Stop using parts.

lib/src/md5.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.
 
-part of crypto;
+library crypto.md5;
+
+import 'dart:typed_data';
+
+import 'hash.dart';
+import 'hash_base.dart';
+import 'utils.dart';
 
 /**
  * MD5 hash function implementation.
  *
  * WARNING: MD5 has known collisions and should only be used when
  * required for backwards compatibility.
  */
-class MD5 extends _HashBase {
-  MD5() : super(16, 4, false) {
-    _h[0] = 0x67452301;
-    _h[1] = 0xefcdab89;
-    _h[2] = 0x98badcfe;
-    _h[3] = 0x10325476;
+abstract class MD5 implements Hash {
+  factory MD5() = _MD5;
+
+  MD5 newInstance();
+}
+
+class _MD5 extends HashBase implements MD5 {
+  _MD5() : super(16, 4, false) {
+    h[0] = 0x67452301;
+    h[1] = 0xefcdab89;
+    h[2] = 0x98badcfe;
+    h[3] = 0x10325476;
   }
 
   // Returns a new instance of this Hash.
   MD5 newInstance() {
-    return new MD5();
+    return new _MD5();
   }
 
   static const _k = const [
     0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
     0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
     0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
     0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
     0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
     0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
     0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
     0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
     0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
     0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
     0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
   ];
 
   static const _r = const [
     07, 12, 17, 22, 07, 12, 17, 22, 07, 12, 17, 22, 07, 12, 17, 22, 05, 09, 14,
     20, 05, 09, 14, 20, 05, 09, 14, 20, 05, 09, 14, 20, 04, 11, 16, 23, 04, 11,
     16, 23, 04, 11, 16, 23, 04, 11, 16, 23, 06, 10, 15, 21, 06, 10, 15, 21, 06,
     10, 15, 21, 06, 10, 15, 21
   ];
 
   // Compute one iteration of the MD5 algorithm with a chunk of
   // 16 32-bit pieces.
-  void _updateHash(Uint32List m) {
+  void updateHash(Uint32List m) {
     assert(m.length == 16);
 
-    var a = _h[0];
-    var b = _h[1];
-    var c = _h[2];
-    var d = _h[3];
+    var a = h[0];
+    var b = h[1];
+    var c = h[2];
+    var d = h[3];
 
     var t0;
     var t1;
 
     for (var i = 0; i < 64; i++) {
       if (i < 16) {
-        t0 = (b & c) | ((~b & _MASK_32) & d);
+        t0 = (b & c) | ((~b & MASK_32) & d);
         t1 = i;
       } else if (i < 32) {
-        t0 = (d & b) | ((~d & _MASK_32) & c);
+        t0 = (d & b) | ((~d & MASK_32) & c);
         t1 = ((5 * i) + 1) % 16;
       } else if (i < 48) {
         t0 = b ^ c ^ d;
         t1 = ((3 * i) + 5) % 16;
       } else {
-        t0 = c ^ (b | (~d & _MASK_32));
+        t0 = c ^ (b | (~d & MASK_32));
         t1 = (7 * i) % 16;
       }
 
       var temp = d;
       d = c;
       c = b;
-      b = _add32(
-          b, _rotl32(_add32(_add32(a, t0), _add32(_k[i], m[t1])), _r[i]));
+      b = add32(
+          b, rotl32(add32(add32(a, t0), add32(_k[i], m[t1])), _r[i]));
       a = temp;
     }
 
-    _h[0] = _add32(a, _h[0]);
-    _h[1] = _add32(b, _h[1]);
-    _h[2] = _add32(c, _h[2]);
-    _h[3] = _add32(d, _h[3]);
+    h[0] = add32(a, h[0]);
+    h[1] = add32(b, h[1]);
+    h[2] = add32(c, h[2]);
+    h[3] = add32(d, h[3]);
   }
 }