1=pod 2 3=head1 NAME 4 5BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment 6operations 7 8=head1 SYNOPSIS 9 10 #include <openssl/bn.h> 11 12 int BN_zero(BIGNUM *a); 13 int BN_one(BIGNUM *a); 14 15 const BIGNUM *BN_value_one(void); 16 17 int BN_set_word(BIGNUM *a, unsigned long w); 18 unsigned long BN_get_word(BIGNUM *a); 19 20=head1 DESCRIPTION 21 22BN_zero(), BN_one() and BN_set_word() set B<a> to the values 0, 1 and 23B<w> respectively. BN_zero() and BN_one() are macros. 24 25BN_value_one() returns a B<BIGNUM> constant of value 1. This constant 26is useful for use in comparisons and assignment. 27 28BN_get_word() returns B<a>, if it can be represented as an unsigned 29long. 30 31=head1 RETURN VALUES 32 33BN_get_word() returns the value B<a>, and 0xffffffffL if B<a> cannot 34be represented as an unsigned long. 35 36BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise. 37BN_value_one() returns the constant. 38 39=head1 BUGS 40 41Someone might change the constant. 42 43If a B<BIGNUM> is equal to 0xffffffffL it can be represented as an 44unsigned long but this value is also returned on error. 45 46=head1 SEE ALSO 47 48L<bn(3)|bn(3)>, L<BN_bn2bin(3)|BN_bn2bin(3)> 49 50=head1 HISTORY 51 52BN_zero(), BN_one() and BN_set_word() are available in all versions of 53SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in 54SSLeay 0.8. 55 56BN_value_one() was changed to return a true const BIGNUM * in OpenSSL 570.9.7. 58 59=cut 60