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 ); BIGNUM *BN_value_one(
               void ); int BN_set_word(
               BIGNUM  *a,  unsigned  long  w  );  unsigned  long
       BN_get_word(
               BIGNUM *a );

DESCRIPTION    [Toc]    [Back]

       The BN_zero(), BN_one(), and BN_set_word() functions set a
       to the values 0, 1  and  w  respectively.   BN_zero()  and
       BN_one() are macros.

       The  BN_value_one()  function returns a BIGNUM constant of
       value 1. This constant is useful for  use  in  comparisons
       and assignment.

       The  BN_get_word() function returns a, if it can be represented
 as an unsigned long.

RETURN VALUES    [Toc]    [Back]

       The  BN_get_word()  function  returns  the  value  a,  and
       0xffffffffL  if  a  cannot  be  represented as an unsigned
       long.

       The  BN_zero(),  BN_one(),  and  BN_set_word()   functions
       return 1 on success, 0 otherwise. The BN_value_one() function
 returns the constant.

RESTRICTIONS    [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.

HISTORY    [Toc]    [Back]

       The BN_zero(), BN_one(), and BN_set_word()  functions  are
       available  in  all  versions  of  SSLeay  and OpenSSL. The
       BN_value_one() and BN_get_word() functions were  added  in
       SSLeay 0.8.

SEE ALSO    [Toc]    [Back]

       Functions: bn(3), BN_bn2bin(3)



                                                       BN_zero(3)