Convert crypto libraries to use Uint32Lists.

pkg/crypto/lib/src/sha1.dart

Index: pkg/crypto/lib/src/sha1.dart
===================================================================
--- pkg/crypto/lib/src/sha1.dart	(revision 43158)
+++ pkg/crypto/lib/src/sha1.dart	(working copy)
@@ -8,10 +8,10 @@
  * SHA1 hash function implementation.
  */
 class SHA1 extends _HashBase {
-  final List<int> _w;
+  final Uint32List _w;
 
   // Construct a SHA1 hasher object.
-  SHA1() : _w = new List(80), super(16, 5, true) {
+  SHA1() : _w = new Uint32List(80), super(16, 5, true) {
     _h[0] = 0x67452301;
     _h[1] = 0xEFCDAB89;
     _h[2] = 0x98BADCFE;
@@ -26,7 +26,7 @@
 
   // Compute one iteration of the SHA1 algorithm with a chunk of
   // 16 32-bit pieces.
-  void _updateHash(List<int> m) {
+  void _updateHash(Uint32List m) {
     assert(m.length == 16);
 
     var a = _h[0];