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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_CTX_new</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="#history">HISTORY</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_CTX_new, EVP_PKEY_CTX_new_id, EVP_PKEY_CTX_dup, EVP_PKEY_CTX_free - public key algorithm context functions</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/evp.h></pre> <pre> EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e); EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e); EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *ctx); void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>The <code>EVP_PKEY_CTX_new()</code> function allocates public key algorithm context using the algorithm specified in <strong>pkey</strong> and ENGINE <strong>e</strong>.</p> <p>The <code>EVP_PKEY_CTX_new_id()</code> function allocates public key algorithm context using the algorithm specified by <strong>id</strong> and ENGINE <strong>e</strong>. It is normally used when no <strong>EVP_PKEY</strong> structure is associated with the operations, for example during parameter generation of key generation for some algorithms.</p> <p><code>EVP_PKEY_CTX_dup()</code> duplicates the context <strong>ctx</strong>.</p> <p><code>EVP_PKEY_CTX_free()</code> frees up the context <strong>ctx</strong>. If <strong>ctx</strong> is NULL, nothing is done.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>The <strong>EVP_PKEY_CTX</strong> structure is an opaque public key algorithm context used by the OpenSSL high-level public key API. Contexts <strong>MUST NOT</strong> be shared between threads: that is it is not permissible to use the same context simultaneously in two threads.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p><code>EVP_PKEY_CTX_new()</code>, <code>EVP_PKEY_CTX_new_id()</code>, <code>EVP_PKEY_CTX_dup()</code> returns either the newly allocated <strong>EVP_PKEY_CTX</strong> structure of <strong>NULL</strong> if an error occurred.</p> <p><code>EVP_PKEY_CTX_free()</code> does not return a value.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>EVP_PKEY_new(3)</em></p> <p> </p> <hr /> <h1><a name="history">HISTORY</a></h1> <p>These functions were added in OpenSSL 1.0.0.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2006-2020 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>