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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#NOTES">NOTES</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#EXAMPLES">EXAMPLES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>OSSL_CRMF_pbm_new, OSSL_CRMF_pbmp_new - functions for producing Password-Based MAC (PBM)</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>#include &lt;openssl/crmf.h&gt;

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);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>OSSL_CRMF_pbm_new() generates a PBM (Password-Based MAC) based on given PBM parameters <i>pbmp</i>, message <i>msg</i>, and secret <i>sec</i>, along with the respective lengths <i>msglen</i> and <i>seclen</i>. The optional library context <i>libctx</i> and <i>propq</i> parameters may be used to influence the selection of the MAC algorithm referenced in the <i>pbmp</i>; see <a href="../man7/crypto.html">&quot;ALGORITHM FETCHING&quot; in crypto(7)</a> for further information. On success writes the address of the newly allocated MAC via the <i>mac</i> reference parameter and writes the length via the <i>maclen</i> reference parameter unless it its NULL.</p>

<p>OSSL_CRMF_pbmp_new() initializes and returns a new <b>PBMParameter</b> structure with a new random salt of given length <i>saltlen</i>, OWF (one-way function) NID <i>owfnid</i>, OWF iteration count <i>itercnt</i>, and MAC NID <i>macnid</i>. The library context <i>libctx</i> parameter may be used to select the provider for the random number generation (DRBG) and may be NULL for the default.</p>

<h1 id="NOTES">NOTES</h1>

<p>The algorithms for the OWF (one-way function) and for the MAC (message authentication code) may be any with a NID defined in <i>&lt;openssl/objects.h&gt;</i>. As specified by RFC 4210, these should include NID_hmac_sha1.</p>

<p>RFC 4210 recommends that the salt SHOULD be at least 8 bytes (64 bits) long, where 16 bytes is common.</p>

<p>The iteration count must be at least 100, as stipulated by RFC 4211, and is limited to at most 100000 to avoid DoS through manipulated or otherwise malformed input.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>OSSL_CRMF_pbm_new() returns 1 on success, 0 on error.</p>

<p>OSSL_CRMF_pbmp_new() returns a new and initialized OSSL_CRMF_PBMPARAMETER structure, or NULL on error.</p>

<h1 id="EXAMPLES">EXAMPLES</h1>

<pre><code>OSSL_CRMF_PBMPARAMETER *pbm = NULL;
unsigned char *msg = &quot;Hello&quot;;
unsigned char *sec = &quot;SeCrEt&quot;;
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, &amp;mac, &amp;maclen))
    goto err;</code></pre>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p>RFC 4211 section 4.4</p>

<h1 id="HISTORY">HISTORY</h1>

<p>The OpenSSL CRMF support was added in OpenSSL 3.0.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the Apache License 2.0 (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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