VBScript AES Encrypt with Initialization Vector

Download Chilkat Crypt ActiveX

This VBscript show how to do AES encryption using an initialization vector of 16 bytes. (The IV must always be 16 bytes). It also shows how to set the binary secret key directly from a byte array.

' VBscript to AES encrypt strings
set crypt = CreateObject("Chilkat.Crypt2")

' Any value passed to UnlockComponent begins the 30-day trial.
unlocked = crypt.UnlockComponent("30-day trial")
if unlocked then

	' Note: AES encryption pads to a multiple of 16 bytes.
	crypt.CryptAlgorithm = "aes"
	' Cipher Block Chaining is the default and most common mode for AES.
	' You can also select "ecb" for Electronic Cookbook.
	crypt.CipherMode = "cbc"
	' The key length can be 128, 192, or 256
	crypt.KeyLength = 128
	
	Dim pk(15)
	Dim iv(15) 
	For i = 0 to 15 
	        pk(i) = CByte(i*15) 
	        iv(i) = CByte((15-i) * 13) 
	Next 

	crypt.SecretKey = pk 
	crypt.IV = iv 
	
	' Encrypt a string. Return the encrypted data as a URL-encoded string.
	crypt.EncodingMode = "url"
	MsgBox crypt.EncryptStringENC("123")
		
	' Encrypt a string. Return the encrypted data as a base64-encoded string.
	crypt.EncodingMode = "base64"
	MsgBox crypt.EncryptStringENC("123")
		
	' Encrypt a string. Return the encrypted data as a hex-encoded string.
	crypt.EncodingMode = "hex"
	MsgBox crypt.EncryptStringENC("123")
			
else
	MsgBox "Crypt object is not unlocked!"
end if