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Rename

<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>EVP_KDF-SS</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rev="made" href="mailto:root@localhost" />
</head>

<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a>
    <ul>
      <li><a href="#Auxiliary-function">Auxiliary function</a></li>
      <li><a href="#Identity">Identity</a></li>
      <li><a href="#Supported-parameters">Supported parameters</a></li>
    </ul>
  </li>
  <li><a href="#NOTES">NOTES</a></li>
  <li><a href="#EXAMPLES">EXAMPLES</a></li>
  <li><a href="#CONFORMING-TO">CONFORMING TO</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>

<p>EVP_KDF-SS - The Single Step / One Step EVP_KDF implementation</p>

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

<p>The EVP_KDF-SS algorithm implements the Single Step key derivation function (SSKDF). SSKDF derives a key using input such as a shared secret key (that was generated during the execution of a key establishment scheme) and fixedinfo. SSKDF is also informally referred to as &#39;Concat KDF&#39;.</p>

<h2 id="Auxiliary-function">Auxiliary function</h2>

<p>The implementation uses a selectable auxiliary function H, which can be one of:</p>

<dl>

<dt id="H-x-hash-x-digest-md"><b>H(x) = hash(x, digest=md)</b></dt>
<dd>

</dd>
<dt id="H-x-HMAC_hash-x-key-salt-digest-md"><b>H(x) = HMAC_hash(x, key=salt, digest=md)</b></dt>
<dd>

</dd>
<dt id="H-x-KMACxxx-x-key-salt-custom-KDF-outlen-mac_size"><b>H(x) = KMACxxx(x, key=salt, custom=&quot;KDF&quot;, outlen=mac_size)</b></dt>
<dd>

</dd>
</dl>

<p>Both the HMAC and KMAC implementations set the key using the &#39;salt&#39; value. The hash and HMAC also require the digest to be set.</p>

<h2 id="Identity">Identity</h2>

<p>&quot;SSKDF&quot; is the name for this implementation; it can be used with the EVP_KDF_fetch() function.</p>

<h2 id="Supported-parameters">Supported parameters</h2>

<p>The supported parameters are:</p>

<dl>

<dt id="properties-OSSL_KDF_PARAM_PROPERTIES-UTF8-string">&quot;properties&quot; (<b>OSSL_KDF_PARAM_PROPERTIES</b>) &lt;UTF8 string&gt;</dt>
<dd>

</dd>
<dt id="digest-OSSL_KDF_PARAM_DIGEST-UTF8-string">&quot;digest&quot; (<b>OSSL_KDF_PARAM_DIGEST</b>) &lt;UTF8 string&gt;</dt>
<dd>

</dd>
<dt id="mac-OSSL_KDF_PARAM_MAC-UTF8-string">&quot;mac&quot; (<b>OSSL_KDF_PARAM_MAC</b>) &lt;UTF8 string&gt;</dt>
<dd>

</dd>
<dt id="maclen-OSSL_KDF_PARAM_MAC_SIZE-unsigned-integer">&quot;maclen&quot; (<b>OSSL_KDF_PARAM_MAC_SIZE</b>) &lt;unsigned integer&gt;</dt>
<dd>

</dd>
<dt id="salt-OSSL_KDF_PARAM_SALT-octet-string">&quot;salt&quot; (<b>OSSL_KDF_PARAM_SALT</b>) &lt;octet string&gt;</dt>
<dd>

<p>These parameters work as described in <a href="../man3/EVP_KDF.html">&quot;PARAMETERS&quot; in EVP_KDF(3)</a>.</p>

</dd>
<dt id="key-EVP_KDF_CTRL_SET_KEY-octet-string">&quot;key&quot; (<b>EVP_KDF_CTRL_SET_KEY</b>) &lt;octet string&gt;</dt>
<dd>

<p>This parameter set the shared secret that is used for key derivation.</p>

</dd>
<dt id="info-OSSL_KDF_PARAM_INFO-octet-string">&quot;info&quot; (<b>OSSL_KDF_PARAM_INFO</b>) &lt;octet string&gt;</dt>
<dd>

<p>This parameter sets an optional value for fixedinfo, also known as otherinfo.</p>

</dd>
</dl>

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

<p>A context for SSKDF can be obtained by calling:</p>

<pre><code> EVP_KDF *kdf = EVP_KDF_fetch(NULL, &quot;SSKDF&quot;, NULL);
 EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf);</code></pre>

<p>The output length of an SSKDF is specified via the <i>keylen</i> parameter to the <a href="../man3/EVP_KDF_derive.html">EVP_KDF_derive(3)</a> function.</p>

