113 lines
5.3 KiB
HTML
Executable File
113 lines
5.3 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>EVP_PKEY_CTX_set_tls1_prf_md</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:" />
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</head>
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<body>
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<ul id="index">
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<li><a href="#NAME">NAME</a></li>
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<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#STRING-CTRLS">STRING CTRLS</a></li>
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<li><a href="#NOTES">NOTES</a></li>
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<li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
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<li><a href="#EXAMPLES">EXAMPLES</a></li>
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<li><a href="#SEE-ALSO">SEE ALSO</a></li>
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<li><a href="#HISTORY">HISTORY</a></li>
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<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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</ul>
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<h1 id="NAME">NAME</h1>
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<p>EVP_PKEY_CTX_set_tls1_prf_md, EVP_PKEY_CTX_set1_tls1_prf_secret, EVP_PKEY_CTX_add1_tls1_prf_seed - TLS PRF key derivation algorithm</p>
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<h1 id="SYNOPSIS">SYNOPSIS</h1>
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<pre><code> #include <openssl/kdf.h>
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int EVP_PKEY_CTX_set_tls1_prf_md(EVP_PKEY_CTX *pctx, const EVP_MD *md);
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int EVP_PKEY_CTX_set1_tls1_prf_secret(EVP_PKEY_CTX *pctx,
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unsigned char *sec, int seclen);
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int EVP_PKEY_CTX_add1_tls1_prf_seed(EVP_PKEY_CTX *pctx,
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unsigned char *seed, int seedlen);</code></pre>
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<h1 id="DESCRIPTION">DESCRIPTION</h1>
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<p>The <b>EVP_PKEY_TLS1_PRF</b> algorithm implements the PRF key derivation function for TLS. It has no associated private key and only implements key derivation using <a href="../man3/EVP_PKEY_derive.html">EVP_PKEY_derive(3)</a>.</p>
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<p>EVP_PKEY_set_tls1_prf_md() sets the message digest associated with the TLS PRF. EVP_md5_sha1() is treated as a special case which uses the PRF algorithm using both <b>MD5</b> and <b>SHA1</b> as used in TLS 1.0 and 1.1.</p>
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<p>EVP_PKEY_CTX_set_tls1_prf_secret() sets the secret value of the TLS PRF to <b>seclen</b> bytes of the buffer <b>sec</b>. Any existing secret value is replaced and any seed is reset.</p>
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<p>EVP_PKEY_CTX_add1_tls1_prf_seed() sets the seed to <b>seedlen</b> bytes of <b>seed</b>. If a seed is already set it is appended to the existing value.</p>
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<h1 id="STRING-CTRLS">STRING CTRLS</h1>
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<p>The TLS PRF also supports string based control operations using <a href="../man3/EVP_PKEY_CTX_ctrl_str.html">EVP_PKEY_CTX_ctrl_str(3)</a>. The <b>type</b> parameter "md" uses the supplied <b>value</b> as the name of the digest algorithm to use. The <b>type</b> parameters "secret" and "seed" use the supplied <b>value</b> parameter as a secret or seed value. The names "hexsecret" and "hexseed" are similar except they take a hex string which is converted to binary.</p>
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<h1 id="NOTES">NOTES</h1>
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<p>A context for the TLS PRF can be obtained by calling:</p>
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<pre><code> EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);</code></pre>
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<p>The digest, secret value and seed must be set before a key is derived or an error occurs.</p>
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<p>The total length of all seeds cannot exceed 1024 bytes in length: this should be more than enough for any normal use of the TLS PRF.</p>
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<p>The output length of the PRF is specified by the length parameter in the EVP_PKEY_derive() function. Since the output length is variable, setting the buffer to <b>NULL</b> is not meaningful for the TLS PRF.</p>
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<p>Optimised versions of the TLS PRF can be implemented in an ENGINE.</p>
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<h1 id="RETURN-VALUES">RETURN VALUES</h1>
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<p>All these functions return 1 for success and 0 or a negative value for failure. In particular a return value of -2 indicates the operation is not supported by the public key algorithm.</p>
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<h1 id="EXAMPLES">EXAMPLES</h1>
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<p>This example derives 10 bytes using SHA-256 with the secret key "secret" and seed value "seed":</p>
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<pre><code> EVP_PKEY_CTX *pctx;
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unsigned char out[10];
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size_t outlen = sizeof(out);
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pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
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if (EVP_PKEY_derive_init(pctx) <= 0)
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/* Error */
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if (EVP_PKEY_CTX_set_tls1_prf_md(pctx, EVP_sha256()) <= 0)
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/* Error */
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if (EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, "secret", 6) <= 0)
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/* Error */
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if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, "seed", 4) <= 0)
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/* Error */
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if (EVP_PKEY_derive(pctx, out, &outlen) <= 0)
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/* Error */</code></pre>
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<h1 id="SEE-ALSO">SEE ALSO</h1>
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<p><a href="../man3/EVP_PKEY_CTX_new.html">EVP_PKEY_CTX_new(3)</a>, <a href="../man3/EVP_PKEY_CTX_ctrl_str.html">EVP_PKEY_CTX_ctrl_str(3)</a>, <a href="../man3/EVP_PKEY_derive.html">EVP_PKEY_derive(3)</a></p>
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<h1 id="HISTORY">HISTORY</h1>
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<p>All of the functions described here were converted from macros to functions in OpenSSL 3.0.</p>
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<h1 id="COPYRIGHT">COPYRIGHT</h1>
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<p>Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). 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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</body>
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</html>
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