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.\" ========================================================================
.\"
.IX Title "OSSL_CRMF_PBMP_NEW 3ossl"
.TH OSSL_CRMF_PBMP_NEW 3ossl "2026-01-16" "3.5.1" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
OSSL_CRMF_pbm_new,
OSSL_CRMF_pbmp_new
\&\- functions for producing Password\-Based MAC (PBM)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/crmf.h>
\&
\& int OSSL_CRMF_pbm_new(OSSL_LIB_CTX *libctx, const char *propq,
\&                       const OSSL_CRMF_PBMPARAMETER *pbmp,
\&                       const unsigned char *msg, size_t msglen,
\&                       const unsigned char *sec, size_t seclen,
\&                       unsigned char **mac, size_t *maclen);
\&
\& OSSL_CRMF_PBMPARAMETER *OSSL_CRMF_pbmp_new(OSSL_LIB_CTX *libctx, size_t saltlen,
\&                                            int owfnid, size_t itercnt,
\&                                            int macnid);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBOSSL_CRMF_pbm_new()\fR generates a \s-1PBM\s0 (Password-Based \s-1MAC\s0) based on given \s-1PBM\s0
parameters \fIpbmp\fR, message \fImsg\fR, and secret \fIsec\fR, along with the respective
lengths \fImsglen\fR and \fIseclen\fR.
The optional library context \fIlibctx\fR and \fIpropq\fR parameters may be used
to influence the selection of the \s-1MAC\s0 algorithm referenced in the \fIpbmp\fR;
see \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for further information.
On success writes the address of the newly
allocated \s-1MAC\s0 via the \fImac\fR reference parameter and writes the length via the
\&\fImaclen\fR reference parameter unless it its \s-1NULL.\s0
.PP
\&\fBOSSL_CRMF_pbmp_new()\fR initializes and returns a new \fBPBMParameter\fR structure
with a new random salt of given length \fIsaltlen\fR,
\&\s-1OWF\s0 (one-way function) \s-1NID\s0 \fIowfnid\fR, \s-1OWF\s0 iteration count \fIitercnt\fR,
and \s-1MAC NID\s0 \fImacnid\fR.
The library context \fIlibctx\fR parameter may be used to select the provider
for the random number generation (\s-1DRBG\s0) and may be \s-1NULL\s0 for the default.
.SH "NOTES"
.IX Header "NOTES"
The algorithms for the \s-1OWF\s0 (one-way function) and for the \s-1MAC\s0 (message
authentication code) may be any with a \s-1NID\s0 defined in \fI<openssl/objects.h>\fR.
As specified by \s-1RFC 4210,\s0 these should include NID_hmac_sha1.
.PP
\&\s-1RFC 4210\s0 recommends that the salt \s-1SHOULD\s0 be at least 8 bytes (64 bits) long,
where 16 bytes is common.
.PP
The iteration count must be at least 100, as stipulated by \s-1RFC 4211,\s0 and is
limited to at most 100000 to avoid DoS through manipulated or otherwise
malformed input.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBOSSL_CRMF_pbm_new()\fR returns 1 on success, 0 on error.
.PP
\&\fBOSSL_CRMF_pbmp_new()\fR returns a new and initialized \s-1OSSL_CRMF_PBMPARAMETER\s0
structure, or \s-1NULL\s0 on error.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.Vb 5
\& OSSL_CRMF_PBMPARAMETER *pbm = NULL;
\& unsigned char *msg = "Hello";
\& unsigned char *sec = "SeCrEt";
\& unsigned char *mac = NULL;
\& size_t maclen;
\&
\& if ((pbm = OSSL_CRMF_pbmp_new(16, NID_sha256, 500, NID_hmac_sha1) == NULL))
\&     goto err;
\& if (!OSSL_CRMF_pbm_new(pbm, msg, 5, sec, 6, &mac, &maclen))
\&     goto err;
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1RFC 4211\s0 section 4.4
.SH "HISTORY"
.IX Header "HISTORY"
The OpenSSL \s-1CRMF\s0 support was added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2007\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.
