Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42)

Standard preamble:
========================================================================
..

..

.. Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. \*(C+ will
give a nicer C++. Capital omega is used to do unbreakable dashes and
therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.

If the F register is >0, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
entries marked with X<> in POD. Of course, you'll have to process the
output yourself in some meaningful fashion.

Avoid warning from groff about undefined register 'F'.
.. .nr rF 0 . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================

Title "OCSP_REQUEST_ADD1_NONCE 3ossl" 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 Apache License 2.0 (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>.