=pod
=head1 NAME
BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment
operations
=head1 SYNOPSIS
#include
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 to the values 0, 1 and
B respectively. BN_zero() and BN_one() are macros.
BN_value_one() returns a B constant of value 1. This constant
is useful for use in comparisons and assignment.
BN_get_word() returns B, if it can be represented as an unsigned
long.
=head1 RETURN VALUES
BN_get_word() returns the value B, and 0xffffffffL if B 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 is equal to 0xffffffffL it can be represented as an
unsigned long but this value is also returned on error.
=head1 SEE ALSO
L, L
=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