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);
DESCRIPTIONBN_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 VALUESBN_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.
RestrictionsSomeone 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 ALSObn(3) ,
BN_bn2bin(3) HISTORYBN_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.
HP Open Source Security for OpenVMS Volume 2:... 
CRYPTO Application Programming Interface (API)... 
