NetBSD/lib/libcrypto/man/BN_add_word.3

.\"	$NetBSD: BN_add_word.3,v 1.12 2003/07/24 14:16:37 itojun Exp $
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.IX Title "BN_add_word 3"
.TH BN_add_word 3 "0.9.7b" "2002-09-25" "OpenSSL"
.UC
.SH "NAME"
BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word \- arithmetic
functions on BIGNUMs with integers
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bn.h>
.Ve
.Vb 1
\& int BN_add_word(BIGNUM *a, BN_ULONG w);
.Ve
.Vb 1
\& int BN_sub_word(BIGNUM *a, BN_ULONG w);
.Ve
.Vb 1
\& int BN_mul_word(BIGNUM *a, BN_ULONG w);
.Ve
.Vb 1
\& BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
.Ve
.Vb 1
\& 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*=b\*(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%m\*(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 ERR_get_error(3).
.PP
\&\fIBN_mod_word()\fR and \fIBN_div_word()\fR return \fBa\fR%\fBw\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
openssl_bn(3), ERR_get_error(3), BN_add(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fIBN_add_word()\fR and \fIBN_mod_word()\fR are available in all versions of
SSLeay and OpenSSL. \fIBN_div_word()\fR was added in SSLeay 0.8, and
\&\fIBN_sub_word()\fR and \fIBN_mul_word()\fR in SSLeay 0.9.0.