(Delphi ActiveX) RSA Encrypt and OpenSSL Decrypt

Demonstrates how to use Chilkat to RSA encrypt, and then use OpenSSL to decrypt.

Note: This example requires Chilkat v11.0.0 or greater.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
rsa: TChilkatRsa;
privKey: TPrivateKey;
pubKey: TPublicKey;
plainText: WideString;
bUsePrivateKey: Integer;
encryptedStr: WideString;
bd: TChilkatBinData;

begin
success := 0;

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

rsa := TChilkatRsa.Create(Self);

privKey := TPrivateKey.Create(Self);
success := rsa.GenKey(2048,privKey.ControlInterface);
success := privKey.SavePkcs8PemFile('qa_output/privKey.pem');

pubKey := TPublicKey.Create(Self);
privKey.ToPublicKey(pubKey.ControlInterface);

rsa.EncodingMode := 'base64';
plainText := 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890';
bUsePrivateKey := 0;
rsa.UsePublicKey(pubKey.ControlInterface);
encryptedStr := rsa.EncryptStringENC(plainText,bUsePrivateKey);

bd := TChilkatBinData.Create(Self);
bd.AppendEncoded(encryptedStr,'base64');
success := bd.WriteFile('qa_output/enc.dat');

// The OpenSSL command to decrypt is:
// openssl pkeyutl -in enc.dat -inkey privKey.pem -keyform PEM -pkeyopt rsa_padding_mode:pkcs1 -decrypt

Memo1.Lines.Add('OK');
end;