Android™

ClickBank Decrypt Instant Notification

See more ClickBank Examples

Demonstrates how to decrypt a ClickBank instant notification. See Instant Notification Service for more information and alternative code snippets. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

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

    //  secret key from your ClickBank account
    String secretKey = "MY_SECRET_KEY";

    String jsonStr = "{\"notification\":\"BASE64_NOTIFICATION\",\"iv\":\"BASE64_IV\"}";

    CkJsonObject json = new CkJsonObject();
    success = json.Load(jsonStr);

    //  Get the encrypted notification (binary) and IV from the JSON.
    CkBinData bdNotif = new CkBinData();
    CkBinData bdIv = new CkBinData();

    success = bdNotif.AppendEncoded(json.stringOf("notification"),"base64");
    success = bdIv.AppendEncoded(json.stringOf("iv"),"base64");

    //  Get an SHA1 digest (as a hex string) of the secret key.
    //  A SHA1 digest is 20 bytes.  Therefore the hex string is 40 chars.
    //  Treat each us-ascii char as a binary byte of the secret key.
    //  256-bit AES needs a 256-bit key, which is 32-bytes.  Therefore
    //  use the 1st 32 us-ascii chars of the hex SHA1 as the AES secret key.

    CkCrypt2 crypt = new CkCrypt2();
    //  Because we're using the hex string as the actual AES key, it matters whether the hex is uppercase or lowercase.
    //  We want lowercase.
    crypt.put_EncodingMode("hex_lower");
    crypt.put_HashAlgorithm("sha1");
    String hexSha1 = crypt.hashStringENC(secretKey);
    Log.i(TAG, hexSha1);

    //  Treat the hex string as binary data for the AES key..
    CkBinData bdKey = new CkBinData();
    bdKey.AppendString(hexSha1,"us-ascii");
    bdKey.RemoveChunk(32,8);

    crypt.put_KeyLength(256);
    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cbc");

    //  We can use any encoding because were just getting the binary bytes in an encoding, and then setting from the same encoding.
    //  We'll just use base64..
    crypt.SetEncodedIV(bdIv.getEncoded("base64"),"base64");
    crypt.SetEncodedKey(bdKey.getEncoded("base64"),"base64");

    crypt.DecryptBd(bdNotif);
    Log.i(TAG, "Decrypted: " + bdNotif.getString("utf-8"));

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}