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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 library crypto; 5 library crypto;
6 6
7 import 'dart:math'; 7 import 'dart:math';
8 8
9 part 'src/crypto_utils.dart'; 9 part 'src/crypto_utils.dart';
10 part 'src/hash_utils.dart'; 10 part 'src/hash_utils.dart';
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47 /** 47 /**
48 * Internal block size of the hash in bytes. 48 * Internal block size of the hash in bytes.
49 * 49 *
50 * This is exposed for use by the HMAC class which needs to know the 50 * This is exposed for use by the HMAC class which needs to know the
51 * block size for the [Hash] it is using. 51 * block size for the [Hash] it is using.
52 */ 52 */
53 int get blockSize; 53 int get blockSize;
54 } 54 }
55 55
56 /** 56 /**
57 * SHA1 hash function implementation.
58 */
59 class SHA1 implements Hash {
60 factory SHA1() => new _SHA1();
61 }
62
63 /**
64 * SHA256 hash function implementation.
65 */
66 class SHA256 implements Hash {
67 factory SHA256() => new _SHA256();
68 }
69
70 /**
71 * MD5 hash function implementation.
72 *
73 * WARNING: MD5 has known collisions and should only be used when
74 * required for backwards compatibility.
75 */
76 class MD5 implements Hash {
77 factory MD5() => new _MD5();
78 }
79
80 /**
81 * Hash-based Message Authentication Code support.
82 *
83 * The [add] method is used to add data to the message. The [digest] and
84 * [close] methods are used to extract the message authentication code.
85 */
86 // TODO(floitsch): make Hash implement Sink, EventSink or similar.
87 class HMAC {
88 /**
89 * Create an [HMAC] object from a [Hash] and a key.
90 */
91 factory HMAC(Hash hash, List<int> key) => new _HMAC(hash, key);
92
93 /**
94 * Add a list of bytes to the message.
95 */
96 add(List<int> data);
97
98 /**
99 * Perform the actual computation and extract the message digest
100 * as a list of bytes.
101 */
102 List<int> close();
103
104 /**
105 * Extract the message digest as a list of bytes without closing [this].
106 */
107 List<int> get digest;
108
109 /**
110 * Verify that the HMAC computed for the data so far matches the
111 * given message digest.
112 *
113 * This method should be used instead of memcmp-style comparisons
114 * to avoid leaking information via timing.
115 *
116 * Throws an exception if the given digest does not have the same
117 * size as the digest computed by this HMAC instance.
118 */
119 bool verify(List<int> digest);
120 }
121
122 /**
123 * Utility methods for working with message digests. 57 * Utility methods for working with message digests.
124 */ 58 */
125 class CryptoUtils { 59 class CryptoUtils {
126 /** 60 /**
127 * Convert a list of bytes (for example a message digest) into a hex 61 * Convert a list of bytes (for example a message digest) into a hex
128 * string. 62 * string.
129 */ 63 */
130 static String bytesToHex(List<int> bytes) { 64 static String bytesToHex(List<int> bytes) {
131 return _CryptoUtils.bytesToHex(bytes); 65 return _CryptoUtils.bytesToHex(bytes);
132 } 66 }
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162 * 96 *
163 * Accepts both URL safe and unsafe Base 64 encoded strings. 97 * Accepts both URL safe and unsafe Base 64 encoded strings.
164 * 98 *
165 * Based on [RFC 4648](http://tools.ietf.org/html/rfc4648) 99 * Based on [RFC 4648](http://tools.ietf.org/html/rfc4648)
166 */ 100 */
167 static List<int> base64StringToBytes(String input, 101 static List<int> base64StringToBytes(String input,
168 {bool ignoreInvalidCharacters : true}) { 102 {bool ignoreInvalidCharacters : true}) {
169 return _CryptoUtils.base64StringToBytes(input, ignoreInvalidCharacters); 103 return _CryptoUtils.base64StringToBytes(input, ignoreInvalidCharacters);
170 } 104 }
171 } 105 }
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