mirror of
https://github.com/openssl/openssl.git
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73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
=pod
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=head1 NAME
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BIO_s_core, BIO_new_from_core_bio - OSSL_CORE_BIO functions
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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const BIO_METHOD *BIO_s_core(void);
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BIO *BIO_new_from_core_bio(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio);
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=head1 DESCRIPTION
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BIO_s_core() returns the core BIO method function.
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A core BIO is treated as source/sink BIO which communicates to some external
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BIO. This is primarily useful to provider authors. A number of calls from
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libcrypto into a provider supply an OSSL_CORE_BIO parameter. This represents
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a BIO within libcrypto, but cannot be used directly by a provider. Instead it
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should be wrapped using a BIO_s_core().
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Once a BIO is constructed based on BIO_s_core(), the associated OSSL_CORE_BIO
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object should be set on it using BIO_set_data(3). Note that the BIO will only
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operate correctly if it is associated with a library context constructed using
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OSSL_LIB_CTX_new_from_dispatch(3). To associate the BIO with a library context
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construct it using BIO_new_ex(3).
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BIO_new_from_core_bio() is a convenience function that constructs a new BIO
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based on BIO_s_core() and that is associated with the given library context. It
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then also sets the OSSL_CORE_BIO object on the BIO using BIO_set_data(3).
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=head1 RETURN VALUES
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BIO_s_core() return a core BIO B<BIO_METHOD> structure.
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BIO_new_from_core_bio() returns a BIO structure on success or NULL on failure.
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A failure will most commonly be because the library context was not constructed
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using OSSL_LIB_CTX_new_from_dispatch(3).
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=head1 HISTORY
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BIO_s_core() and BIO_new_from_core_bio() were added in OpenSSL 3.0.
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=head1 EXAMPLES
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Create a core BIO and write some data to it:
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int some_function(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio) {
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BIO *cbio = BIO_new_from_core_bio(libctx, corebio);
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if (cbio == NULL)
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return 0;
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BIO_puts(cbio, "Hello World\n");
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BIO_free(cbio);
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return 1;
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}
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=head1 COPYRIGHT
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Copyright 2021-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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