Hash string in c

Question

I have a problem when trying get a hash string in c    I already tried a few websites  but most of them are using files to get the hash  Others that are for strings are a bit too complex  I found examples for Windows authentication for web like this   FormsAuthentication HashPasswordForStoringInConfigFile tbxPassword Text Trim     md5     I need to use a hash to make a string that contains a filename more secure  How can I do that   Example   string file     username   string hash          username      Should I use another hashing algorithm and not  md5

User · Answer

I think what you re looking for is not hashing but encryption  With hashing  you will not be able to retrieve the original filename from the  hash  variable  With encryption you can  and it is secure   See AES in ASP NET with VB NET for more information about encryption in  NET

User · Answer

I don t really understand the full scope of your question  but if all you need is a hash of the string  then it s very easy to get that   Just use the GetHashCode method   Like this   string hash   username GetHashCode

User · Answer

using System Security Cryptography   public static byte   GetHash string inputString        using  HashAlgorithm algorithm   SHA256 Create            return algorithm ComputeHash Encoding UTF8 GetBytes inputString       public static string GetHashString string inputString        StringBuilder sb   new StringBuilder        foreach  byte b in GetHash inputString           sb Append b ToString  X2          return sb ToString        Additional Notes   Since MD5 and SHA1 are obsolete and insecure algorithms  this solution uses SHA256  Alternatively  you can use BCrypt or Scrypt as pointed out in comments  Also  consider  salting  your hashes and use proven cryptographic algorithms  as pointed out in comments

User · Answer

The fastest way  to get a hash string for password store purposes  is a following code       internal static string GetStringSha256Hash string text                if  String IsNullOrEmpty text               return String Empty           using  var sha   new System Security Cryptography SHA256Managed                          byte   textData   System Text Encoding UTF8 GetBytes text               byte   hash   sha ComputeHash textData               return BitConverter ToString hash  Replace  -   String Empty                     Remarks    if the method is invoked often  the creation of sha variable should be refactored into a class field  output is presented as encoded hex string

User · Answer

Secure  amp  Encrypte Data     public static string HashSHA1 string value                var sha1   SHA1 Create            var inputBytes   Encoding ASCII GetBytes value           var hash   sha1 ComputeHash inputBytes           var sb   new StringBuilder            for  var i   0  i  lt  hash Length  i                          sb Append hash i  ToString  X2                       return sb ToString

User · Answer

If performance is not a major concern  you can also use any of these methods   In case you wanted the hash string to be in upper case  replace  x2  with  X2     public static string SHA256ToString string s         using  var alg   SHA256 Create            return string Join null  alg ComputeHash Encoding UTF8 GetBytes s   Select x   gt  x ToString  x2          or   public static string SHA256ToString string s                    using  var alg   SHA256 Create            return alg ComputeHash Encoding UTF8 GetBytes s   Aggregate new StringBuilder     sb  x    gt  sb Append x ToString  x2     ToString

User · Answer

The shortest and fastest way ever  Only 1 line       public static string StringSha256Hash string text    gt          string IsNullOrEmpty text    string Empty   BitConverter ToString new System Security Cryptography SHA256Managed   ComputeHash System Text Encoding UTF8 GetBytes text    Replace  -   string Empty

[c#] Hash string in c#

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