├── LICENSE ├── README.md └── src └── me └── nov └── reversecrypt ├── Extractor.java ├── ReverseCrypt.java ├── exception └── ExtractException.java └── extractors ├── CoreProtectEx.java ├── JCryptEx.java ├── JarProtectorEx.java └── XMC2Ex.java /LICENSE: -------------------------------------------------------------------------------- 1 | 2 | GNU GENERAL PUBLIC LICENSE 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The GNU General Public License is a free, copyleft license for 12 | software and other kinds of works. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 614 | 615 | If the disclaimer of warranty and limitation of liability provided 616 | above cannot be given local legal effect according to their terms, 617 | reviewing courts shall apply local law that most closely approximates 618 | an absolute waiver of all civil liability in connection with the 619 | Program, unless a warranty or assumption of liability accompanies a 620 | copy of the Program in return for a fee. 621 | 622 | END OF TERMS AND CONDITIONS -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## What is this project about? 2 | The ReverseCrypter can extract jar archives crypted by various java-crypters. The extractors (and their keys!) are hard-coded and may not work for newer versions. 3 | 4 | ## Supported Crypters 5 | | Crypter | Extractor | 6 | | --- | --- | 7 | | CoreProtect by xmcgamer0x | CoreProtectEx | 8 | | XMC2 (Old CorePt.) by xmcgamer0x | XMC2Ex | 9 | | JCrypt 1.5 by redpois0n | JCryptEx | 10 | | JarProtector 1.1.1 by Burn3diC3 | JarProtectorEx | 11 | 12 | ## CLI 13 | | Argument | Description | 14 | | --- | --- | 15 | | --help | Displays help | 16 | | --input | Specify input file | 17 | | --output | Specify output file | 18 | | --extractor | Specify extractor | 19 | 20 | ## Libraries needed 21 | commons-io 2.6, commons-cli 1.4 22 | 23 | ## License 24 | ReverseCrypt is licensed under the GNU General Public License 3.0 -------------------------------------------------------------------------------- /src/me/nov/reversecrypt/Extractor.java: -------------------------------------------------------------------------------- 1 | package me.nov.reversecrypt; 2 | 3 | import java.util.jar.JarFile; 4 | 5 | public abstract class Extractor { 6 | protected JarFile file; 7 | 8 | public Extractor(JarFile file) { 9 | super(); 10 | this.file = file; 11 | } 12 | 13 | public abstract byte[] extract(); 14 | } 15 | -------------------------------------------------------------------------------- /src/me/nov/reversecrypt/ReverseCrypt.java: -------------------------------------------------------------------------------- 1 | package me.nov.reversecrypt; 2 | 3 | import java.io.File; 4 | import java.io.FileNotFoundException; 5 | import java.nio.file.Files; 6 | import java.util.jar.JarFile; 7 | 8 | import org.apache.commons.cli.CommandLine; 9 | import org.apache.commons.cli.CommandLineParser; 10 | import org.apache.commons.cli.DefaultParser; 11 | import org.apache.commons.cli.HelpFormatter; 12 | import org.apache.commons.cli.Options; 13 | 14 | public class ReverseCrypt { 15 | 16 | public static void main(String[] args) throws Exception { 17 | Options options = new Options(); 18 | options.addOption("i", "input", true, "The crypted input file to use"); 19 | options.addOption("o", "output", true, "The decrypted output file"); 20 | options.addOption("ex", "extractor", true, "The extractor to use"); 21 | options.addOption("help", false, "Prints this help"); 22 | 23 | CommandLineParser parser = new DefaultParser(); 24 | CommandLine line; 25 | try { 26 | line = parser.parse(options, args); 27 | } catch (org.apache.commons.cli.ParseException e) { 28 | e.printStackTrace(); 29 | throw new RuntimeException("An error occurred while parsing the commandline "); 30 | } 31 | if (line.hasOption("help") || !line.hasOption("i") || !line.hasOption("o") || !line.hasOption("ex")) { 32 | HelpFormatter formatter = new HelpFormatter(); 33 | formatter.printHelp("ReverseCrypter", options); 34 | return; 35 | } 36 | File input = new File(line.getOptionValue("i")); 37 | File output = new File(line.getOptionValue("o")); 