Removed fixed dependencies

packages/crypto/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.
+
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'digest.dart';
+import 'hash.dart';
+import 'hash_sink.dart';
+import 'utils.dart';
+
+/// An instance of [MD5].
+///
+/// This instance provides convenient access to the [MD5][rfc] hash function.
+///
+/// [rfc]: https://tools.ietf.org/html/rfc1321
+///
+/// **Warning**: MD5 has known collisions and should only be used when required
+/// for backwards compatibility.
+final md5 = new MD5._();
+
+/// An implementation of the [MD5][rfc] hash function.
+///
+/// [rfc]: https://tools.ietf.org/html/rfc1321
+///
+/// **Warning**: MD5 has known collisions and should only be used when required
+/// for backwards compatibility.
+///
+/// Note that it's almost always easier to use [md5] rather than creating a new
+/// instance.
+class MD5 extends Hash {
+  @override
+  final int blockSize = 16 * bytesPerWord;
+
+  MD5._();
+
+  @override
+  ByteConversionSink startChunkedConversion(Sink<Digest> sink) =>
+      new ByteConversionSink.from(new _MD5Sink(sink));
+}
+
+/// Data from a non-linear mathematical function that functions as
+/// reproducible noise.
+const _noise = 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
+];
+
+/// Per-round shift amounts.
+const _shiftAmounts = 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
+];
+
+/// The concrete implementation of [MD5].
+///
+/// This is separate so that it can extend [HashSink] without leaking additional
+/// public members.
+class _MD5Sink extends HashSink {
+  @override
+  final digest = new Uint32List(4);
+
+  _MD5Sink(Sink<Digest> sink)
+      : super(sink, 16, endian: Endianness.LITTLE_ENDIAN) {
+    digest[0] = 0x67452301;
+    digest[1] = 0xefcdab89;
+    digest[2] = 0x98badcfe;
+    digest[3] = 0x10325476;
+  }
+
+  @override
+  void updateHash(Uint32List chunk) {
+    assert(chunk.length == 16);
+
+    var a = digest[0];
+    var b = digest[1];
+    var c = digest[2];
+    var d = digest[3];
+
+    var e;
+    var f;
+
+    for (var i = 0; i < 64; i++) {
+      if (i < 16) {
+        e = (b & c) | ((~b & mask32) & d);
+        f = i;
+      } else if (i < 32) {
+        e = (d & b) | ((~d & mask32) & c);
+        f = ((5 * i) + 1) % 16;
+      } else if (i < 48) {
+        e = b ^ c ^ d;
+        f = ((3 * i) + 5) % 16;
+      } else {
+        e = c ^ (b | (~d & mask32));
+        f = (7 * i) % 16;
+      }
+
+      var temp = d;
+      d = c;
+      c = b;
+      b = add32(
+          b,
+          rotl32(add32(add32(a, e), add32(_noise[i], chunk[f])),
+              _shiftAmounts[i]));
+      a = temp;
+    }
+
+    digest[0] = add32(a, digest[0]);
+    digest[1] = add32(b, digest[1]);
+    digest[2] = add32(c, digest[2]);
+    digest[3] = add32(d, digest[3]);
+  }
+}