1*2175Sjp161948=pod 2*2175Sjp161948 3*2175Sjp161948=head1 NAME 4*2175Sjp161948 5*2175Sjp161948BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic 6*2175Sjp161948functions on BIGNUMs with integers 7*2175Sjp161948 8*2175Sjp161948=head1 SYNOPSIS 9*2175Sjp161948 10*2175Sjp161948 #include <openssl/bn.h> 11*2175Sjp161948 12*2175Sjp161948 int BN_add_word(BIGNUM *a, BN_ULONG w); 13*2175Sjp161948 14*2175Sjp161948 int BN_sub_word(BIGNUM *a, BN_ULONG w); 15*2175Sjp161948 16*2175Sjp161948 int BN_mul_word(BIGNUM *a, BN_ULONG w); 17*2175Sjp161948 18*2175Sjp161948 BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w); 19*2175Sjp161948 20*2175Sjp161948 BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w); 21*2175Sjp161948 22*2175Sjp161948=head1 DESCRIPTION 23*2175Sjp161948 24*2175Sjp161948These functions perform arithmetic operations on BIGNUMs with unsigned 25*2175Sjp161948integers. They are much more efficient than the normal BIGNUM 26*2175Sjp161948arithmetic operations. 27*2175Sjp161948 28*2175Sjp161948BN_add_word() adds B<w> to B<a> (C<a+=w>). 29*2175Sjp161948 30*2175Sjp161948BN_sub_word() subtracts B<w> from B<a> (C<a-=w>). 31*2175Sjp161948 32*2175Sjp161948BN_mul_word() multiplies B<a> and B<w> (C<a*=w>). 33*2175Sjp161948 34*2175Sjp161948BN_div_word() divides B<a> by B<w> (C<a/=w>) and returns the remainder. 35*2175Sjp161948 36*2175Sjp161948BN_mod_word() returns the remainder of B<a> divided by B<w> (C<a%w>). 37*2175Sjp161948 38*2175Sjp161948For BN_div_word() and BN_mod_word(), B<w> must not be 0. 39*2175Sjp161948 40*2175Sjp161948=head1 RETURN VALUES 41*2175Sjp161948 42*2175Sjp161948BN_add_word(), BN_sub_word() and BN_mul_word() return 1 for success, 0 43*2175Sjp161948on error. The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. 44*2175Sjp161948 45*2175Sjp161948BN_mod_word() and BN_div_word() return B<a>%B<w> on success and 46*2175Sjp161948B<(BN_ULONG)-1> if an error occurred. 47*2175Sjp161948 48*2175Sjp161948=head1 SEE ALSO 49*2175Sjp161948 50*2175Sjp161948L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)> 51*2175Sjp161948 52*2175Sjp161948=head1 HISTORY 53*2175Sjp161948 54*2175Sjp161948BN_add_word() and BN_mod_word() are available in all versions of 55*2175Sjp161948SSLeay and OpenSSL. BN_div_word() was added in SSLeay 0.8, and 56*2175Sjp161948BN_sub_word() and BN_mul_word() in SSLeay 0.9.0. 57*2175Sjp161948 58*2175Sjp161948Before 0.9.8a the return value for BN_div_word() and BN_mod_word() 59*2175Sjp161948in case of an error was 0. 60*2175Sjp161948 61*2175Sjp161948=cut 62