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BN_add_word.3
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.\" $OpenBSD: BN_add_word.3,v 1.10 2022/11/22 19:02:07 schwarze Exp $
.\" full merge up to: OpenSSL 9e183d22 Mar 11 08:56:44 2017 -0500
.\"
.\" This file was written by Ulf Moeller <ulf@openssl.org>.
.\" Copyright (c) 2000, 2005 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,
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
.\" OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: November 22 2022 $
.Dt BN_ADD_WORD 3
.Os
.Sh NAME
.Nm BN_add_word ,
.Nm BN_sub_word ,
.Nm BN_mul_word ,
.Nm BN_div_word ,
.Nm BN_mod_word
.Nd arithmetic functions on BIGNUMs with integers
.Sh SYNOPSIS
.In openssl/bn.h
.Ft int
.Fo BN_add_word
.Fa "BIGNUM *a"
.Fa "BN_ULONG w"
.Fc
.Ft int
.Fo BN_sub_word
.Fa "BIGNUM *a"
.Fa "BN_ULONG w"
.Fc
.Ft int
.Fo BN_mul_word
.Fa "BIGNUM *a"
.Fa "BN_ULONG w"
.Fc
.Ft BN_ULONG
.Fo BN_div_word
.Fa "BIGNUM *a"
.Fa "BN_ULONG w"
.Fc
.Ft BN_ULONG
.Fo BN_mod_word
.Fa "const BIGNUM *a"
.Fa "BN_ULONG w"
.Fc
.Sh DESCRIPTION
These functions perform arithmetic operations on BIGNUMs with unsigned
integers.
They are much more efficient than the normal BIGNUM arithmetic
operations.
.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.
.Pp
.Fn BN_add_word
adds
.Fa w
to
.Fa a
.Pq Li a+=w .
.Pp
.Fn BN_sub_word
subtracts
.Fa w
from
.Fa a
.Pq Li a-=w .
.Pp
.Fn BN_mul_word
multiplies
.Fa a
and
.Fa w
.Pq Li a*=w .
.Pp
.Fn BN_div_word
divides
.Fa a
by
.Fa w
.Pq Li a/=w
and returns the remainder.
.Pp
.Fn BN_mod_word
returns the remainder of
.Fa a
divided by
.Fa w
.Pq Li a%w .
.Pp
For
.Fn BN_div_word
and
.Fn BN_mod_word ,
.Fa w
must not be 0.
.Sh RETURN VALUES
.Fn BN_add_word ,
.Fn BN_sub_word ,
and
.Fn BN_mul_word
return 1 for success or 0 on error.
The error codes can be obtained by
.Xr ERR_get_error 3 .
.Pp
.Fn BN_mod_word
and
.Fn BN_div_word
return
.Fa a Ns % Ns Fa w
on success and
.Po Vt BN_ULONG Pc Ns -1
if an error occurred.
.Sh SEE ALSO
.Xr BN_add 3 ,
.Xr BN_new 3
.Sh HISTORY
.Fn BN_add_word ,
.Fn BN_div_word ,
and
.Fn BN_mod_word
first appeared in SSLeay 0.5.1.
.Fn BN_sub_word
and
.Fn BN_mul_word
first appeared in SSLeay 0.9.0.
All these functions have been available since
.Ox 2.4 .
.Pp
Before 0.9.8a, the return value for
.Fn BN_div_word
and
.Fn BN_mod_word
in case of an error was 0.