幾種加解密方法：AES、DES、SHA數據加密

一般項目都會用上加密，剛好手上的項目就用到DES加密，就貼一些代碼記錄一下

DES加密步奏：

1.初始化兩個字符串，一個為指定的秘鑰，一個為初始化向量，要求是8個字符。

2.加密：秘鑰、向量、需加密的字符串傳換成byte[]類型；

           聲明加密標准類，DESCryptoServiceProvider

   　　  創建內存流，MemoryStream

           創建將數據流鏈接到加密轉換的流，CryptoStream

           將需加密的字符串寫入當前加密對象

           講緩沖區的當前狀態更新基礎數據

           將基礎數據轉換成64位等效字符返回

3.解密：方法同上

public class Encrypt
    {
        private static string key = "^&_C*2s#";
        private static string iv = "*-d&js50";
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串
        /// <param name="encryptKey">加密密鑰,要求為8位
        /// <returns>加密成功返回加密后的字符串，失敗返回源串</returns>
        public static string DesEncrypt(string encryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(key);
                byte[] rgbIV = Encoding.UTF8.GetBytes(iv);
                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());
            }
            catch
            {
                return encryptString;
            }
        }

        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串
        /// <param name="decryptKey">解密密鑰,要求為8位,和加密密鑰相同
        /// <returns>解密成功返回解密后的字符串，失敗返源串</returns>
        public static string DesDecrypt(string decryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(key);
                byte[] rgbIV = Encoding.UTF8.GetBytes(iv);
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }
    }