1Crypt::Eksblowfish::BloUwsfeirshC(o3n)tributed Perl DocuCmreynptta:t:iEoknsblowfish::Blowfish(3)
2
3
4

NAME

6       Crypt::Eksblowfish::Blowfish - Blowfish block cipher via Eksblowfish
7       engine
8

SYNOPSIS

10               use Crypt::Eksblowfish::Blowfish;
11
12               $block_size = Crypt::Eksblowfish::Blowfish->blocksize;
13               $key_size = Crypt::Eksblowfish::Blowfish->keysize;
14
15               $cipher = Crypt::Eksblowfish::Blowfish->new($key);
16
17               $block_size = $cipher->blocksize;
18               $ciphertext = $cipher->encrypt($plaintext);
19               $plaintext = $cipher->decrypt($ciphertext);
20
21               $p_array = $cipher->p_array;
22               $s_boxes = $cipher->s_boxes;
23               if($cipher->is_weak) { ...
24

DESCRIPTION

26       An object of this type encapsulates a keyed instance of the Blowfish
27       block cipher, ready to encrypt and decrypt.
28
29       Blowfish is a symmetric cipher algorithm designed by Bruce Schneier in
30       1993.  It operates on 64-bit blocks, and takes a variable-length key
31       from 32 bits (4 octets) to 448 bits (56 octets) in increments of 8 bits
32       (1 octet).
33
34       This implementation of Blowfish uses an encryption engine that was
35       originally implemented in order to support Eksblowfish, which is a
36       variant of Blowfish modified to make keying particularly expensive.
37       See Crypt::Eksblowfish for that variant; this class implements the
38       original Blowfish.
39

CLASS METHODS

41       Crypt::Eksblowfish::Blowfish->blocksize
42           Returns 8, indicating the Blowfish block size of 8 octets.  This
43           method may be called on either the class or an instance.
44
45       Crypt::Eksblowfish::Blowfish->keysize
46           Returns 0, indicating that the key size is variable.  This
47           situation is handled specially by "Crypt::CBC".
48

CONSTRUCTOR

50       Crypt::Eksblowfish::Blowfish->new(KEY)
51           Performs key setup on a new instance of the Blowfish algorithm,
52           returning the keyed state.  The KEY may be any length from 4 octets
53           to 56 octets inclusive.
54
55           You may occasionally come across an alleged Blowfish key that is
56           outside this length range, and so is rejected by this constructor.
57           Blowfish can internally process a key of any octet length up to 72
58           octets, and some implementations don't enforce the official length
59           restrictions.  If it is necessary for compatibility, a key of out-
60           of-range length can be processed by
61           Crypt::Eksblowfish::Uklblowfish.
62

METHODS

64       $cipher->blocksize
65           Returns 8, indicating the Blowfish block size of 8 octets.  This
66           method may be called on either the class or an instance.
67
68       $cipher->encrypt(PLAINTEXT)
69           PLAINTEXT must be exactly eight octets.  The block is encrypted,
70           and the ciphertext is returned.
71
72       $cipher->decrypt(CIPHERTEXT)
73           CIPHERTEXT must be exactly eight octets.  The block is decrypted,
74           and the plaintext is returned.
75
76       $cipher->p_array
77       $cipher->s_boxes
78           These methods extract the subkeys from the keyed cipher.  This is
79           not required in ordinary operation.  See the superclass
80           Crypt::Eksblowfish::Subkeyed for details.
81
82       $cipher->is_weak
83           This method checks whether the cipher has been keyed with a weak
84           key.  It may be desired to avoid using weak keys.  See the
85           superclass Crypt::Eksblowfish::Subkeyed for details.
86

SEE ALSO

88       Crypt::Eksblowfish, Crypt::Eksblowfish::Subkeyed,
89       Crypt::Eksblowfish::Uklblowfish,
90       <http://www.schneier.com/blowfish.html>
91

AUTHOR

93       Eksblowfish guts originally by Solar Designer (solar at openwall.com).
94
95       Modifications and Perl interface by Andrew Main (Zefram)
96       <zefram@fysh.org>.
97
99       Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Andrew Main (Zefram)
100       <zefram@fysh.org>
101
102       The original Eksblowfish code (in the form of crypt()) from which this
103       module is derived is in the public domain.  It may be found at
104       <http://www.openwall.com/crypt/>.
105

LICENSE

107       This module is free software; you can redistribute it and/or modify it
108       under the same terms as Perl itself.
109
110
111
112perl v5.36.0                      2022-07-22   Crypt::Eksblowfish::Blowfish(3)
Impressum