5 BN_new, BN_secure_new, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
9 #include <openssl/bn.h>
13 BIGNUM *BN_secure_new(void);
15 void BN_clear(BIGNUM *a);
17 void BN_free(BIGNUM *a);
19 void BN_clear_free(BIGNUM *a);
23 BN_new() allocates and initializes a B<BIGNUM> structure.
24 BN_secure_new() does the same except that the secure heap
25 L<OPENSSL_secure_malloc(3)> is used to store the value.
27 BN_clear() is used to destroy sensitive data such as keys when they
28 are no longer needed. It erases the memory used by B<a> and sets it
30 If B<a> is NULL, nothing is done.
32 BN_free() frees the components of the B<BIGNUM>, and if it was created
33 by BN_new(), also the structure itself. BN_clear_free() additionally
34 overwrites the data before the memory is returned to the system.
35 If B<a> is NULL, nothing is done.
39 BN_new() and BN_secure_new()
40 return a pointer to the B<BIGNUM> initialised to the value 0.
41 If the allocation fails,
42 they return B<NULL> and set an error code that can be obtained
43 by L<ERR_get_error(3)>.
45 BN_clear(), BN_free() and BN_clear_free() have no return values.
49 L<ERR_get_error(3)>, L<OPENSSL_secure_malloc(3)>
53 BN_init() was removed in OpenSSL 1.1.0; use BN_new() instead.
57 Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
59 Licensed under the Apache License 2.0 (the "License"). You may not use
60 this file except in compliance with the License. You can obtain a copy
61 in the file LICENSE in the source distribution or at
62 L<https://www.openssl.org/source/license.html>.