using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Globalization;

namespace MMO
{
    public static class MMOEncrypt
    {
        #region AES
        public const string Key = "toukagameqwertyu";
        public const string IV = "1012132405963708";

        public static string AESEncrypt(string plainText)
        {
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");

            byte[] encrypted;
            using (Aes aesAlg = Aes.Create())
            {
                aesAlg.Key = Encoding.ASCII.GetBytes(Key);
                aesAlg.IV = Encoding.ASCII.GetBytes(IV);
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
                using (MemoryStream msEncrypt = new MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt, Encoding.UTF8))
                        {
                            swEncrypt.Write(plainText);
                        }
                        encrypted = msEncrypt.ToArray();
                    }
                }
            }
            return Convert.ToBase64String(encrypted);
        }

        public static string AESDecrypt(string cipherStr)
        {
            var cipherText = Convert.FromBase64String(cipherStr);
            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("IV");

            string plaintext = null;
            using (Aes aesAlg = Aes.Create())
            {
                aesAlg.Key = Encoding.ASCII.GetBytes(Key);
                aesAlg.IV = Encoding.ASCII.GetBytes(IV);
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt, Encoding.UTF8))
                        {
                            plaintext = srDecrypt.ReadToEnd();
                        }
                    }
                }
            }
            return plaintext;
        }
        #endregion

        #region MD5
        public const string MD5KEY = "mooncake";
        // 创建Key
        public static string GenerateKey()
        {
            DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
            return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
        }

        // 加密字符串
        public static string MD5Encrypt(string pOriginal)
        {
            byte[] data = Encoding.UTF8.GetBytes(pOriginal);
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            DES.Key = ASCIIEncoding.ASCII.GetBytes(MD5KEY);
            DES.IV = ASCIIEncoding.ASCII.GetBytes(MD5KEY);
            ICryptoTransform desencrypt = DES.CreateEncryptor();
            byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
            return BitConverter.ToString(result);
        }

        // 解密字符串
        public static string MD5Decrypt(string pOriginal)
        {
            string[] sInput = pOriginal.Split("-".ToCharArray());
            byte[] data = new byte[sInput.Length];
            for (int i = 0; i < sInput.Length; i++)
            {
                data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
            }
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            DES.Key = ASCIIEncoding.ASCII.GetBytes(MD5KEY);
            DES.IV = ASCIIEncoding.ASCII.GetBytes(MD5KEY);
            ICryptoTransform desencrypt = DES.CreateDecryptor();
            byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
            return Encoding.UTF8.GetString(result);
        }
        #endregion
    }
}