我有一个与文件解密有关的特定问题。我在Java中找到了一个程序,它解密特定的文件(这是一个游戏中的游戏保存文件,你可以在这里找到该文件的示例:https://www.adrive.com/public/6dbshx/game.sii),我想把这个程序重写成C#-这样我就可以把它集成到我用C#编写的所有不同的程序中。这是我第一次使用加密文件,所以我做的程序不能工作,实际上我不知道如何调试它。我写的程序有固定的文件路径-这是临时解决方案。
package scsc;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.lang.reflect.Field;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.security.Permission;
import java.security.PermissionCollection;
import java.util.Map;
import java.util.zip.InflaterInputStream;
/*
* Published under the Do What the Fuck You Want to Public License ( http://www.wtfpl.net/ )
*/
public class ScsC {
private static byte[] AES_KEY = new byte[]{
(byte) 0x2a, (byte) 0x5f, (byte) 0xcb, (byte) 0x17,
(byte) 0x91, (byte) 0xd2, (byte) 0x2f, (byte) 0xb6,
(byte) 0x02, (byte) 0x45, (byte) 0xb3, (byte) 0xd8,
(byte) 0x36, (byte) 0x9e, (byte) 0xd0, (byte) 0xb2,
(byte) 0xc2, (byte) 0x73, (byte) 0x71, (byte) 0x56,
(byte) 0x3f, (byte) 0xbf, (byte) 0x1f, (byte) 0x3c,
(byte) 0x9e, (byte) 0xdf, (byte) 0x6b, (byte) 0x11,
(byte) 0x82, (byte) 0x5a, (byte) 0x5d, (byte) 0x0a,
};
public static void main(String[] args) throws Exception {
if (args.length < 1) {
System.out.println("ERROR: expecting at least one file.");
} else {
removeCryptographyRestrictions();
for (String filename : args) {
decrypt(filename);
}
}
}
private static void decrypt(String filename) throws Exception {
File scsc = new File(filename);
if (!scsc.isFile() || !scsc.canWrite()) {
throw new IllegalArgumentException(filename + " is not a writable file.");
}
boolean encrypted = isEncrypted(scsc);
if (!encrypted) {
System.out.println(scsc + " does not seem to be encrypted.");
} else {
File decrypted = decrypt(scsc);
Files.copy(decrypted.toPath(), scsc.toPath(), StandardCopyOption.REPLACE_EXISTING);
System.out.println("decrypted: " + scsc);
}
}
private static boolean isEncrypted(File file) throws Exception {
byte[] header = new byte[4];
FileInputStream fis = new FileInputStream(file);
if (fis.read(header) != header.length) {
throw new RuntimeException("could not read header of " + file);
}
fis.close();
String headerAsString = new String(header, Charset.forName("UTF-8"));
return "ScsC".equals(headerAsString);
}
private static File decrypt(File input) throws Exception {
File out = File.createTempFile("scsc-", ".tmp");
out.deleteOnExit();
byte[] data = new byte[(int) (input.length())];
FileInputStream fis = new FileInputStream(input);
if (fis.read(data) != data.length) {
throw new RuntimeException("Could not read " + input + " into memory");
}
fis.close();
byte[] cipherText = new byte[data.length - 0x38];
byte[] iv = new byte[0x10];
System.arraycopy(data, 0x38, cipherText, 0, cipherText.length);
System.arraycopy(data, 0x24, iv, 0, iv.length);
byte[] decrypted = decrypt(cipherText, AES_KEY, iv);
ByteArrayInputStream bis = new ByteArrayInputStream(decrypted);
InflaterInputStream iis = new InflaterInputStream(bis);
InputStreamReader ir = new InputStreamReader(iis);
BufferedReader br = new BufferedReader(ir);
FileOutputStream fos = new FileOutputStream(out);
OutputStreamWriter osw = new OutputStreamWriter(fos);
PrintWriter pw = new PrintWriter(osw);
for (String line = br.readLine(); line != null; line = br.readLine()) {
pw.println(line);
}
pw.close();
br.close();
return out;
}
private static byte[] decrypt(byte[] cipherText, byte[] keyBytes, byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
return cipher.doFinal(cipherText);
}
private static void removeCryptographyRestrictions() throws Exception {
// taken from http://stackoverflow.com/questions/1179672/unlimited-strength-jce-policy-files
final Class<?> jceSecurity = Class.forName("javax.crypto.JceSecurity");
final Class<?> cryptoPermissions = Class.forName("javax.crypto.CryptoPermissions");
final Class<?> cryptoAllPermission = Class.forName("javax.crypto.CryptoAllPermission");
final Field isRestrictedField = jceSecurity.getDeclaredField("isRestricted");
isRestrictedField.setAccessible(true);
isRestrictedField.set(null, false);
final Field defaultPolicyField = jceSecurity.getDeclaredField("defaultPolicy");
defaultPolicyField.setAccessible(true);
final PermissionCollection defaultPolicy = (PermissionCollection) defaultPolicyField.get(null);
final Field perms = cryptoPermissions.getDeclaredField("perms");
perms.setAccessible(true);
((Map<?, ?>) perms.get(defaultPolicy)).clear();
final Field instance = cryptoAllPermission.getDeclaredField("INSTANCE");
