56-bit DES Encryption, ECB, CBC modes

56-bit DES encryption. The Chilkat encryption component supports DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes.

 Chilkat Perl Module Downloads for Windows, Linux, and MAC OS X

use chilkat();

$crypt = new chilkat::CkCrypt2();

$success = $crypt->UnlockComponent("Anything for 30-day trial");
if ($success != 1) {
    print "Crypt component unlock failed" . "\n";
    exit;
}

#  Specify DES for the encryption algorithm:
$crypt->put_CryptAlgorithm("des");

#  CipherMode may be "ecb" or "cbc"
$crypt->put_CipherMode("cbc");

#  KeyLength must be 64.  DES is technically 56-bits;
#  the most-significant bit of each key byte is a parity bit,
#  so we must indicate a KeyLength of 64, which includes
#  the parity bits.
$crypt->put_KeyLength(64);

#  The padding scheme determines the contents of the bytes
#  that are added to pad the result to a multiple of the
#  encryption algorithm's block size.  DES has a block
#  size of 8 bytes, so encrypted output is always
#  a multiple of 8.
$crypt->put_PaddingScheme(0);

#  EncodingMode specifies the encoding of the output for
#  encryption, and the input for decryption.
#  It may be "hex", "url", "base64", or "quoted-printable".
$crypt->put_EncodingMode("hex");

#  An initialization vector is required if using CBC or CFB modes.
#  ECB mode does not use an IV.
#  The length of the IV is equal to the algorithm's block size.
#  It is NOT equal to the length of the key.
$ivHex = "0001020304050607";
$crypt->SetEncodedIV($ivHex,"hex");

#  The secret key must equal the size of the key.  For
#  DES, the key must be 8 bytes (i.e. 64-bits).
$keyHex = "0001020304050607";
$crypt->SetEncodedKey($keyHex,"hex");

#  Encrypt a string...
#  The input string is 44 ANSI characters (i.e. 44 bytes), so
#  the output should be 48 bytes (a multiple of 8).
#  Because the output is a hex string, it should
#  be 96 characters long (2 chars per byte).
$encStr = $crypt->encryptStringENC("The quick brown fox jumps over the lazy dog.");
print $encStr . "\n";

#  Now decrypt:
$decStr = $crypt->decryptStringENC($encStr);
print $decStr . "\n";