aboutsummaryrefslogtreecommitdiff
path: root/openssl/doc/crypto/BN_cmp.pod
blob: 23e9ed0b4f95de9e68b122c36a9f45e5daa6ad89 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
=pod

=head1 NAME

BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd - BIGNUM comparison and test functions

=head1 SYNOPSIS

 #include <openssl/bn.h>

 int BN_cmp(BIGNUM *a, BIGNUM *b);
 int BN_ucmp(BIGNUM *a, BIGNUM *b);

 int BN_is_zero(BIGNUM *a);
 int BN_is_one(BIGNUM *a);
 int BN_is_word(BIGNUM *a, BN_ULONG w);
 int BN_is_odd(BIGNUM *a);

=head1 DESCRIPTION

BN_cmp() compares the numbers B<a> and B<b>. BN_ucmp() compares their
absolute values.

BN_is_zero(), BN_is_one() and BN_is_word() test if B<a> equals 0, 1,
or B<w> respectively. BN_is_odd() tests if a is odd.

BN_is_zero(), BN_is_one(), BN_is_word() and BN_is_odd() are macros.

=head1 RETURN VALUES

BN_cmp() returns -1 if B<a> E<lt> B<b>, 0 if B<a> == B<b> and 1 if
B<a> E<gt> B<b>. BN_ucmp() is the same using the absolute values
of B<a> and B<b>.

BN_is_zero(), BN_is_one() BN_is_word() and BN_is_odd() return 1 if
the condition is true, 0 otherwise.

=head1 SEE ALSO

L<bn(3)|bn(3)>

=head1 HISTORY

BN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one() and BN_is_word() are
available in all versions of SSLeay and OpenSSL.
BN_is_odd() was added in SSLeay 0.8.

=cut