c#語言的加密與解密

簡介：c#語言的加密與解密,主要是針對字符串的加密與解密操作

             核心操作就是把字符串變成二進制,將二進制數據編碼為base 64 數字

             轉換成等效的8 位無符號整數數組,轉換成UTF-8等操作之間的相互轉換

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加密操作：

        /// <summary>
        /// 加密
         /// </summary>
        /// <param name="strText">要加密字符</param>
        /// <param name="strEncrKey">編碼</param>
        /// <returns>返回加密后字符串</returns>
        /// <author>PengZhen</author>
        /// <time>2012年1月4日10:10:55</time>
        public static string DesEncrypt(string strText, string strEncrKey)
        {
            byte[] byKey = null;
            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, strEncrKey.Length));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());

            }
            catch (System.Exception error)
            {
                return "error:" + error.Message + "";
            }
        }

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解密操作：

        /// <summary>
        /// 解密
         /// </summary>
        /// <param name="strText">要解密字符</param>
        /// <param name="sDecrKey">編碼</param>
        /// <returns>返回加密后字符串</returns>
        /// <author>PengZhen</author>
        /// <time>2012年1月4日10:11:06</time>
        public static string DesDecrypt(string strText, string sDecrKey)
        {
            byte[] byKey = null;
            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            byte[] inputByteArray = new Byte[strText.Length];
            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Convert.FromBase64String(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                System.Text.Encoding encoding = new System.Text.UTF8Encoding();
                return encoding.GetString(ms.ToArray());
            }
            catch (System.Exception error)
            {
                return "error:" + error.Message + "";
            }
        }

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調用代碼：

            Console.WriteLine("需要加密的字符串：123456");
            Console.WriteLine("加密、解密的密碼：password");

            string strDesEncrypt=DesEncrypt("123456", "password");
            Console.WriteLine("加密后的字符串："+strDesEncrypt);

            string strDesDecrypt = DesDecrypt(strDesEncrypt, "password");
            Console.WriteLine("解密后的字符串：" + strDesDecrypt);
            Console.ReadLine();

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來自：http://blog.csdn.net/pengzhen8805/article/details/14059167