(Visual Basic 6.0) PBKDF2 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2.

For more information, see https://www.chilkatsoft.com/key_derivation_pbkdf2.asp

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim crypt As New ChilkatCrypt2

Dim pw As String
pw = "password"

Dim pwCharset As String
pwCharset = "utf-8"

' Such as sha256, sha512
Dim hashAlg As String
hashAlg = "sha256"

' 16 bytes
Dim saltHex As String
saltHex = "78578E5A5D63CB0668AB39B21C8637FA"

Dim iterationCount As Long
iterationCount = 100000

' Derive a 256-bit key from the password.
Dim outputBitLen As Long
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.)
Dim enc As String
enc = "hex"

Dim hexKey As String
hexKey = crypt.Pbkdf2(pw,pwCharset,hashAlg,saltHex,iterationCount,outputBitLen,enc)

Debug.Print hexKey

' Sample output:
' AE96E261E32792D0FD6F0E72F8E872D046F7DB4C1FA7C83892EC73C49F461B70