(Delphi DLL) Get an Ed25519 Key in Raw Hex Format

Demonstrates how to get the private and public key parts of an Ed25519 key in lowercase hex formmat.

Note: This example requires Chilkat v9.5.0.83 or greater.

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, PrivateKey, StringBuilder;

...

procedure TForm1.Button1Click(Sender: TObject);
var
privKey: HCkPrivateKey;
success: Boolean;
sbPubKeyHex: HCkStringBuilder;
privKeyHex: PWideChar;

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

// Load an Ed25519 key from some format..
privKey := CkPrivateKey_Create();

// This loads an Ed25519 key from an unencrypted PEM file (no password required).
success := CkPrivateKey_LoadAnyFormatFile(privKey,'qa_data/eddsa/ed25519.pem','');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

// The key type should be "ed25519" to indicate an Ed25519 key.
Memo1.Lines.Add('key type = ' + CkPrivateKey__keyType(privKey));

// What is the size of the private key in bits?  (should always be 256 bits for Ed25519)
Memo1.Lines.Add('size in bits = ' + IntToStr(CkPrivateKey_getBitLength(privKey)));

// Get the private and public key parts in raw hex format:
sbPubKeyHex := CkStringBuilder_Create();
privKeyHex := CkPrivateKey__getRawHex(privKey,sbPubKeyHex);

// We should have a 32-byte private key (a 64 character hex string).
Memo1.Lines.Add('private key = ' + privKeyHex);

// We should have a 32-byte public key (a 64 character hex string).
Memo1.Lines.Add('public key = ' + CkStringBuilder__getAsString(sbPubKeyHex));

// Sample output:
// key type = ed25519
// size in bits = 256
// private key = d4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842
// public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1

CkPrivateKey_Dispose(privKey);
CkStringBuilder_Dispose(sbPubKeyHex);

end;