/*
* Copyright 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.paymentexpress.server.decrypt;
import org.keyczar.Crypter;
import org.keyczar.SignedSessionDecrypter;
import org.keyczar.Verifier;
import org.keyczar.exceptions.KeyczarException;
import com.google.paymentexpress.jwt.EncryptedData;
/**
* Decryption class that uses the Keyczar library to decrypt
*
* @author pying@google.com(peng ying)
*/
public class Decrypter {
//TODO(pying): move these to tests
//private final String testField = "AJhTpaEAAABJAEtIOzL1d1tmfl3d13rd15S67YcuuIlqnebBqxz_c4KxY2TxsGLtWwWpr4zOa2Zy3NF7aIvzIhGXUNVj4UMuFZdoskwy9KsYpTAsAhQeiYDvVwxOBS-jYsJQC9eS6dq8BgIUCbsPNkq_BwCU2J8GK855CnEY5_EAAAAAAAAA";
//private final String testSession = "AMmCkmwoM6P3m5peXP027PItHRmg66YwYA7oduNQWoXWAmq8evera4_m24hGbMSRKJDWsYxBdKI9aMJr75dzoC2C-mNz-pAwJ090N7217SD1L3pK1XaUPoOY-XT7vjSCrMJ79QLFOmdTD55hM7zWxI_w8r4lUB-Q7op41xHihaRR79FsbH-7RKjoYwiM6BROyV8EOya-toF3Odg9UKO6q782vJyBHTKDyyLruRTAZTenyPCcGw1VC8yA6pbAosFlghIQSSVb0tM_WFO9l55jlreEPSLmDIoI4EzwmK34Fr1T1ZeQ2qEQrcvfNRYKWhxhfHleKyYZxYcK8iCXEIrlm3ko_q5h";
private Crypter decrypter;
private Verifier verifier;
/**
* Constructor
*/
public Decrypter(){
}
public Decrypter(String rsaKeys, String dsaKeys){
}
public String decrypt(EncryptedData ed) throws KeyczarException{
//TODO(pying): convert from content to JSON objects
//TODO(pying): build out more functionality for this class
//base64 decode to binary data
byte[] fieldBytes = org.keyczar.util.Base64Coder.decode(ed.getField_data());
String sessionData = ed.getSession_data();
decrypter = new Crypter(new KeyczarHardCodedReader());
verifier = new Verifier(new KeyczarHardCodedVerifier());
SignedSessionDecrypter sessionDecrypter = new SignedSessionDecrypter(decrypter, verifier, sessionData);
byte[] plainText = sessionDecrypter.decrypt(fieldBytes);
return new String(plainText);
}
}