38 | if (!input.exists()) { 39 | throw new FileNotFoundException(input.getAbsolutePath()); 40 | } 41 | if (output.exists()) { 42 | System.err.println("Warning: Output already exists, renaming existing file"); 43 | File existing = new File(line.getOptionValue("o")); 44 | File newName = new File(line.getOptionValue("o") + "-BAK"); 45 | if (newName.exists()) { 46 | newName.delete(); 47 | } 48 | existing.renameTo(newName); 49 | } 50 | Class ex = null; 51 | try { 52 | ex = Class.forName(line.getOptionValue("ex")); 53 | } catch (ClassNotFoundException e) { 54 | try { 55 | ex = Class.forName("me.nov.reversecrypt.extractors." + line.getOptionValue("ex")); 56 | } catch (ClassNotFoundException e1) { 57 | throw new RuntimeException("Extractor not found"); 58 | } 59 | } 60 | Extractor e = (Extractor) ex.getConstructor(JarFile.class).newInstance(new JarFile(input)); 61 | Files.write(output.toPath(), e.extract()); 62 | } 63 | 64 | } 65 | -------------------------------------------------------------------------------- /src/me/nov/reversecrypt/exception/ExtractException.java: -------------------------------------------------------------------------------- 1 | package me.nov.reversecrypt.exception; 2 | 3 | public class ExtractException extends RuntimeException { 4 | private static final long serialVersionUID = 1L; 5 | 6 | public ExtractException(String string) { 7 | super(string); 8 | } 9 | 10 | public ExtractException(Throwable t) { 11 | super(t); 12 | } 13 | 14 | } 15 | -------------------------------------------------------------------------------- /src/me/nov/reversecrypt/extractors/CoreProtectEx.java: -------------------------------------------------------------------------------- 1 | package me.nov.reversecrypt.extractors; 2 | 3 | import java.io.ByteArrayInputStream; 4 | import java.io.ByteArrayOutputStream; 5 | import java.io.DataInputStream; 6 | import java.util.Enumeration; 7 | import java.util.jar.JarEntry; 8 | import java.util.jar.JarFile; 9 | 10 | import org.apache.commons.io.IOUtils; 11 | 12 | import me.nov.reversecrypt.Extractor; 13 | 14 | public class CoreProtectEx extends Extractor { 15 | 16 | /** 17 | * You'll find this somewhere in the JarFile decryption method (usually 60 18 | * chars) 19 | */ 20 | private String key = "3WEU1MMgXbBsXP5VAjCVZy3PQXovTW3WEU1MMgXbBsXP5VAjCVZy3PQXovTW"; 21 | 22 | public CoreProtectEx(JarFile file) { 23 | super(file); 24 | } 25 | 26 | @Override 27 | public byte[] extract() { 28 | try { 29 | System.out.println("Decrypting CoreProtect using key " + key); 30 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); 31 | 32 | Enumeration e = file.entries(); 33 | while (e.hasMoreElements()) { 34 | JarEntry entry = (JarEntry) e.nextElement(); 35 | if (entry.getName().startsWith("META-INF")) 36 | continue; 37 | byte[] bytes = IOUtils.toByteArray(file.getInputStream(entry)); 38 | String cafebabe = String.format("%02X%02X%02X%02X", bytes[0], bytes[1], bytes[2], bytes[3]); 39 | if (cafebabe.toLowerCase().equals("cafebabe")) { 40 | //entry is a class file, continue 41 | continue; 42 | } 43 | DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytes)); 44 | String utf = dis.readUTF(); 45 | Engine rc4 = new Engine(utf.getBytes()); 46 | int length = dis.readInt(); 47 | byte[] array = new byte[length]; 48 | 49 | for (int i = 0; i < length; ++i) { 50 | array[i] = dis.readByte(); 51 | } 52 | 53 | byte[] decrypted = rc4.a(array); 54 | baos.write(new Engine(key.getBytes()).a(decrypted)); 55 | } 56 | baos.close(); 57 | String subKey = key.substring(0, 30); //warning: this could be something different, check jar 58 | return new Engine(subKey.getBytes()).a(baos.toByteArray()); 59 | } catch (Exception e) { 60 | throw new RuntimeException(e); 61 | } 62 | } 63 | 64 | @SuppressWarnings("unused") 65 | private class Engine { 66 | //this is probably RC4 encryption but i'm not sure 67 | 68 | private int[] a = new int[256]; 69 | private final int b; 70 | 71 | public Engine(byte[] var1) { 72 | if (var1.length >= 1 && var1.length <= 256) { 73 | this.b = var1.length; 74 | 75 | int var2; 76 | for (var2 = 0; var2 < 256; this.a[var2] = var2++) { 