1BN_zero(3)                          OpenSSL                         BN_zero(3)
2
3
4

NAME

6       BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM
7       assignment operations
8

SYNOPSIS

10        #include <openssl/bn.h>
11
12        int BN_zero(BIGNUM *a);
13        int BN_one(BIGNUM *a);
14
15        const BIGNUM *BN_value_one(void);
16
17        int BN_set_word(BIGNUM *a, BN_ULONG w);
18        BN_ULONG BN_get_word(BIGNUM *a);
19

DESCRIPTION

21       BN_ULONG is a macro that will be an unsigned integral type optimied for
22       the most efficient implementation on the local platform.
23
24       BN_zero(), BN_one() and BN_set_word() set a to the values 0, 1 and w
25       respectively.  BN_zero() and BN_one() are macros.
26
27       BN_value_one() returns a BIGNUM constant of value 1. This constant is
28       useful for use in comparisons and assignment.
29
30       BN_get_word() returns a, if it can be represented as a BN_ULONG.
31

RETURN VALUES

33       BN_get_word() returns the value a, or all-bits-set if a cannot be
34       represented as a BN_ULONG.
35
36       BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise.
37       BN_value_one() returns the constant.
38

BUGS

40       If a BIGNUM is equal to the value of all-bits-set, it will collide with
41       the error condition returned by BN_get_word() which uses that as an
42       error value.
43
44       BN_ULONG should probably be a typedef.
45

SEE ALSO

47       bn(3), BN_bn2bin(3)
48

HISTORY

50       BN_zero(), BN_one() and BN_set_word() are available in all versions of
51       SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in
52       SSLeay 0.8.
53
54       BN_value_one() was changed to return a true const BIGNUM * in OpenSSL
55       0.9.7.
56
57
58
591.0.2o                            2020-08-01                        BN_zero(3)
Impressum