142 lines
5.0 KiB
HTML
142 lines
5.0 KiB
HTML
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<?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_KDF-PBKDF2</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:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<ul>
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<li><a href="#identity">Identity</a></li>
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<li><a href="#supported_parameters">Supported parameters</a></li>
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</ul>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#conforming_to">CONFORMING TO</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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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>EVP_KDF-PBKDF2 - The PBKDF2 EVP_KDF implementation</p>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>Support for computing the <strong>PBKDF2</strong> password-based KDF through the <strong>EVP_KDF</strong>
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API.</p>
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<p>The EVP_KDF-PBKDF2 algorithm implements the PBKDF2 password-based key
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derivation function, as described in SP800-132; it derives a key from a password
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using a salt and iteration count.</p>
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<p>
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</p>
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<h2><a name="identity">Identity</a></h2>
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<p>"PBKDF2" is the name for this implementation; it
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can be used with the <code>EVP_KDF_fetch()</code> function.</p>
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<p>
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</p>
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<h2><a name="supported_parameters">Supported parameters</a></h2>
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<p>The supported parameters are:</p>
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<dl>
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<dt><strong><a name="pass_ossl_kdf_param_password_octet_string" class="item">"pass" (<strong>OSSL_KDF_PARAM_PASSWORD</strong>) <octet string></a></strong></dt>
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<dt><strong><a name="salt_ossl_kdf_param_salt_octet_string" class="item">"salt" (<strong>OSSL_KDF_PARAM_SALT</strong>) <octet string></a></strong></dt>
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<dt><strong><a name="iter_ossl_kdf_param_iter_unsigned_integer" class="item">"iter" (<strong>OSSL_KDF_PARAM_ITER</strong>) <unsigned integer></a></strong></dt>
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<dd>
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<p>This parameter has a default value of 2048.</p>
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</dd>
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<dt><strong><a name="properties_ossl_kdf_param_properties_utf8_string" class="item">"properties" (<strong>OSSL_KDF_PARAM_PROPERTIES</strong>) <UTF8 string></a></strong></dt>
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<dt><strong><a name="digest_ossl_kdf_param_digest_utf8_string" class="item">"digest" (<strong>OSSL_KDF_PARAM_DIGEST</strong>) <UTF8 string></a></strong></dt>
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<dd>
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<p>These parameters work as described in <em>EVP_KDF(3)/PARAMETERS</em>.</p>
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</dd>
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<dt><strong><a name="pkcs5_ossl_kdf_param_pkcs5_integer" class="item">"pkcs5" (<strong>OSSL_KDF_PARAM_PKCS5</strong>) <integer></a></strong></dt>
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<dd>
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<p>This parameter can be used to enable or disable SP800-132 compliance checks.
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Setting the mode to 0 enables the compliance checks.</p>
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<p>The checks performed are:</p>
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<dl>
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<dt><strong><a name="the_iteration_count_is_at_least_1000" class="item">- the iteration count is at least 1000.</a></strong></dt>
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<dt><strong><a name="the_salt_length_is_at_least_128_bits" class="item">- the salt length is at least 128 bits.</a></strong></dt>
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<dt><strong><a name="the_derived_key_length_is_at_least_112_bits" class="item">- the derived key length is at least 112 bits.</a></strong></dt>
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</dl>
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<p>The default provider uses a default mode of 1 for backwards compatibility,
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and the fips provider uses a default mode of 0.</p>
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<p>The value string is expected to be a decimal number 0 or 1.</p>
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</dd>
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</dl>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>A typical application of this algorithm is to derive keying material for an
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encryption algorithm from a password in the "pass", a salt in "salt",
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and an iteration count.</p>
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<p>Increasing the "iter" parameter slows down the algorithm which makes it
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harder for an attacker to perform a brute force attack using a large number
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of candidate passwords.</p>
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<p>No assumption is made regarding the given password; it is simply treated as a
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byte sequence.</p>
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<p>
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</p>
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<hr />
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<h1><a name="conforming_to">CONFORMING TO</a></h1>
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<p>SP800-132</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>EVP_KDF(3)</em>,
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<em>EVP_KDF_CTX_new(3)</em>,
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<em>EVP_KDF_CTX_free(3)</em>,
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<em>EVP_KDF_CTX_set_params(3)</em>,
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<em>EVP_KDF_derive(3)</em>,
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<em>EVP_KDF(3)/PARAMETERS</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="history">HISTORY</a></h1>
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<p>This functionality was added to OpenSSL 3.0.</p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2018-2019 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
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<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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