77 | ; 78 | } 79 | 80 | var2 = 0; 81 | 82 | for (int var3 = 0; var3 < 256; ++var3) { 83 | var2 = (var2 + this.a[var3] + var1[var3 % this.b]) % 256; 84 | int var4 = this.a[var3]; 85 | this.a[var3] = this.a[var2]; 86 | this.a[var2] = var4; 87 | } 88 | 89 | } else { 90 | throw new IllegalArgumentException("key must be between 1 and 256 bytes"); 91 | } 92 | } 93 | 94 | private int[] a(int[] var1) { 95 | int[] var2 = new int[var1.length]; 96 | int[] var3 = new int[this.a.length]; 97 | System.arraycopy(this.a, 0, var3, 0, var3.length); 98 | int var4 = 0; 99 | int var5 = 0; 100 | 101 | for (int var6 = 0; var6 < var1.length; ++var6) { 102 | var4 = var4 + 1 & 255; 103 | var5 = var5 + var3[var4] & 255; 104 | var3[var4] ^= var3[var5]; 105 | var3[var5] ^= var3[var4]; 106 | var3[var4] ^= var3[var5]; 107 | int var13 = var3[var4] + var3[var5] & 255; 108 | int var14 = var3[var13]; 109 | var2[var6] = var1[var6] ^ var14; 110 | } 111 | 112 | return var2; 113 | } 114 | 115 | private int[] c(byte[] var1) { 116 | int[] var2 = new int[var1.length]; 117 | 118 | for (int var3 = 0; var3 < var1.length; ++var3) { 119 | var2[var3] = var1[var3]; 120 | } 121 | 122 | return var2; 123 | } 124 | 125 | private byte[] b(int[] var1) { 126 | byte[] var2 = new byte[var1.length]; 127 | 128 | for (int var3 = 0; var3 < var1.length; ++var3) { 129 | var2[var3] = (byte) var1[var3]; 130 | } 131 | 132 | return var2; 133 | } 134 | 135 | public byte[] a(byte[] var1) { 136 | int[] var2 = this.c(var1); 137 | 138 | for (int var3 = 0; var3 < var2.length; ++var3) { 139 | var2[var3] &= 255; 140 | } 141 | 142 | byte[] var4 = this.b(this.a(var2)); 143 | return var4; 144 | } 145 | 146 | public byte[] b(byte[] var1) { 147 | byte[] var2 = this.b(this.a(this.c(var1))); 148 | return var2; 149 | } 150 | } 151 | 152 | } 153 | -------------------------------------------------------------------------------- /src/me/nov/reversecrypt/extractors/JCryptEx.java: -------------------------------------------------------------------------------- 1 | package me.nov.reversecrypt.extractors; 2 | 3 | import java.util.jar.JarEntry; 4 | import java.util.jar.JarFile; 5 | 6 | import javax.crypto.Cipher; 7 | import javax.crypto.CipherInputStream; 8 | import javax.crypto.spec.IvParameterSpec; 9 | import javax.crypto.spec.SecretKeySpec; 10 | 11 | import org.apache.commons.io.IOUtils; 12 | 13 | import me.nov.reversecrypt.Extractor; 14 | import me.nov.reversecrypt.exception.ExtractException; 15 | 16 | public class JCryptEx extends Extractor { 17 | 18 | private String path = "jar.dat"; 19 | 20 | public JCryptEx(JarFile file) { 21 | super(file); 22 | } 23 | 24 | public JCryptEx(JarFile file, String jarInside) { 25 | super(file); 26 | this.path = jarInside; 27 | } 28 | 29 | @SuppressWarnings("unused") 30 | @Override 31 | public byte[] extract() { 32 | JarEntry e = file.getJarEntry(path); 33 | if (e == null) { 34 | throw new ExtractException(path + " inside jar not found"); 35 | } 36 | byte[] extra = e.getExtra(); 37 | byte[] key = new byte[16]; 38 | System.arraycopy(extra, 0, key, 0, 16); 39 | byte[] iv = new byte[16]; 40 | System.arraycopy(extra, 16, iv, 0, 16); 41 | boolean encryptedResources = extra[32] == 1; 42 | byte[] bMainClass = new byte[extra.length - 33]; 43 | System.arraycopy(extra, 33, bMainClass, 0, extra.length - 33); 44 | String mainClass = new String(bMainClass); 45 | 46 | try { 47 | Cipher cipher = Cipher.getInstance("AES/CBC/NOPADDING"); 48 | SecretKeySpec sks = new SecretKeySpec(key, "AES"); 49 | cipher.init(2, sks, new IvParameterSpec(iv)); 50 | CipherInputStream cis = new CipherInputStream(file.getInputStream(e), cipher); 51 | return IOUtils.toByteArray(cis); 52 | } catch (Exception ex) { 53 | ex.printStackTrace(); 54 | } 55 | return null; 56 | } 57 | 58 | } 59 | -------------------------------------------------------------------------------- /src/me/nov/reversecrypt/extractors/JarProtectorEx.java: -------------------------------------------------------------------------------- 1 | package me.nov.reversecrypt.extractors; 2 | 3 | import java.io.IOException; 4 | import java.io.InputStream; 5 | import