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=pod =head1 NAME BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment operations =head1 SYNOPSIS #include 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 to the values 0, 1 and B respectively. BN_zero() and BN_one() are macros. BN_value_one() returns a B constant of value 1. This constant is useful for use in comparisons and assignment. BN_get_word() returns B, if it can be represented as an unsigned long. =head1 RETURN VALUES BN_get_word() returns the value B, and 0xffffffffL if B 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 is equal to 0xffffffffL it can be represented as an unsigned long but this value is also returned on error. =head1 SEE ALSO L, L =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