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.