instance.setAccessible(true);
defaultPolicy.add((Permission) instance.get(null));
}
}
SiiNunit
{
economy : _nameless.0357.B5D0 {
bank: _nameless.0371.CD48
player: _nameless.0369.3070
companies: 811
companies[0]: company.volatile.trameri.esbjerg
companies[1]: company.volatile.bcp.turku
companies[2]: company.volatile.itcc.liege
companies[3]: company.volatile.tree_et.geneve
companies[4]: company.volatile.tree_et.arhus
companies[5]: company.volatile.itcc.jonkoping
companies[6]: company.volatile.kaarfor.poznan
companies[7]: company.volatile.fcp.milano
companies[8]: company.volatile.posped.swansea
companies[9]: company.volatile.tradeaux.lille
companies[10]: company.volatile.euroacres.osnabruck
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public partial class Form1 : Form
{
string file_original;
byte[] file_orig_bytes;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
byte[] AES_KEY = new byte[]{
(byte) 0x2a, (byte) 0x5f, (byte) 0xcb, (byte) 0x17,
(byte) 0x91, (byte) 0xd2, (byte) 0x2f, (byte) 0xb6,
(byte) 0x02, (byte) 0x45, (byte) 0xb3, (byte) 0xd8,
(byte) 0x36, (byte) 0x9e, (byte) 0xd0, (byte) 0xb2,
(byte) 0xc2, (byte) 0x73, (byte) 0x71, (byte) 0x56,
(byte) 0x3f, (byte) 0xbf, (byte) 0x1f, (byte) 0x3c,
(byte) 0x9e, (byte) 0xdf, (byte) 0x6b, (byte) 0x11,
(byte) 0x82, (byte) 0x5a, (byte) 0x5d, (byte) 0x0a,
};
string path = "game.sii";
load_file_to_memory(path);
//decrypt_file(AES_KEY);
byte[] iv = new byte[0x10];
byte[] cipherText = new byte[file_orig_bytes.Length - 0x38];
Array.Copy(file_orig_bytes, 0x38, cipherText, 0, cipherText.Length);
Array.Copy(file_orig_bytes, 0x24, iv, 0, iv.Length);
string new_file = DecryptStringFromBytes_Aes(cipherText, AES_KEY, iv);
int a;
}
private void load_file_to_memory(string path)
{
file_original = File.ReadAllText(path);
file_orig_bytes = File.ReadAllBytes(path);
int i;
}
static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key
, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an Aes object
// with the specified key and IV.
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
这是我的版本,似乎工作得很好。上一段代码的问题是,原始java版本中未加密的内容被“InflaterInputStream”类所篡改,在C#中,我在SharpZipLib中找到了这个类。
public class Test2
{
static string file_original;
static byte[] file_orig_bytes;
static void Main(string[] args)
{
byte[] AES_KEY = new byte[]{
(byte) 0x2a, (byte) 0x5f, (byte) 0xcb, (byte) 0x17,
(byte) 0x91, (byte) 0xd2, (byte) 0x2f, (byte) 0xb6,
(byte) 0x02, (byte) 0x45, (byte) 0xb3, (byte) 0xd8,
(byte) 0x36, (byte) 0x9e, (byte) 0xd0, (byte) 0xb2,
(byte) 0xc2, (byte) 0x73, (byte) 0x71, (byte) 0x56,
(byte) 0x3f, (byte) 0xbf, (byte) 0x1f, (byte) 0x3c,
(byte) 0x9e, (byte) 0xdf, (byte) 0x6b, (byte) 0x11,
(byte) 0x82, (byte) 0x5a, (byte) 0x5d, (byte) 0x0a,
};
string path = @"C:\temp_10\game.sii";
load_file_to_memory(path);
//decrypt_file(AES_KEY);
byte[] iv = new byte[0x10];
byte[] cipherText = new byte[file_orig_bytes.Length - 0x38];
Array.Copy(file_orig_bytes, 0x38, cipherText, 0, cipherText.Length);
Array.Copy(file_orig_bytes, 0x24, iv, 0, iv.Length);
byte[] decoded_binary_content = AESDecrypt(cipherText, AES_KEY, iv);
string decoded_string_content = "";
using (MemoryStream ms = new MemoryStream(decoded_binary_content))
using (ICSharpCode.SharpZipLib.Zip.Compression.Streams.InflaterInputStream iis = new ICSharpCode.SharpZipLib.Zip.Compression.Streams.InflaterInputStream(ms))
using (StreamReader sr = new StreamReader(iis))
decoded_string_content = sr.ReadToEnd();
}
private static void load_file_to_memory(string path)
{
file_original = File.ReadAllText(path);
file_orig_bytes = File.ReadAllBytes(path);
}
//http://lamahashim.blogspot.it/2009/08/encyptiondecryption-in-c-and-java.html
static byte[] AESDecrypt(byte[] encryptedData, byte[] keyBytes, byte[] iv)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.None;
rijndaelCipher.IV = iv;
rijndaelCipher.KeySize = 0x80;
rijndaelCipher.BlockSize = 0x80;
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = iv;
byte[] plainText = rijndaelCipher.CreateDecryptor().TransformFinalBlock(encryptedData, 0, encryptedData.Length);
return plainText;
}
}
我已经从代码中显示的url复制了解密函数
我试图解密C#加密数据在Java没有成功。我用的是128位密钥 这是java代码: 你知道会出什么问题吗? 谢谢 使现代化 对不起,我太笨了,我忘了写实际的错误消息。这是: 线程“main”javax中出现异常。加密。BadPaddingException:组织中的填充块已损坏。弹跳船舱。jcajce。供应商。对称的。util。基本分组密码。javax上的engineDoFinal(未知源代码)。
null Edit2:为了一致性和正确性,将填充重命名为iVector。
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