BN_CTX_new, BN_CTX_secure_new, BN_CTX_free - allocate and free BN_CTX structures
#include <openssl/bn.h>
BN_CTX *BN_CTX_new(void);
BN_CTX *BN_CTX_secure_new(void);
void BN_CTX_free(BN_CTX *c);
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 BN_CTX_start(3) has been used on the BN_CTX, 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 REMOVED FUNCTIONALITY
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_add(3), HISTORY
BN_CTX_init() was removed in OpenSSL 1.1.0. 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. void BN_CTX_init(BN_CTX *c);
BN_CTX *ctx;
ctx = BN_CTX_new();
if(!ctx) /* Handle error */
...
BN_CTX_free(ctx);
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