VBScript

AES CFB Mode Encryption

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Demonstrates how to encrypt using AES CFB (Cipher Feedback) mode. VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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

set crypt = CreateObject("Chilkat.Crypt2")

crypt.CryptAlgorithm = "aes"
crypt.CipherMode = "cfb"
crypt.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.
crypt.EncodingMode = "hex"

ivHex = "000102030405060708090A0B0C0D0E0F"
crypt.SetEncodedIV ivHex,"hex"

' The secret key must equal the size of the key.  For
' 256-bit encryption, the binary secret key is 32 bytes.
keyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
crypt.SetEncodedKey keyHex,"hex"

' Encrypt a string...
encStr = crypt.EncryptStringENC("Good night, good night! parting is such sweet sorrow, That I shall say good night till it be morrow. --  William Shakespeare")
outFile.WriteLine(encStr)

set decrypt = CreateObject("Chilkat.Crypt2")

decrypt.CryptAlgorithm = "aes"
decrypt.CipherMode = "cfb"
decrypt.KeyLength = 256
decrypt.EncodingMode = "hex"
decrypt.SetEncodedIV ivHex,"hex"
decrypt.SetEncodedKey keyHex,"hex"

' Now decrypt:
decStr = decrypt.DecryptStringENC(encStr)
outFile.WriteLine(decStr)

outFile.Close