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NAMECrypt::Rijndael - Crypt::CBC compliant Rijndael encryption module
use Crypt::Rijndael; # keysize() is 32, but 24 and 16 are also possible # blocksize() is 16 $cipher = Crypt::Rijndael->new( "a" x 32, Crypt::Rijndael::MODE_CBC() ); $cipher->set_iv($iv); $crypted = $cipher->encrypt($plaintext); # - OR - $plaintext = $cipher->decrypt($crypted);
DESCRIPTIONThis module implements the Rijndael cipher, which has just been selected as the Advanced Encryption Standard.
- Returns the keysize, which is 32 (bytes). The Rijndael cipher actually supports keylengths of 16, 24 or 32 bytes, but there is no way to communicate this to "Crypt::CBC".
- The blocksize for Rijndael is 16 bytes (128 bits), although the algorithm actually supports any blocksize that is any multiple of our bytes. 128 bits, is however, the AES-specified block size, so this is all we support.
- $cipher = Crypt::Rijndael->new( $key [, $mode] )
Create a new "Crypt::Rijndael" cipher object with the given key
(which must be 128, 192 or 256 bits long). The additional $mode
argument is the encryption mode, either "MODE_ECB" (electronic
codebook mode, the default), "MODE_CBC" (cipher block chaining, the
same that "Crypt::CBC" does), "MODE_CFB" (128-bit cipher feedback),
"MODE_OFB" (128-bit output feedback), or "MODE_CTR" (counter mode).
ECBmode is very insecure (read a book on cryptography if you don't know why!), so you should probably useCBCmode.
This allows you to change the initial value vector used by the
chaining modes. It is not relevant for ECBmode.
- Encrypt data. The size of $data must be a multiple of "blocksize" (16 bytes), otherwise this function will croak. Apart from that, it can be of (almost) any length.
- Decrypts $data.
Encryption modesUse these constants to select the cipher type:
- MODE_CBC- Cipher Block Chaining
- MODE_CFB- Cipher feedback
- MODE_CTR- Counter mode
- MODE_ECB- Electronic cookbook mode
- MODE_OFB- Output feedback
- MODE_PCBC- ignore this one for now :)
SEE ALSOCrypt::CBC, www.csrc.nist.gov/encryption/aes
AUTHORCurrently maintained by Leon Timmermans "firstname.lastname@example.org".
Previously maintained by brian d foy, "<email@example.com>".
Original code by Rafael R. Sevilla.
The Rijndael Algorithm was developed by Vincent Rijmen and Joan Daemen, and has been selected as the
USGovernment's Advanced Encryption Standard.
SOURCEThis code is in Github:
LICENSEThis software is licensed under the Lesser
GNUPublic License v3 (29 June 2007). See the included
COPYINGfile for details.