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BN_ZERO(3) FreeBSD Library Functions Manual 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(const BIGNUM *a); DESCRIPTION BN_ULONG is a macro that expands to an unsigned integral type optimized for the most efficient implementation on the local platform. It is unsigned long (= uint64_t) on _LP64 platforms and unsigned int (= uint32_t) elsewhere. BN_zero(), BN_one(), and BN_set_word() set a to the values 0, 1 and w respectively. BN_value_one() returns a BIGNUM constant of value 1. This constant is useful for comparisons and assignments. RETURN VALUES BN_get_word() returns the value a, or a number with 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. SEE ALSO BN_bn2bin(3), BN_new(3), BN_set_bit(3), BN_set_negative(3) HISTORY BN_zero(), BN_one(), BN_value_one(), and BN_set_word() first appeared in SSLeay 0.5.1. BN_get_word() first appeared in SSLeay 0.6.0. These functions have been available since OpenBSD 2.4. BUGS Someone might change the constant. If the value of a BIGNUM is equal to a BN_ULONG with all bits set, the return value of BN_get_word() collides with return value used to indicate errors. BN_ULONG should probably be a typedef rather than a macro. FreeBSD 14.1-RELEASE-p8 April 30, 2023 FreeBSD 14.1-RELEASE-p8