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Short hash function names

Discussion in 'Delphi Programming' started by AdminDF, Mar 5, 2014.

  1. AdminDF
    Online

    AdminDFAdminDF is a Verified Member DelphiFan Administrator Staff Member DF Staff

    If you ever tried to use MD5 or SHA hash function came with Indy library, especially when you want to make a cross platform application using FireMonkey. You are pretty much HIDE-THANKSed to Indy, there may be many other better options, I only found Indy to be cross platform so far.

    In Indy, to get a MD5 from a string, you need to do:


    Code:
    with TIdHashMessageDigest5.Create do
    begin
    Result := HashStringAsHex(S);
    Free;
    end;
    

    Not too complicated, but it become obvious to create a wrapper function if you have lots of places needs md5 hashes.

    So it becomes


    Code:
    function MD5(S: String): String;
    begin
    with TIdHashMessageDigest5.Create do
    begin
    Result := HashStringAsHex(S);
    Free;
    end;
    end;
    
    lMd5 = MD5('string to hash');
    


    Code:
    unit hashutil;
     
    interface
     
    uses SysUtils, Classes, IdGlobal, IdHash, IdHashMessageDigest, IdHashSHA, IdHashCRC;
     
    function MD5(S: String): String; overload;
    function MD5(S: TStream): String; overload;
    function MD5_Bytes(S: String): TIdBytes;
    function MD5_File(AFilename: String): String;
     
    implementation
     
     
    function MD5_File(AFilename: String): String;
    var
      fs: TFileStream;
    begin
      with TIdHashMessageDigest5.Create do
      begin
        fs := TFileStream.Create(AFilename, fmOpenRead);
        try
          Result := HashStreamAsHex(fs);
        finally
          fs.Free;
        end;
        Free;
      end;
    end;
     
    function MD5_Bytes(S: String): TIdBytes;
    begin
      with TIdHashMessageDigest5.Create do
      begin
        Result := HashString(S);
        Free;
      end;
    end;
     
    function MD5(S: String): String;
    begin
      with TIdHashMessageDigest5.Create do
      begin
        Result := HashStringAsHex(S);
        Free;
      end;
    end;
     
    function MD5(S: TStream): String;
    begin
      with TIdHashMessageDigest5.Create do
      begin
        Result := HashStreamAsHex(S);
        Free;
      end;
    end;
     
    end.
     

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