Delphi ActiveX

Load a Public Key from Base64 DER

Demonstrates the Chilkat PublicKey.LoadBase64 method, which loads a public key from standard Base64-encoded DER. The only argument is the Base64 string; whitespace within it is permitted.

Background: A public key in DER (binary) form is often carried as Base64 text so it can travel through channels that expect a string — a config value, a JSON field, a certificate export. This loader decodes that text and inspects the DER to determine the key type and structure automatically. It is the plain-Base64 counterpart to loading a full PEM block, which additionally has the BEGIN/END armor.

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

begin
success := 0;

//  Demonstrates the PublicKey.LoadBase64 method, which loads a public key from standard
//  Base64-encoded DER.  The only argument is the Base64 string (whitespace is allowed).

pubKey := TPublicKey.Create(Self);

//  The Base64 of the DER-encoded public key.
keyStr := 'MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA...IDAQAB';

success := pubKey.LoadBase64(keyStr);
if (success = 0) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;

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