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BN_zero(3)				     OpenSSL				       BN_zero(3)

       BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment operations

	#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);

       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.

       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.

       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.

       bn(3), BN_bn2bin(3)

       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.

0.9.7a					    2002-07-18				       BN_zero(3)
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