(Delphi DLL) Load RSA Public Key from Hex Modulus and Exponent

Load an RSA public key from a hex 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, BinData, Xml, PublicKey;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
modulus: PWideChar;
exponent: PWideChar;
bdModulus: HCkBinData;
bdExponent: HCkBinData;
xml: HCkXml;
pubkey: HCkPublicKey;

begin
// Load a 128-byte (1024-bit) modulus + exponent into a Chilkat public key object..
modulus := 'BF5F4AF9A018B5F324A0C10448C0D3248D9BE78967FDC551A27876AC5789ADCBA8245D3D942AE3799563D895DA801E765D225A54FA15DAB2C4731DD817DCF94A9AD62197074C2349442093A206234BF3747F0E88AA6F538355684CC1FB26FCE029C9050A1DAF9F507C2BABF6EFC9FB16320C8036721BE0279FBB76122C41E429';

exponent := '00000003';

// We'll need to re-encode from hex to base64..
bdModulus := CkBinData_Create();
CkBinData_AppendEncoded(bdModulus,modulus,'hex');
bdExponent := CkBinData_Create();
CkBinData_AppendEncoded(bdExponent,exponent,'hex');

xml := CkXml_Create();
CkXml_putTag(xml,'RsaKeyValue');
CkXml_NewChild2(xml,'Modulus',CkBinData__getEncoded(bdModulus,'base64'));
CkXml_NewChild2(xml,'Exponent',CkBinData__getEncoded(bdExponent,'base64'));

// Now load into the pubkey object..
pubkey := CkPublicKey_Create();
success := CkPublicKey_LoadFromString(pubkey,CkXml__getXml(xml));
if (success = False) then
  begin
    Memo1.Lines.Add(CkPublicKey__lastErrorText(pubkey));
    Exit;
  end;

Memo1.Lines.Add('Success.');

CkBinData_Dispose(bdModulus);
CkBinData_Dispose(bdExponent);
CkXml_Dispose(xml);
CkPublicKey_Dispose(pubkey);

end;