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.IX Title &quot;BN_CMP 3&quot;
.TH BN_CMP 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_abs_is_word, BN_is_odd \- BIGNUM comparison and test functions
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/bn.h&gt;
\&amp;
\&amp; int BN_cmp(const BIGNUM *a, const BIGNUM *b);
\&amp; int BN_ucmp(const BIGNUM *a, const BIGNUM *b);
\&amp;
\&amp; int BN_is_zero(const BIGNUM *a);
\&amp; int BN_is_one(const BIGNUM *a);
\&amp; int BN_is_word(const BIGNUM *a, const BN_ULONG w);
\&amp; int BN_abs_is_word(const BIGNUM *a, const BN_ULONG w);
\&amp; int BN_is_odd(const BIGNUM *a);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\fBBN_cmp()\fR compares the numbers \fIa\fR and \fIb\fR. \fBBN_ucmp()\fR compares their
absolute values.
.PP
\&amp;\fBBN_is_zero()\fR, \fBBN_is_one()\fR, \fBBN_is_word()\fR and \fBBN_abs_is_word()\fR test if
\&amp;\fIa\fR equals 0, 1, \fIw\fR, or |\fIw\fR| respectively.
\&amp;\fBBN_is_odd()\fR tests if \fIa\fR is odd.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
\&amp;\fBBN_cmp()\fR returns \-1 if \fIa\fR &lt; \fIb\fR, 0 if \fIa\fR == \fIb\fR and 1 if
\&amp;\fIa\fR &gt; \fIb\fR. \fBBN_ucmp()\fR is the same using the absolute values
of \fIa\fR and \fIb\fR.
.PP
\&amp;\fBBN_is_zero()\fR, \fBBN_is_one()\fR \fBBN_is_word()\fR, \fBBN_abs_is_word()\fR and
\&amp;\fBBN_is_odd()\fR return 1 if the condition is true, 0 otherwise.
.SH &quot;HISTORY&quot;
.IX Header &quot;HISTORY&quot;
Prior to OpenSSL 1.1.0, \fBBN_is_zero()\fR, \fBBN_is_one()\fR, \fBBN_is_word()\fR,
\&amp;\fBBN_abs_is_word()\fR and \fBBN_is_odd()\fR were macros.
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2000\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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