Implementation Code of md5 encryption in asp.net

This article introduces the implementation of md5 encryption, which also includes SQL anti-injection code. If you need it, you can refer to it.

The Code is as follows:

Copy code

Public class FormatStr { # Region MD5 Encryption /// <Summary> /// MD5 Encryption /// </Summary> /// <Param name = "str"> encrypted string </param> /// <Returns> </returns> Public static string MD5 (string str ){ Return System. Web. Security. FormsAuthentication. HashPasswordForStoringInConfigFile (str, "MD5 "); } # Endregion # Region remove HTML tags /// <Summary> /// Remove HTML tags /// </Summary> /// <Param name = "NoHTML"> including the source code of HTML </param> /// <Returns> removed text </returns> Public static string NoHTML (string Htmlstring) { // Delete the script Htmlstring = Regex. Replace (Htmlstring, @ "<script [^>] *?>. *? </Script> "," ", RegexOptions. IgnoreCase ); // Delete HTML Htmlstring = Regex. Replace (Htmlstring, @ "<(. [^>] *)>", "", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "([rn]) [s] +", "", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "-->", "", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "<! --. * "," ", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (quot | #34);", "", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (amp | #38);", "&", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (lt | #60);", "<", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (gt | #62);", ">", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (nbsp | #160);", "", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (iexcl | #161);", "xa1", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (cent | #162);", "xa2", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (pound | #163);", "xa3", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& (copy | #169);", "xa9", RegexOptions. IgnoreCase ); Htmlstring = Regex. Replace (Htmlstring, @ "& # (d +);", "", RegexOptions. IgnoreCase ); Htmlstring. Replace ("<",""); Htmlstring. Replace ("> ",""); Htmlstring. Replace ("rn ",""); Htmlstring = HttpContext. Current. Server. HtmlEncode (Htmlstring). Trim (); Return Htmlstring; } # Endregion # Region Remove invalid strings /// <Summary> /// Remove invalid strings /// </Summary> /// <Param name = "strChar"> original string </param> /// <Returns> filtered strings </returns> Public static string ReplaceBadChar (string strChar) { If (strChar. Trim () = "") { Return ""; } Else { StrChar = strChar. Replace ("'",""); StrChar = strChar. Replace ("*",""); StrChar = strChar. Replace ("? ",""); StrChar = strChar. Replace ("(",""); StrChar = strChar. Replace (")",""); StrChar = strChar. Replace ("<",""); StrChar = strChar. Replace ("= ",""); Return strChar. Trim (); } } # Endregion # Check whether region is a number /// <Summary> /// Check whether all items are numbers /// </Summary> /// <Param name = "str"> string to be checked </param> /// <Returns> bool </returns> Public static bool IsNumeric (string str) { Regex reg = new Regex (@ "^ [+]? D * $ "); Return reg. IsMatch (str ); } # Endregion # Check whether the Email format is correct for region /// <Summary> /// Check whether the Email format is correct /// </Summary> /// <Param name = "str"> string to be checked </param> /// <Returns> bool </returns> Public static bool IsEmail (string str) { Regex reg = new Regex (@ "^ ([w-.] +) @ ([0-9] {1, 3 }. [0-9] {1, 3 }. [0-9] {1, 3 }.) | ([w-] + .) +) ([a-zA-Z] {2, 4} | [0-9] {1, 3}) (]?) $ "); Return reg. IsMatch (str ); } # Endregion # Check whether the date format is correct for region /// <Summary> /// Check whether the date format is correct /// </Summary> /// <Param name = "str"> string to be checked </param> /// <Returns> bool </returns> Public static bool IsDate (string str) { // Take into account the 366 day of the 4-year period, and there is a special February date Regex reg = new Regex (@ "^ (1 [6-9] | [2-9] d) d {2})-(0? [1, 13578] | 1 [02])-(0? [1-9] | [12] d | 3 [01]) | (1 [6-9] | [2-9] d) d {2 }) -(0? [13456789] | 1 [012])-(0? [1-9] | [12] d | 30) | (1 [6-9] | [2-9] d) d {2})-0? 2-(0? [1-9] | 1d | 2 [0-8]) | (1 [6-9] | [2-9] d) (0 [48] | [2468] [048] | [13579] [26]) | (16 | [2468] [048] | [3579] [26]) 00)-0? 2-29-) (20 | 21 | 22 | 23 | [0-1]? D): [0-5]? D: [0-5]? D $ "); Return reg. IsMatch (str ); } # Endregion # Region HTML conversion to a string /// <Summary> /// Convert HTML to a string and the conversion identifier /// </Summary> /// <Param name = "str"> </param> /// <Returns> </returns> Public static string htmToStr (string str) { Return str. replace ("'", "mySQ ;"). replace ("", "myDQ ;"). replace ("<", "myLt ;"). replace (">", "myGt ;"). replace ("-", "myMl ;"). replace ("_", "myBl ;"). replace ("%", "myBs ;"). replace ("? "," MyQe; "). Replace (" * "," myAl ;"); } # Endregion # Region String Conversion to HTML /// <Summary> /// Convert the string to HTML and restore the ID /// </Summary> /// <Param name = "str"> </param> /// <Returns> </returns> Public static string strToHtm (string str) { If (str = null) return ""; Return str. replace ("mySQ ;","'"). replace ("myDQ ;","""). replace ("myLt;", "<"). replace ("myGt;", "> "). replace ("myMl ;","-"). replace ("myBl ;","_"). replace ("myBs;", "% "). replace ("myQe ;","? "). Replace (" myAl ;","*"); } # Endregion # Convert region text to HTML /// <Summary> /// Convert text to HTML, replace (n) /// </Summary> /// <Param name = "str"> </param> /// <Returns> </returns> Public static string textToHtm (string str) { Return str. replace ("t ",""). replace ("<", "<"). replace (">", "> "). replace ("",""). replace ("rn", "<br> "). replace ("n", "<br> "); } # Endregion # Convert region text to input box content /// <Summary> /// Convert the text into the content of the input box, /// </Summary> /// <Param name = "str"> </param> /// <Returns> </returns> Public static string HtmToInputValue (string str) { // Return str. replace ("<", "<"). replace (">", "> "). replace (""","""). replace ("&","&"); Return str. Replace (""","""); } # Endregion # Region protection against SQL injection attacks /// <Summary> /// Prevents SQL injection attacks /// </Summary> /// <Param name = "strQueryName"> </param> /// <Returns> </returns> Public static string getQueryString (string strQueryName) { // (') (--) (Or) (=) System. Web. HttpRequest myRequest = System. Web. HttpContext. Current. Request; String str1 = myRequest. QueryString [strQueryName]; If (str1 = null) return ""; Str1 = str1.Replace ("'","'"). replace ("--","-"). replace ("=", "= "). replace ("or", "o r "). replace ("Or", "O r "). replace ("OR", "o r "). replace ("oR", "o R "). replace (">", "> ","〉"). replace ("<", "<","〈"); Return str1; } # Endregion # Region protection against SQL injection attacks /// <Summary> /// Prevents SQL injection attacks /// </Summary> /// <Param name = "strQueryName"> </param> /// <Returns> </returns> Public static string getSQLString (string strQueryName) { If (strQueryName = null) return ""; StrQueryName = strQueryName. replace ("'","'"). replace ("--","-"). replace ("=", "= "). replace ("or", "o r "). replace ("Or", "O r "). replace ("OR", "o r "). replace ("oR", "o R "). replace (">", "> ","〉"). replace ("<", "<","〈"); Return strQueryName; } # Endregion }