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

<p>This example derives 10 bytes using H(x) = SHA-256, with the secret key &quot;secret&quot; and fixedinfo value &quot;label&quot;:</p>

<pre><code> EVP_KDF *kdf;
 EVP_KDF_CTX *kctx;
 unsigned char out[10];
 OSSL_PARAM params[4], *p = params;

kdf = EVP_KDF_fetch(NULL, &quot;SSKDF&quot;, NULL);
 kctx = EVP_KDF_CTX_new(kdf);
 EVP_KDF_free(kdf);

*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
                                         SN_sha256, strlen(SN_sha256));
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
                                          &quot;secret&quot;, (size_t)6);
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
                                          &quot;label&quot;, (size_t)5);
 *p = OSSL_PARAM_construct_end();
 if (EVP_KDF_derive(kctx, out, sizeof(out), params) &lt;= 0) {
     error(&quot;EVP_KDF_derive&quot;);
 }

EVP_KDF_CTX_free(kctx);</code></pre>

<p>This example derives 10 bytes using H(x) = HMAC(SHA-256), with the secret key &quot;secret&quot;, fixedinfo value &quot;label&quot; and salt &quot;salt&quot;:</p>

<pre><code> EVP_KDF *kdf;
 EVP_KDF_CTX *kctx;
 unsigned char out[10];
 OSSL_PARAM params[6], *p = params;

kdf = EVP_KDF_fetch(NULL, &quot;SSKDF&quot;, NULL);
 kctx = EVP_KDF_CTX_new(kdf);
 EVP_KDF_free(kdf);

*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_MAC,
                                         SN_hmac, strlen(SN_hmac));
 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
                                         SN_sha256, strlen(SN_sha256));
 *p++ = OSSL_PARAM_construct_octet_string(EVP_KDF_CTRL_SET_KEY,
                                          &quot;secret&quot;, (size_t)6);
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
                                          &quot;label&quot;, (size_t)5);
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
                                          &quot;salt&quot;, (size_t)4);
 *p = OSSL_PARAM_construct_end();
 if (EVP_KDF_derive(kctx, out, sizeof(out), params) &lt;= 0) {
     error(&quot;EVP_KDF_derive&quot;);
 }

EVP_KDF_CTX_free(kctx);</code></pre>

<p>This example derives 10 bytes using H(x) = KMAC128(x,salt,outlen), with the secret key &quot;secret&quot; fixedinfo value &quot;label&quot;, salt of &quot;salt&quot; and KMAC outlen of 20:</p>

<pre><code> EVP_KDF *kdf;
 EVP_KDF_CTX *kctx;
 unsigned char out[10];
 OSSL_PARAM params[7], *p = params;

kdf = EVP_KDF_fetch(NULL, &quot;SSKDF&quot;, NULL);
 kctx = EVP_KDF_CTX_new(kdf);
 EVP_KDF_free(kdf);

*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_MAC,
                                         SN_kmac128, strlen(SN_kmac128));
 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
                                         SN_sha256, strlen(SN_sha256));
 *p++ = OSSL_PARAM_construct_octet_string(EVP_KDF_CTRL_SET_KEY,
                                          &quot;secret&quot;, (size_t)6);
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
                                          &quot;label&quot;, (size_t)5);
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
                                          &quot;salt&quot;, (size_t)4);
 *p++ = OSSL_PARAM_construct_size_t(OSSL_KDF_PARAM_MAC_SIZE, (size_t)20);
 *p = OSSL_PARAM_construct_end();
 if (EVP_KDF_derive(kctx, out, sizeof(out), params) &lt;= 0) {
     error(&quot;EVP_KDF_derive&quot;);
 }

EVP_KDF_CTX_free(kctx);</code></pre>

<h1 id="CONFORMING-TO">CONFORMING TO</h1>

<p><a href="../man3/EVP_KDF.html">EVP_KDF(3)</a>, <a href="../man3/EVP_KDF_CTX_new.html">EVP_KDF_CTX_new(3)</a>, <a href="../man3/EVP_KDF_CTX_free.html">EVP_KDF_CTX_free(3)</a>, <a href="../man3/EVP_KDF_CTX_set_params.html">EVP_KDF_CTX_set_params(3)</a>, <a href="../man3/EVP_KDF_CTX_get_kdf_size.html">EVP_KDF_CTX_get_kdf_size(3)</a>, <a href="../man3/EVP_KDF_derive.html">EVP_KDF_derive(3)</a>, <a href="../man3/EVP_KDF.html">&quot;PARAMETERS&quot; in EVP_KDF(3)</a></p>

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

<p>This functionality was added to OpenSSL 3.0.</p>

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

<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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