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Name	Size	Permission	Date
img	[ DIR ]	drwxr-xr-x	2025-02-06 06:22
EVP_ASYM_CIPHER-SM2.html	2.21 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-AES.html	4.63 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-ARIA.html	3.22 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-BLOWFISH.html	2.04 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-CAMELLIA.html	3.17 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-CAST.html	2.4 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-CHACHA.html	1.96 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-DES.html	3.15 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-IDEA.html	2.12 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-RC2.html	2.26 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-RC4.html	1.98 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-RC5.html	2.14 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-SEED.html	2.15 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-SM4.html	2.17 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-HKDF.html	7.44 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-KB.html	8.21 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-KRB5KDF.html	5.37 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-PBKDF1.html	3.85 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-PBKDF2.html	4.66 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-PKCS12KDF.html	4.11 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-SCRYPT.html	7.08 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-SS.html	8.43 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-SSHKDF.html	7.24 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-TLS13_KDF.html	6.5 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-TLS1_PRF.html	4.9 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-X942-ASN1.html	7.41 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-X942-CONCAT.html	1.78 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-X963.html	4.86 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEM-RSA.html	2.85 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEYEXCH-DH.html	6.42 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEYEXCH-ECDH.html	6.21 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEYEXCH-X25519.html	2.5 KB	-rw-r--r--	2025-02-06 06:22
EVP_MAC-BLAKE2.html	4.25 KB	-rw-r--r--	2025-02-06 06:22
EVP_MAC-CMAC.html	3.77 KB	-rw-r--r--	2025-02-06 06:22
EVP_MAC-GMAC.html	3.69 KB	-rw-r--r--	2025-02-06 06:22
EVP_MAC-HMAC.html	4.54 KB	-rw-r--r--	2025-02-06 06:22
EVP_MAC-KMAC.html	6.46 KB	-rw-r--r--	2025-02-06 06:22
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EVP_MD-MD4.html	1.83 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-MD5-SHA1.html	3 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-MD5.html	1.83 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-MDC2.html	2.64 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-RIPEMD160.html	2.1 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHA1.html	3.03 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHA2.html	2.85 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHA3.html	2.16 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHAKE.html	3.98 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SM3.html	1.84 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-WHIRLPOOL.html	1.86 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-common.html	2.88 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-DH.html	15.63 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-DSA.html	6.09 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-EC.html	14.04 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-FFC.html	11.47 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-HMAC.html	4.69 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-RSA.html	15.32 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-SM2.html	4.65 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-X25519.html	5.03 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND-CTR-DRBG.html	5.56 KB	-rw-r--r--	2025-02-06 06:22
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EVP_RAND-HMAC-DRBG.html	5.39 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND-SEED-SRC.html	3.69 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND-TEST-RAND.html	6 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND.html	15.67 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-DSA.html	2.92 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-ECDSA.html	2.93 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-ED25519.html	5.02 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-HMAC.html	2.96 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-RSA.html	5.58 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-FIPS.html	19.9 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-base.html	4.06 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-default.html	13.14 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-legacy.html	5.08 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-null.html	1.75 KB	-rw-r--r--	2025-02-06 06:22
RAND.html	4.49 KB	-rw-r--r--	2025-02-06 06:22
RSA-PSS.html	3.29 KB	-rw-r--r--	2025-02-06 06:22
X25519.html	3.57 KB	-rw-r--r--	2025-02-06 06:22
bio.html	4.47 KB	-rw-r--r--	2025-02-06 06:22
crypto.html	27.34 KB	-rw-r--r--	2025-02-06 06:22
ct.html	2.71 KB	-rw-r--r--	2025-02-06 06:22
des_modes.html	7.94 KB	-rw-r--r--	2025-02-06 06:22
evp.html	7.56 KB	-rw-r--r--	2025-02-06 06:22
fips_module.html	22.56 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-cipher.html	15.05 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-digest.html	7.91 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-kdf.html	5.43 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-mac.html	7.63 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-pkey.html	31.16 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-rand.html	6.68 KB	-rw-r--r--	2025-02-06 06:22
migration_guide.html	123.13 KB	-rw-r--r--	2025-02-06 06:22
openssl-core.h.html	5.78 KB	-rw-r--r--	2025-02-06 06:22
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openssl-glossary.html	9.71 KB	-rw-r--r--	2025-02-06 06:22
openssl-threads.html	5.79 KB	-rw-r--r--	2025-02-06 06:22
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property.html	7.97 KB	-rw-r--r--	2025-02-06 06:22
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provider-cipher.html	14.16 KB	-rw-r--r--	2025-02-06 06:22
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provider-kdf.html	16.91 KB	-rw-r--r--	2025-02-06 06:22
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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-KRB5KDF</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="#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-KRB5KDF - The RFC3961 Krb5 KDF EVP_KDF implementation</p>

