Remove library dart:crypto

sdk/lib/crypto/hmac.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 dart.crypto;
-
-class _HMAC implements HMAC {
-  bool _isClosed = false;
-
-  _HMAC(Hash this._hash, List<int> this._key) : _message = [];
-
-  add(List<int> data) {
-    if (_isClosed) throw new StateError("HMAC is closed");
-    _message.addAll(data);
-  }
-
-  List<int> get digest {
-    var blockSize = _hash.blockSize;
-
-    // Hash the key if it is longer than the block size of the hash.
-    if (_key.length > blockSize) {
-      _hash = _hash.newInstance();
-      _hash.add(_key);
-      _key = _hash.close();
-    }
-
-    // Zero-pad the key until its size is equal to the block size of the hash.
-    if (_key.length < blockSize) {
-      var newKey = new List(blockSize);
-      newKey.setRange(0, _key.length, _key);
-      for (var i = _key.length; i < blockSize; i++) {
-        newKey[i] = 0;
-      }
-      _key = newKey;
-    }
-
-    // Compute inner padding.
-    var padding = new List(blockSize);
-    for (var i = 0; i < blockSize; i++) {
-      padding[i] = 0x36 ^ _key[i];
-    }
-
-    // Inner hash computation.
-    _hash = _hash.newInstance();
-    _hash.add(padding);
-    _hash.add(_message);
-    var innerHash = _hash.close();
-
-    // Compute outer padding.
-    for (var i = 0; i < blockSize; i++) {
-      padding[i] = 0x5c ^ _key[i];
-    }
-
-    // Outer hash computation which is the result.
-    _hash = _hash.newInstance();
-    _hash.add(padding);
-    _hash.add(innerHash);
-    return _hash.close();
-  }
-
-  List<int> close() {
-    _isClosed = true;
-    return digest;
-  }
-
-  bool verify(List<int> digest) {
-    var computedDigest = this.digest;
-    if (digest.length != computedDigest.length) {
-      throw new ArgumentError(
-          'Invalid digest size: ${digest.length} in HMAC.verify. '
-          'Expected: ${_hash.blockSize}.');
-    }
-    int result = 0;
-    for (var i = 0; i < digest.length; i++) {
-      result |= digest[i] ^ computedDigest[i];
-    }
-    return result == 0;
-  }
-
-  // HMAC internal state.
-  Hash _hash;
-  List<int> _key;
-  List<int> _message;
-}