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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>BIO_s_core</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="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#HISTORY">HISTORY</a></li> <li><a href="#EXAMPLES">EXAMPLES</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>BIO_s_core, BIO_new_from_core_bio - OSSL_CORE_BIO functions</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/bio.h> const BIO_METHOD *BIO_s_core(void); BIO *BIO_new_from_core_bio(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>BIO_s_core() returns the core BIO method function.</p> <p>A core BIO is treated as source/sink BIO which communicates to some external BIO. This is primarily useful to provider authors. A number of calls from libcrypto into a provider supply an OSSL_CORE_BIO parameter. This represents a BIO within libcrypto, but cannot be used directly by a provider. Instead it should be wrapped using a BIO_s_core().</p> <p>Once a BIO is contructed based on BIO_s_core(), the associated OSSL_CORE_BIO object should be set on it using BIO_set_data(3). Note that the BIO will only operate correctly if it is associated with a library context constructed using OSSL_LIB_CTX_new_from_dispatch(3). To associate the BIO with a library context construct it using BIO_new_ex(3).</p> <p>BIO_new_from_core_bio() is a convenience function that constructs a new BIO based on BIO_s_core() and that is associated with the given library context. It then also sets the OSSL_CORE_BIO object on the BIO using BIO_set_data(3).</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>BIO_s_core() return a core BIO <b>BIO_METHOD</b> structure.</p> <p>BIO_new_from_core_bio() returns a BIO structure on success or NULL on failure. A failure will most commonly be because the library context was not constructed using OSSL_LIB_CTX_new_from_dispatch(3).</p> <h1 id="HISTORY">HISTORY</h1> <p>BIO_s_core() and BIO_new_from_core_bio() were added in OpenSSL 3.0.</p> <h1 id="EXAMPLES">EXAMPLES</h1> <p>Create a core BIO and write some data to it:</p> <pre><code> int some_function(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio) { BIO *cbio = BIO_new_from_core_bio(libctx, corebio); if (cbio == NULL) return 0; BIO_puts(cbio, "Hello World\n"); BIO_free(cbio); return 1; }</code></pre> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 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>