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0.9.7e/doc/crypto
Page 1 (printed 10/20/05)
BN_zero(3) 18/Jul/2002 (0.9.7e) BN_zero(3)
NAME
BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word -
BIGNUM assignment operations
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);
DESCRIPTION
BN_zero(), BN_one() and BN_set_word() set a to the values 0,
1 and w respectively. BN_zero() and BN_one() are macros.
BN_value_one() returns a BIGNUM constant of value 1. This
constant is useful for use in comparisons and assignment.
BN_get_word() returns a, if it can be represented as an
unsigned long.
RETURN VALUES
BN_get_word() returns the value a, and 0xffffffffL if 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.
BUGS
Someone might change the constant.
If a BIGNUM is equal to 0xffffffffL it can be represented as
an unsigned long but this value is also returned on error.
SEE ALSO
bn(3), BN_bn2bin(3)
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.
Page 1 (printed 10/20/05)
BN_zero(3) 18/Jul/2002 (0.9.7e) BN_zero(3)
Page 2 (printed 10/20/05)