java.util.jar.JarEntry; 6 | import java.util.jar.JarFile; 7 | import java.util.zip.GZIPInputStream; 8 | 9 | import org.apache.commons.io.IOUtils; 10 | 11 | import me.nov.reversecrypt.Extractor; 12 | import sun.misc.BASE64Decoder; 13 | 14 | public class JarProtectorEx extends Extractor { 15 | 16 | private String configPath = "c.dat"; 17 | 18 | public JarProtectorEx(JarFile file) { 19 | super(file); 20 | } 21 | 22 | public JarProtectorEx(JarFile file, String config) { 23 | super(file); 24 | this.configPath = config; 25 | } 26 | 27 | @Override 28 | public byte[] extract() { 29 | try { 30 | String[] config = new String(getConfig(), "UTF-8").split("\n"); 31 | String path = config[1]; 32 | boolean compressed = Boolean.parseBoolean(config[4]); 33 | String key = config[5]; 34 | JarEntry e = file.getJarEntry(path); 35 | if(compressed) { 36 | //TODO test for compressed 37 | return decrypt(IOUtils.toByteArray(new GZIPInputStream(file.getInputStream(e))), key.getBytes()); 38 | } 39 | return decrypt(IOUtils.toByteArray(file.getInputStream(e)), key.getBytes()); 40 | } catch (Exception ex) { 41 | throw new RuntimeException(ex); 42 | } 43 | } 44 | 45 | private byte[] decrypt(byte[] enc, byte[] keybytes) { 46 | byte[] decrypted = (byte[])enc.clone(); 47 | int i = 0; 48 | 49 | for(int keyIndex = 0; i < decrypted.length; ++i) { 50 | decrypted[i] ^= keybytes[keyIndex++]; 51 | if(keyIndex == keybytes.length) { 52 | keyIndex = 0; 53 | } 54 | } 55 | return decrypted; 56 | } 57 | 58 | private byte[] getConfig() throws IOException { 59 | InputStream bytes = file.getInputStream(file.getJarEntry(configPath)); 60 | byte[] configBytes = (new BASE64Decoder()).decodeBuffer(bytes); 61 | 62 | for (int i = 0; i < configBytes.length; ++i) { 63 | configBytes[i] ^= -35; 64 | } 65 | 66 | return configBytes; 67 | } 68 | } 69 | -------------------------------------------------------------------------------- /src/me/nov/reversecrypt/extractors/XMC2Ex.java: -------------------------------------------------------------------------------- 1 | package me.nov.reversecrypt.extractors; 2 | 3 | import java.io.ByteArrayInputStream; 4 | import java.io.ByteArrayOutputStream; 5 | import java.io.DataInputStream; 6 | import java.util.Enumeration; 7 | import java.util.jar.JarEntry; 8 | import java.util.jar.JarFile; 9 | import java.util.jar.JarOutputStream; 10 | 11 | import org.apache.commons.io.IOUtils; 12 | 13 | import me.nov.reversecrypt.Extractor; 14 | 15 | public class XMC2Ex extends Extractor { 16 | 17 | public XMC2Ex(JarFile file) { 18 | super(file); 19 | } 20 | 21 | @Override 22 | public byte[] extract() { 23 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); 24 | try { 25 | JarOutputStream jar = new JarOutputStream(baos); 26 | Enumeration e = file.entries(); 27 | while (e.hasMoreElements()) { 28 | JarEntry entry = (JarEntry) e.nextElement(); 29 | if (entry.getName().startsWith("META-INF")) 30 | continue; 31 | byte[] bytes = IOUtils.toByteArray(file.getInputStream(entry)); 32 | if (isClass(bytes)) { 33 | continue; 34 | } 35 | String name = new String(xor90(entry.getName().getBytes())); 36 | byte[] xorBytes = xor90(bytes); 37 | if (isClass(xorBytes)) { 38 | name += ".class"; 39 | } else { 40 | System.err.println("Not a class: " + name); 41 | } 42 | JarEntry newFile = new JarEntry(name); 43 | jar.putNextEntry(newFile); 44 | jar.write(xorBytes); 45 | jar.closeEntry(); 46 | } 47 | jar.close(); 48 | baos.close(); 49 | } catch (Exception ex) { 50 | ex.printStackTrace(); 51 | } 52 | return baos.toByteArray(); 53 | } 54 | 55 | private static boolean isClass(byte[] bytes) { 56 | String cafebabe = String.format("%02X%02X%02X%02X", bytes[0], bytes[1], bytes[2], bytes[3]); 57 | if (cafebabe.toLowerCase().equals("cafebabe")) { 58 | return true; 59 | } 60 | return false; 61 | } 62 | 63 | private static byte[] xor90(byte[] var0) { 64 | final byte[] var = new byte[var0.length]; 65 | for (int var2 = 0; var2 < var0.length; ++var2) { 66 | var[var2] = (var0[var2] ^= 0x5A); 67 | } 68 | return var; 69 | } 70 | 71 | } 72 | --------------------------------------------------------------------------------