Delphi DLL

RSA Encrypt and OpenSSL Decrypt

See more OpenSSL Examples

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rsa: HCkRsa;
privKey: HCkPrivateKey;
pubKey: HCkPublicKey;
plainText: PWideChar;
bUsePrivateKey: Boolean;
encryptedStr: PWideChar;
bd: HCkBinData;

begin
success := False;

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

rsa := CkRsa_Create();

privKey := CkPrivateKey_Create();
success := CkRsa_GenKey(rsa,2048,privKey);
success := CkPrivateKey_SavePkcs8PemFile(privKey,'qa_output/privKey.pem');

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

CkRsa_putEncodingMode(rsa,'base64');
plainText := 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890';
bUsePrivateKey := False;
CkRsa_UsePublicKey(rsa,pubKey);
encryptedStr := CkRsa__encryptStringENC(rsa,plainText,bUsePrivateKey);

bd := CkBinData_Create();
CkBinData_AppendEncoded(bd,encryptedStr,'base64');
success := CkBinData_WriteFile(bd,'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');

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

end;