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140 .IX Title "BN_add_word 3"
141 .TH BN_add_word 3 "0.9.7a" "2003-02-19" "OpenSSL"
144 BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word \- arithmetic
145 functions on BIGNUMs with integers
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/bn.h>
152 \& int BN_add_word(BIGNUM *a, BN_ULONG w);
155 \& int BN_sub_word(BIGNUM *a, BN_ULONG w);
158 \& int BN_mul_word(BIGNUM *a, BN_ULONG w);
161 \& BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
164 \& BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
167 .IX Header "DESCRIPTION"
168 These functions perform arithmetic operations on BIGNUMs with unsigned
169 integers. They are much more efficient than the normal \s-1BIGNUM\s0
170 arithmetic operations.
172 \&\fIBN_add_word()\fR adds \fBw\fR to \fBa\fR (\f(CW\*(C`a+=w\*(C'\fR).
174 \&\fIBN_sub_word()\fR subtracts \fBw\fR from \fBa\fR (\f(CW\*(C`a\-=w\*(C'\fR).
176 \&\fIBN_mul_word()\fR multiplies \fBa\fR and \fBw\fR (\f(CW\*(C`a*=b\*(C'\fR).
178 \&\fIBN_div_word()\fR divides \fBa\fR by \fBw\fR (\f(CW\*(C`a/=w\*(C'\fR) and returns the remainder.
180 \&\fIBN_mod_word()\fR returns the remainder of \fBa\fR divided by \fBw\fR (\f(CW\*(C`a%m\*(C'\fR).
182 For \fIBN_div_word()\fR and \fIBN_mod_word()\fR, \fBw\fR must not be 0.
184 .IX Header "RETURN VALUES"
185 \&\fIBN_add_word()\fR, \fIBN_sub_word()\fR and \fIBN_mul_word()\fR return 1 for success, 0
186 on error. The error codes can be obtained by ERR_get_error(3).
188 \&\fIBN_mod_word()\fR and \fIBN_div_word()\fR return \fBa\fR%\fBw\fR.
190 .IX Header "SEE ALSO"
191 bn(3), ERR_get_error(3), BN_add(3)
194 \&\fIBN_add_word()\fR and \fIBN_mod_word()\fR are available in all versions of
195 SSLeay and OpenSSL. \fIBN_div_word()\fR was added in SSLeay 0.8, and
196 \&\fIBN_sub_word()\fR and \fIBN_mul_word()\fR in SSLeay 0.9.0.