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=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 SEE ALSO L<bn(3)|bn(3)> =head1 HISTORY BN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one() and BN_is_word() are available in all versions of SSLeay and OpenSSL. BN_is_odd() was added in SSLeay 0.8. =cut