Dart

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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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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).

  final pubKey = CkPublicKey();

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

  try {
    pubKey.loadBase64(keyStr);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Loaded a ${pubKey.keyType} public key.');
}