BN_CMP(3)

NAME
BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd - BIGNUM comparison and test functions

SYNOPSIS
#include <openssl/bn.h>
int
BN_cmp(BIGNUM *a, BIGNUM *b);
int
BN_ucmp(BIGNUM *a, BIGNUM *b);
int
BN_is_zero(BIGNUM *a);
int
BN_is_one(BIGNUM *a);
int
BN_is_word(BIGNUM *a, BN_ULONG w);
int
BN_is_odd(BIGNUM *a);

DESCRIPTION
BN_cmp() compares the numbers a and b. BN_ucmp() compares their absolute values.

BN_is_zero(), BN_is_one() and BN_is_word() test if a equals 0, 1, or w respectively. BN_is_odd() tests if a is odd.

BN_is_zero(), BN_is_one(), BN_is_word(), and BN_is_odd() are macros.

RETURN VALUES
BN_cmp() returns -1 if a<b, 0 if a==b, and 1 if a>b. BN_ucmp() is the same using the absolute values of a and b.

BN_is_zero(), BN_is_one(), BN_is_word(), and BN_is_odd() return 1 if the condition is true, 0 otherwise.

SEE ALSO
BN_new(3)

HISTORY
BN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one(), and BN_is_word() appeared before SSLeay 0.8. BN_is_odd() first appeared in SSLeay 0.8. All these functions have been available since OpenBSD 2.4.