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()); 
	}