mirror of https://github.com/openssl/openssl
93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_CRMF_pbm_new,
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OSSL_CRMF_pbmp_new
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- functions for producing Password-Based MAC (PBM)
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=head1 SYNOPSIS
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#include <openssl/crmf.h>
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int OSSL_CRMF_pbm_new(OSSL_LIB_CTX *libctx, const char *propq,
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const OSSL_CRMF_PBMPARAMETER *pbmp,
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const unsigned char *msg, size_t msglen,
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const unsigned char *sec, size_t seclen,
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unsigned char **mac, size_t *maclen);
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OSSL_CRMF_PBMPARAMETER *OSSL_CRMF_pbmp_new(OSSL_LIB_CTX *libctx, size_t saltlen,
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int owfnid, size_t itercnt,
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int macnid);
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=head1 DESCRIPTION
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OSSL_CRMF_pbm_new() generates a PBM (Password-Based MAC) based on given PBM
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parameters I<pbmp>, message I<msg>, and secret I<sec>, along with the respective
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lengths I<msglen> and I<seclen>.
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The optional library context I<libctx> and I<propq> parameters may be used
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to influence the selection of the MAC algorithm referenced in the I<pbmp>;
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see L<provider(7)/Fetching algorithms> for further information.
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On success writes the address of the newly
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allocated MAC via the I<mac> reference parameter and writes the length via the
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I<maclen> reference parameter unless it its NULL.
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OSSL_CRMF_pbmp_new() initializes and returns a new B<PBMParameter> structure
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with a new random salt of given length I<saltlen>,
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OWF (one-way function) NID I<owfnid>, OWF iteration count I<itercnt>,
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and MAC NID I<macnid>.
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The library context I<libctx> parameter may be used to select the provider
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for the random number generation (DRBG) and may be NULL for the default.
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=head1 NOTES
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The algorithms for the OWF (one-way function) and for the MAC (message
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authentication code) may be any with a NID defined in C<openssl/objects.h>.
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As specified by RFC 4210, these should include NID_hmac_sha1.
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RFC 4210 recommends that the salt SHOULD be at least 8 bytes (64 bits) long,
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where 16 bytes is common.
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The iteration count must be at least 100, as stipulated by RFC 4211, and is
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limited to at most 100000 to avoid DoS through manipulated or otherwise
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malformed input.
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=head1 RETURN VALUES
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OSSL_CRMF_pbm_new() returns 1 on success, 0 on error.
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OSSL_CRMF_pbmp_new() returns a new and initialized OSSL_CRMF_PBMPARAMETER
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structure, or NULL on error.
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=head1 EXAMPLES
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OSSL_CRMF_PBMPARAMETER *pbm = NULL;
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unsigned char *msg = "Hello";
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unsigned char *sec = "SeCrEt";
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unsigned char *mac = NULL;
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size_t maclen;
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if ((pbm = OSSL_CRMF_pbmp_new(16, NID_sha256, 500, NID_hmac_sha1) == NULL))
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goto err;
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if (!OSSL_CRMF_pbm_new(pbm, msg, 5, sec, 6, &mac, &maclen))
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goto err;
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=head1 SEE ALSO
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RFC 4211 section 4.4
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=head1 HISTORY
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The OpenSSL CRMF support was added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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