1NAME 2 Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption 3 module 4 5SYNOPSIS 6 use Crypt::Rijndael; 7 8 # keysize() is 32, but 24 and 16 are also possible 9 # blocksize() is 16 10 11 $cipher = Crypt::Rijndael->new( "a" x 32, Crypt::Rijndael::MODE_CBC() ); 12 13 $cipher->set_iv($iv); 14 $crypted = $cipher->encrypt($plaintext); 15 # - OR - 16 $plaintext = $cipher->decrypt($crypted); 17 18DESCRIPTION 19 This module implements the Rijndael cipher, which has just been 20 selected as the Advanced Encryption Standard. 21 22 keysize 23 Returns the keysize, which is 32 (bytes). The Rijndael 24 cipher actually supports keylengths of 16, 24 or 32 bytes, 25 but there is no way to communicate this to `Crypt::CBC'. 26 27 blocksize 28 The blocksize for Rijndael is 16 bytes (128 bits), although 29 the algorithm actually supports any blocksize that is any 30 multiple of our bytes. 128 bits, is however, the AES- 31 specified block size, so this is all we support. 32 33 $cipher = Crypt::Rijndael->new( $key [, $mode] ) 34 Create a new `Crypt::Rijndael' cipher object with the given 35 key (which must be 128, 192 or 256 bits long). The 36 additional `$mode' argument is the encryption mode, either 37 `MODE_ECB' (electronic codebook mode, the default), 38 `MODE_CBC' (cipher block chaining, the same that 39 `Crypt::CBC' does), `MODE_CFB' (128-bit cipher feedback), 40 `MODE_OFB' (128-bit output feedback), or `MODE_CTR' (counter 41 mode). 42 43 ECB mode is very insecure (read a book on cryptography if 44 you dont know why!), so you should probably use CBC mode. 45 46 $cipher->set_iv($iv) 47 This allows you to change the initial value vector used by 48 the chaining modes. It is not relevant for ECB mode. 49 50 $cipher->encrypt($data) 51 Encrypt data. The size of `$data' must be a multiple of 52 `blocksize' (16 bytes), otherwise this function will croak. 53 Apart from that, it can be of (almost) any length. 54 55 $cipher->decrypt($data) 56 Decrypts `$data'. 57 58 Encryption modes 59 60 Use these constants to select the cipher type: 61 62 MODE_CBC - Cipher Block Chaining 63 MODE_CFB - Cipher feedback 64 MODE_CTR - Counter mode 65 MODE_ECB - Electronic cookbook mode 66 MODE_OFB - Output feedback 67 MODE_PCBC - ignore this one for now :) 68SEE ALSO 69 the Crypt::CBC manpage, http://www.csrc.nist.gov/encryption/aes/ 70 71BUGS 72 Should EXPORT or EXPORT_OK the MODE constants. 73 74AUTHOR 75 Currently maintained by brian d foy, `< <bdfoy@cpan.org' >>. 76 77 Original code by Rafael R. Sevilla. 78 79 The Rijndael Algorithm was developed by Vincent Rijmen and Joan 80 Daemen, and has been selected as the US Government's Advanced 81 Encryption Standard. 82 83SOURCE 84 This code is in Github: 85 86 git://github.com/briandfoy/crypt-rijndael.git 87 88 =head1 LICENSE 89 90 This software is licensed under the Lesser GNU Public License. 91 See the included COPYING file for details. 92 93