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ARC4 Encryption (ARCFOUR)

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

;  This example assumes the Chilkat API to have been previously unlocked.
;  See Global Unlock Sample for sample code.

$oCrypt = ObjCreate("Chilkat.Crypt2")

;  Set the encryption algorithm = "arc4"	
$oCrypt.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:
$oCrypt.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".
$oCrypt.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.
Local $sKeyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
$oCrypt.SetEncodedKey $sKeyHex,"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).
Local $sEncStr = $oCrypt.EncryptStringENC("The quick brown fox jumps over the lazy dog.")
ConsoleWrite($sEncStr & @CRLF)

;  Now decrypt:
Local $sDecStr = $oCrypt.DecryptStringENC($sEncStr)
ConsoleWrite($sDecStr & @CRLF)