DES加密解决算法

 　　　　/// <summary>
        /// DES加密算法
        /// sKey为8位或16位
        /// </summary>
        /// <param name="pToEncrypt">需要加密的字符串</param>
        /// <param name="sKey">密钥</param>
        /// <returns></returns>
        public static string DesEncryptStr(string pToEncrypt, string sKey)
        {
            StringBuilder ret = new StringBuilder();

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, , inputByteArray.Length);
                cs.FlushFinalBlock();

                foreach (byte b in ms.ToArray())
                {
                    ret.AppendFormat("{0:X2}", b);
                }
                ret.ToString();

            return ret.ToString();
            //return a;
        }
        /// <summary>
        /// DES解密算法
        /// sKey为8位或16位
        /// </summary>
        /// <param name="pToDecrypt">需要解密的字符串</param>
        /// <param name="sKey">密钥</param>
        /// <returns></returns>
        public static string DesDecryptStr(string pToDecrypt, string sKey)
        {
            MemoryStream ms = new MemoryStream();

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = new byte[pToDecrypt.Length / ];
                for (int x = ; x < pToDecrypt.Length / ; x++)
                {
                    int i = (Convert.ToInt32(pToDecrypt.Substring(x * , ), ));
                    inputByteArray[x] = (byte)i;
                }
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, , inputByteArray.Length);
                cs.FlushFinalBlock();
                StringBuilder ret = new StringBuilder();

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }