1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "net/quic/crypto/aes_128_gcm_12_decrypter.h"
6
7 #include "net/quic/test_tools/quic_test_utils.h"
8
9 using base::StringPiece;
10
11 namespace {
12
13 // The AES GCM test vectors come from the file gcmDecrypt128.rsp
14 // downloaded from http://csrc.nist.gov/groups/STM/cavp/index.html on
15 // 2013-02-01. The test vectors in that file look like this:
16 //
17 // [Keylen = 128]
18 // [IVlen = 96]
19 // [PTlen = 0]
20 // [AADlen = 0]
21 // [Taglen = 128]
22 //
23 // Count = 0
24 // Key = cf063a34d4a9a76c2c86787d3f96db71
25 // IV = 113b9785971864c83b01c787
26 // CT =
27 // AAD =
28 // Tag = 72ac8493e3a5228b5d130a69d2510e42
29 // PT =
30 //
31 // Count = 1
32 // Key = a49a5e26a2f8cb63d05546c2a62f5343
33 // IV = 907763b19b9b4ab6bd4f0281
34 // CT =
35 // AAD =
36 // Tag = a2be08210d8c470a8df6e8fbd79ec5cf
37 // FAIL
38 //
39 // ...
40 //
41 // The gcmDecrypt128.rsp file is huge (2.6 MB), so I selected just a
42 // few test vectors for this unit test.
43
44 // Describes a group of test vectors that all have a given key length, IV
45 // length, plaintext length, AAD length, and tag length.
46 struct TestGroupInfo {
47 size_t key_len;
48 size_t iv_len;
49 size_t pt_len;
50 size_t aad_len;
51 size_t tag_len;
52 };
53
54 // Each test vector consists of six strings of lowercase hexadecimal digits.
55 // The strings may be empty (zero length). A test vector with a NULL |key|
56 // marks the end of an array of test vectors.
57 struct TestVector {
58 // Input:
59 const char* key;
60 const char* iv;
61 const char* ct;
62 const char* aad;
63 const char* tag;
64
65 // Expected output:
66 const char* pt; // An empty string "" means decryption succeeded and
67 // the plaintext is zero-length. NULL means decryption
68 // failed.
69 };
70
71 const TestGroupInfo test_group_info[] = {
72 { 128, 96, 0, 0, 128 },
73 { 128, 96, 0, 128, 128 },
74 { 128, 96, 128, 0, 128 },
75 { 128, 96, 408, 160, 128 },
76 { 128, 96, 408, 720, 128 },
77 { 128, 96, 104, 0, 128 },
78 };
79
80 const TestVector test_group_0[] = {
81 { "cf063a34d4a9a76c2c86787d3f96db71",
82 "113b9785971864c83b01c787",
83 "",
84 "",
85 "72ac8493e3a5228b5d130a69d2510e42",
86 ""
87 },
88 { "a49a5e26a2f8cb63d05546c2a62f5343",
89 "907763b19b9b4ab6bd4f0281",
90 "",
91 "",
92 "a2be08210d8c470a8df6e8fbd79ec5cf",
93 NULL // FAIL
94 },
95 { NULL }
96 };
97
98 const TestVector test_group_1[] = {
99 { "d1f6af919cde85661208bdce0c27cb22",
100 "898c6929b435017bf031c3c5",
101 "",
102 "7c5faa40e636bbc91107e68010c92b9f",
103 "ae45f11777540a2caeb128be8092468a",
104 NULL // FAIL
105 },
106 { "2370e320d4344208e0ff5683f243b213",
107 "04dbb82f044d30831c441228",
108 "",
109 "d43a8e5089eea0d026c03a85178b27da",
110 "2a049c049d25aa95969b451d93c31c6e",
111 ""
112 },
113 { NULL }
114 };
115
116 const TestVector test_group_2[] = {
117 { "e98b72a9881a84ca6b76e0f43e68647a",
118 "8b23299fde174053f3d652ba",
119 "5a3c1cf1985dbb8bed818036fdd5ab42",
120 "",
121 "23c7ab0f952b7091cd324835043b5eb5",
122 "28286a321293253c3e0aa2704a278032"
123 },
124 { "33240636cd3236165f1a553b773e728e",
125 "17c4d61493ecdc8f31700b12",
126 "47bb7e23f7bdfe05a8091ac90e4f8b2e",
127 "",
128 "b723c70e931d9785f40fd4ab1d612dc9",
129 "95695a5b12f2870b9cc5fdc8f218a97d"
130 },
131 { "5164df856f1e9cac04a79b808dc5be39",
132 "e76925d5355e0584ce871b2b",
133 "0216c899c88d6e32c958c7e553daa5bc",
134 "",
135 "a145319896329c96df291f64efbe0e3a",
136 NULL // FAIL
137 },
138 { NULL }
139 };
140
141 const TestVector test_group_3[] = {
142 { "af57f42c60c0fc5a09adb81ab86ca1c3",
143 "a2dc01871f37025dc0fc9a79",
144 "b9a535864f48ea7b6b1367914978f9bfa087d854bb0e269bed8d279d2eea1210e48947"
145 "338b22f9bad09093276a331e9c79c7f4",
146 "41dc38988945fcb44faf2ef72d0061289ef8efd8",
