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BN_CTX_NEW(3) OpenSSL BN_CTX_NEW(3)

NAME

BN_CTX_new, BN_CTX_secure_new, BN_CTX_free - allocate and free BN_CTX structures

SYNOPSIS

 #include <openssl/bn.h>
 BN_CTX *BN_CTX_new(void);
 BN_CTX *BN_CTX_secure_new(void);
 void BN_CTX_free(BN_CTX *c);

DESCRIPTION

A BN_CTX is a structure that holds BIGNUM temporary variables used by library functions. Since dynamic memory allocation to create BIGNUMs is rather expensive when used in conjunction with repeated subroutine calls, the BN_CTX structure is used.
BN_CTX_new() allocates and initializes a BN_CTX structure. BN_CTX_secure_new() allocates and initializes a BN_CTX structure but uses the secure heap (see CRYPTO_secure_malloc(3)) to hold the BIGNUMs.
BN_CTX_free() frees the components of the BN_CTX, and if it was created by BN_CTX_new(), also the structure itself. If BN_CTX_start(3) has been used on the BN_CTX, BN_CTX_end(3) must be called before the BN_CTX may be freed by BN_CTX_free(). If c is NULL, nothing is done.

RETURN VALUES

BN_CTX_new() and BN_CTX_secure_new() return a pointer to the BN_CTX. If the allocation fails, they return NULL and sets an error code that can be obtained by ERR_get_error(3).
BN_CTX_free() has no return values.

REMOVED FUNCTIONALITY

 void BN_CTX_init(BN_CTX *c);
BN_CTX_init() is no longer available as of OpenSSL 1.1.0. Applications should replace use of BN_CTX_init with BN_CTX_new instead:
 BN_CTX *ctx;
 ctx = BN_CTX_new();
 if(!ctx) /* Handle error */
 ...
 BN_CTX_free(ctx);

SEE ALSO

ERR_get_error(3), BN_add(3), BN_CTX_start(3)

HISTORY

BN_CTX_init() was removed in OpenSSL 1.1.0.

COPYRIGHT

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
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 <https://www.openssl.org/source/license.html>.
2017-11-02 1.1.0g