BN_zero(3) OpenSSL BN_zero(3)
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, BN_ULONG w); BN_ULONG BN_get_word(BIGNUM *a);
DESCRIPTION
BN_ULONG is a macro that will be an unsigned integral type optimied for the most efficient implementation on the local platform. 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 a BN_ULONG.
RETURN VALUES
BN_get_word() returns the value a, or all-bits-set if a cannot be represented as a BN_ULONG. BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise. BN_value_one() returns the constant.
BUGS
If a BIGNUM is equal to the value of all-bits-set, it will collide with the error condition returned by BN_get_word() which uses that as an error value. BN_ULONG should probably be a typedef.
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. 1.0.2o 2018-03-27 BN_zero(3)
openssl 1.0.2o - Generated Thu Mar 29 07:37:33 CDT 2018