(Delphi DLL) Calculate MD5 Hash of File (or SHA1, SHA256, and other hash algorithms)

Demonstrates how to calculate a hash for a file's contents.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: HCkCrypt2;
hashStr: PWideChar;

begin
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

crypt := CkCrypt2_Create();

// Set the name of the hash algorithm.
// Other choices include "sha1", "sha256", "sha384", "sha512", "md2", "md5", and "haval". 
CkCrypt2_putHashAlgorithm(crypt,'md5');

// EncodingMode specifies the encoding of the hash output.
// It may be "hex", "url", "base64", or "quoted-printable".
CkCrypt2_putEncodingMode(crypt,'hex');

// Files of any type may be hashed -- it doesn't matter
// if the file is binary or text...

hashStr := CkCrypt2__hashFileENC(crypt,'/temp/something.dat');
if (CkCrypt2_getLastMethodSuccess(crypt) <> True) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

Memo1.Lines.Add(hashStr);

CkCrypt2_Dispose(crypt);

end;