xposed-ouya-plain-purchases/src/main/java/de/cweiske/ouya/plainpurchases/PlainPurchases.java

   1 package de.cweiske.ouya.plainpurchases;
   2
   3 import javax.crypto.Cipher;
   4
   5 import de.robv.android.xposed.IXposedHookLoadPackage;
   6 import de.robv.android.xposed.XC_MethodHook;
   7 import de.robv.android.xposed.XposedBridge;
   8 import de.robv.android.xposed.XposedHelpers;
   9 import de.robv.android.xposed.callbacks.XC_LoadPackage;
  10
  11 /**
  12  * Hook into Java's main encryption method and simply return the input.
  13  * This disables encryption completely, and allows our OUYA store to retrieve
  14  * plain text requests and send plain text responses that the OUYA understands
  15  *
  16  * @author Christian Weiske <cweiske+ouya@cweiske.de>
  17  */
  18 public class PlainPurchases implements IXposedHookLoadPackage
  19 {
  20     @Override
  21     public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam)
  22     {
  23         //we cannot filter on lpparam.packagename because that breaks
  24         // in-game receipt decryption
  25
  26         //XposedBridge.log("Loaded app: " + lpparam.packageName);
  27
  28         XposedHelpers.findAndHookMethod(Cipher.class, "doFinal", byte[].class, new XC_MethodHook() {
  29             @Override
  30             protected void beforeHookedMethod(MethodHookParam param) {
  31                 byte[] input = (byte[]) param.args[0];
  32
  33                 //XposedBridge.log("input: " + new String(input));
  34                 //XposedBridge.log("returning unencrypted input");
  35                 //XposedBridge.log(new Exception("doFinal stack trace"));
  36                 param.setResult(input);
  37             }
  38         });
  39     }
  40 }