MD5加密和DES加密/解密

MD5加密和DES加密/解密

MD5加密

 #region
        /// <summary>
        /// MD5加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string MD5Encrypt(string str)
        {
            str += "?><Inlett";
            StringBuilder builder = new StringBuilder();
            //using作用设置这个md5对象在之后的花括号中使用时绝对不会丢失
            using (MD5 md5 = MD5.Create())
            {
                byte[] data=md5.ComputeHash(Encoding.UTF8.GetBytes(str));
                foreach (byte item in data)
                {
                    builder.Append(item.ToString("X2"));
                }
            }
            return builder.ToString();
        }
        #endregion

DES加密/解密

 #region//DES加密/解密
        /// <summary>
        /// 密钥
        /// </summary>
        static byte[] key = Encoding.UTF8.GetBytes("InLettkj");
        /// <summary>
        /// 加密向量
        /// </summary>
        static byte[] iv = Encoding.UTF8.GetBytes("89564386");

        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DESEncrypt(string str)
        {
            //临时容器
            MemoryStream ms = null;
            //普通数据和加密数据的转换流
            CryptoStream cs = null;
            StreamWriter sw = null;
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                ms = new MemoryStream();
                cs = new CryptoStream(ms,des.CreateEncryptor(key,iv), CryptoStreamMode.Write);
                sw = new StreamWriter(cs);
                sw.Write(str);
                sw.Flush();
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
            }
            finally
            {
                if (sw!=null)
                {
                    sw.Close();
                }
                if (cs!=null)
                {
                    cs.Close();
                }
                if (ms!=null)
                {
                    ms.Close();
                }
            }
        }
        /// <summary>
        /// DES解密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DESDecrypt(string str)
        {
            //临时容器
            MemoryStream ms = null;
            //普通数据和加密数据的转换流
            CryptoStream cs = null;
            StreamReader sw = null;

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                byte[] data = Convert.FromBase64String(str);
                ms = new MemoryStream(data);
                cs = new CryptoStream(ms,des.CreateDecryptor(key,iv), CryptoStreamMode.Read);
                sw = new StreamReader(cs);
                return sw.ReadToEnd();
            }
            finally
            {
                if (sw!=null)
                {
                    sw.Close();
                }
                if (cs!=null)
                {
                    cs.Close();
                }
                if (ms!=null)
                {
                    ms.Close();
                }
            }
        }
        #endregion