Crypt::Rijndael(3pm)

1Rijndael(3)           User Contributed Perl Documentation          Rijndael(3)
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NAME

6       Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption module
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VERSION

9       Version 1.14
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SYNOPSIS

12        use Crypt::Rijndael;
13
14        # keysize() is 32, but 24 and 16 are also possible
15        # blocksize() is 16
16
17        $cipher = Crypt::Rijndael->new( "a" x 32, Crypt::Rijndael::MODE_CBC() );
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19        $cipher->set_iv($iv);
20        $crypted = $cipher->encrypt($plaintext);
21               # - OR -
22        $plaintext = $cipher->decrypt($crypted);
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DESCRIPTION

25       This module implements the Rijndael cipher, which has just been
26       selected as the Advanced Encryption Standard.
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28       keysize
29           Returns the keysize, which is 32 (bytes). The Rijndael cipher
30           actually supports keylengths of 16, 24 or 32 bytes, but there is no
31           way to communicate this to "Crypt::CBC".
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33       blocksize
34           The blocksize for Rijndael is 16 bytes (128 bits), although the
35           algorithm actually supports any blocksize that is any multiple of
36           our bytes.  128 bits, is however, the AES-specified block size, so
37           this is all we support.
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39       $cipher = Crypt::Rijndael->new( $key [, $mode] )
40           Create a new "Crypt::Rijndael" cipher object with the given key
41           (which must be 128, 192 or 256 bits long). The additional $mode
42           argument is the encryption mode, either "MODE_ECB" (electronic
43           codebook mode, the default), "MODE_CBC" (cipher block chaining, the
44           same that "Crypt::CBC" does), "MODE_CFB" (128-bit cipher feedback),
45           "MODE_OFB" (128-bit output feedback), or "MODE_CTR" (counter mode).
46
47           ECB mode is very insecure (read a book on cryptography if you don't
48           know why!), so you should probably use CBC mode.
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50       $cipher->set_iv($iv)
51           This allows you to change the initial value vector used by the
52           chaining modes.  It is not relevant for ECB mode.
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54       $cipher->encrypt($data)
55           Encrypt data. The size of $data must be a multiple of "blocksize"
56           (16 bytes), otherwise this function will croak. Apart from that, it
57           can be of (almost) any length.
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59       $cipher->decrypt($data)
60           Decrypts $data.
61
62   Encryption modes
63       Use these constants to select the cipher type:
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65       MODE_CBC - Cipher Block Chaining
66       MODE_CFB - Cipher feedback
67       MODE_CTR - Counter mode
68       MODE_ECB - Electronic cookbook mode
69       MODE_OFB - Output feedback
70       MODE_PCBC - ignore this one for now :)
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BUGS

76       Should EXPORT or EXPORT_OK the MODE constants.
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AUTHOR

79       Currently maintained by Leon Timmermans "leont@cpan.org".
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81       Previously maintained by brian d foy, "<bdfoy@cpan.org>".
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83       Original code by  Rafael R. Sevilla.
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85       The Rijndael Algorithm was developed by Vincent Rijmen and Joan Daemen,
86       and has been selected as the US Government's Advanced Encryption
87       Standard.
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SOURCE

90       This code is in Github:
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92               git://github.com/leont/crypt-rijndael.git
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LICENSE

95       This software is licensed under the Lesser GNU Public License v3 (29
96       June 2007). See the included COPYING file for details.
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100perl v5.32.1                      2021-01-27                       Rijndael(3)