(Excel) PBKDF1 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF1. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

It also matches the output produced by the .NET Framework using this C# code:

            byte[] salt = new byte[] { 0x78, 0x57, 0x8E, 0x5A, 0x5D, 0x63, 0xCB, 0x06 };
            PasswordDeriveBytes cdk = new PasswordDeriveBytes("password", salt);

            cdk.IterationCount = 1000;
            cdk.HashName = "SHA1";

            // generate a 16-byte key
            byte[] key = cdk.GetBytes(16);

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 = 1000
' Derive a 128-bit key from the password.

outputBitLen = 128

' 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.Pbkdf1(pw,pwCharset,hashAlg,saltHex,iterationCount,outputBitLen,enc)

Debug.Print hexKey

' The output should have this value:
' DC19847E05C64D2FAF10EBFB4A3D2A2