1=pod 2 3=head1 NAME 4 5BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd - BIGNUM comparison and test functions 6 7=head1 SYNOPSIS 8 9 #include <openssl/bn.h> 10 11 int BN_cmp(BIGNUM *a, BIGNUM *b); 12 int BN_ucmp(BIGNUM *a, BIGNUM *b); 13 14 int BN_is_zero(BIGNUM *a); 15 int BN_is_one(BIGNUM *a); 16 int BN_is_word(BIGNUM *a, BN_ULONG w); 17 int BN_is_odd(BIGNUM *a); 18 19=head1 DESCRIPTION 20 21BN_cmp() compares the numbers B<a> and B<b>. BN_ucmp() compares their 22absolute values. 23 24BN_is_zero(), BN_is_one() and BN_is_word() test if B<a> equals 0, 1, 25or B<w> respectively. BN_is_odd() tests if a is odd. 26 27BN_is_zero(), BN_is_one(), BN_is_word() and BN_is_odd() are macros. 28 29=head1 RETURN VALUES 30 31BN_cmp() returns -1 if B<a> E<lt> B<b>, 0 if B<a> == B<b> and 1 if 32B<a> E<gt> B<b>. BN_ucmp() is the same using the absolute values 33of B<a> and B<b>. 34 35BN_is_zero(), BN_is_one() BN_is_word() and BN_is_odd() return 1 if 36the condition is true, 0 otherwise. 37 38=head1 COPYRIGHT 39 40Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. 41 42Licensed under the OpenSSL license (the "License"). You may not use 43this file except in compliance with the License. You can obtain a copy 44in the file LICENSE in the source distribution or at 45L<https://www.openssl.org/source/license.html>. 46 47=cut 48