OL.FrameCore.Infrastructure/Security/MD5Utility.cs

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using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;

namespace OL.FrameCore.Infrastructure.Security
{
    public class MD5Utility
    {
        const string EncryptKey = "u3%s~0o!";

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="decryptString">要加密的文本</param>
        /// <param name="encryptKey">秘钥</param>
        /// <returns></returns>
        public static string Encrypt(string decryptString, string encryptKey = EncryptKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(decryptString);
            des.Key = ASCIIEncoding.ASCII.GetBytes(Md5Hash(encryptKey).Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(Md5Hash(encryptKey).Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.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);
            }
            return ret.ToString();
        }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="decryptString"></param>
        /// <param name="encryptKey"></param>
        /// <returns></returns>
        public static string Decrypt(string decryptString, string encryptKey = EncryptKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = decryptString.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(decryptString.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(Md5Hash(encryptKey).Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(Md5Hash(encryptKey).Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();