Big merge from experimental to bleeding edge.

tests/lib/crypto/hmac_sha256_test.dart

Index: tests/lib/crypto/hmac_sha256_test.dart
diff --git a/tests/lib/crypto/hmac_sha256_test.dart b/tests/lib/crypto/hmac_sha256_test.dart
index 8b2deb5670ce0a6a3b0e6ec09f1dd429367ac590..bfd85b2bbdac34d24743102524134ce44d44eee0 100644
--- a/tests/lib/crypto/hmac_sha256_test.dart
+++ b/tests/lib/crypto/hmac_sha256_test.dart
@@ -11,7 +11,9 @@ part 'hmac_sha256_test_vectors.dart';
 
 void testStandardVectors(inputs, keys, macs) {
   for (var i = 0; i < inputs.length; i++) {
-    var d = new HMAC(new SHA256(), keys[i]).update(inputs[i]).digest();
+    var hmac = new HMAC(new SHA256(), keys[i]);
+    hmac.add(inputs[i]);
+    var d = hmac.close();
     Expect.isTrue(CryptoUtils.bytesToHex(d).startsWith(macs[i]), '$i');
   }
 }