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// 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.HpkeTestEncryption;
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.InvalidAlgorithmParameterException;
import java.util.List;
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 AesGcmHpkeAead}. */
@RunWith(JUnit4.class)
public final class AesGcmHpkeAeadTest {
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 HpkeTestVector getTestVector(byte[] mode, byte[] kemId, byte[] kdfId, byte[] aeadId) {
HpkeTestId testId = new HpkeTestId(mode, kemId, kdfId, aeadId);
return testVectors.get(testId);
}
private void testSealAndOpen(
AesGcmHpkeAead aead, byte[] mode, byte[] kemId, byte[] kdfId, byte[] aeadId)
throws GeneralSecurityException {
HpkeTestVector testVector = getTestVector(mode, kemId, kdfId, aeadId);
HpkeTestSetup testSetup = testVector.getTestSetup();
List<HpkeTestEncryption> encryptions = testVector.getEncryptions();
for (HpkeTestEncryption encryption : encryptions) {
byte[] ciphertext =
aead.seal(
testSetup.key, encryption.nonce, encryption.plaintext, encryption.associatedData);
byte[] plaintext =
aead.open(
testSetup.key, encryption.nonce, encryption.ciphertext, encryption.associatedData);
expect.that(ciphertext).isEqualTo(encryption.ciphertext);
expect.that(plaintext).isEqualTo(encryption.plaintext);
}
}
@Test
public void sealAndOpen_aes128Gcm() throws GeneralSecurityException {
AesGcmHpkeAead aead = new AesGcmHpkeAead(16);
testSealAndOpen(
aead,
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_128_GCM_AEAD_ID);
}
@Test
public void sealAndOpen_aes256Gcm() throws GeneralSecurityException {
AesGcmHpkeAead aead = new AesGcmHpkeAead(32);
testSealAndOpen(
aead,
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_256_GCM_AEAD_ID);
}
@Test
public void create_invalidKeyLength() {
assertThrows(InvalidAlgorithmParameterException.class, () -> new AesGcmHpkeAead(24));
}
@Test
public void seal_wrongKeyLength() throws GeneralSecurityException {
AesGcmHpkeAead aead = new AesGcmHpkeAead(32);
HpkeTestVector testVector =
getTestVector(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_128_GCM_AEAD_ID); // 16-byte keys incompatible with above 'aead'.
HpkeTestSetup setup = testVector.getTestSetup();
HpkeTestEncryption encryption = testVector.getEncryptions().get(0);
assertThrows(
InvalidAlgorithmParameterException.class,
() ->
aead.seal(
setup.key, encryption.nonce, encryption.plaintext, encryption.associatedData));
}
@Test
public void open_wrongKeyLength() throws GeneralSecurityException {
AesGcmHpkeAead aead = new AesGcmHpkeAead(16);
HpkeTestVector testVector =
getTestVector(
HpkeUtil.BASE_MODE,
HpkeUtil.X25519_HKDF_SHA256_KEM_ID,
HpkeUtil.HKDF_SHA256_KDF_ID,
HpkeUtil.AES_256_GCM_AEAD_ID); // 32-byte keys incompatible with above 'aead'.
HpkeTestSetup setup = testVector.getTestSetup();
HpkeTestEncryption encryption = testVector.getEncryptions().get(0);
assertThrows(
InvalidAlgorithmParameterException.class,
() ->
aead.open(
setup.key, encryption.nonce, encryption.ciphertext, encryption.associatedData));
}
}
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