BN_new, BN_secure_new, BN_clear, BN_free, BN_clear_free - allocate and free
BIGNUMs
#include <openssl/bn.h>
BIGNUM *BN_new(void);
BIGNUM *BN_secure_new(void);
void BN_clear(BIGNUM *a);
void BN_free(BIGNUM *a);
void BN_clear_free(BIGNUM *a);
BN_new() allocates and initializes a
BIGNUM structure.
BN_secure_new() does the same except that the secure heap
OPENSSL_secure_malloc(3) is used to store the value.
BN_clear() is used to destroy sensitive data such as keys when they are
no longer needed. It erases the memory used by
a and sets it to the
value 0. If
a is NULL, nothing is done.
BN_free() frees the components of the
BIGNUM, and if it was
created by
BN_new(), also the structure itself.
BN_clear_free()
additionally overwrites the data before the memory is returned to the system.
If
a is NULL, nothing is done.
BN_new() and
BN_secure_new() return a pointer to the
BIGNUM
initialised to the value 0. If the allocation fails, they return
NULL
and set an error code that can be obtained by
ERR_get_error(3).
BN_clear(),
BN_free() and
BN_clear_free() have no return
values.
ERR_get_error(3),
OPENSSL_secure_malloc(3)
BN_init() was removed in OpenSSL 1.1.0; use
BN_new() instead.
Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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>.