Delphi ActiveX

Export a Public Key as XML

Demonstrates the Chilkat PublicKey.GetXml method, which returns the public key in Chilkat XML format. It takes no arguments; the exact representation (for example an RSAPublicKey element) depends on the key type.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: The XML key format comes from the .NET/XML-DSIG world; exporting to it lets you hand a public key to .NET code or a system built around XML signatures. It is the inverse of LoadXml-style loading. Because a public key is not secret, this XML can be shared freely.

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var
success: Integer;
pubKey: TPublicKey;
xml: WideString;

begin
success := 0;

//  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
//  JWK, and other supported representations.
pubKey := TPublicKey.Create(Self);
success := pubKey.LoadFromFile('qa_data/public.pem');
if (success = 0) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;

//  Export the public key in Chilkat XML format.  The representation depends on the key type (for
//  example an RSAPublicKey element for RSA).
xml := pubKey.GetXml();
if (pubKey.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(xml);