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131 .IX Title "BN_add_word 3"
132 .TH BN_add_word 3 "2004-12-18" "0.9.7e" "OpenSSL"
134 BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word \- arithmetic
135 functions on BIGNUMs with integers
137 .IX Header "SYNOPSIS"
139 \& #include <openssl/bn.h>
143 \& int BN_add_word(BIGNUM *a, BN_ULONG w);
147 \& int BN_sub_word(BIGNUM *a, BN_ULONG w);
151 \& int BN_mul_word(BIGNUM *a, BN_ULONG w);
155 \& BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
159 \& BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
162 .IX Header "DESCRIPTION"
163 These functions perform arithmetic operations on BIGNUMs with unsigned
164 integers. They are much more efficient than the normal \s-1BIGNUM\s0
165 arithmetic operations.
167 \&\fIBN_add_word()\fR adds \fBw\fR to \fBa\fR (\f(CW\*(C`a+=w\*(C'\fR).
169 \&\fIBN_sub_word()\fR subtracts \fBw\fR from \fBa\fR (\f(CW\*(C`a\-=w\*(C'\fR).
171 \&\fIBN_mul_word()\fR multiplies \fBa\fR and \fBw\fR (\f(CW\*(C`a*=b\*(C'\fR).
173 \&\fIBN_div_word()\fR divides \fBa\fR by \fBw\fR (\f(CW\*(C`a/=w\*(C'\fR) and returns the remainder.
175 \&\fIBN_mod_word()\fR returns the remainder of \fBa\fR divided by \fBw\fR (\f(CW\*(C`a%m\*(C'\fR).
177 For \fIBN_div_word()\fR and \fIBN_mod_word()\fR, \fBw\fR must not be 0.
179 .IX Header "RETURN VALUES"
180 \&\fIBN_add_word()\fR, \fIBN_sub_word()\fR and \fIBN_mul_word()\fR return 1 for success, 0
181 on error. The error codes can be obtained by \fIERR_get_error\fR\|(3).
183 \&\fIBN_mod_word()\fR and \fIBN_div_word()\fR return \fBa\fR%\fBw\fR.
185 .IX Header "SEE ALSO"
186 \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3)
189 \&\fIBN_add_word()\fR and \fIBN_mod_word()\fR are available in all versions of
190 SSLeay and OpenSSL. \fIBN_div_word()\fR was added in SSLeay 0.8, and
191 \&\fIBN_sub_word()\fR and \fIBN_mul_word()\fR in SSLeay 0.9.0.