159191Skris=pod 259191Skris 359191Skris=head1 NAME 459191Skris 559191SkrisBN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd - BIGNUM comparison and test functions 659191Skris 759191Skris=head1 SYNOPSIS 859191Skris 959191Skris #include <openssl/bn.h> 1059191Skris 1159191Skris int BN_cmp(BIGNUM *a, BIGNUM *b); 1259191Skris int BN_ucmp(BIGNUM *a, BIGNUM *b); 1359191Skris 1459191Skris int BN_is_zero(BIGNUM *a); 1559191Skris int BN_is_one(BIGNUM *a); 1659191Skris int BN_is_word(BIGNUM *a, BN_ULONG w); 1759191Skris int BN_is_odd(BIGNUM *a); 1859191Skris 1959191Skris=head1 DESCRIPTION 2059191Skris 2159191SkrisBN_cmp() compares the numbers B<a> and B<b>. BN_ucmp() compares their 2259191Skrisabsolute values. 2359191Skris 2459191SkrisBN_is_zero(), BN_is_one() and BN_is_word() test if B<a> equals 0, 1, 2559191Skrisor B<w> respectively. BN_is_odd() tests if a is odd. 2659191Skris 2759191SkrisBN_is_zero(), BN_is_one(), BN_is_word() and BN_is_odd() are macros. 2859191Skris 2959191Skris=head1 RETURN VALUES 3059191Skris 3159191SkrisBN_cmp() returns -1 if B<a> E<lt> B<b>, 0 if B<a> == B<b> and 1 if 3259191SkrisB<a> E<gt> B<b>. BN_ucmp() is the same using the absolute values 3359191Skrisof B<a> and B<b>. 3459191Skris 3559191SkrisBN_is_zero(), BN_is_one() BN_is_word() and BN_is_odd() return 1 if 3659191Skristhe condition is true, 0 otherwise. 3759191Skris 3859191Skris=head1 SEE ALSO 3959191Skris 4059191SkrisL<bn(3)|bn(3)> 4159191Skris 4259191Skris=head1 HISTORY 4359191Skris 4459191SkrisBN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one() and BN_is_word() are 4559191Skrisavailable in all versions of SSLeay and OpenSSL. 4659191SkrisBN_is_odd() was added in SSLeay 0.8. 4759191Skris 4859191Skris=cut 49