=pod
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=head1 NAME
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BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd - BIGNUM comparison and test functions
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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int BN_cmp(BIGNUM *a, BIGNUM *b);
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int BN_ucmp(BIGNUM *a, BIGNUM *b);
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int BN_is_zero(BIGNUM *a);
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int BN_is_one(BIGNUM *a);
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int BN_is_word(BIGNUM *a, BN_ULONG w);
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int BN_is_odd(BIGNUM *a);
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=head1 DESCRIPTION
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BN_cmp() compares the numbers B<a> and B<b>. BN_ucmp() compares their
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absolute values.
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BN_is_zero(), BN_is_one() and BN_is_word() test if B<a> equals 0, 1,
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or B<w> respectively. BN_is_odd() tests if a is odd.
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BN_is_zero(), BN_is_one(), BN_is_word() and BN_is_odd() are macros.
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=head1 RETURN VALUES
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BN_cmp() returns -1 if B<a> E<lt> B<b>, 0 if B<a> == B<b> and 1 if
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B<a> E<gt> B<b>. BN_ucmp() is the same using the absolute values
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of B<a> and B<b>.
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BN_is_zero(), BN_is_one() BN_is_word() and BN_is_odd() return 1 if
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the condition is true, 0 otherwise.
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=head1 SEE ALSO
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L<bn(3)|bn(3)>
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=head1 HISTORY
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BN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one() and BN_is_word() are
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available in all versions of SSLeay and OpenSSL.
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BN_is_odd() was added in SSLeay 0.8.
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=cut
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