Convert crypto libraries to use Uint32Lists.

pkg/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';
 
 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';
 
 /**
  * Interface for cryptographic hash functions.
@@ skipping 78 matching lines @@
    * 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);
   }
 }