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126 .IX Title "BN_add_word 3"
127 .TH BN_add_word 3 "2007-10-24" "0.9.8g" "OpenSSL"
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133 BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word \- arithmetic
134 functions on BIGNUMs with integers
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/bn.h>
140 \& int BN_add_word(BIGNUM *a, BN_ULONG w);
142 \& int BN_sub_word(BIGNUM *a, BN_ULONG w);
144 \& int BN_mul_word(BIGNUM *a, BN_ULONG w);
146 \& BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
148 \& BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
151 .IX Header "DESCRIPTION"
152 These functions perform arithmetic operations on BIGNUMs with unsigned
153 integers. They are much more efficient than the normal \s-1BIGNUM\s0
154 arithmetic operations.
156 \&\fIBN_add_word()\fR adds \fBw\fR to \fBa\fR (\f(CW\*(C`a+=w\*(C'\fR).
158 \&\fIBN_sub_word()\fR subtracts \fBw\fR from \fBa\fR (\f(CW\*(C`a\-=w\*(C'\fR).
160 \&\fIBN_mul_word()\fR multiplies \fBa\fR and \fBw\fR (\f(CW\*(C`a*=w\*(C'\fR).
162 \&\fIBN_div_word()\fR divides \fBa\fR by \fBw\fR (\f(CW\*(C`a/=w\*(C'\fR) and returns the remainder.
164 \&\fIBN_mod_word()\fR returns the remainder of \fBa\fR divided by \fBw\fR (\f(CW\*(C`a%w\*(C'\fR).
166 For \fIBN_div_word()\fR and \fIBN_mod_word()\fR, \fBw\fR must not be 0.
168 .IX Header "RETURN VALUES"
169 \&\fIBN_add_word()\fR, \fIBN_sub_word()\fR and \fIBN_mul_word()\fR return 1 for success, 0
170 on error. The error codes can be obtained by \fIERR_get_error\fR\|(3).
172 \&\fIBN_mod_word()\fR and \fIBN_div_word()\fR return \fBa\fR%\fBw\fR on success and
173 \&\fB(\s-1BN_ULONG\s0)\-1\fR if an error occurred.
175 .IX Header "SEE ALSO"
176 \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3)
179 \&\fIBN_add_word()\fR and \fIBN_mod_word()\fR are available in all versions of
180 SSLeay and OpenSSL. \fIBN_div_word()\fR was added in SSLeay 0.8, and
181 \&\fIBN_sub_word()\fR and \fIBN_mul_word()\fR in SSLeay 0.9.0.
183 Before 0.9.8a the return value for \fIBN_div_word()\fR and \fIBN_mod_word()\fR
184 in case of an error was 0.