Delphi ActiveX

Load a Public Key from a String

Demonstrates the Chilkat PublicKey.LoadFromString method, which loads a public key from a string. The only argument is the string. Chilkat examines the content and recognizes PEM public keys, unencrypted PEM private keys (taking only the public portion), XML, JWK, and more.

Background: This is the forgiving text loader: rather than requiring you to know the exact format, it inspects whatever string you provide and figures it out. A useful convenience is that it accepts an unencrypted private key too and keeps only the public half — handy when you have a key pair but need just the public key. Use it whenever the textual format is uncertain or varies by source.

Chilkat Delphi ActiveX Downloads

Download Chilkat for Delphi ActiveX

Delphi ActiveX

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

begin
success := 0;

//  Demonstrates the PublicKey.LoadFromString method, which loads a public key from a string.  The
//  only argument is the string.  Chilkat examines the content and recognizes PEM public keys,
//  unencrypted PEM private keys (using only the public portion), XML, JWK, and more.

pubKey := TPublicKey.Create(Self);

//  The PEM text of a public key.
keyText := '-----BEGIN PUBLIC KEY-----' + #10 + 'MIIBIjANBgkq...IDAQAB' + #10 + '-----END PUBLIC KEY-----';

success := pubKey.LoadFromString(keyText);
if (success = 0) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Loaded a ' + pubKey.KeyType + ' public key.');