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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_cmp</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <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="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp - public key parameter and comparison functions</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/evp.h></pre> <pre> int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey); int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);</pre> <pre> 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);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>The function <code>EVP_PKEY_missing_parameters()</code> returns 1 if the public key parameters of <strong>pkey</strong> are missing and 0 if they are present or the algorithm doesn't use parameters.</p> <p>The function <code>EVP_PKEY_copy_parameters()</code> copies the parameters from key <strong>from</strong> to key <strong>to</strong>. An error is returned if the parameters are missing in <strong>from</strong> or present in both <strong>from</strong> and <strong>to</strong> and mismatch. If the parameters in <strong>from</strong> and <strong>to</strong> are both present and match this function has no effect.</p> <p>The function <code>EVP_PKEY_cmp_parameters()</code> compares the parameters of keys <strong>a</strong> and <strong>b</strong>.</p> <p>The function <code>EVP_PKEY_cmp()</code> compares the public key components and parameters (if present) of keys <strong>a</strong> and <strong>b</strong>.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>The main purpose of the functions <code>EVP_PKEY_missing_parameters()</code> and <code>EVP_PKEY_copy_parameters()</code> 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>Since OpenSSL private keys contain public key components too the function <code>EVP_PKEY_cmp()</code> can also be used to determine if a private key matches a public key.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>The function <code>EVP_PKEY_missing_parameters()</code> returns 1 if the public key parameters of <strong>pkey</strong> are missing and 0 if they are present or the algorithm doesn't use parameters.</p> <p>These functions <code>EVP_PKEY_copy_parameters()</code> returns 1 for success and 0 for failure.</p> <p>The function <code>EVP_PKEY_cmp_parameters()</code> and <code>EVP_PKEY_cmp()</code> return 1 if the keys match, 0 if they don't match, -1 if the key types are different and -2 if the operation is not supported.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>EVP_PKEY_CTX_new(3)</em>, <em>EVP_PKEY_keygen(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (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>