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Editing: BN_is_zero.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd \- BIGNUM comparison and test functions .SH "SYNOPSIS" .IX 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_cmp()\fR compares the numbers \fBa\fR and \fBb\fR. \fBBN_ucmp()\fR compares their absolute values. .PP \&\fBBN_is_zero()\fR, \fBBN_is_one()\fR and \fBBN_is_word()\fR test if \fBa\fR equals 0, 1, or \fBw\fR respectively. \fBBN_is_odd()\fR tests if a is odd. .PP \&\fBBN_is_zero()\fR, \fBBN_is_one()\fR, \fBBN_is_word()\fR and \fBBN_is_odd()\fR are macros. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_cmp()\fR returns \-1 if \fBa\fR < \fBb\fR, 0 if \fBa\fR == \fBb\fR and 1 if \&\fBa\fR > \fBb\fR. \fBBN_ucmp()\fR is the same using the absolute values of \fBa\fR and \fBb\fR. .PP \&\fBBN_is_zero()\fR, \fBBN_is_one()\fR \fBBN_is_word()\fR and \fBBN_is_odd()\fR return 1 if the condition is true, 0 otherwise. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbn\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_cmp()\fR, \fBBN_ucmp()\fR, \fBBN_is_zero()\fR, \fBBN_is_one()\fR and \fBBN_is_word()\fR are available in all versions of SSLeay and OpenSSL. \&\fBBN_is_odd()\fR was added in SSLeay 0.8.
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