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BN_ZERO(3)		 BSD Library Functions Manual		    BN_ZERO(3)

NAME
     BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word — BIGNUM assign‐
     ment 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, or 0xffffffffL if a cannot be repre‐
     sented as an unsigned long.

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

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.

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.

BSD				April 23, 2024				   BSD

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