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.\"
.IX Title "BN_CMP 3"
.TH BN_CMP 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
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 "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bn.h>
\&
\& int BN_cmp(const BIGNUM *a, const BIGNUM *b);
\& int BN_ucmp(const BIGNUM *a, const BIGNUM *b);
\&
\& int BN_is_zero(const BIGNUM *a);
\& int BN_is_one(const BIGNUM *a);
\& int BN_is_word(const BIGNUM *a, const BN_ULONG w);
\& int BN_abs_is_word(const BIGNUM *a, const BN_ULONG w);
\& int BN_is_odd(const BIGNUM *a);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIBN_cmp()\fR compares the numbers \fIa\fR and \fIb\fR. \fIBN_ucmp()\fR compares their
absolute values.
.PP
\&\fIBN_is_zero()\fR, \fIBN_is_one()\fR, \fIBN_is_word()\fR and \fIBN_abs_is_word()\fR test if
\&\fIa\fR equals 0, 1, \fIw\fR, or |\fIw\fR| respectively.
\&\fIBN_is_odd()\fR tests if \fIa\fR is odd.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIBN_cmp()\fR returns \-1 if \fIa\fR < \fIb\fR, 0 if \fIa\fR == \fIb\fR and 1 if
\&\fIa\fR > \fIb\fR. \fIBN_ucmp()\fR is the same using the absolute values
of \fIa\fR and \fIb\fR.
.PP
\&\fIBN_is_zero()\fR, \fIBN_is_one()\fR \fIBN_is_word()\fR, \fIBN_abs_is_word()\fR and
\&\fIBN_is_odd()\fR return 1 if the condition is true, 0 otherwise.
.SH "HISTORY"
.IX Header "HISTORY"
Prior to OpenSSL 1.1.0, \fIBN_is_zero()\fR, \fIBN_is_one()\fR, \fIBN_is_word()\fR,
\&\fIBN_abs_is_word()\fR and \fIBN_is_odd()\fR were macros.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). 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
<https://www.openssl.org/source/license.html>.