5 BN_new, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
9 #include <openssl/bn.h>
13 void BN_clear(BIGNUM *a);
15 void BN_free(BIGNUM *a);
17 void BN_clear_free(BIGNUM *a);
21 BN_new() allocates and initializes a B<BIGNUM> structure.
23 BN_clear() is used to destroy sensitive data such as keys when they
24 are no longer needed. It erases the memory used by B<a> and sets it
27 BN_free() frees the components of the B<BIGNUM>, and if it was created
28 by BN_new(), also the structure itself. BN_clear_free() additionally
29 overwrites the data before the memory is returned to the system.
30 If B<a> is NULL, nothing is done.
34 BN_new() returns a pointer to the B<BIGNUM>. If the allocation fails,
35 it returns B<NULL> and sets an error code that can be obtained
36 by L<ERR_get_error(3)>.
38 BN_clear(), BN_free() and BN_clear_free() have no return values.
42 L<bn(3)>, L<ERR_get_error(3)>
46 BN_init() was removed in OpenSSL 1.1.0; use BN_new() instead.
50 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
52 Licensed under the OpenSSL license (the "License"). You may not use
53 this file except in compliance with the License. You can obtain a copy
54 in the file LICENSE in the source distribution or at
55 L<https://www.openssl.org/source/license.html>.