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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
#include <attestation/HmacKeyManager.h>
#include <gtest/gtest.h>
namespace android {
class HmacKeyManagerTest : public testing::Test {
protected:
HmacKeyManager mHmacKeyManager;
};
/**
* Ensure that separate calls to sign the same data are generating the same key.
* We avoid asserting against INVALID_HMAC. Since the key is random, there is a non-zero chance
* that a specific key and data combination would produce INVALID_HMAC, which would cause flaky
* tests.
*/
TEST_F(HmacKeyManagerTest, GeneratedHmac_IsConsistent) {
std::array<uint8_t, 10> data = {4, 3, 5, 1, 8, 5, 2, 7, 1, 8};
std::array<uint8_t, 32> hmac1 = mHmacKeyManager.sign(data.data(), sizeof(data));
std::array<uint8_t, 32> hmac2 = mHmacKeyManager.sign(data.data(), sizeof(data));
ASSERT_EQ(hmac1, hmac2);
}
/**
* Ensure that changes in the hmac verification data produce a different hmac.
*/
TEST_F(HmacKeyManagerTest, GeneratedHmac_ChangesWhenFieldsChange) {
std::array<uint8_t, 10> data = {4, 3, 5, 1, 8, 5, 2, 7, 1, 8};
std::array<uint8_t, 32> initialHmac = mHmacKeyManager.sign(data.data(), sizeof(data));
data[2] = 2;
ASSERT_NE(initialHmac, mHmacKeyManager.sign(data.data(), sizeof(data)));
}
} // namespace android
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