Fix issue with decryption for standard jre.

build.gradle

@@ -17,7 +17,16 @@ task fatJar(type: Jar) {
                 'Main-Class': 'moe.clienthax.crunched.Crunched'
     }
     baseName = project.name + '-all'
-    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
+    from { configurations.compile.collect
+            {
+                it.isDirectory() ? it : zipTree(it)
+            }
+    }
+            {
+                exclude "META-INF/*.SF"
+                exclude "META-INF/*.DSA"
+                exclude "META-INF/*.RSA"
+            }
     with jar
 }
 
@@ -31,4 +40,5 @@ dependencies {
     compile group: 'me.tongfei', name: 'progressbar', version: '0.5.5'
     compile group: 'org.apache.commons', name: 'commons-exec', version: '1.3'
     compile group: 'commons-cli', name: 'commons-cli', version: '1.4'
+    compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.58'
 }

src/main/java/moe/clienthax/crunched/subtitles/SubtitleDecrypter.java

@@ -1,14 +1,26 @@
 package moe.clienthax.crunched.subtitles;
 
 import org.apache.commons.io.IOUtils;
+import org.bouncycastle.crypto.BufferedBlockCipher;
+import org.bouncycastle.crypto.CipherParameters;
+import org.bouncycastle.crypto.PBEParametersGenerator;
+import org.bouncycastle.crypto.digests.SHA256Digest;
+import org.bouncycastle.crypto.engines.AESEngine;
+import org.bouncycastle.crypto.generators.PKCS12ParametersGenerator;
+import org.bouncycastle.crypto.modes.CBCBlockCipher;
+import org.bouncycastle.crypto.paddings.PKCS7Padding;
+import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
+import org.bouncycastle.crypto.params.KeyParameter;
+import org.bouncycastle.crypto.params.ParametersWithIV;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.NodeList;
 
 import javax.crypto.Cipher;
 import javax.crypto.spec.IvParameterSpec;
 import javax.crypto.spec.SecretKeySpec;
-import java.io.File;
+import javax.xml.bind.DatatypeConverter;
+import java.io.*;
 import java.net.URL;
 import java.security.MessageDigest;
 import java.util.Base64;
@@ -22,6 +34,32 @@
 @SuppressWarnings("SameParameterValue")
 class SubtitleDecrypter {
 
+
+    //Decrypt with BC to get past the jce limited bits on lower java versions... ugh
+    public static byte[] lwDecrypt(byte[] iv, byte[] key, byte[] encrypted) throws Exception {
+
+        BufferedBlockCipher aes = new BufferedBlockCipher(new CBCBlockCipher(new AESEngine()));
+        CipherParameters ivAndKey = new ParametersWithIV(new KeyParameter(key), iv);
+        aes.init(false, ivAndKey);
+
+        byte[] decryptedBytes = cipherData(aes, encrypted);
+        return decryptedBytes;
+
+    }
+
+    private static byte[] cipherData(BufferedBlockCipher cipher, byte[] data)
+            throws Exception {
+        int minSize = cipher.getOutputSize(data.length);
+        byte[] outBuf = new byte[minSize];
+        int length1 = cipher.processBytes(data, 0, data.length, outBuf, 0);
+        int length2 = cipher.doFinal(outBuf, length1);
+        int actualLength = length1 + length2;
+        byte[] result = new byte[actualLength];
+        System.arraycopy(outBuf, 0, result, 0, result.length);
+        return result;
+    }
+
+
     //TODO make this use bouncy castle because javas aes impl is limited by default for dumb reasons..
     static void decryptAndConvertSubtitle(File folder, SubtitleInfo subtitle) {
         //Here be dragons...
@@ -50,10 +88,13 @@ static void decryptAndConvertSubtitle(File folder, SubtitleInfo subtitle) {
             byte[] ivBytes = Base64.getDecoder().decode(ivString);
             byte[] dataBytes = Base64.getDecoder().decode(dataString);
 
+            /*
             Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
             cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptionKey, "AES"), new IvParameterSpec(ivBytes));
 
             byte[] zlibData = cipher.doFinal(dataBytes);
+            */
+            byte[] zlibData = lwDecrypt(ivBytes, decryptionKey, dataBytes);
             byte[] decompressed = decompressZlib(zlibData);
 
             String xml = new String(decompressed);