Change signing code to use shared flx package.

packages/flutter_tools/lib/src/commands/build.dart

@@ -7,11 +7,10 @@ import 'dart:io';
 import 'dart:typed_data';
 
 import 'package:archive/archive.dart';
-import 'package:cipher/cipher.dart';
-import 'package:cipher/impl/client.dart';
 import 'package:yaml/yaml.dart';
 
-import '../signing.dart';
+import 'package:flx/bundle.dart';
+import 'package:flx/signing.dart';
 import '../toolchain.dart';
 import 'flutter_command.dart';
 
@@ -100,16 +99,6 @@ ArchiveFile _createFile(String key, String assetBase) {
   return new ArchiveFile.noCompress(key, content.length, content);
 }
 
-// Writes a 32-bit length followed by the content of [bytes].
-void _writeBytesWithLength(File outputFile, List<int> bytes) {
-  if (bytes == null)
-    bytes = new Uint8List(0);
-  assert(bytes.length < 0xffffffff);
-  ByteData length = new ByteData(4)..setUint32(0, bytes.length, Endianness.LITTLE_ENDIAN);
-  outputFile.writeAsBytesSync(length.buffer.asUint8List(), mode: FileMode.APPEND);
-  outputFile.writeAsBytesSync(bytes, mode: FileMode.APPEND);
-}
-
 ArchiveFile _createSnapshotFile(String snapshotPath) {
   File file = new File(snapshotPath);
   List<int> content = file.readAsBytesSync();
@@ -139,7 +128,6 @@ class BuildCommand extends FlutterCommand {
 
   @override
   Future<int> run() async {
-    initCipher();
     String compilerPath = argResults['compiler'];
 
     if (compilerPath == null)
@@ -193,16 +181,15 @@ class BuildCommand extends FlutterCommand {
         archive.addFile(file);
     }
 
-    ECPrivateKey privateKey = await loadPrivateKey(privateKeyPath);
-    ECPublicKey publicKey = publicKeyFromPrivateKey(privateKey);
-
-    File outputFile = new File(outputPath);
-    outputFile.writeAsStringSync('#!mojo mojo:sky_viewer\n');
+    KeyPair keyPair = KeyPair.readFromPrivateKeySync(privateKeyPath);
     Uint8List zipBytes = new Uint8List.fromList(new ZipEncoder().encode(archive));
-    Uint8List manifestBytes = serializeManifest(manifestDescriptor, publicKey, zipBytes);
-    _writeBytesWithLength(outputFile, signManifest(manifestBytes, privateKey));
-    _writeBytesWithLength(outputFile, manifestBytes);
-    outputFile.writeAsBytesSync(zipBytes, mode: FileMode.APPEND, flush: true);
+    Bundle bundle = new Bundle.fromContent(
+      path: outputPath,
+      manifest: manifestDescriptor,
+      contentBytes: zipBytes,
+      keyPair: keyPair
+    );
+    bundle.writeSync();
     return 0;
   }
 }

packages/flutter_tools/lib/src/signing.dart

@@ -1,94 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'dart:async';
-import 'dart:convert';
-import 'dart:io';
-import 'dart:typed_data';
-
-import 'package:asn1lib/asn1lib.dart';
-import 'package:bignum/bignum.dart';
-import 'package:cipher/cipher.dart';
-
-// The ECDSA algorithm parameters we're using. These match the parameters used
-// by the Flutter updater package.
-final ECDomainParameters _ecDomain = new ECDomainParameters('prime256v1');
-final String kSignerAlgorithm = 'SHA-256/ECDSA';
-final String kHashAlgorithm = 'SHA-256';
-
-final SecureRandom _random = _initRandom();
-
-SecureRandom _initRandom() {
-  // TODO(mpcomplete): Provide a better seed here. External entropy source?
-  final Uint8List key = new Uint8List(16);
-  final KeyParameter keyParam = new KeyParameter(key);
-  final ParametersWithIV params = new ParametersWithIV(keyParam, new Uint8List(16));
-  SecureRandom random = new SecureRandom('AES/CTR/AUTO-SEED-PRNG')
-      ..seed(params);
-  return random;
-}
-
-// Returns a serialized manifest, with the public key and hash of the content
-// included.
-Uint8List serializeManifest(Map manifestDescriptor, ECPublicKey publicKey, Uint8List zipBytes) {
-  if (manifestDescriptor == null)
-    return null;
-  final List<String> kSavedKeys = [
-    'name',
-    'version',
-    'update-url'
-  ];
-  Map outputManifest = new Map();
-  manifestDescriptor.forEach((key, value) {
-    if (kSavedKeys.contains(key))
-      outputManifest[key] = value;
-  });
-
-  if (publicKey != null)
-    outputManifest['key'] = BASE64.encode(publicKey.Q.getEncoded());
-
-  Uint8List zipHash = new Digest(kHashAlgorithm).process(zipBytes);
-  BigInteger zipHashInt = new BigInteger.fromBytes(1, zipHash);
-  outputManifest['content-hash'] = zipHashInt.intValue();
-
-  return new Uint8List.fromList(UTF8.encode(JSON.encode(outputManifest)));
-}
-
-// Returns the ASN.1 encoded signature of the input manifestBytes.
-List<int> signManifest(Uint8List manifestBytes, ECPrivateKey privateKey) {
-  if (manifestBytes == null || privateKey == null)
-    return [];
-  Signer signer = new Signer(kSignerAlgorithm);
-  PrivateKeyParameter params = new PrivateKeyParameter(privateKey);
-  signer.init(true, new ParametersWithRandom(params, _random));
-  ECSignature signature = signer.generateSignature(manifestBytes);
-  ASN1Sequence asn1 = new ASN1Sequence()
-    ..add(new ASN1Integer(signature.r))
-    ..add(new ASN1Integer(signature.s));
-  return asn1.encodedBytes;
-}
-
-ECPrivateKey _asn1ParsePrivateKey(ECDomainParameters ecDomain, Uint8List privateKey) {
-  ASN1Parser parser = new ASN1Parser(privateKey);
-  ASN1Sequence seq = parser.nextObject();
-  assert(seq.elements.length >= 2);
-  ASN1OctetString keyOct = seq.elements[1];
-  BigInteger d = new BigInteger.fromBytes(1, keyOct.octets);
-  return new ECPrivateKey(d, ecDomain);
-}
-
-Future<ECPrivateKey> loadPrivateKey(String privateKeyPath) async {
-  File file = new File(privateKeyPath);
-  if (!file.existsSync())
-    return null;
-  List<int> bytes = file.readAsBytesSync();
-  return _asn1ParsePrivateKey(_ecDomain, new Uint8List.fromList(bytes));
-}
-
-ECPublicKey publicKeyFromPrivateKey(ECPrivateKey privateKey) {
-  if (privateKey == null)
-    return null;
-  ECPoint Q = privateKey.parameters.G * privateKey.d;
-  return new ECPublicKey(Q, privateKey.parameters);
-}

packages/flutter_tools/pubspec.yaml

@@ -12,6 +12,7 @@ dependencies:
   args: ^0.13.0
   asn1lib: ^0.4.1
   cipher: ^0.7.1
+  flx: ^0.0.1
   crypto: ^0.9.1
   mustache4dart: ^1.0.0
   path: ^1.3.0