BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_abs_is_word, BN_is_odd, BN_are_coprime - BIGNUM

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       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                                       BN_CMP(3SSL)

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

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

       BN_are_coprime() determines if a and b are coprime.  ctx is used internally for storing temporary
       variables.  The values of a and b and ctx must not be NULL.

       Prior to OpenSSL 1.1.0, BN_is_zero(), BN_is_one(), BN_is_word(), BN_abs_is_word() and BN_is_odd() were
       macros.

       The function BN_are_coprime() was added in OpenSSL 3.1.

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

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.

       BN_are_coprime() returns 1 if the BIGNUM's are coprime, otherwise it returns 0.

        #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);

        int BN_are_coprime(BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);