| // 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.testing; |
| |
| import com.google.crypto.tink.hybrid.internal.HpkeUtil; |
| import com.google.gson.JsonArray; |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonObject; |
| import com.google.gson.JsonParser; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** Test utility class for parsing test vectors from the HPKE I.-D. in JSON format. */ |
| public final class HpkeTestUtil { |
| /** |
| * Parses JSON-formatted test vectors from {@code path} into a {@link java.util.Map} from {@link |
| * com.google.crypto.tink.hybrid.internal.HpkeTestId}s to {@link |
| * com.google.crypto.tink.hybrid.internal.HpkeTestVector}s. |
| * |
| * <p>Example test vectors are available at |
| * https://github.com/cfrg/draft-irtf-cfrg-hpke/blob/5f503c564da00b0687b3de75f1dfbdfc4079ad31/test-vectors.json. |
| * |
| * @throws IOException if there's an error opening/parsing the file. |
| */ |
| public static Map<HpkeTestId, HpkeTestVector> parseTestVectors(Reader reader) throws IOException { |
| Map<HpkeTestId, HpkeTestVector> testVectors = new HashMap<>(); |
| JsonArray testArray = JsonParser.parseReader(reader).getAsJsonArray(); |
| for (JsonElement testElement : testArray) { |
| JsonObject testObject = testElement.getAsJsonObject(); |
| HpkeTestId testId = |
| new HpkeTestId( |
| testObject.get("mode").getAsInt(), |
| testObject.get("kem_id").getAsInt(), |
| testObject.get("kdf_id").getAsInt(), |
| testObject.get("aead_id").getAsInt()); |
| // Filter out test vectors for unsupported modes and/or KEMs. |
| if (Arrays.equals(testId.mode, HpkeUtil.BASE_MODE)) { |
| HpkeTestSetup testSetup = |
| new HpkeTestSetup( |
| testObject.get("info").getAsString(), |
| testObject.get("pkEm").getAsString(), |
| testObject.get("skEm").getAsString(), |
| testObject.get("pkRm").getAsString(), |
| testObject.get("skRm").getAsString(), |
| testObject.get("enc").getAsString(), |
| testObject.get("shared_secret").getAsString(), |
| testObject.get("key_schedule_context").getAsString(), |
| testObject.get("secret").getAsString(), |
| testObject.get("key").getAsString(), |
| testObject.get("base_nonce").getAsString()); |
| JsonArray encryptionsArray = testObject.get("encryptions").getAsJsonArray(); |
| List<HpkeTestEncryption> testEncryptions = new ArrayList<>(); |
| for (JsonElement encryptionElement : encryptionsArray) { |
| JsonObject encryptionObject = encryptionElement.getAsJsonObject(); |
| HpkeTestEncryption testEncryption = |
| new HpkeTestEncryption( |
| testSetup.baseNonce, |
| encryptionObject.get("plaintext").getAsString(), |
| encryptionObject.get("aad").getAsString(), |
| encryptionObject.get("nonce").getAsString(), |
| encryptionObject.get("ciphertext").getAsString()); |
| testEncryptions.add(testEncryption); |
| } |
| testVectors.put(testId, new HpkeTestVector(testId, testSetup, testEncryptions)); |
| } |
| } |
| return testVectors; |
| } |
| |
| private HpkeTestUtil() {} |
| } |