(Excel) PBKDF2 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

Download Excel Class Modules Chilkat Excel Class Modules

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

Dim crypt As Chilkat.Crypt2
Set crypt = Chilkat.NewCrypt2

' http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf


pw = "password"

pwCharset = "ansi"
' Hash algorithms may be: sha1, md2, md5, etc.

hashAlg = "sha1"
' The salt should be 8 bytes:

saltHex = "78578E5A5D63CB06"

iterationCount = 2048
' Derive a 192-bit key from the password.

outputBitLen = 192

' 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(pw,pwCharset,hashAlg,saltHex,iterationCount,outputBitLen,enc)

Debug.Print hexKey

' The output should have this value:
' BFDE6BE94DF7E11DD409BCE20A0255EC327CB936FFE9364