=pod
|
|
=head1 NAME
|
|
BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment
|
operations
|
|
=head1 SYNOPSIS
|
|
#include <openssl/bn.h>
|
|
int BN_zero(BIGNUM *a);
|
int BN_one(BIGNUM *a);
|
|
const BIGNUM *BN_value_one(void);
|
|
int BN_set_word(BIGNUM *a, unsigned long w);
|
unsigned long BN_get_word(BIGNUM *a);
|
|
=head1 DESCRIPTION
|
|
BN_zero(), BN_one() and BN_set_word() set B<a> to the values 0, 1 and
|
B<w> respectively. BN_zero() and BN_one() are macros.
|
|
BN_value_one() returns a B<BIGNUM> constant of value 1. This constant
|
is useful for use in comparisons and assignment.
|
|
BN_get_word() returns B<a>, if it can be represented as an unsigned
|
long.
|
|
=head1 RETURN VALUES
|
|
BN_get_word() returns the value B<a>, and 0xffffffffL if B<a> cannot
|
be represented as an unsigned long.
|
|
BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise.
|
BN_value_one() returns the constant.
|
|
=head1 BUGS
|
|
Someone might change the constant.
|
|
If a B<BIGNUM> is equal to 0xffffffffL it can be represented as an
|
unsigned long but this value is also returned on error.
|
|
=head1 SEE ALSO
|
|
L<bn(3)|bn(3)>, L<BN_bn2bin(3)|BN_bn2bin(3)>
|
|
=head1 HISTORY
|
|
BN_zero(), BN_one() and BN_set_word() are available in all versions of
|
SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in
|
SSLeay 0.8.
|
|
BN_value_one() was changed to return a true const BIGNUM * in OpenSSL
|
0.9.7.
|
|
=cut
|
