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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

LIBRARY
       libcrypto, -lcrypto

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 rep-
       resented 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
       openssl_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.



3rd Berkeley Distribution           0.9.7d                          BN_zero(3)