1=pod 2 3=head1 NAME 4 5BIO_s_core, BIO_new_from_core_bio - OSSL_CORE_BIO functions 6 7=head1 SYNOPSIS 8 9 #include <openssl/bio.h> 10 11 const BIO_METHOD *BIO_s_core(void); 12 13 BIO *BIO_new_from_core_bio(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio); 14 15=head1 DESCRIPTION 16 17BIO_s_core() returns the core BIO method function. 18 19A core BIO is treated as source/sink BIO which communicates to some external 20BIO. This is primarily useful to provider authors. A number of calls from 21libcrypto into a provider supply an OSSL_CORE_BIO parameter. This represents 22a BIO within libcrypto, but cannot be used directly by a provider. Instead it 23should be wrapped using a BIO_s_core(). 24 25Once a BIO is constructed based on BIO_s_core(), the associated OSSL_CORE_BIO 26object should be set on it using BIO_set_data(3). Note that the BIO will only 27operate correctly if it is associated with a library context constructed using 28OSSL_LIB_CTX_new_from_dispatch(3). To associate the BIO with a library context 29construct it using BIO_new_ex(3). 30 31BIO_new_from_core_bio() is a convenience function that constructs a new BIO 32based on BIO_s_core() and that is associated with the given library context. It 33then also sets the OSSL_CORE_BIO object on the BIO using BIO_set_data(3). 34 35=head1 RETURN VALUES 36 37BIO_s_core() return a core BIO B<BIO_METHOD> structure. 38 39BIO_new_from_core_bio() returns a BIO structure on success or NULL on failure. 40A failure will most commonly be because the library context was not constructed 41using OSSL_LIB_CTX_new_from_dispatch(3). 42 43=head1 HISTORY 44 45BIO_s_core() and BIO_new_from_core_bio() were added in OpenSSL 3.0. 46 47=head1 EXAMPLES 48 49Create a core BIO and write some data to it: 50 51 int some_function(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio) { 52 BIO *cbio = BIO_new_from_core_bio(libctx, corebio); 53 54 if (cbio == NULL) 55 return 0; 56 57 BIO_puts(cbio, "Hello World\n"); 58 59 BIO_free(cbio); 60 return 1; 61 } 62 63=head1 COPYRIGHT 64 65Copyright 2021-2023 The OpenSSL Project Authors. All Rights Reserved. 66 67Licensed under the Apache License 2.0 (the "License"). You may not use 68this file except in compliance with the License. You can obtain a copy 69in the file LICENSE in the source distribution or at 70L<https://www.openssl.org/source/license.html>. 71 72=cut 73