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, or 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.

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.

BUGS

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.