我已经将基于C#的解密函数转换为Java。它工作正常,可用于解密已被C#程序加密的密码。 这里是源代码:为什么解密函数返回垃圾代码?
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.Key;
public class TestDecrpt {
public static void main(String[] args) throws Exception {
String data = "encrypted data";
String sEncryptionKey = "encryption key";
byte[] rawData = new Base64().decode(data);
byte[] salt = new byte[8];
System.arraycopy(rawData, 0, salt, 0, salt.length);
Rfc2898DeriveBytes keyGen = new Rfc2898DeriveBytes(sEncryptionKey, salt);
byte[] IV = keyGen.getBytes(128/8);
byte[] keyByte = keyGen.getBytes(256/8);
Key key = new SecretKeySpec(keyByte, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV));
int pureDataLength = rawData.length - 8;
byte[] pureData = new byte[pureDataLength];
System.arraycopy(rawData, 8, pureData, 0, pureDataLength);
String plaintext = new String(cipher.doFinal(pureData), "UTF-8").replaceAll("\u0000", "");
System.out.println(plaintext);
}
}
我按照它的算法写的加密功能。和代码是:
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.Key;
import java.security.SecureRandom;
public class testEncrypt {
public static void main(String[] args) throws Exception {
String data = "[email protected][email protected][email protected][email protected][email protected]";
String sEncryptionKey = "encryption key"; # the same key
byte[] rawData = new Base64().decode(data);
SecureRandom random = new SecureRandom();
byte[] salt = new byte[8];
random.nextBytes(salt);
Rfc2898DeriveBytes keyGen = new Rfc2898DeriveBytes(sEncryptionKey, salt);
byte[] IV = keyGen.getBytes(128/8);
byte[] keyByte = keyGen.getBytes(256/8);
Key key = new SecretKeySpec(keyByte, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV));
byte[] out2 = cipher.doFinal(rawData);
byte[] out = new byte[8 + out2.length];
System.arraycopy(salt, 0, out, 0, 8);
System.arraycopy(out2, 0, out, 8, out2.length);
//String outStr=new String(out,"UTF-8");
String outStr = new Base64().encodeToString(out);
System.out.println(outStr);
System.out.print(outStr.length());
}
}
然而,加密的数据不能被正确解密,它总是返回垃圾代码,如
ꉜ뙧巓妵峩枢펶땝ꉜ뙧巓妵峩枢펶땝ꉜ뙧巓
加密函数有问题吗?
============================================== ================================== [更新] 代码改变为
byte[] rawData = data.getBytes("UTF-8");
后
数据可以成功加密和解密。 但是,用Java加密的数据无法在C#中正确解密。 这里是C#版本解密函数:
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Test
{
class Program
{
public static void Main(string[] args)
{
string data="EncryptedData";
string sEncryptionKey="EncryptionKey";
byte[] rawData = Convert.FromBase64String(data);
byte[] salt = new byte[8];
for (int i = 0; i < salt.Length; i++)
salt[i] = rawData[i];
Rfc2898DeriveBytes keyGenerator = new Rfc2898DeriveBytes(sEncryptionKey, salt);
Rijndael aes = Rijndael.Create();
aes.IV = keyGenerator.GetBytes(aes.BlockSize/8);
aes.Key = keyGenerator.GetBytes(aes.KeySize/8);
using (MemoryStream memoryStream = new MemoryStream())
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
cryptoStream.Write(rawData, 8, rawData.Length - 8);
cryptoStream.Close();
byte[] decrypted = memoryStream.ToArray();
Console.Out.WriteLine(Encoding.Unicode.GetString(decrypted));
Console.In.ReadLine();
}
}
}
}
我发现,原来的代码使用的是“统一”作为输出格式,
Encoding.Unicode.GetString(decrypted)
所以我改变我的Java代码为“统一”。
对于解密在Java中:
String plaintext = new String(cipher.doFinal(pureData), "Unicode");
System.out.println(plaintext);
对于加密在Java中:
byte[] rawData = data.getBytes("Unicode");
但是使用C#代码来解密已加密的由Java程序仍然满足垃圾码的数据。
我该如何解决这个问题?有什么魔术技巧吗?
[最后更新] 使用 “UTF-16LE”,而不是 “UTF-8” 之后,这个问题已经没有了。看起来,“UTF-16LE”是Java相当于C#的“Unicode”。
这是用于研究/教育的目的是什么?如果不是,我必须警告你,编写自己的安全核心通常不是明智的做法。犯错非常容易,并且有很好的标准库和工具可用。 – 2012-08-07 06:38:16