157 lines
5.1 KiB
HTML
157 lines
5.1 KiB
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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-X963</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="#examples">EXAMPLES</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-X963 - The X9.63-2001 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>The EVP_KDF-X963 algorithm implements the key derivation function (X963KDF).
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X963KDF is used by Cryptographic Message Syntax (CMS) for EC KeyAgreement, to
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derive a key using input such as a shared secret key and shared info.</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>"X963KDF" 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="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="key_ossl_kdf_param_key_octet_string" class="item">"key" (<strong>OSSL_KDF_PARAM_KEY</strong>) <octet string></a></strong></dt>
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<dd>
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<p>The shared secret used for key derivation.
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This parameter sets the secret.</p>
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</dd>
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<dt><strong><a name="info_ossl_kdf_param_info_octet_string" class="item">"info" (<strong>OSSL_KDF_PARAM_INFO</strong>) <octet string></a></strong></dt>
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<dd>
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<p>This parameter specifies an optional value for shared info.</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>X963KDF is very similar to the SSKDF that uses a digest as the auxiliary function,
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X963KDF appends the counter to the secret, whereas SSKDF prepends the counter.</p>
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<p>A context for X963KDF can be obtained by calling:</p>
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<pre>
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EVP_KDF *kdf = EVP_KDF_fetch(NULL, "X963KDF", NULL);
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EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf);</pre>
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<p>The output length of an X963KDF is specified via the <em>keylen</em>
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parameter to the <em>EVP_KDF_derive(3)</em> function.</p>
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<p>
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</p>
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<hr />
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<h1><a name="examples">EXAMPLES</a></h1>
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<p>This example derives 10 bytes, with the secret key "secret" and sharedinfo
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value "label":</p>
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<pre>
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EVP_KDF *kdf;
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EVP_KDF_CTX *kctx;
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unsigned char out[10];
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OSSL_PARAM params[4], *p = params;</pre>
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<pre>
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kdf = EVP_KDF_fetch(NULL, "X963KDF", NULL);
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kctx = EVP_KDF_CTX_new(kdf);
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EVP_KDF_free(kdf);</pre>
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<pre>
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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SN_sha256, strlen(SN_sha256));
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
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"secret", (size_t)6);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
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"label", (size_t)5);
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*p = OSSL_PARAM_construct_end();
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if (EVP_KDF_CTX_set_params(kctx, params) <= 0) {
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error("EVP_KDF_CTX_set_params");
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}
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if (EVP_KDF_derive(kctx, out, sizeof(out)) <= 0) {
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error("EVP_KDF_derive");
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}</pre>
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<pre>
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EVP_KDF_CTX_free(kctx);</pre>
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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>"SEC 1: Elliptic Curve Cryptography"</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_size(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 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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