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<?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_PKEY_copy_parameters</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body style="background-color: white"> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#NOTES">NOTES</a></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_missing_parameters, EVP_PKEY_copy_parameters, EVP_PKEY_parameters_eq, EVP_PKEY_cmp_parameters, EVP_PKEY_eq, EVP_PKEY_cmp - public key parameter and comparison functions</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/evp.h> int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey); int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from); int EVP_PKEY_parameters_eq(const EVP_PKEY *a, const EVP_PKEY *b); int EVP_PKEY_eq(const EVP_PKEY *a, const EVP_PKEY *b);</code></pre> <p>The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining <b>OPENSSL_API_COMPAT</b> with a suitable version value, see <a href="../man7/openssl_user_macros.html">openssl_user_macros(7)</a>:</p> <pre><code> int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b); int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>The function EVP_PKEY_missing_parameters() returns 1 if the public key parameters of <b>pkey</b> are missing and 0 if they are present or the algorithm doesn't use parameters.</p> <p>The function EVP_PKEY_copy_parameters() copies the parameters from key <b>from</b> to key <b>to</b>. An error is returned if the parameters are missing in <b>from</b> or present in both <b>from</b> and <b>to</b> and mismatch. If the parameters in <b>from</b> and <b>to</b> are both present and match this function has no effect.</p> <p>The function EVP_PKEY_parameters_eq() checks the parameters of keys <b>a</b> and <b>b</b> for equality.</p> <p>The function EVP_PKEY_eq() checks the keys <b>a</b> and <b>b</b> for equality, including their parameters if they are available.</p> <h1 id="NOTES">NOTES</h1> <p>The main purpose of the functions EVP_PKEY_missing_parameters() and EVP_PKEY_copy_parameters() is to handle public keys in certificates where the parameters are sometimes omitted from a public key if they are inherited from the CA that signed it.</p> <p>The deprecated functions EVP_PKEY_cmp() and EVP_PKEY_cmp_parameters() differ in their return values compared to other _cmp() functions. They are aliases for EVP_PKEY_eq() and EVP_PKEY_parameters_eq().</p> <p>The function EVP_PKEY_cmp() previously only checked the key parameters (if there are any) and the public key, assuming that there always was a public key and that private key equality could be derived from that. Because it's no longer assumed that the private key in an <a href="../man3/EVP_PKEY.html">EVP_PKEY(3)</a> is always accompanied by a public key, the comparison can not rely on public key comparison alone.</p> <p>Instead, EVP_PKEY_eq() (and therefore also EVP_PKEY_cmp()) now compares:</p> <ol> <li><p>the key parameters (if there are any)</p> </li> <li><p>the public keys or the private keys of the two <b>EVP_PKEY</b>s, depending on what they both contain.</p> </li> </ol> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>The function EVP_PKEY_missing_parameters() returns 1 if the public key parameters of <b>pkey</b> are missing and 0 if they are present or the algorithm doesn't use parameters.</p> <p>These functions EVP_PKEY_copy_parameters() returns 1 for success and 0 for failure.</p> <p>The functions EVP_PKEY_cmp_parameters(), EVP_PKEY_parameters_eq(), EVP_PKEY_cmp() and EVP_PKEY_eq() return 1 if their inputs match, 0 if they don't match, -1 if the key types are different and -2 if the operation is not supported.</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_keygen.html">EVP_PKEY_keygen(3)</a></p> <h1 id="HISTORY">HISTORY</h1> <p>The EVP_PKEY_cmp() and EVP_PKEY_cmp_parameters() functions were deprecated in OpenSSL 3.0.</p> <p>The EVP_PKEY_eq() and EVP_PKEY_parameters_eq() were added in OpenSSL 3.0 to replace EVP_PKEY_cmp() and EVP_PKEY_cmp_parameters().</p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2006-2021 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> </body> </html>