本文实例讲述了asp.net实现的MD5加密和DES加解密算法类。分享给大家供大家参考，具体如下：

#region MD5算法public string md5(string str, int code){if (code == 32) //32位加密{return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();}else //16位MD5加密（取32位加密的9~25字符）{return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16);}}#endregion#region DESEncrypt DES加密// <summary>/// 进行DES加密。/// </summary>/// <param name=”pToEncrypt”>要加密的字符串。</param>/// <param name=”sKey”>密钥，且必须为8位。</param>/// <returns>以Base64格式返回的加密字符串。</returns>public string DESEncrypt(string pToEncrypt, string sKey){using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()){byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);System.IO.MemoryStream ms = new System.IO.MemoryStream();using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)){cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();cs.Close();}string str = Convert.ToBase64String(ms.ToArray());ms.Close();return str;}}#endregion#region DESDecrypt DES解密/// <summary>/// 进行DES解密。/// </summary>/// <param name=”pToDecrypt”>要解密的以Base64</param>/// <param name=”sKey”>密钥，且必须为8位。</param>/// <returns>已解密的字符串。</returns>public string DESDecrypt(string pToDecrypt, string sKey){byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()){des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);System.IO.MemoryStream ms = new System.IO.MemoryStream();using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)){cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();cs.Close();}string str = Encoding.UTF8.GetString(ms.ToArray());ms.Close();return str;}}#endregion

PS：关于加密解密感兴趣的朋友还可以参考本站在线工具：

密码安全性在线检测：
http://tools.jb51.net/password/my_password_safe

高强度密码生成器：
http://tools.jb51.net/password/CreateStrongPassword

MD5在线加密工具：
http://tools.jb51.net/password/CreateMD5Password

迅雷、快车、旋风URL加密/解密工具：
http://tools.jb51.net/password/urlrethunder

在线散列/哈希算法加密工具：
http://tools.jb51.net/password/hash_encrypt

更多关于asp.net相关内容感兴趣的读者可查看本站专题：《asp.net操作json技巧总结》、《asp.net字符串操作技巧汇总》、《asp.net操作XML技巧总结》、《asp.net文件操作技巧汇总》、《asp.net ajax技巧总结专题》及《asp.net缓存操作技巧总结》。

希望本文所述对大家asp.net程序设计有所帮助。