(Delphi DLL) Hash the Contents of a File (SHA256 and other hash algorithms)

Demonstrates how to hash the contents of a file using SHA256, SHA384, SHA512, MD2, MD5, HAVAL, RIPEMD, etc.

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, StringBuilder, CkByteData, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: HCkCrypt2;
hashBytes: HCkByteData;
sb: HCkStringBuilder;

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

crypt := CkCrypt2_Create();

// Choose the hash algorithm.
// Can be  "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320".
CkCrypt2_putHashAlgorithm(crypt,'sha256');

hashBytes := CkByteData_Create();
success := CkCrypt2_HashFile(crypt,'qa_data/jpg/starfish.jpg',hashBytes);

// Let's examine the hash as a hex string.
sb := CkStringBuilder_Create();
CkStringBuilder_AppendEncoded(sb,hashBytes,'hex');
Memo1.Lines.Add('SHA256 hash = ' + CkStringBuilder__getAsString(sb));

CkCrypt2_Dispose(crypt);
CkByteData_Dispose(hashBytes);
CkStringBuilder_Dispose(sb);

end;