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BN_zero(3)                          OpenSSL                         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);
        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.

1.0.2k                            2017-01-26                        BN_zero(3)