BN_zero(3)

     BN_zero(3)             0.9.6h (2000-09-14)             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);

           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.

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