(Delphi DLL) RSA Import Public Key from Certificate PEM

Uses a certificate's public key for RSA encryption. The public key from the certificate .pem file is used.

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, Rsa, PublicKey, Cert;

...

procedure TForm1.Button1Click(Sender: TObject);
var
cert: HCkCert;
success: Boolean;
pubKey: HCkPublicKey;
rsa: HCkRsa;
encryptedStr: PWideChar;

begin
cert := CkCert_Create();

success := CkCert_LoadFromFile(cert,'qa_data/pem/mf_public_rsa.pem');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

pubKey := CkCert_ExportPublicKey(cert);
if (CkCert_getLastMethodSuccess(cert) <> True) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

rsa := CkRsa_Create();
success := CkRsa_ImportPublicKeyObj(rsa,pubKey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRsa__lastErrorText(rsa));
    Exit;
  end;

CkPublicKey_Dispose(pubKey);

CkRsa_putEncodingMode(rsa,'base64');
encryptedStr := CkRsa__encryptStringENC(rsa,'hello',False);
Memo1.Lines.Add('encrypted string = ' + encryptedStr);

CkCert_Dispose(cert);
CkRsa_Dispose(rsa);

end;