B4X

PBKDF1 - Derive Key from Password

See more Encryption Examples

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);

B4X

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

Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

Dim hexKey As String
'  http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

Dim pw As String = "password"
Dim pwCharset As String = "ansi"
'  Hash algorithms may be: sha1, md2, md5, etc.
Dim hashAlg As String = "sha1"
'  The salt should be 8 bytes:
Dim saltHex As String = "78578E5A5D63CB06"
Dim iterationCount As Int = 1000
'  Derive a 128-bit key from the password.
Dim outputBitLen As Int = 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.)
Dim enc As String = "hex"

hexKey = crypt.Pbkdf1(pw, pwCharset, hashAlg, saltHex, iterationCount, outputBitLen, enc)

Log(hexKey)

'  The output should have this value:
'  DC19847E05C64D2FAF10EBFB4A3D2A20