NAME    [Toc]    [Back]

       BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word -
       BIGNUM assignment operations

SYNOPSIS    [Toc]    [Back]

        #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    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       bn(3), BN_bn2bin(3)

HISTORY    [Toc]    [Back]

       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.


OpenBSD 3.6                 2002-09-10                          1