=pod =head1 NAME BN_new, BN_secure_new, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs =head1 SYNOPSIS #include 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); =head1 DESCRIPTION BN_new() allocates and initializes a B 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 B and sets it to the value 0. If B is NULL, nothing is done. BN_free() frees the components of the B, 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 B is NULL, nothing is done. =head1 RETURN VALUES BN_new() and BN_secure_new() return a pointer to the B initialised to the value 0. If the allocation fails, they return B and set an error code that can be obtained by L. BN_clear(), BN_free() and BN_clear_free() have no return values. =head1 SEE ALSO L =head1 HISTORY BN_init() was removed in OpenSSL 1.1.0; use BN_new() instead. =head1 COPYRIGHT 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 L. =cut