ARC4 Encryption (ARCFOUR)

ARC4 (ARCFOUR) encryption. The Chilkat encryption component supports the ARC4 streaming encryption algorithm.

 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;
}

#  Set the encryption algorithm = "arc4"
$crypt->put_CryptAlgorithm("arc4");

#  KeyLength may range from 1 byte to 256 bytes.
#  (i.e. 8 bits to 2048 bits)
#  ARC4 key sizes are typically in the range of
#  40 to 128 bits.
#  The KeyLength property is specified in bits:
$crypt->put_KeyLength(128);

#  Note: The PaddingScheme and CipherMode properties
#  do not apply w/ ARC4.  ARC4 does not encrypt in blocks --
#  it is a streaming encryption algorithm. The number of output bytes
#  is exactly equal to the number of input bytes.

#  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");

#  Note: ARC4 does not utilize initialization vectors.  IV's only
#  apply to block encryption algorithms.

#  The secret key must equal the size of the key.
#  For 128-bit encryption, the binary secret key is 16 bytes.
$keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
$crypt->SetEncodedKey($keyHex,"hex");

#  Encrypt a string...
#  The output length is exactly equal to the input.  In this
#  example, the input string is 44 chars (ANSI bytes) so the
#  output is 44 bytes -- and when hex encoded results in an
#  88-char string (2 chars per byte for the hex encoding).
$encStr = $crypt->encryptStringENC("The quick brown fox jumps over the lazy dog.");
print $encStr . "\n";

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