=pod =head1 NAME BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment operations =head1 SYNOPSIS #include void 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_one() and BN_set_word() return 1 on success, 0 otherwise. BN_value_one() returns the constant. BN_zero() never fails and returns no value. =head1 BUGS 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 =head1 HISTORY In OpenSSL 0.9.8, BN_zero() was changed to not return a value; previous versions returned an int. =head1 COPYRIGHT Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L. =cut