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.\" ========================================================================
.\"
.IX Title "BN_add_word 3"
.TH BN_add_word 3 "2019-12-20" "1.0.2u" "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
\&\fBBN_add_word()\fR adds \fBw\fR to \fBa\fR (\f(CW\*(C`a+=w\*(C'\fR).
.PP
\&\fBBN_sub_word()\fR subtracts \fBw\fR from \fBa\fR (\f(CW\*(C`a\-=w\*(C'\fR).
.PP
\&\fBBN_mul_word()\fR multiplies \fBa\fR and \fBw\fR (\f(CW\*(C`a*=w\*(C'\fR).
.PP
\&\fBBN_div_word()\fR divides \fBa\fR by \fBw\fR (\f(CW\*(C`a/=w\*(C'\fR) and returns the remainder.
.PP
\&\fBBN_mod_word()\fR returns the remainder of \fBa\fR divided by \fBw\fR (\f(CW\*(C`a%w\*(C'\fR).
.PP
For \fBBN_div_word()\fR and \fBBN_mod_word()\fR, \fBw\fR must not be 0.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBN_add_word()\fR, \fBBN_sub_word()\fR and \fBBN_mul_word()\fR return 1 for success, 0
on error. The error codes can be obtained by \fBERR_get_error\fR\|(3).
.PP
\&\fBBN_mod_word()\fR and \fBBN_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"
\&\fBbn\fR\|(3), \fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBBN_add_word()\fR and \fBBN_mod_word()\fR are available in all versions of
SSLeay and OpenSSL. \fBBN_div_word()\fR was added in SSLeay 0.8, and
\&\fBBN_sub_word()\fR and \fBBN_mul_word()\fR in SSLeay 0.9.0.
.PP
Before 0.9.8a the return value for \fBBN_div_word()\fR and \fBBN_mod_word()\fR
in case of an error was 0.

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✏️ BN_div_word.3ssl