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 SEE ALSO 39 40L<bn(3)|bn(3)> 41 42=head1 HISTORY 43 44BN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one() and BN_is_word() are 45available in all versions of SSLeay and OpenSSL. 46BN_is_odd() was added in SSLeay 0.8. 47 48=cut 49