java c# 加密与解密对照

原文 java c# 加密与解密对照

最近一直烦恼，java , c# 加密的不同，然后整理了一下，留个备份的轮子： 

其中在 java、c#加密转换时，最重要的是 IV 的确定，我常常用如下方法使得java和c#之间的 IV 可以转换： 
将其中某个 IV 数组转为 10进制后，在转换为相应的 byte数组就好了。10进制数组成为 java、c# 中IV转换的桥梁了。最后分别有java(我用myeclipse)和c#的编译器(SharpDevelop2很轻量级的编译器，但是运行代码后需要在后面写上 "Console.ReadLine(); " ，不然dos框会一闪而过。这个编译器还需要系统中安装有.net 2.0或者其他版本)多多实践，这样可以更加直接的看到结果。 下面实例中java与c#的代码都是一一对应的：当然，这些加密算法并不适合所有的加密结构，但是重要的是 IV 、key 的格式化。 网上查了资料，找到java转换为16进制的方法(已测) 

// java格式化16进制输出
public static void formatIntTo16(byte[] bytes) {
    String[] resultBytes = new String[bytes.length];
    for (int i = 0; i < bytes.length; i++) {
        resultBytes[i] = Integer.toHexString(bytes[i] & 0xFF);
    }
}

//MD5加密
 public static String md5Encode(String strContent) {
    try {
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        byte[] tempBytes =  messageDigest.digest(strContent.getBytes("UnicodeLittleUnmarked"));
        StringBuffer stringBuffer = new StringBuffer();
        for(byte bytes: tempBytes) {
            String tempByte = Integer.toHexString(bytes & 0xFF);
            if(tempByte.length() == 1) {
                stringBuffer.append("0");
            }
            stringBuffer.append(tempByte);
        }
        return stringBuffer.toString();
    } catch(Exception e) {
        e.printStackTrace();
    }
    return null;
 }

//md5加密
    public static void MD5(string str) {
        string cl1 = str;
        string pwd = "";
        System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
        byte[] s = md5.ComputeHash(Encoding.Unicode.GetBytes(cl1));
        for (int i = 0; i < s.Length; i++) {
            pwd = pwd + s[i].ToString("x");
        }
        Console.Write(pwd);
        Console.WriteLine();
    }

// 3DES加密 基方法
    public static byte[] des3EncodeCBC(byte[] data, byte[] key) throws Exception {

        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);

        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(IV);
        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
        return cipher.doFinal(data, 0, data.length);

    }

// 3DES加密算法
    private static bool Encrypt( byte[] key, byte[] input, out byte[] output )
        {
            output = null;

            try
            {
                TripleDESCryptoServiceProvider trippleDesProvider = new TripleDESCryptoServiceProvider();
                ICryptoTransform encryptObj = trippleDesProvider.CreateEncryptor(rkey, IV);
                output = encryptObj.TransformFinalBlock(input, 0, input.Length);
                trippleDesProvider.Clear();
            }
            catch (Exception)
            {
                return false;
            }

            return true;
        }

// 3DES 解密 基方法
    public static byte[] des3DecodeCBC(byte[] data, byte[] key) throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("desede");
        deskey = keyFactory.generateSecret(spec);

        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(IV);
        cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
        return cipher.doFinal(data, 0, data.length);
    }

// 3DES 解密 基方法
    private static bool Decrypt(byte[] key, byte[] input, out byte[] output)
        {
            output = null;

            try
            {
                TripleDESCryptoServiceProvider trippleDesProvider = new TripleDESCryptoServiceProvider();
                ICryptoTransform decryptObj = trippleDesProvider.CreateDecryptor(key, IV);
                output = decryptObj.TransformFinalBlock(input, 0, input.Length);
                trippleDesProvider.Clear();
            }
            catch (Exception ex)
            {
                return false;
            }

            return true;
        }

//DES加密
    public static String encode(byte[] key, byte[] iv, byte[] data) throws Exception {
        Key deskey = null;
        DESKeySpec spec = new DESKeySpec(key);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        deskey = keyFactory.generateSecret(spec);
        IvParameterSpec ips = new IvParameterSpec(iv);
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
        return new BASE64Encoder().encode(cipher.doFinal(data, 0, data.length));
    }

 
       
       //DES加密      
       public static string DESEncode(string encryptString, string encryptKey) {    
               byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));    
               byte[] rgbIV = DESKeys;    
               byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);    
               DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();    
               MemoryStream mStream = new MemoryStream();    
               CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV),    
               CryptoStreamMode.Write);    
               cStream.Write(inputByteArray, 0, inputByteArray.Length);    
                   cStream.FlushFinalBlock();    
                   return Convert.ToBase64String(mStream.ToArray());    
           }
//DES加密
public static string DESEncode(string encryptString, string encryptKey) {
        byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
        byte[] rgbIV = DESKeys;
        byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
        DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
        MemoryStream mStream = new MemoryStream();
        CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV),
        CryptoStreamMode.Write);
        cStream.Write(inputByteArray, 0, inputByteArray.Length);
            cStream.FlushFinalBlock();
            return Convert.ToBase64String(mStream.ToArray());
    }