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AES OFB Output Feedback Mode Encryption

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Demonstrates how to encrypt using AES OFB (Output Feedback) mode. AutoIt

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

$oCrypt = ObjCreate("Chilkat.Crypt2")

$oCrypt.CryptAlgorithm = "aes"
; Set the cipher mode to Output Feedback
$oCrypt.CipherMode = "ofb"
$oCrypt.KeyLength = 256

; EncodingMode specifies the encoding of the output for
; encryption, and the input for decryption.
; It may be "hex", "url", "base64", "quoted-printable", or many other choices.
$oCrypt.EncodingMode = "hex"

Local $sIvHex = "000102030405060708090A0B0C0D0E0F"
$oCrypt.SetEncodedIV $sIvHex,"hex"

; The secret key must equal the size of the key.  For
; 256-bit encryption, the binary secret key is 32 bytes.
Local $sKeyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
$oCrypt.SetEncodedKey $sKeyHex,"hex"

; Encrypt a string...
Local $sEncStr = $oCrypt.EncryptStringENC("Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth. -- John Stuart Mill")
ConsoleWrite($sEncStr & @CRLF)

$oDecrypt = ObjCreate("Chilkat.Crypt2")
$oDecrypt.CryptAlgorithm = "aes"
$oDecrypt.CipherMode = "ofb"
$oDecrypt.KeyLength = 256
$oDecrypt.EncodingMode = "hex"
$oDecrypt.SetEncodedIV $sIvHex,"hex"
$oDecrypt.SetEncodedKey $sKeyHex,"hex"

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