Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/crypto/lib/crypto.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * Cryptographic algorithms, with support for hash functions such as
+ * SHA-1, SHA-256, HMAC, and MD5.
+ */
+library crypto;
+
+import 'dart:math';
+import 'dart:typed_data';
+import 'dart:convert';
+
+part 'src/crypto_utils.dart';
+part 'src/hash_utils.dart';
+part 'src/hmac.dart';
+part 'src/md5.dart';
+part 'src/sha1.dart';
+part 'src/sha256.dart';
+part 'src/base64.dart';
+
+/**
+ * Interface for cryptographic hash functions.
+ *
+ * The [add] method is used to add data to the hash. The [close] method
+ * is used to extract the message digest.
+ *
+ * Once the [close] method has been called no more data can be added using the
+ * [add] method. If [add] is called after the first call to [close] a
+ * HashException is thrown.
+ *
+ * If multiple instances of a given Hash is needed the [newInstance]
+ * method can provide a new instance.
+ */
+// TODO(floitsch): make Hash implement Sink, EventSink or similar.
+abstract class Hash {
+  /**
+   * Add a list of bytes to the hash computation.
+   */
+  void add(List<int> data);
+
+  /**
+   * Finish the hash computation and extract the message digest as
+   * a list of bytes.
+   */
+  List<int> close();
+
+  /**
+   * Returns a new instance of this hash function.
+   */
+  Hash newInstance();
+
+  /**
+   * Internal block size of the hash in bytes.
+   *
+   * This is exposed for use by the HMAC class which needs to know the
+   * block size for the [Hash] it is using.
+   */
+  int get blockSize;
+}
+
+/**
+ * Utility methods for working with message digests.
+ */
+class CryptoUtils {
+  /**
+   * Convert a list of bytes (for example a message digest) into a hex
+   * string.
+   */
+  static String bytesToHex(List<int> bytes) {
+    return _CryptoUtils.bytesToHex(bytes);
+  }
+
+  /**
+   * Converts a list of bytes into a Base 64 encoded string.
+   *
+   * The list can be any list of integers in the range 0..255,
+   * for example a message digest.
+   *
+   * If [addLineSeparator] is true, the resulting string will  be
+   * broken into lines of 76 characters, separated by "\r\n".
+   *
+   * If [urlSafe] is true, the result is URL and filename safe.
+   *
+   * Based on [RFC 4648](http://tools.ietf.org/html/rfc4648)
+   *
+   */
+  static String bytesToBase64(List<int> bytes,
+                              {bool urlSafe : false,
+                               bool addLineSeparator : false}) {
+    return _CryptoUtils.bytesToBase64(bytes,
+                                      urlSafe,
+                                      addLineSeparator);
+  }
+
+
+  /**
+   * Converts a Base 64 encoded String into list of bytes.
+   *
+   * Decoder ignores "\r\n" sequences from input.
+   *
+   * Accepts both URL safe and unsafe Base 64 encoded strings.
+   *
+   * Throws a FormatException exception if input contains invalid characters.
+   *
+   * Based on [RFC 4648](http://tools.ietf.org/html/rfc4648)
+   */
+  static List<int> base64StringToBytes(String input) {
+    return _CryptoUtils.base64StringToBytes(input);
+  }
+}