AES和MD5密码的算法代码,CSharp代码库,德仔网

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【CSharp】 AES和MD5密码的算法
作者:dezai / 发布于2014/1/26/ 328
using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace Anshield_AutoFutures.BaseClase
{
 class AES_Function
 {
 static readonly string encryptKey = "SHILEDAN";
 #region DES加密解密类
 private static byte[] keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

 /// <summary>
 /// DES加密字符串
 /// </summary>
 /// <param name="encryptString">待加密的字符串</param>
 /// <param name="encryptKey">加密密钥,要求为8位 可随意定制 必须与解密的encryptKey相同</param>
 /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
 public static string EncryptDES(string encryptString)
 {
 try
 {
 byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
 byte[] rgbIV = keys;
 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
 DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
 MemoryStream mStream = new MemoryStream();
 CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
 cStream.Write(inputByteArray, 0, inputByteArray.Length);
 cStream.FlushFinalBlock();
 return Convert.ToBase64String(mStream.ToArray());
 }
 catch
 {
 return encryptString;
 }
 }

 /// <summary>
 /// DES解密字符串
 /// </summary>
 /// <param name="decryptString">待解密的字符串</param>
 /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
 /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
 public static string DecryptDES(string decryptString)
 {
 try
 {
 byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey);
 byte[] rgbIV = keys;
 byte[] inputByteArray = Convert.FromBase64String(decryptString);
 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
 MemoryStream mStream = new MemoryStream();
 CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
 cStream.Write(inputByteArray, 0, inputByteArray.Length);
 cStream.FlushFinalBlock();
 return Encoding.UTF8.GetString(mStream.ToArray());
 }
 catch
 {
 return decryptString;
 }
 }
 /**/
 /// <summary>
 /// MD5　32位加密
 /// </summary>
 /// <param name="str"></param>
 /// <returns></returns>
 public static string UserMd5(string str)
 {
 string cl = str;
 string pwd = "";
 MD5 md5 = MD5.Create();//实例化一个md5对像
 // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择
 byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));
 // 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得
 for (int i = 0; i < s.Length; i++)
 {
 // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符

 pwd = pwd + s[i].ToString("X");

 }
 return pwd;
 }
 #endregion
 }
}
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