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

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

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

26       An object of this type encapsulates a keyed instance of the Blowfish
27       block cipher, ready to encrypt and decrypt.
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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).
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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.
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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.
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45       Crypt::Eksblowfish::Blowfish->keysize
46           Returns 0, indicating that the key size is variable.  This
47           situation is handled specially by "Crypt::CBC".
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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.
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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.
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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.
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68       $cipher->encrypt(PLAINTEXT)
69           PLAINTEXT must be exactly eight octets.  The block is encrypted,
70           and the ciphertext is returned.
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72       $cipher->decrypt(CIPHERTEXT)
73           CIPHERTEXT must be exactly eight octets.  The block is decrypted,
74           and the plaintext is returned.
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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.
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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.
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SEE ALSO

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

93       Eksblowfish guts originally by Solar Designer (solar at openwall.com).
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95       Modifications and Perl interface by Andrew Main (Zefram)
96       <zefram@fysh.org>.
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99       Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Andrew Main (Zefram)
100       <zefram@fysh.org>
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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/>.
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LICENSE

107       This module is free software; you can redistribute it and/or modify it
108       under the same terms as Perl itself.
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112perl v5.30.0                      2019-07-26   Crypt::Eksblowfish::Blowfish(3)
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