1BN_zero(3)                          OpenSSL                         BN_zero(3)
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NAME

6       BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM
7       assignment operations
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SYNOPSIS

10        #include <openssl/bn.h>
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12        int BN_zero(BIGNUM *a);
13        int BN_one(BIGNUM *a);
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15        const BIGNUM *BN_value_one(void);
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17        int BN_set_word(BIGNUM *a, unsigned long w);
18        unsigned long BN_get_word(BIGNUM *a);
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DESCRIPTION

21       BN_zero(), BN_one() and BN_set_word() set a to the values 0, 1 and w
22       respectively.  BN_zero() and BN_one() are macros.
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24       BN_value_one() returns a BIGNUM constant of value 1. This constant is
25       useful for use in comparisons and assignment.
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27       BN_get_word() returns a, if it can be represented as an unsigned long.
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RETURN VALUES

30       BN_get_word() returns the value a, and 0xffffffffL if a cannot be
31       represented as an unsigned long.
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33       BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise.
34       BN_value_one() returns the constant.
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BUGS

37       Someone might change the constant.
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39       If a BIGNUM is equal to 0xffffffffL it can be represented as an
40       unsigned long but this value is also returned on error.
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SEE ALSO

43       bn(3), BN_bn2bin(3)
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HISTORY

46       BN_zero(), BN_one() and BN_set_word() are available in all versions of
47       SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in
48       SSLeay 0.8.
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50       BN_value_one() was changed to return a true const BIGNUM * in OpenSSL
51       0.9.7.
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551.0.0e                            2002-07-18                        BN_zero(3)
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