1BIO_S_CORE(3ossl)                   OpenSSL                  BIO_S_CORE(3ossl)
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NAME

6       BIO_s_core, BIO_new_from_core_bio - OSSL_CORE_BIO functions
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SYNOPSIS

9        #include <openssl/bio.h>
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11        const BIO_METHOD *BIO_s_core(void);
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13        BIO *BIO_new_from_core_bio(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio);
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DESCRIPTION

16       BIO_s_core() returns the core BIO method function.
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18       A core BIO is treated as source/sink BIO which communicates to some
19       external BIO. This is primarily useful to provider authors. A number of
20       calls from libcrypto into a provider supply an OSSL_CORE_BIO parameter.
21       This represents a BIO within libcrypto, but cannot be used directly by
22       a provider. Instead it should be wrapped using a BIO_s_core().
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24       Once a BIO is contructed based on BIO_s_core(), the associated
25       OSSL_CORE_BIO object should be set on it using BIO_set_data(3). Note
26       that the BIO will only operate correctly if it is associated with a
27       library context constructed using OSSL_LIB_CTX_new_from_dispatch(3). To
28       associate the BIO with a library context construct it using
29       BIO_new_ex(3).
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31       BIO_new_from_core_bio() is a convenience function that constructs a new
32       BIO based on BIO_s_core() and that is associated with the given library
33       context. It then also sets the OSSL_CORE_BIO object on the BIO using
34       BIO_set_data(3).
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RETURN VALUES

37       BIO_s_core() return a core BIO BIO_METHOD structure.
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39       BIO_new_from_core_bio() returns a BIO structure on success or NULL on
40       failure.  A failure will most commonly be because the library context
41       was not constructed using OSSL_LIB_CTX_new_from_dispatch(3).
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HISTORY

44       BIO_s_core() and BIO_new_from_core_bio() were added in OpenSSL 3.0.
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EXAMPLES

47       Create a core BIO and write some data to it:
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49        int some_function(OSSL_LIB_CTX *libctx, OSSL_CORE_BIO *corebio) {
50            BIO *cbio = BIO_new_from_core_bio(libctx, corebio);
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52            if (cbio == NULL)
53                return 0;
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55            BIO_puts(cbio, "Hello World\n");
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57            BIO_free(cbio);
58            return 1;
59        }
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62       Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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64       Licensed under the Apache License 2.0 (the "License").  You may not use
65       this file except in compliance with the License.  You can obtain a copy
66       in the file LICENSE in the source distribution or at
67       <https://www.openssl.org/source/license.html>.
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713.0.5                             2022-07-05                 BIO_S_CORE(3ossl)
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