MD5加密解密类(asp.net)&使用MD5过时处理
加密类
#region ========加密========/// /// 加密/// /// /// public static string Encrypt(string Text){ return Encrypt(Text, "cong");}/// /// 加密数据 /// /// /// /// public static string Encrypt(string Text, string sKey){ DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray; inputByteArray = Encoding.Default.GetBytes(Text); des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").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();}#endregion#region ========解密========/// /// 解密/// /// /// public static string Decrypt(string Text){ return Decrypt(Text, "cong");}/// /// 解密数据 /// /// /// /// public static string Decrypt(string Text, string sKey){ DESCryptoServiceProvider des = new DESCryptoServiceProvider(); int len; len = Text.Length / 2; byte[] inputByteArray = new byte[len]; int x, i; for (x = 0; x < len; x++) { i = Convert.ToInt32(Text.Substring(x * 2, 2), 16); inputByteArray[x] = (byte)i; } des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").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(); return Encoding.Default.GetString(ms.ToArray());}#endregion
在.net 4.5版本下,使用System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile进行MD5加密时,会出现已过时,如下图:
MD5加密过时显示.png
我们可以用下面的方法替代之:
命名空间:System.Web.Security程序集:System.Web(在 system.web.dll 中)
/// /// 32位MD5加密/// /// /// private static string Md5Hash(string input){MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));StringBuilder sBuilder = new StringBuilder();for (int i = 0; i < data.Length; i++){ sBuilder.Append(data[i].ToString("x2"));}return sBuilder.ToString();}
本来我也以为System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile中的MD5和常用的一样
可今天一试,结果有很大不同, 比如test,HashPasswordForStoringInConfigFile编码成 C8059E2EC7419F590E79D7F1B774BFE6 而应该是098f6bcd4621d373cade4e832627b4f6
而且不同的机器不同的结果,有些结果正确 一看MSDN的解释,原来是 Given a password and a string identifying the hash type, this routine produces a hash password suitable for storing in a configuration file.
为了和以前的代码兼容和平台兼容,只好自己重新写了MD5的算法,利用System.Security.Cryptography.MD5CryptoServiceProvider 代码如下,大家执行一下就知道了,我就不多说了。
<script language="C#" runat="server"> string qswhMD5(string str){ /************qiushuiwuhen(2002-9-27)***************/ byte[] b=System.Text.Encoding.Default.GetBytes(str); b=new System.Security.Cryptography.MD5CryptoServiceProvider().ComputeHash(b); string ret=""; for(int i=0;i<b.Length;i++) ret+=b[i].ToString("x").PadLeft(2,'0'); return ret; } public void encryptString(Object sender, EventArgs e) { myMD5.Text=qswhMD5(txtClear.Text); MD5.Text =System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(txtClear.Text, "MD5") ; } </script> <body onload=document.all.txtClear.select();> <form runat="server"> 明文:<asp:Textbox id="txtClear" runat="server" /> <asp:Button runat="server" text="Md5摘要" onClick="encryptString" ID="Button1" /> <br/>通常用的 MD5: <br/><asp:label id="myMD5" runat="server" /> <br/> <br/>HashPasswordForStoringInConfigFile中的 MD5: <br/><asp:label id="MD5" runat="server" /> </form>
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