学步园

using System;<br /> using System.IO;<br /> using System.Security.Cryptography;<br /> using System.Text;<br /> namespace DataCrypto<br /> {</p> <p> //hash<span class='wp_keywordlink'><a href="http://www.xuebuyuan.com/category/%E7%AE%97%E6%B3%95" title="算法" target="_blank">算法</a></span>是不可逆的 ，主要存放密码是加密，然后与 用户登陆是 填写的密码加密后 对比<br /> //加密方法是可逆的，有解密算法</p> <p> //*****************************************************hash算法**********************************<br /> /// <summary><br /> ///HashMethod 的摘要说明<br /> /// </summary><br /> public class HashMethod<br /> {<br /> private HashAlgorithm HashCryptoService;<br /> /// <summary><br /> /// 哈希加密类的构造函数<br /> /// </summary><br /> public HashMethod()<br /> {<br /> HashCryptoService = new SHA1Managed();<br /> }<br /> /// <summary><br /> /// 加密方法<br /> /// </summary><br /> /// <param name="Source">待加密的串</param><br /> /// <returns>经过加密的串</returns><br /> public string HashiEncrypto(string Source)<br /> {<br /> byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);<br /> byte[] bytOut = HashCryptoService.ComputeHash(bytIn);<br /> return Convert.ToBase64String(bytOut);<br /> }</p> <p> }<br /> //*****************************************************加密解密**********************************</p> <p> /// <summary><br /> ///SymmetricMethod 的摘要说明<br /> /// </summary><br /> public class SymmetricMethod<br /> {<br /> private SymmetricAlgorithm mobjCryptoService;<br /> private string Key;<br /> /// <summary><br /> /// 对称加密类的构造函数<br /> /// </summary><br /> public SymmetricMethod()<br /> {<br /> mobjCryptoService = new RijndaelManaged();<br /> Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";<br /> }<br /> /// <summary><br /> /// 获得密钥<br /> /// </summary><br /> /// <returns>密钥</returns><br /> private byte[] GetLegalKey()<br /> {<br /> string sTemp = Key;<br /> mobjCryptoService.GenerateKey();<br /> byte[] bytTemp = mobjCryptoService.Key;<br /> int KeyLength = bytTemp.Length;<br /> if (sTemp.Length > KeyLength)<br /> sTemp = sTemp.Substring(0, KeyLength);<br /> else if (sTemp.Length < KeyLength)<br /> sTemp = sTemp.PadRight(KeyLength, ' ');<br /> return ASCIIEncoding.ASCII.GetBytes(sTemp);<br /> }<br /> /// <summary><br /> /// 获得初始向量IV<br /> /// </summary><br /> /// <returns>初试向量IV</returns><br /> private byte[] GetLegalIV()<br /> {<br /> string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";<br /> mobjCryptoService.GenerateIV();<br /> byte[] bytTemp = mobjCryptoService.IV;<br /> int IVLength = bytTemp.Length;<br /> if (sTemp.Length > IVLength)<br /> sTemp = sTemp.Substring(0, IVLength);<br /> else if (sTemp.Length < IVLength)<br /> sTemp = sTemp.PadRight(IVLength, ' ');<br /> return ASCIIEncoding.ASCII.GetBytes(sTemp);<br /> }<br /> /// <summary><br /> /// 加密方法<br /> /// </summary><br /> /// <param name="Source">待加密的串</param><br /> /// <returns>经过加密的串</returns><br /> public string Encrypto(string Source)<br /> {<br /> byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);<br /> MemoryStream ms = new MemoryStream();<br /> mobjCryptoService.Key = GetLegalKey();<br /> mobjCryptoService.IV = GetLegalIV();<br /> ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();<br /> CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);<br /> cs.Write(bytIn, 0, bytIn.Length);<br /> cs.FlushFinalBlock();<br /> ms.Close();<br /> byte[] bytOut = ms.ToArray();<br /> return Convert.ToBase64String(bytOut);<br /> }<br /> /// <summary><br /> /// 解密方法<br /> /// </summary><br /> /// <param name="Source">待解密的串</param><br /> /// <returns>经过解密的串</returns><br /> public string Decrypto(string Source)<br /> {<br /> byte[] bytIn = Convert.FromBase64String(Source);<br /> MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);<br /> mobjCryptoService.Key = GetLegalKey();<br /> mobjCryptoService.IV = GetLegalIV();<br /> ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();<br /> CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);<br /> StreamReader sr = new StreamReader(cs);<br /> return sr.ReadToEnd();<br /> }</p> <p> }<br /> }<br />