35fd99538a
Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/9034)
64 lines
1.6 KiB
Text
64 lines
1.6 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
BN_new, BN_secure_new, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#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);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
BN_new() allocates and initializes a B<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 B<a> and sets it
|
|
to the value 0.
|
|
If B<a> is NULL, nothing is done.
|
|
|
|
BN_free() frees the components of the B<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 B<a> is NULL, nothing is done.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
BN_new() and BN_secure_new()
|
|
return a pointer to the B<BIGNUM> initialised to the value 0.
|
|
If the allocation fails,
|
|
they return B<NULL> and set an error code that can be obtained
|
|
by L<ERR_get_error(3)>.
|
|
|
|
BN_clear(), BN_free() and BN_clear_free() have no return values.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ERR_get_error(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
BN_init() was removed in OpenSSL 1.1.0; use BN_new() instead.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2019 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|