value in a request is set to a random value so
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the \fBval\fR parameter in \fBOCSP_request_add1_nonce()\fR is usually \s-1NULL.\s0
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.PP
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An \s-1OCSP\s0 nonce is typically added to an \s-1OCSP\s0 request to thwart replay attacks
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by checking the same nonce value appears in the response.
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.PP
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Some responders may include a nonce in all responses even if one is not
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supplied.
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.PP
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Some responders cache \s-1OCSP\s0 responses and do not sign each response for
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performance reasons. As a result they do not support nonces.
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.PP
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The return values of \fBOCSP_check_nonce()\fR can be checked to cover each case. A
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positive return value effectively indicates success: nonces are both present
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and match, both absent or present in the response only. A non-zero return
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additionally covers the case where the nonce is present in the request only:
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this will happen if the responder doesn't support nonces. A zero return value
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indicates present and mismatched nonces: this should be treated as an error
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condition.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBcrypto\fR\|(7),
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\&\fBOCSP_cert_to_id\fR\|(3),
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\&\fBOCSP_REQUEST_new\fR\|(3),
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\&\fBOCSP_resp_find_status\fR\|(3),
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\&\fBOCSP_response_status\fR\|(3),
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\&\fBOCSP_sendreq_new\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2015\-2020 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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