Increase test coverage for sha1 and sha256 by using standard test

tests/lib/src/crypto/sha256Test.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.
 
 // TODO(ager): Replace with "dart:crypto" when ready.
 #import("../../../../lib/crypto/crypto.dart");
 
+#source('sha256_long_test_vectors.dart');
+#source('sha256_short_test_vectors.dart');
+
 List<int> createTestArr(int len) {
   var arr = new List<int>(len);
   for (var i = 0; i < len; i++) {
     arr[i] = i;
   }
   return arr;
 }
 
 String digestToString(List<int> digest) {
   var buf = new StringBuffer();
@@ skipping 270 matching lines @@
 
 void testInvalidUse() {
   var sha = new SHA256();
   sha.digest();
   Expect.throws(sha.digest,
                 (e) => e is CryptoHashException);
   Expect.throws(() => sha.update([0]),
                 (e) => e is CryptoHashException);
 }
 
+void testStandardVectors(inputs, mds) {
+  for (var i = 0; i < inputs.length; i++) {
+    var d = new SHA256().update(inputs[i]).digest();
+    Expect.equals(mds[i], digestToString(d), '$i');
+  }
+}
+
 void main() {
   test();
   testInvalidUse();
+  testStandardVectors(sha256_long_inputs, sha256_long_mds);
+  testStandardVectors(sha256_short_inputs, sha256_short_mds);
 }