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//opt/alt/openssl11/share/man/man3/BN_sub_word.3ssl

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.\"
.IX Title "BN_ADD_WORD 3"
.TH BN_ADD_WORD 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word \- arithmetic functions on BIGNUMs with integers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bn.h>
\&
\& int BN_add_word(BIGNUM *a, BN_ULONG w);
\&
\& int BN_sub_word(BIGNUM *a, BN_ULONG w);
\&
\& int BN_mul_word(BIGNUM *a, BN_ULONG w);
\&
\& BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
\&
\& BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
These functions perform arithmetic operations on BIGNUMs with unsigned
integers. They are much more efficient than the normal \s-1BIGNUM\s0
arithmetic operations.
.PP
\&\fIBN_add_word()\fR adds \fBw\fR to \fBa\fR (\f(CW\*(C`a+=w\*(C'\fR).
.PP
\&\fIBN_sub_word()\fR subtracts \fBw\fR from \fBa\fR (\f(CW\*(C`a\-=w\*(C'\fR).
.PP
\&\fIBN_mul_word()\fR multiplies \fBa\fR and \fBw\fR (\f(CW\*(C`a*=w\*(C'\fR).
.PP
\&\fIBN_div_word()\fR divides \fBa\fR by \fBw\fR (\f(CW\*(C`a/=w\*(C'\fR) and returns the remainder.
.PP
\&\fIBN_mod_word()\fR returns the remainder of \fBa\fR divided by \fBw\fR (\f(CW\*(C`a%w\*(C'\fR).
.PP
For \fIBN_div_word()\fR and \fIBN_mod_word()\fR, \fBw\fR must not be 0.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIBN_add_word()\fR, \fIBN_sub_word()\fR and \fIBN_mul_word()\fR return 1 for success, 0
on error. The error codes can be obtained by \fIERR_get_error\fR\|(3).
.PP
\&\fIBN_mod_word()\fR and \fIBN_div_word()\fR return \fBa\fR%\fBw\fR on success and
\&\fB(\s-1BN_ULONG\s0)\-1\fR if an error occurred.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2017 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>.