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+.\" $OpenBSD: BN_cmp.3,v 1.11 2025/06/08 22:40:29 schwarze Exp $
+.\" full merge up to: OpenSSL 5b31b9df Aug 4 10:45:52 2021 +0300
+.\"
+.\" This file was written by Ulf Moeller <ulf@openssl.org>.
+.\" Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: June 8 2025 $
+.Dt BN_CMP 3
+.Os
+.Sh NAME
+.Nm BN_cmp ,
+.Nm BN_ucmp ,
+.Nm BN_is_zero ,
+.Nm BN_is_one ,
+.Nm BN_is_word ,
+.Nm BN_abs_is_word ,
+.Nm BN_is_odd
+.Nd BIGNUM comparison and test functions
+.Sh SYNOPSIS
+.Lb libcrypto
+.In openssl/bn.h
+.Ft int
+.Fo BN_cmp
+.Fa "const BIGNUM *a"
+.Fa "const BIGNUM *b"
+.Fc
+.Ft int
+.Fo BN_ucmp
+.Fa "const BIGNUM *a"
+.Fa "const BIGNUM *b"
+.Fc
+.Ft int
+.Fo BN_is_zero
+.Fa "const BIGNUM *a"
+.Fc
+.Ft int
+.Fo BN_is_one
+.Fa "const BIGNUM *a"
+.Fc
+.Ft int
+.Fo BN_is_word
+.Fa "const BIGNUM *a"
+.Fa "const BN_ULONG w"
+.Fc
+.Ft int
+.Fo BN_abs_is_word
+.Fa "const BIGNUM *a"
+.Fa "const BN_ULONG w"
+.Fc
+.Ft int
+.Fo BN_is_odd
+.Fa "const BIGNUM *a"
+.Fc
+.Sh DESCRIPTION
+.Fn BN_cmp
+compares the numbers
+.Fa a
+and
+.Fa b .
+.Fn BN_ucmp
+compares their absolute values.
+.Pp
+.Fn BN_is_zero ,
+.Fn BN_is_one
+and
+.Fn BN_is_word
+test if
+.Fa a
+equals 0, 1, or
+.Fa w
+respectively.
+.Fn BN_abs_is_word
+tests if the absolute value of
+.Fa a
+equals
+.Fa w .
+.Fn BN_is_odd
+tests if a is odd.
+.Pp
+.Vt BN_ULONG
+is a macro that expands to
+.Vt unsigned long Pq = Vt uint64_t
+on
+.Dv _LP64
+platforms and
+.Vt unsigned int Pq = Vt uint32_t
+elsewhere.
+.Sh RETURN VALUES
+.Fn BN_cmp
+returns -1 if
+.Fa a Ns < Ns Fa b ,
+0 if
+.Fa a Ns == Ns Fa b ,
+and 1 if
+.Fa a Ns > Ns Fa b .
+.Fn BN_ucmp
+is the same using the absolute values of
+.Fa a
+and
+.Fa b .
+.Pp
+.Fn BN_is_zero ,
+.Fn BN_is_one ,
+.Fn BN_is_word ,
+.Fn BN_abs_is_word ,
+and
+.Fn BN_is_odd
+return 1 if the condition is true, 0 otherwise.
+.Sh SEE ALSO
+.Xr BN_new 3
+.Sh HISTORY
+.Fn BN_cmp ,
+.Fn BN_ucmp ,
+.Fn BN_is_zero ,
+.Fn BN_is_one ,
+and
+.Fn BN_is_word
+first appeared in SSLeay 0.5.1.
+.Fn BN_is_odd
+first appeared in SSLeay 0.8.0.
+These functions have been available since
+.Ox 2.4 .
+.Pp
+.Fn BN_abs_is_word
+first appeared in OpenSSL 0.9.7 and has been available since
+.Ox 3.2 .