159191Skris=pod 259191Skris 359191Skris=head1 NAME 459191Skris 559191SkrisBN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic 659191Skrisfunctions on BIGNUMs with integers 759191Skris 859191Skris=head1 SYNOPSIS 959191Skris 1059191Skris #include <openssl/bn.h> 1159191Skris 1259191Skris int BN_add_word(BIGNUM *a, BN_ULONG w); 1359191Skris 1459191Skris int BN_sub_word(BIGNUM *a, BN_ULONG w); 1559191Skris 1659191Skris int BN_mul_word(BIGNUM *a, BN_ULONG w); 1759191Skris 1859191Skris BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w); 1959191Skris 2059191Skris BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w); 2159191Skris 2259191Skris=head1 DESCRIPTION 2359191Skris 2459191SkrisThese functions perform arithmetic operations on BIGNUMs with unsigned 2559191Skrisintegers. They are much more efficient than the normal BIGNUM 2659191Skrisarithmetic operations. 2759191Skris 2859191SkrisBN_add_word() adds B<w> to B<a> (C<a+=w>). 2959191Skris 3059191SkrisBN_sub_word() subtracts B<w> from B<a> (C<a-=w>). 3159191Skris 32160814SsimonBN_mul_word() multiplies B<a> and B<w> (C<a*=w>). 3359191Skris 3459191SkrisBN_div_word() divides B<a> by B<w> (C<a/=w>) and returns the remainder. 3559191Skris 36160814SsimonBN_mod_word() returns the remainder of B<a> divided by B<w> (C<a%w>). 3759191Skris 3859191SkrisFor BN_div_word() and BN_mod_word(), B<w> must not be 0. 3959191Skris 4059191Skris=head1 RETURN VALUES 4159191Skris 4259191SkrisBN_add_word(), BN_sub_word() and BN_mul_word() return 1 for success, 0 4359191Skrison error. The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. 4459191Skris 45160814SsimonBN_mod_word() and BN_div_word() return B<a>%B<w> on success and 46160814SsimonB<(BN_ULONG)-1> if an error occurred. 4759191Skris 4859191Skris=head1 SEE ALSO 4959191Skris 50109998SmarkmL<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)> 5159191Skris 5259191Skris=head1 HISTORY 5359191Skris 5459191SkrisBN_add_word() and BN_mod_word() are available in all versions of 5559191SkrisSSLeay and OpenSSL. BN_div_word() was added in SSLeay 0.8, and 5659191SkrisBN_sub_word() and BN_mul_word() in SSLeay 0.9.0. 5759191Skris 58160814SsimonBefore 0.9.8a the return value for BN_div_word() and BN_mod_word() 59160814Ssimonin case of an error was 0. 60160814Ssimon 6159191Skris=cut 62