2000-04-13 06:33:22 +00:00
|
|
|
=pod
|
|
|
|
|
|
|
|
|
|
=head1 NAME
|
|
|
|
|
|
|
|
|
|
BN_new, BN_init, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
|
|
|
|
|
|
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
|
|
|
|
|
|
#include <openssl/bn.h>
|
|
|
|
|
|
|
|
|
|
BIGNUM *BN_new(void);
|
|
|
|
|
|
|
|
|
|
void BN_init(BIGNUM *);
|
|
|
|
|
|
|
|
|
|
void BN_clear(BIGNUM *a);
|
|
|
|
|
|
|
|
|
|
void BN_free(BIGNUM *a);
|
|
|
|
|
|
|
|
|
|
void BN_clear_free(BIGNUM *a);
|
|
|
|
|
|
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
|
|
2006-07-29 19:10:21 +00:00
|
|
|
BN_new() allocates and initializes a B<BIGNUM> structure. BN_init()
|
2000-04-13 06:33:22 +00:00
|
|
|
initializes an existing uninitialized B<BIGNUM>.
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
|
|
|
|
|
|
BN_new() returns a pointer to the B<BIGNUM>. If the allocation fails,
|
|
|
|
|
it returns B<NULL> and sets an error code that can be obtained
|
|
|
|
|
by L<ERR_get_error(3)|ERR_get_error(3)>.
|
|
|
|
|
|
|
|
|
|
BN_init(), BN_clear(), BN_free() and BN_clear_free() have no return
|
|
|
|
|
values.
|
|
|
|
|
|
|
|
|
|
=head1 SEE ALSO
|
|
|
|
|
|
2003-01-28 21:43:22 +00:00
|
|
|
L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>
|
2000-04-13 06:33:22 +00:00
|
|
|
|
|
|
|
|
=head1 HISTORY
|
|
|
|
|
|
|
|
|
|
BN_new(), BN_clear(), BN_free() and BN_clear_free() are available in
|
|
|
|
|
all versions on SSLeay and OpenSSL. BN_init() was added in SSLeay
|
|
|
|
|
0.9.1b.
|
|
|
|
|
|
|
|
|
|
=cut
|
