1Crypt::Mode::ECB(3)   User Contributed Perl Documentation  Crypt::Mode::ECB(3)
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NAME

6       Crypt::Mode::ECB - Block cipher mode ECB [Electronic codebook]
7

SYNOPSIS

9          use Crypt::Mode::ECB;
10          my $m = Crypt::Mode::ECB->new('AES');
11
12          #(en|de)crypt at once
13          my $ciphertext = $m->encrypt($plaintext, $key);
14          my $plaintext = $m->decrypt($ciphertext, $key);
15
16          #encrypt more chunks
17          $m->start_encrypt($key);
18          my $ciphertext = $m->add('some data');
19          $ciphertext .= $m->add('more data');
20          $ciphertext .= $m->finish;
21
22          #decrypt more chunks
23          $m->start_decrypt($key);
24          my $plaintext = $m->add($some_ciphertext);
25          $plaintext .= $m->add($more_ciphertext);
26          $plaintext .= $m->finish;
27

DESCRIPTION

29       This module implements ECB cipher mode. NOTE: it works only with
30       ciphers from CryptX (Crypt::Cipher::NNNN).  BEWARE: ECB is inherently
31       insecure, if you are not sure go for Crypt::Mode::CBC!
32

METHODS

34   new
35        my $m = Crypt::Mode::ECB->new('AES');
36        #or
37        my $m = Crypt::Mode::ECB->new('AES', $padding);
38        #or
39        my $m = Crypt::Mode::ECB->new('AES', $padding, $cipher_rounds);
40
41        # $padding .... 0 no padding (plaintext size has to be myltiple of block length)
42        #               1 PKCS5 padding, Crypt::CBC's "standard" - DEFAULT
43        #               2 Crypt::CBC's "oneandzeroes"
44        # $cipher_rounds ... optional num of rounds for given cipher
45
46   encrypt
47          my $ciphertext = $m->encrypt($plaintext, $key);
48
49   decrypt
50          my $plaintext = $m->decrypt($ciphertext, $key);
51
52   start_encrypt
53          $m->start_encrypt($key);
54
55   start_decrypt
56          $m->start_decrypt($key);
57
58   add
59          # in encrypt mode
60          my $plaintext = $m->add($ciphertext);
61
62          # in decrypt mode
63          my $ciphertext = $m->add($plaintext);
64
65   finish
66          #encrypt more chunks
67          $m->start_encrypt($key);
68          my $ciphertext = '';
69          $ciphertext .= $m->add('some data');
70          $ciphertext .= $m->add('more data');
71          $ciphertext .= $m->finish;
72
73          #decrypt more chunks
74          $m->start_decrypt($key);
75          my $plaintext = '';
76          $plaintext .= $m->add($some_ciphertext);
77          $plaintext .= $m->add($more_ciphertext);
78          $plaintext .= $m->finish;
79

SEE ALSO

81       ·   CryptX, Crypt::Cipher
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83       ·   Crypt::Cipher::AES, Crypt::Cipher::Blowfish, ...
84
85       ·   <https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_codebook_.28ECB.29>
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89perl v5.32.1                      2021-03-30               Crypt::Mode::ECB(3)
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