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Title "BN_cmp 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd - BIGNUM comparison and test functions Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" \fIBN_cmp() compares the numbers a and b. BN_ucmp() compares their absolute values.

\fIBN_is_zero(), BN_is_one() and BN_is_word() test if a equals 0, 1, or w respectively. BN_is_odd() tests if a is odd.

\fIBN_is_zero(), BN_is_one(), BN_is_word() and BN_is_odd() are macros.

Header "RETURN VALUES" \fIBN_cmp() returns -1 if a < b, 0 if a == b and 1 if \fBa > b. BN_ucmp() is the same using the absolute values of a and b.

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

Header "SEE ALSO" \fIbn\|(3) Header "HISTORY" \fIBN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one() and BN_is_word() are available in all versions of SSLeay and OpenSSL. \fIBN_is_odd() was added in SSLeay 0.8.