| =pod |
| |
| =head1 NAME |
| |
| BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment |
| operations |
| |
| =head1 SYNOPSIS |
| |
| #include <openssl/bn.h> |
| |
| int BN_zero(BIGNUM *a); |
| int BN_one(BIGNUM *a); |
| |
| const BIGNUM *BN_value_one(void); |
| |
| int BN_set_word(BIGNUM *a, unsigned long w); |
| unsigned long BN_get_word(BIGNUM *a); |
| |
| =head1 DESCRIPTION |
| |
| BN_zero(), BN_one() and BN_set_word() set B<a> to the values 0, 1 and |
| B<w> respectively. BN_zero() and BN_one() are macros. |
| |
| BN_value_one() returns a B<BIGNUM> constant of value 1. This constant |
| is useful for use in comparisons and assignment. |
| |
| BN_get_word() returns B<a>, if it can be represented as an unsigned |
| long. |
| |
| =head1 RETURN VALUES |
| |
| BN_get_word() returns the value B<a>, and 0xffffffffL if B<a> cannot |
| be represented as an unsigned long. |
| |
| BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise. |
| BN_value_one() returns the constant. |
| |
| =head1 BUGS |
| |
| Someone might change the constant. |
| |
| If a B<BIGNUM> is equal to 0xffffffffL it can be represented as an |
| unsigned long but this value is also returned on error. |
| |
| =head1 SEE ALSO |
| |
| L<bn(3)|bn(3)>, L<BN_bn2bin(3)|BN_bn2bin(3)> |
| |
| =head1 HISTORY |
| |
| BN_zero(), BN_one() and BN_set_word() are available in all versions of |
| SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in |
| SSLeay 0.8. |
| |
| BN_value_one() was changed to return a true const BIGNUM * in OpenSSL |
| 0.9.7. |
| |
| =cut |
