OpenSSHKeyPairs.decode constructor

OpenSSHKeyPairs.decode(Uint8List keyBlob)

Implementation

factory OpenSSHKeyPairs.decode(Uint8List keyBlob) {
  final reader = SSHMessageReader(keyBlob);
  final actualMagic = reader.readBytes(magic.length);
  if (!actualMagic.equals(magic.codeUnits)) {
    throw FormatException('Invalid magic: ${latin1.decode(actualMagic)}');
  }
  reader.readUint8(); // terminator of magic
  final cipher = reader.readUtf8();
  final kdfName = reader.readUtf8();

  late final OpenSSHBcryptKdfOptions? kdfOptions;
  final kdfOptionsBlock = reader.readString();

  if (cipher == 'none') {
    kdfOptions = null;
  } else if (kdfName == 'bcrypt') {
    kdfOptions = OpenSSHBcryptKdfOptions.decode(kdfOptionsBlock);
  } else {
    throw UnsupportedError('Unsupported key derivation function: $kdfName');
  }

  final keyCount = reader.readUint32();
  final publicKeys = <Uint8List>[];
  for (var i = 0; i < keyCount; i++) {
    publicKeys.add(reader.readString());
  }

  final privateKeysBlob = reader.readString();

  return OpenSSHKeyPairs(
    cipherName: cipher,
    kdfName: kdfName,
    kdfOptions: kdfOptions,
    publicKeys: publicKeys,
    privateKeyBlob: privateKeysBlob,
  );
}