java、C#配套版AES加密

java版加密：

public static String aesEncrypt(String str, String key) throws Exception {
        if (str == null || key == null) return null;
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(Md5Utils.ShortMd5(key).getBytes("UTF-8"), "AES"));
        byte[] bytes = cipher.doFinal(str.getBytes("utf-8"));
        return new BASE64Encoder().encode(bytes);
    }

java版解密：

public static String aesDecrypt(String str, String key) throws Exception {
        if (str == null || key == null) return null;
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(Md5Utils.ShortMd5(key).getBytes("UTF-8"), "AES"));
        byte[] bytes = new BASE64Decoder().decodeBuffer(str);
        bytes = cipher.doFinal(bytes);
        return new String(bytes, "utf-8");
    }

C#版加密：

public static string Encrypt(string toEncrypt,string key)
    {
        // 256-AES key    
        //byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
        byte[] keyArray = Encoding.UTF8.GetBytes(Get16ByteMd5(key));
        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

        RijndaelManaged rDel = new RijndaelManaged();
        rDel.Key = keyArray; 
        rDel.Mode = CipherMode.ECB;
        rDel.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = rDel.CreateEncryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        return Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }

C#版解密：

public static string Decrypt(string toDecrypt,string key)
    {
        // 256-AES key    
        //byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
        byte[] keyArray = Encoding.UTF8.GetBytes(Get16ByteMd5(key));
        byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);

        RijndaelManaged rDel = new RijndaelManaged();
        rDel.Key = keyArray;
        rDel.Mode = CipherMode.ECB;
        rDel.Padding = PaddingMode.PKCS7;
        //rDel.IV = IV;

        ICryptoTransform cTransform = rDel.CreateDecryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        return UTF8Encoding.UTF8.GetString(resultArray);
    }

java版用到的代码：

public static String ShortMd5(String sourceStr)
    {
        String result = "";
        try
        {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++)
            {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString().substring(8, 24);
        }
        catch (NoSuchAlgorithmException e)
        {
            System.out.println(e);
        }
        return result.toUpperCase();
    }

C#版用到的代码：

 public static string Get16ByteMd5(string ConvertString)
    {
        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
        string t2 = BitConverter.ToString(md5.ComputeHash(Encoding.UTF8.GetBytes(ConvertString)), 4, 8);
        t2 = t2.Replace("-", "");
        return t2.ToUpper();
    }

来自为知笔记(Wiz)