(Delphi DLL) RSA Encrypt with Modulus and Exponent

Demonstrates how to RSA encrypt with a given modulus and exponent.

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, Xml, Rsa;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rsa: HCkRsa;
modulus: PWideChar;
exponent: PWideChar;
xml: HCkXml;
publicKey: PWideChar;
success: Boolean;
usePrivateKey: Boolean;
plainText: PWideChar;
encryptedStrBase64: PWideChar;

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

rsa := CkRsa_Create();

// Assuming you already have a base64 modulus and exponent,
// wrap it in XML like this:
modulus := 'qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM=';
exponent := 'AQAB';

xml := CkXml_Create();
CkXml_putTag(xml,'RSAPublicKey');
CkXml_NewChild2(xml,'Modulus',modulus);
CkXml_NewChild2(xml,'Exponent',exponent);

// Encrypt with the public key.
publicKey := CkXml__getXml(xml);
success := CkRsa_ImportPublicKey(rsa,publicKey);

usePrivateKey := False;
plainText := 'message in a bottle';

CkRsa_putEncodingMode(rsa,'base64');
encryptedStrBase64 := CkRsa__encryptStringENC(rsa,plainText,usePrivateKey);
Memo1.Lines.Add(encryptedStrBase64);

CkRsa_Dispose(rsa);
CkXml_Dispose(xml);

end;