BN_CMP(3)                  Library Functions Manual                  BN_CMP(3)

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

SYNOPSIS
     #include <openssl/bn.h>

     int
     BN_cmp(const BIGNUM *a, const BIGNUM *b);

     int
     BN_ucmp(const BIGNUM *a, const BIGNUM *b);

     int
     BN_is_zero(const BIGNUM *a);

     int
     BN_is_one(const BIGNUM *a);

     int
     BN_is_word(const BIGNUM *a, const BN_ULONG w);

     int
     BN_abs_is_word(const BIGNUM *a, const BN_ULONG w);

     int
     BN_is_odd(const 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_abs_is_word() tests if the absolute value of a equals
     w.  BN_is_odd() tests if a is odd.

     BN_ULONG is a macro that expands to unsigned long (= uint64_t) on _LP64
     platforms and unsigned int (= uint32_t) elsewhere.

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(), BN_abs_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() first
     appeared in SSLeay 0.5.1.  BN_is_odd() first appeared in SSLeay 0.8.0.
     These functions have been available since OpenBSD 2.4.

     BN_abs_is_word() first appeared in OpenSSL 0.9.7 and has been available
     since OpenBSD 3.2.

Linux 6.8.2-arch2-1            November 22, 2022           Linux 6.8.2-arch2-1