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+.\" $OpenBSD: BN_zero.3,v 1.16 2025/12/15 12:09:46 tb Exp $
+.\" full merge up to: OpenSSL a528d4f0 Oct 27 13:40:11 2015 -0400
+.\" selective merge up to: OpenSSL b713c4ff Jan 22 14:41:09 2018 -0500
+.\"
+.\" This file is a derived work.
+.\" The changes are covered by the following Copyright and license:
+.\"
+.\" Copyright (c) 2021, 2022 Ingo Schwarze <schwarze@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" The original file was written by Ulf Moeller <ulf@openssl.org>.
+.\" Copyright (c) 2000, 2001, 2018 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: December 15 2025 $
+.Dt BN_ZERO 3
+.Os
+.Sh NAME
+.Nm BN_zero ,
+.Nm BN_one ,
+.Nm BN_value_one ,
+.Nm BN_set_word ,
+.Nm BN_get_word
+.Nd BIGNUM assignment operations
+.Sh SYNOPSIS
+.Lb libcrypto
+.In openssl/bn.h
+.Ft void
+.Fo BN_zero
+.Fa "BIGNUM *a"
+.Fc
+.Ft int
+.Fo BN_one
+.Fa "BIGNUM *a"
+.Fc
+.Ft const BIGNUM *
+.Fo BN_value_one
+.Fa void
+.Fc
+.Ft int
+.Fo BN_set_word
+.Fa "BIGNUM *a"
+.Fa "BN_ULONG w"
+.Fc
+.Ft BN_ULONG
+.Fo BN_get_word
+.Fa "const BIGNUM *a"
+.Fc
+.Sh DESCRIPTION
+.Vt BN_ULONG
+is a macro that expands to an unsigned integral type optimized
+for the most efficient implementation on the local platform.
+It is
+.Vt unsigned long Pq = Vt uint64_t
+on
+.Dv _LP64
+platforms and
+.Vt unsigned int Pq = Vt uint32_t
+elsewhere.
+.Pp
+.Fn BN_zero ,
+.Fn BN_one ,
+and
+.Fn BN_set_word
+set
+.Fa a
+to the values 0, 1 and
+.Fa w
+respectively.
+.Pp
+.Fn BN_value_one
+returns a
+.Vt BIGNUM
+constant of value 1.
+This constant is useful for comparisons and assignments.
+.Sh RETURN VALUES
+.Fn BN_get_word
+returns the value
+.Fa a ,
+or (BN_ULONG)\-1 if
+.Fa a
+cannot be represented as a
+.Vt BN_ULONG .
+.Pp
+.Fn BN_one
+and
+.Fn BN_set_word
+return 1 on success, 0 otherwise.
+.Fn BN_value_one
+returns the constant.
+.Sh SEE ALSO
+.Xr BN_bn2bin 3 ,
+.Xr BN_new 3 ,
+.Xr BN_set_bit 3 ,
+.Xr BN_set_negative 3
+.Sh HISTORY
+.Fn BN_zero ,
+.Fn BN_one ,
+.Fn BN_value_one ,
+and
+.Fn BN_set_word
+first appeared in SSLeay 0.5.1.
+.Fn BN_get_word
+first appeared in SSLeay 0.6.0.
+These functions have been available since
+.Ox 2.4 .
+.Sh BUGS
+Someone might change the constant.
+.Pp
+If the value of a
+.Vt BIGNUM
+is equal to a
+.Vt BN_ULONG
+with all bits set, the return value of
+.Fn BN_get_word
+collides with return value used to indicate errors.
+.Pp
+.Vt BN_ULONG
+should probably be a typedef rather than a macro.