[charlesr]

OK

This code works.

I built this in MS Visual Studio 2005.

Create a normal windows application project in C#, called 'dcfundrm
'.

Place your '.dcf' files in the project folder at:
dcfundrm\bin\Debug

Make sure that you add a reference for 'ChilkatDotNet2.dll' as directed at 'http://www.example-code.com/csharp/step2.asp'

Once you have built the project, using the code below, run the program (CTL + F5), and type in the name of your '.dcf' file in the text box and press the submit button.

Code assembly:

1) Create a text box and button in 'Form1.cs[design]'.
2) In 'Form1.cs' copy & paste the following:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Chilkat;

namespace dcfundrm
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            createFile(textBox1.Text);
        }

        private void createFile(string fileName)
        {
            string fname = "Theme-Halloween.dcf";


            if(fileName=="")
            {
            fname = "Theme-Halloween.dcf";
            }
            else
            {
            fname = fileName;
            }

            if(fname.IndexOf(".")!=-1)
            {
                fname = fname.Substring(0, fname.Length - 4);
            }

            // A Chilkat Crypt unlock code will work here.
            Chilkat.OmaDrm omaDrm = new Chilkat.OmaDrm();
            omaDrm.UnlockComponent("Anything for 30-day trial");

            Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

            // Load an OMA DRM file.
            omaDrm.LoadDcfFile(fname + ".dcf");

            string msg = omaDrm.ContentType + "\r\n" +
                omaDrm.ContentUri + "\r\n" +
                omaDrm.Headers;

            MessageBox.Show(msg);

            // Get a specific header
            MessageBox.Show("Content-Description = " + omaDrm.GetHeaderField("content-description"));

            // Get the AES initialization vector
            // Display the IV in hex format.
            MessageBox.Show("IV: " + crypt.Encode(omaDrm.IV, "hex"));

            // Display 1st 20 bytes of encrypted data in hex format
            MessageBox.Show("Encrypted Data: " + crypt.Encode(omaDrm.EncryptedData, "hex").Substring(0, 20));

            // To decrypt, set the Base64 key and decrypt...
            omaDrm.Base64Key = "BiVVJOQee6y4PWYL+fbvJA==";

            // Display 1st 20 bytes of the decrypted data in hex format
            MessageBox.Show("Decrypted Data: " + crypt.Encode(omaDrm.DecryptedData, "hex").Substring(0, 20));

            // Save the decrypted data to a file.
            bool success = omaDrm.SaveDecrypted(fname + ".mp3");
            if (!success)
            {
                MessageBox.Show(omaDrm.LastErrorText);
            }
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }


    }



            
}