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Side by Side Diff: pkg/crypto/lib/src/hmac.dart

Issue 16624003: Remove the crypto factories (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 7 years, 6 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 part of crypto; 5 part of crypto;
6 6
7 class _HMAC implements HMAC { 7 /**
8 * Hash-based Message Authentication Code support.
9 *
10 * The [add] method is used to add data to the message. The [digest] and
11 * [close] methods are used to extract the message authentication code.
12 */
13 // TODO(floitsch): make Hash implement Sink, EventSink or similar.
14 class HMAC {
8 bool _isClosed = false; 15 bool _isClosed = false;
9 16
10 _HMAC(Hash this._hash, List<int> this._key) : _message = []; 17 /**
18 * Create an [HMAC] object from a [Hash] and a key.
19 */
20 HMAC(Hash this._hash, List<int> this._key) : _message = [];
11 21
22 /**
23 * Add a list of bytes to the message.
24 */
12 add(List<int> data) { 25 add(List<int> data) {
13 if (_isClosed) throw new StateError("HMAC is closed"); 26 if (_isClosed) throw new StateError("HMAC is closed");
14 _message.addAll(data); 27 _message.addAll(data);
15 } 28 }
16 29
30 /**
31 * Extract the message digest as a list of bytes without closing [this].
32 */
17 List<int> get digest { 33 List<int> get digest {
18 var blockSize = _hash.blockSize; 34 var blockSize = _hash.blockSize;
19 35
20 // Hash the key if it is longer than the block size of the hash. 36 // Hash the key if it is longer than the block size of the hash.
21 if (_key.length > blockSize) { 37 if (_key.length > blockSize) {
22 _hash = _hash.newInstance(); 38 _hash = _hash.newInstance();
23 _hash.add(_key); 39 _hash.add(_key);
24 _key = _hash.close(); 40 _key = _hash.close();
25 } 41 }
26 42
(...skipping 24 matching lines...) Expand all
51 padding[i] = 0x5c ^ _key[i]; 67 padding[i] = 0x5c ^ _key[i];
52 } 68 }
53 69
54 // Outer hash computation which is the result. 70 // Outer hash computation which is the result.
55 _hash = _hash.newInstance(); 71 _hash = _hash.newInstance();
56 _hash.add(padding); 72 _hash.add(padding);
57 _hash.add(innerHash); 73 _hash.add(innerHash);
58 return _hash.close(); 74 return _hash.close();
59 } 75 }
60 76
77 /**
78 * Perform the actual computation and extract the message digest
79 * as a list of bytes.
80 */
61 List<int> close() { 81 List<int> close() {
62 _isClosed = true; 82 _isClosed = true;
63 return digest; 83 return digest;
64 } 84 }
65 85
86 /**
87 * Verify that the HMAC computed for the data so far matches the
88 * given message digest.
89 *
90 * This method should be used instead of memcmp-style comparisons
91 * to avoid leaking information via timing.
92 *
93 * Throws an exception if the given digest does not have the same
94 * size as the digest computed by this HMAC instance.
95 */
66 bool verify(List<int> digest) { 96 bool verify(List<int> digest) {
67 var computedDigest = this.digest; 97 var computedDigest = this.digest;
68 if (digest.length != computedDigest.length) { 98 if (digest.length != computedDigest.length) {
69 throw new ArgumentError( 99 throw new ArgumentError(
70 'Invalid digest size: ${digest.length} in HMAC.verify. ' 100 'Invalid digest size: ${digest.length} in HMAC.verify. '
71 'Expected: ${_hash.blockSize}.'); 101 'Expected: ${_hash.blockSize}.');
72 } 102 }
73 int result = 0; 103 int result = 0;
74 for (var i = 0; i < digest.length; i++) { 104 for (var i = 0; i < digest.length; i++) {
75 result |= digest[i] ^ computedDigest[i]; 105 result |= digest[i] ^ computedDigest[i];
76 } 106 }
77 return result == 0; 107 return result == 0;
78 } 108 }
79 109
80 // HMAC internal state. 110 // HMAC internal state.
81 Hash _hash; 111 Hash _hash;
82 List<int> _key; 112 List<int> _key;
83 List<int> _message; 113 List<int> _message;
84 } 114 }
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