NAME
BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word — BIGNUM assignment operations
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);
DESCRIPTION
BN_zero(), BN_one() and BN_set_word() set a to
the values 0, 1 and w respectively. BN_zero()
and BN_one() are macros.
BN_value_one() returns a BIGNUM constant
of value 1. This constant is useful for use in comparisons and assignment.
BN_get_word() returns a, if it can be
represented as an unsigned long.
RETURN VALUES
BN_get_word() returns the value a, and
0xffffffffL if 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.
Restrictions
Someone might change the constant.
If a BIGNUM is equal to 0xffffffffL it
can be represented as an unsigned long but this value is also returned on
error.
SEE ALSO
bn(3),
BN_bn2bin(3)
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.
