Delphi ActiveX

Load a Private Key from XML Text

Demonstrates the Chilkat PrivateKey.LoadXml method, which loads a private key from XML text. The only argument is the XML string. Supported roots include RSAKeyValue, DSAKeyValue, ECCKeyValue, and Ed25519KeyValue.

Background: XML key representations such as RSAKeyValue come from the .NET/XML-DSIG world, where keys are exchanged as XML elements. This loads that form — the inverse of GetXml — which is handy for interoperating with .NET code or systems built around XML signatures. It is a plaintext format, so protect the XML like any unencrypted key material.

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var
success: Integer;
privKey: TPrivateKey;
xmlText: WideString;

begin
success := 0;

//  Demonstrates the PrivateKey.LoadXml method, which loads a private key from XML text.  The only
//  argument is the XML string.  Supported roots include RSAKeyValue, DSAKeyValue, ECCKeyValue,
//  and Ed25519KeyValue.

privKey := TPrivateKey.Create(Self);

//  The XML text of a private key (for example as produced by GetXml).
xmlText := '<RSAKeyValue><Modulus>...</Modulus><Exponent>AQAB</Exponent>...</RSAKeyValue>';

success := privKey.LoadXml(xmlText);
if (success = 0) then
  begin
    Memo1.Lines.Add(privKey.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Loaded a ' + privKey.KeyType + ' private key.');