147 "4f71e72bde0018f555c5adcce062e005",
148 "3803a0727eeb0ade441e0ec107161ded2d425ec0d102f21f51bf2cf9947c7ec4aa7279"
149 "5b2f69b041596e8817d0a3c16f8fadeb"
150 },
151 { "ebc753e5422b377d3cb64b58ffa41b61",
152 "2e1821efaced9acf1f241c9b",
153 "069567190554e9ab2b50a4e1fbf9c147340a5025fdbd201929834eaf6532325899ccb9"
154 "f401823e04b05817243d2142a3589878",
155 "b9673412fd4f88ba0e920f46dd6438ff791d8eef",
156 "534d9234d2351cf30e565de47baece0b",
157 "39077edb35e9c5a4b1e4c2a6b9bb1fce77f00f5023af40333d6d699014c2bcf4209c18"
158 "353a18017f5b36bfc00b1f6dcb7ed485"
159 },
160 { "52bdbbf9cf477f187ec010589cb39d58",
161 "d3be36d3393134951d324b31",
162 "700188da144fa692cf46e4a8499510a53d90903c967f7f13e8a1bd8151a74adc4fe63e"
163 "32b992760b3a5f99e9a47838867000a9",
164 "93c4fc6a4135f54d640b0c976bf755a06a292c33",
165 "8ca4e38aa3dfa6b1d0297021ccf3ea5f",
166 NULL // FAIL
167 },
168 { NULL }
169 };
170
171 const TestVector test_group_4[] = {
172 { "da2bb7d581493d692380c77105590201",
173 "44aa3e7856ca279d2eb020c6",
174 "9290d430c9e89c37f0446dbd620c9a6b34b1274aeb6f911f75867efcf95b6feda69f1a"
175 "f4ee16c761b3c9aeac3da03aa9889c88",
176 "4cd171b23bddb3a53cdf959d5c1710b481eb3785a90eb20a2345ee00d0bb7868c367ab"
177 "12e6f4dd1dee72af4eee1d197777d1d6499cc541f34edbf45cda6ef90b3c024f9272d7"
178 "2ec1909fb8fba7db88a4d6f7d3d925980f9f9f72",
179 "9e3ac938d3eb0cadd6f5c9e35d22ba38",
180 "9bbf4c1a2742f6ac80cb4e8a052e4a8f4f07c43602361355b717381edf9fabd4cb7e3a"
181 "d65dbd1378b196ac270588dd0621f642"
182 },
183 { "d74e4958717a9d5c0e235b76a926cae8",
184 "0b7471141e0c70b1995fd7b1",
185 "e701c57d2330bf066f9ff8cf3ca4343cafe4894651cd199bdaaa681ba486b4a65c5a22"
186 "b0f1420be29ea547d42c713bc6af66aa",
187 "4a42b7aae8c245c6f1598a395316e4b8484dbd6e64648d5e302021b1d3fa0a38f46e22"
188 "bd9c8080b863dc0016482538a8562a4bd0ba84edbe2697c76fd039527ac179ec5506cf"
189 "34a6039312774cedebf4961f3978b14a26509f96",
190 "e192c23cb036f0b31592989119eed55d",
191 "840d9fb95e32559fb3602e48590280a172ca36d9b49ab69510f5bd552bfab7a306f85f"
192 "f0a34bc305b88b804c60b90add594a17"
193 },
194 { "1986310c725ac94ecfe6422e75fc3ee7",
195 "93ec4214fa8e6dc4e3afc775",
196 "b178ec72f85a311ac4168f42a4b2c23113fbea4b85f4b9dabb74e143eb1b8b0a361e02"
197 "43edfd365b90d5b325950df0ada058f9",
198 "e80b88e62c49c958b5e0b8b54f532d9ff6aa84c8a40132e93e55b59fc24e8decf28463"
199 "139f155d1e8ce4ee76aaeefcd245baa0fc519f83a5fb9ad9aa40c4b21126013f576c42"
200 "72c2cb136c8fd091cc4539877a5d1e72d607f960",
201 "8b347853f11d75e81e8a95010be81f17",
202 NULL // FAIL
203 },
204 { NULL }
205 };
206
207 const TestVector test_group_5[] = {
208 { "387218b246c1a8257748b56980e50c94",
209 "dd7e014198672be39f95b69d",
210 "cdba9e73eaf3d38eceb2b04a8d",
211 "",
212 "ecf90f4a47c9c626d6fb2c765d201556",
213 "48f5b426baca03064554cc2b30"
214 },
215 { "294de463721e359863887c820524b3d4",
216 "3338b35c9d57a5d28190e8c9",
217 "2f46634e74b8e4c89812ac83b9",
218 "",
219 "dabd506764e68b82a7e720aa18da0abe",
220 "46a2e55c8e264df211bd112685"
221 },
222 { "28ead7fd2179e0d12aa6d5d88c58c2dc",
223 "5055347f18b4d5add0ae5c41",
224 "142d8210c3fb84774cdbd0447a",
225 "",
226 "5fd321d9cdb01952dc85f034736c2a7d",
227 "3b95b981086ee73cc4d0cc1422"
228 },
229 { "7d7b6c988137b8d470c57bf674a09c87",
230 "9edf2aa970d016ac962e1fd8",
231 "a85b66c3cb5eab91d5bdc8bc0e",
232 "",
233 "dc054efc01f3afd21d9c2484819f569a",
234 NULL // FAIL
235 },
236 { NULL }
237 };
238
239 const TestVector* const test_group_array[] = {
240 test_group_0,
241 test_group_1,
242 test_group_2,
243 test_group_3,
244 test_group_4,
245 test_group_5,
246 };
247
248 } // namespace
249
250 namespace net {
251 namespace test {
252
253 // DecryptWithNonce wraps the |Decrypt| method of |decrypter| to allow passing
254 // in an nonce and also to allocate the buffer needed for the plaintext.
