(Java) ClickBank Decrypt Instant Notification

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

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // 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();
    boolean 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);
    System.out.println(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);
    System.out.println("Decrypted: " + bdNotif.getString("utf-8"));
  }
}