VBScript

PBKDF2 Key Derivation

Demonstrates AES secret key derivation from a password using PBDKF2. 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 assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

set crypt = CreateObject("Chilkat.Crypt2")

password = "correcthorsebatterystaple"

' Derive from the utf-8 byte representation of the password.
charset = "utf-8"

hashAlg = "sha256"

crypt.EncodingMode = "hex"
saltHex = crypt.GenRandomBytesENC(16)

iterationCount = 310000

' Derive a 256-bit key from the password.
outputBitLen = 256

' The derived key is returned as a hex or base64 encoded string.
' (Note: The salt argument must be a string that also uses
' the same encoding.)
enc = "hex"

hexKey = crypt.Pbkdf2(password,charset,hashAlg,saltHex,iterationCount,outputBitLen,enc)

outFile.WriteLine(hexKey)

' Sample output:
' 597734C894FF89CFD3B93D925462C24E97724BCB118F6FC919007F5ABC27E768

outFile.Close