Derive a key in hex format of any length from a password with the salt in hex format.
public static string Kdf2( int dkLen, string pwdStr, string saltHex, int count, HashAlgorithm hashAlg )
Public Shared Function Kdf2 ( _ dkLen As Integer, _ pwdStr As String, _ saltHex As String, _ count As Integer, _ hashAlg As HashAlgorithm _ ) As String
VB6/C equivalent: PBE_Kdf2Hex