DecryptWithNonce(Aes128Gcm12Decrypter * decrypter,StringPiece nonce,StringPiece associated_data,StringPiece ciphertext)255 QuicData* DecryptWithNonce(Aes128Gcm12Decrypter* decrypter,
256 StringPiece nonce,
257 StringPiece associated_data,
258 StringPiece ciphertext) {
259 size_t plaintext_size = ciphertext.length();
260 scoped_ptr<char[]> plaintext(new char[plaintext_size]);
261
262 if (!decrypter->Decrypt(nonce, associated_data, ciphertext,
263 reinterpret_cast<unsigned char*>(plaintext.get()),
264 &plaintext_size)) {
265 return NULL;
266 }
267 return new QuicData(plaintext.release(), plaintext_size, true);
268 }
269
TEST(Aes128Gcm12DecrypterTest,Decrypt)270 TEST(Aes128Gcm12DecrypterTest, Decrypt) {
271 for (size_t i = 0; i < arraysize(test_group_array); i++) {
272 SCOPED_TRACE(i);
273 const TestVector* test_vectors = test_group_array[i];
274 const TestGroupInfo& test_info = test_group_info[i];
275 for (size_t j = 0; test_vectors[j].key != NULL; j++) {
276 // If not present then decryption is expected to fail.
277 bool has_pt = test_vectors[j].pt;
278
279 // Decode the test vector.
280 string key;
281 string iv;
282 string ct;
283 string aad;
284 string tag;
285 string pt;
286 ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
287 ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
288 ASSERT_TRUE(DecodeHexString(test_vectors[j].ct, &ct));
289 ASSERT_TRUE(DecodeHexString(test_vectors[j].aad, &aad));
290 ASSERT_TRUE(DecodeHexString(test_vectors[j].tag, &tag));
291 if (has_pt) {
292 ASSERT_TRUE(DecodeHexString(test_vectors[j].pt, &pt));
293 }
294
295 // The test vector's lengths should look sane. Note that the lengths
296 // in |test_info| are in bits.
297 EXPECT_EQ(test_info.key_len, key.length() * 8);
298 EXPECT_EQ(test_info.iv_len, iv.length() * 8);
299 EXPECT_EQ(test_info.pt_len, ct.length() * 8);
300 EXPECT_EQ(test_info.aad_len, aad.length() * 8);
301 EXPECT_EQ(test_info.tag_len, tag.length() * 8);
302 if (has_pt) {
303 EXPECT_EQ(test_info.pt_len, pt.length() * 8);
304 }
305
306 // The test vectors have 16 byte authenticators but this code only uses
307 // the first 12.
308 ASSERT_LE(static_cast<size_t>(Aes128Gcm12Decrypter::kAuthTagSize),
309 tag.length());
310 tag.resize(Aes128Gcm12Decrypter::kAuthTagSize);
311 string ciphertext = ct + tag;
312
313 Aes128Gcm12Decrypter decrypter;
314 ASSERT_TRUE(decrypter.SetKey(key));
315
316 scoped_ptr<QuicData> decrypted(DecryptWithNonce(
317 &decrypter, iv,
318 // This deliberately tests that the decrypter can handle an AAD that
319 // is set to NULL, as opposed to a zero-length, non-NULL pointer.
320 aad.length() ? aad : StringPiece(), ciphertext));
321 if (!decrypted.get()) {
322 EXPECT_FALSE(has_pt);
323 continue;
324 }
325 EXPECT_TRUE(has_pt);
326
327 ASSERT_EQ(pt.length(), decrypted->length());
328 test::CompareCharArraysWithHexError("plaintext", decrypted->data(),
329 pt.length(), pt.data(), pt.length());
330 }
331 }
332 }
333
334 } // namespace test
335 } // namespace net
336