mirror of
https://github.com/kidfromjupiter/nearby.git
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78 lines
3.0 KiB
C++
78 lines
3.0 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_SHARING_CERTIFICATES_COMMON_H_
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#define THIRD_PARTY_NEARBY_SHARING_CERTIFICATES_COMMON_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include <vector>
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#include "absl/time/time.h"
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#include "absl/types/span.h"
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#include "internal/crypto_cros/encryptor.h"
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#include "internal/crypto_cros/symmetric_key.h"
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namespace nearby {
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namespace sharing {
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// Returns true if the |current_time| exceeds |not_after| by more than the
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// public certificate clock-skew tolerance if applicable.
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bool IsNearbyShareCertificateExpired(absl::Time current_time,
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absl::Time not_after,
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bool use_public_certificate_tolerance);
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// Returns true if the |current_time| is in the interval
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// [|not_before| - tolerance, |not_after| + tolerance), where a clock-skew
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// tolerance is only non-zero if |use_public_certificate_tolerance| is true.
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bool IsNearbyShareCertificateWithinValidityPeriod(
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absl::Time current_time, absl::Time not_before, absl::Time not_after,
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bool use_public_certificate_tolerance);
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// Uses HKDF to create a hash of the |authentication_token|, using the
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// |secret_key|. A trivial info parameter is used, and the output length is
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// fixed to be kNearbyShareNumBytesAuthenticationTokenHash to conform with the
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// GmsCore implementation.
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std::vector<uint8_t> ComputeAuthenticationTokenHash(
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absl::Span<const uint8_t> authentication_token,
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absl::Span<const uint8_t> secret_key);
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// Uses HKDF to generate a new key of length |new_num_bytes| from |key|. To
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// conform with the GmsCore implementation, trivial salt and info are used.
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std::vector<uint8_t> DeriveNearbyShareKey(absl::Span<const uint8_t> key,
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size_t new_num_bytes);
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// Generates a random byte array with size |num_bytes|.
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std::vector<uint8_t> GenerateRandomBytes(size_t num_bytes);
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// Creates a CTR Encryptor used for metadata key encryption/decryption.
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std::unique_ptr<crypto::Encryptor> CreateNearbyShareCtrEncryptor(
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const crypto::SymmetricKey* secret_key, absl::Span<const uint8_t> salt);
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// Generates Time from JAVA Time
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absl::Time FromJavaTime(int64_t ms_since_epoch);
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int64_t ToJavaTime(absl::Time time);
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template <typename T>
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absl::Span<const uint8_t> as_bytes(absl::Span<T> s) noexcept {
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return {reinterpret_cast<const uint8_t*>(s.data()), s.size() * sizeof(T)};
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}
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} // namespace sharing
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_SHARING_CERTIFICATES_COMMON_H_
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