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<title>EVP_PKEY_CTX_set_params</title>
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<ul id="index">
<li><a href="#NAME">NAME</a></li>
<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#DESCRIPTION">DESCRIPTION</a>
<ul>
<li><a href="#Parameters">Parameters</a></li>
</ul>
</li>
<li><a href="#RETURN-VALUES">RETURN VALUES</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>
<h1 id="NAME">NAME</h1>
<p>EVP_PKEY_CTX_set_params, EVP_PKEY_CTX_settable_params, EVP_PKEY_CTX_get_params, EVP_PKEY_CTX_gettable_params - provider parameter passing operations</p>
<h1 id="SYNOPSIS">SYNOPSIS</h1>
<pre><code> #include <openssl/evp.h>
int EVP_PKEY_CTX_set_params(EVP_PKEY_CTX *ctx, const OSSL_PARAM *params);
const OSSL_PARAM *EVP_PKEY_CTX_settable_params(const EVP_PKEY_CTX *ctx);
int EVP_PKEY_CTX_get_params(EVP_PKEY_CTX *ctx, OSSL_PARAM *params);
const OSSL_PARAM *EVP_PKEY_CTX_gettable_params(const EVP_PKEY_CTX *ctx);</code></pre>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>The EVP_PKEY_CTX_get_params() and EVP_PKEY_CTX_set_params() functions allow transfer of arbitrary key parameters to and from providers. Not all parameters may be supported by all providers. See <a href="../man3/OSSL_PROVIDER.html">OSSL_PROVIDER(3)</a> for more information on providers. See <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a> for more information on parameters. These functions must only be called after the EVP_PKEY_CTX has been initialised for use in an operation. These methods replace the EVP_PKEY_CTX_ctrl() mechanism. (EVP_PKEY_CTX_ctrl now calls these methods internally to interact with providers).</p>
<p>EVP_PKEY_CTX_gettable_params() and EVP_PKEY_CTX_settable_params() get a constant <b>OSSL_PARAM</b> array that describes the gettable and settable parameters for the current algorithm implementation, i.e. parameters that can be used with EVP_PKEY_CTX_get_params() and EVP_PKEY_CTX_set_params() respectively. See <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a> for the use of <b>OSSL_PARAM</b> as parameter descriptor. These functions must only be called after the EVP_PKEY_CTX has been initialised for use in an operation.</p>
<h2 id="Parameters">Parameters</h2>
<p>Examples of EVP_PKEY parameters include the following:</p>
<p><a href="../man7/provider-keymgmt.html">"Common parameters" in provider-keymgmt(7)</a> <a href="../man7/provider-keyexch.html">"Key Exchange parameters" in provider-keyexch(7)</a> <a href="../man7/provider-signature.html">"Signature parameters" in provider-signature(7)</a></p>
<p><a href="../man7/EVP_PKEY-RSA.html">"Common RSA parameters" in EVP_PKEY-RSA(7)</a> <a href="../man7/EVP_PKEY-RSA.html">"RSA key generation parameters" in EVP_PKEY-RSA(7)</a> <a href="../man7/EVP_PKEY-FFC.html">"FFC parameters" in EVP_PKEY-FFC(7)</a> <a href="../man7/EVP_PKEY-FFC.html">"FFC key generation parameters" in EVP_PKEY-FFC(7)</a> <a href="../man7/EVP_PKEY-DSA.html">"DSA parameters" in EVP_PKEY-DSA(7)</a> <a href="../man7/EVP_PKEY-DSA.html">"DSA key generation parameters" in EVP_PKEY-DSA(7)</a> <a href="../man7/EVP_PKEY-DH.html">"DH parameters" in EVP_PKEY-DH(7)</a> <a href="../man7/EVP_PKEY-DH.html">"DH key generation parameters" in EVP_PKEY-DH(7)</a> <a href="../man7/EVP_PKEY-EC.html">"Common EC parameters" in EVP_PKEY-EC(7)</a> <a href="../man7/EVP_PKEY-X25519.html">"Common X25519, X448, ED25519 and ED448 parameters" in EVP_PKEY-X25519(7)</a></p>
<h1 id="RETURN-VALUES">RETURN VALUES</h1>
<p>EVP_PKEY_CTX_set_params() returns 1 for success or 0 otherwise. EVP_PKEY_CTX_settable_params() returns an OSSL_PARAM array on success or NULL on error. It may also return NULL if there are no settable parameters available.</p>
<p>All other functions and macros described on this page return a positive value 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>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p><a href="../man3/EVP_PKEY_CTX_new.html">EVP_PKEY_CTX_new(3)</a>, <a href="../man3/EVP_PKEY_encrypt.html">EVP_PKEY_encrypt(3)</a>, <a href="../man3/EVP_PKEY_decrypt.html">EVP_PKEY_decrypt(3)</a>, <a href="../man3/EVP_PKEY_sign.html">EVP_PKEY_sign(3)</a>, <a href="../man3/EVP_PKEY_verify.html">EVP_PKEY_verify(3)</a>, <a href="../man3/EVP_PKEY_verify_recover.html">EVP_PKEY_verify_recover(3)</a>, <a href="../man3/EVP_PKEY_derive.html">EVP_PKEY_derive(3)</a>, <a href="../man3/EVP_PKEY_keygen.html">EVP_PKEY_keygen(3)</a></p>
<h1 id="HISTORY">HISTORY</h1>
<p>All functions were added in OpenSSL 3.0.</p>
<h1 id="COPYRIGHT">COPYRIGHT</h1>
<p>Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.</p>
<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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