Delphi DLL

Get Base64 Public Key from Private Key

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Demonstrates how to get the public key in base64 format from a private key. Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
bd: HCkBinData;
privKey: HCkPrivateKey;
pubKey: HCkPublicKey;
pubKeyBase64: PWideChar;

begin
success := False;

// Load a private key from base64.
bd := CkBinData_Create();
success := CkBinData_AppendEncoded(bd,'MHQCA....n0Q==','base64');

privKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadAnyFormat(privKey,bd,'');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

pubKey := CkPublicKey_Create();
CkPrivateKey_ToPublicKey(privKey,pubKey);

pubKeyBase64 := CkPublicKey__getEncoded(pubKey,True,'base64');
Memo1.Lines.Add(pubKeyBase64);

CkBinData_Dispose(bd);
CkPrivateKey_Dispose(privKey);
CkPublicKey_Dispose(pubKey);

end;