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

<p>Support for computing the <b>KRB5KDF</b> KDF through the <b>EVP_KDF</b> API.</p>

<p>The EVP_KDF-KRB5KDF algorithm implements the key derivation function defined in RFC 3961, section 5.1 and is used by Krb5 to derive session keys. Three inputs are required to perform key derivation: a cipher, (for example AES-128-CBC), the initial key, and a constant.</p>

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

<p>&quot;KRB5KDF&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="cipher-OSSL_KDF_PARAM_CIPHER-UTF8-string">&quot;cipher&quot; (<b>OSSL_KDF_PARAM_CIPHER</b>) &lt;UTF8 string&gt;</dt>
<dd>

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

<p>This parameter sets the constant value for the KDF. If a value is already set, the contents are replaced.</p>

</dd>
</dl>

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

<p>A context for KRB5KDF can be obtained by calling:</p>

<pre><code> EVP_KDF *kdf = EVP_KDF_fetch(NULL, &quot;KRB5KDF&quot;, NULL);
 EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf);</code></pre>

<p>The output length of the KRB5KDF derivation is specified via the <i>keylen</i> parameter to the <a href="../man3/EVP_KDF_derive.html">EVP_KDF_derive(3)</a> function, and MUST match the key length for the chosen cipher or an error is returned. Moreover, the constant&#39;s length must not exceed the block size of the cipher. Since the KRB5KDF output length depends on the chosen cipher, calling <a href="../man3/EVP_KDF_CTX_get_kdf_size.html">EVP_KDF_CTX_get_kdf_size(3)</a> to obtain the requisite length returns the correct length only after the cipher is set. Prior to that <b>EVP_MAX_KEY_LENGTH</b> is returned. The caller must allocate a buffer of the correct length for the chosen cipher, and pass that buffer to the <a href="../man3/EVP_KDF_derive.html">EVP_KDF_derive(3)</a> function along with that length.</p>

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

<p>This example derives a key using the AES-128-CBC cipher:</p>

<pre><code> EVP_KDF *kdf;
 EVP_KDF_CTX *kctx;
 unsigned char key[16] = &quot;01234...&quot;;
 unsigned char constant[] = &quot;I&#39;m a constant&quot;;
 unsigned char out[16];
 size_t outlen = sizeof(out);
 OSSL_PARAM params[4], *p = params;

kdf = EVP_KDF_fetch(NULL, &quot;KRB5KDF&quot;, NULL);
 kctx = EVP_KDF_CTX_new(kdf);
 EVP_KDF_free(kdf);

*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CIPHER,
                                         SN_aes_128_cbc,
                                         strlen(SN_aes_128_cbc));
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
                                          key, (size_t)16);
 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_CONSTANT,
                                          constant, strlen(constant));
 *p = OSSL_PARAM_construct_end();
 if (EVP_KDF_derive(kctx, out, outlen, params) &lt;= 0)
     /* Error */

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_free.html">EVP_KDF_CTX_free(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>

</body>

</html>