=pod

=head1 NAME

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

=head1 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);

=head1 DESCRIPTION

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

BN_is_zero(), BN_is_one() and BN_is_word() test if B<a> equals 0, 1,
or B<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.

=head1 RETURN VALUES

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

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

=head1 COPYRIGHT

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

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
L<https://www.openssl.org/source/license.html>.

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