doc/man3/OSSL_CRMF_pbmp_new.pod

   1 =pod
   2
   3 =head1 NAME
   4
   5 OSSL_CRMF_pbm_new,
   6 OSSL_CRMF_pbmp_new
   7 - functions for producing Password-Based MAC (PBM)
   8
   9 =head1 SYNOPSIS
  10
  11   #include <openssl/crmf.h>
  12
  13   int OSSL_CRMF_pbm_new(const OSSL_CRMF_PBMPARAMETER *pbmp,
  14                         const unsigned char *msg, size_t msglen,
  15                         const unsigned char *sec, size_t seclen,
  16                         unsigned char **mac, unsigned int *maclen);
  17
  18   OSSL_CRMF_PBMPARAMETER *OSSL_CRMF_pbmp_new(size_t saltlen, int owfnid,
  19                                              int itercnt, int macnid);
  20
  21 =head1 DESCRIPTION
  22
  23 OSSL_CRMF_pbm_new() generates a PBM (Password-Based MAC) based on given PBM
  24 parameters B<pbmp>, message B<msg>, and secret B<sec>, along with the respective
  25 lengths B<msglen> and B<seclen>. Will write the adddress of the newly allocated
  26 MAC via the B<mac> reference parameter and the length via the B<maclen> reference
  27 parameter. Any previous pointer referred to by B<mac> will be freed if not NULL.
  28
  29 The iteration count must be at least 100, as stipulated by RFC 4211, and is
  30 limited to at most 100000 to avoid DoS through manipulated or otherwise
  31 malformed input.
  32
  33 OSSL_CRMF_pbmp_new() initializes and returns a new PBMParameter
  34 structure with new a random salt of given length B<saltlen>, OWF (one-way
  35 function) NID B<owfnid>, iteration count B<itercnt>, and MAC NID B<macnid>.
  36
  37 =head1 NOTES
  38
  39 The OWF (one-way function) and for the MAC (message authentication code) may be
  40 any with a NID defined in B<openssl/objects.h>,
  41 which also should include NID_hmac_sha1 which is specified by RFC 4210.
  42
  43 RFC 4210 recommends that the salt SHOULD be at least 8 bytes (64 bits) long.
  44
  45 =head1 RETURN VALUES
  46
  47 OSSL_CRMF_pbm_new() returns 1 on success, 0 on error.
  48
  49 OSSL_CRMF_pbmp_new() returns a new and initialized OSSL_CRMF_PBMPARAMETER
  50 structure, or NULL on error.
  51
  52 =head1 EXAMPLE
  53
  54  OSSL_CRMF_PBMPARAMETER *pbm = NULL;
  55  unsigned char *msg = "Hello";
  56  unsigend char *sec = "SeCrEt";
  57  unsigend char *mac = NULL;
  58  unsigend int maclen;
  59
  60  if ((pbm = OSSL_CRMF_pbmp_new(16, NID_sha256, 500, NID_hmac_sha1) == NULL))
  61      goto err;
  62  if (!OSSL_CRMF_pbm_new(pbm, msg, 5, sec, 6, &mac, &maclen))
  63      goto err;
  64
  65 =head1 SEE ALSO
  66
  67 RFC 4211 section 4.4
  68
  69 =head1 COPYRIGHT
  70
  71 Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
  72
  73 Licensed under the OpenSSL license (the "License").  You may not use
  74 this file except in compliance with the License.  You can obtain a copy
  75 in the file LICENSE in the source distribution or at
  76 L<https://www.openssl.org/source/license.html>.
  77
  78 =cut