/// <summary>
??? /// MD5加密解密幫助類
??? /// </summary>
??? public static class DESHelper
??? {
??????? /// <summary>
??????? /// MD5加密
??????? /// </summary>
??????? /// <param name="pToEncrypt"></param>
??????? /// <param name="sKey">密鑰(8位字符)</param>
??????? /// <returns></returns>
??????? public static string MD5Encrypt(string pToEncrypt, string sKey)
??????? {
??????????? 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, 0, inputByteArray.Length);
??????????? cs.FlushFinalBlock();
??????????? StringBuilder ret = new StringBuilder();
??????????? foreach (byte b in ms.ToArray())
??????????? {
??????????????? ret.AppendFormat("{0:X2}", b);
??????????? }
??????????? ret.ToString();
??????????? return ret.ToString();
??????? }
??????? /// <summary>
??????? /// MD5解密
??????? /// </summary>
??????? /// <param name="pToDecrypt"></param>
??????? /// <param name="sKey">密鑰(8位字符)</param>
??????? /// <returns></returns>
??????? public static string MD5Decrypt(string pToDecrypt, string sKey)
??????? {
??????????? DESCryptoServiceProvider des = new DESCryptoServiceProvider();
??????????? byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
??????????? for (int x = 0; x < pToDecrypt.Length / 2; x++)
??????????? {
??????????????? int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
??????????????? inputByteArray[x] = (byte)i;
??????????? }
??????????? des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
??????????? des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
??????????? MemoryStream ms = new MemoryStream();
??????????? CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
??????????? cs.Write(inputByteArray, 0, inputByteArray.Length);
??????????? cs.FlushFinalBlock();
??????????? StringBuilder ret = new StringBuilder();
??????????? return System.Text.Encoding.Default.GetString(ms.ToArray());
??????? }
??????? /// <summary>
??????? /// 獲取Key
??????? /// </summary>
??????? /// <returns></returns>
??????? public static string GetKey()
??????? {
??????????? return "wanghuai";
??????? }
??? }

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