1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
///////////////////////////////////////////////////////////////////////////////
package com.google.crypto.tink.hybrid.internal;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertThrows;
import com.google.common.io.Files;
import com.google.common.truth.Expect;
import com.google.crypto.tink.testing.HpkeTestId;
import com.google.crypto.tink.testing.HpkeTestSetup;
import com.google.crypto.tink.testing.HpkeTestUtil;
import com.google.crypto.tink.testing.HpkeTestVector;
import com.google.crypto.tink.testing.TestUtil;
import java.io.File;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Map;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Unit tests for {@link X25519HpkeKem}. */
@RunWith(JUnit4.class)
public final class X25519HpkeKemTest {
private static final byte[] EXPORT_ONLY_AEAD_ID = HpkeUtil.intToByteArray(2, 0xffff);
private static final String MAC_ALGORITHM = "HmacSha256";
private static Map<HpkeTestId, HpkeTestVector> testVectors;
@Rule public final Expect expect = Expect.create();
@BeforeClass
public static void setUpTestVectors() throws IOException {
String path = "testdata/testvectors/hpke_boringssl.json";
if (TestUtil.isAndroid()) {
path = "/sdcard/googletest/test_runfiles/google3/" + path; // Special prefix for Android.
}
testVectors = HpkeTestUtil.parseTestVectors(Files.newReader(new File(path), UTF_8));
}
private HpkeTestId getDefaultTestId() {
return new HpkeTestId(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_128_GCM_AEAD_ID);
}
private void encapsulate(byte[] mode, byte[] kemId, byte[] kdfId, byte[] aeadId)
throws GeneralSecurityException {
HpkeTestId testId = new HpkeTestId(mode, kemId, kdfId, aeadId);
HpkeTestSetup testSetup = testVectors.get(testId).getTestSetup();
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf(MAC_ALGORITHM));
HpkeKemEncapOutput result =
kem.encapsulate(testSetup.recipientPublicKey, testSetup.senderPrivateKey);
expect.that(result.getSharedSecret()).isEqualTo(testSetup.sharedSecret);
expect.that(result.getEncapsulatedKey()).isEqualTo(testSetup.encapsulatedKey);
}
private void decapsulate(byte[] mode, byte[] kemId, byte[] kdfId, byte[] aeadId)
throws GeneralSecurityException {
HpkeTestId testId = new HpkeTestId(mode, kemId, kdfId, aeadId);
HpkeTestSetup testSetup = testVectors.get(testId).getTestSetup();
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf(MAC_ALGORITHM));
byte[] result =
kem.decapsulate(
testSetup.encapsulatedKey,
X25519HpkeKemPrivateKey.fromBytes(testSetup.recipientPrivateKey));
expect.that(result).isEqualTo(testSetup.sharedSecret);
}
@Test
public void encapsulate_succeedsWithX25519HkdfSha256Aes128Gcm() throws GeneralSecurityException {
encapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_128_GCM_AEAD_ID);
}
@Test
public void encapsulate_succeedsWithX25519HkdfSha256Aes256Gcm() throws GeneralSecurityException {
encapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_256_GCM_AEAD_ID);
}
@Test
public void encapsulate_succeedsWithX25519HkdfSha256ChaCha20Poly1305()
throws GeneralSecurityException {
encapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.CHACHA20_POLY1305_AEAD_ID);
}
@Test
public void encapsulate_succeedsWithX25519HkdfSha256ExportOnlyAead()
throws GeneralSecurityException {
encapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
EXPORT_ONLY_AEAD_ID);
}
@Test
public void encapsulate_failsWithInvalidMacAlgorithm() {
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf("BadMac"));
HpkeTestSetup testSetup = testVectors.get(getDefaultTestId()).getTestSetup();
byte[] validRecipientPublicKey = testSetup.recipientPublicKey;
assertThrows(NoSuchAlgorithmException.class, () -> kem.encapsulate(validRecipientPublicKey));
}
@Test
public void encapsulate_failsWithInvalidRecipientPublicKey() {
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf(MAC_ALGORITHM));
HpkeTestSetup testSetup = testVectors.get(getDefaultTestId()).getTestSetup();
byte[] invalidRecipientPublicKey =
Arrays.copyOf(testSetup.recipientPublicKey, testSetup.recipientPublicKey.length + 2);
assertThrows(InvalidKeyException.class, () -> kem.encapsulate(invalidRecipientPublicKey));
}
@Test
public void decapsulate_succeedsWithX25519HkdfSha256Aes128Gcm() throws GeneralSecurityException {
decapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_128_GCM_AEAD_ID);
}
@Test
public void decapsulate_succeedsWithX25519HkdfSha256Aes256Gcm() throws GeneralSecurityException {
decapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_256_GCM_AEAD_ID);
}
@Test
public void decapsulate_succeedsWithX25519HkdfSha256ChaCha20Poly1305()
throws GeneralSecurityException {
decapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.CHACHA20_POLY1305_AEAD_ID);
}
@Test
public void decapsulate_succeedsWithX25519HkdfSha256ExportOnlyAead()
throws GeneralSecurityException {
decapsulate(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
EXPORT_ONLY_AEAD_ID);
}
@Test
public void decapsulate_failsWithInvalidMacAlgorithm() throws GeneralSecurityException {
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf("BadMac"));
HpkeTestSetup testSetup = testVectors.get(getDefaultTestId()).getTestSetup();
byte[] validEncapsulatedKey = testSetup.encapsulatedKey;
HpkeKemPrivateKey validRecipientPrivateKey =
X25519HpkeKemPrivateKey.fromBytes(testSetup.recipientPrivateKey);
assertThrows(
NoSuchAlgorithmException.class,
() -> kem.decapsulate(validEncapsulatedKey, validRecipientPrivateKey));
}
@Test
public void decapsulate_failsWithInvalidEncapsulatedPublicKey() throws GeneralSecurityException {
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf(MAC_ALGORITHM));
HpkeTestSetup testSetup = testVectors.get(getDefaultTestId()).getTestSetup();
byte[] invalidEncapsulatedKey =
Arrays.copyOf(testSetup.encapsulatedKey, testSetup.encapsulatedKey.length + 2);
HpkeKemPrivateKey validRecipientPrivateKey =
X25519HpkeKemPrivateKey.fromBytes(testSetup.recipientPrivateKey);
assertThrows(
InvalidKeyException.class,
() -> kem.decapsulate(invalidEncapsulatedKey, validRecipientPrivateKey));
}
@Test
public void getKemId_succeeds() throws GeneralSecurityException {
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf(MAC_ALGORITHM));
expect.that(kem.getKemId()).isEqualTo(HpkeUtil.X25519_HKDF_SHA256_KEM_ID);
}
@Test
public void getKemId_failsWithInvalidMacAlgorithm() {
X25519HpkeKem kem = new X25519HpkeKem(new HkdfHpkeKdf("BadMac"));
assertThrows(GeneralSecurityException.class, kem::getKemId);
}
}
|
