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additional_authenticated_data_generator.h
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additional_authenticated_data_generator.h
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/*
*
* Copyright 2019 Asylo authors
*
* 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.
*
*/
#ifndef ASYLO_IDENTITY_ADDITIONAL_AUTHENTICATED_DATA_GENERATOR_H_
#define ASYLO_IDENTITY_ADDITIONAL_AUTHENTICATED_DATA_GENERATOR_H_
#include <memory>
#include "asylo/crypto/util/byte_container_view.h"
#include "asylo/crypto/util/bytes.h"
#include "asylo/util/statusor.h"
namespace asylo {
constexpr int kAdditionalAuthenticatedDataUuidSize = 16;
constexpr int kAdditionalAuthenticatedDataPurposeSize = 16;
constexpr int kAdditionalAuthenticatedDataSize = 64;
// Generates additional authenticated data for use in security protocols that
// use enclave assertions. The produced additional authenticated data is 64
// bytes, where the relevant values are encoded as: [0..31] = SHA256(data),
// [32..47] = purpose, [48..63] = UUID.
class AdditionalAuthenticatedDataGenerator {
public:
// Creates a generator that uses |uuid| and |purpose|.
AdditionalAuthenticatedDataGenerator(
UnsafeBytes<kAdditionalAuthenticatedDataUuidSize> uuid,
UnsafeBytes<kAdditionalAuthenticatedDataPurposeSize> purpose);
// Creates a generator that generates AAD suitable for use in assertions for
// Get PCE Info from Intel's PCE.
static std::unique_ptr<AdditionalAuthenticatedDataGenerator>
CreateGetPceInfoAadGenerator();
// Creates a generator that generates AAD suitable for use in assertions for
// PCE Sign Report from Intel's PCE.
static std::unique_ptr<AdditionalAuthenticatedDataGenerator>
CreatePceSignReportAadGenerator();
// Creates a generator that generates AAD suitable for use in assertions for
// Enclave Key Exchange Protocol.
static std::unique_ptr<AdditionalAuthenticatedDataGenerator>
CreateEkepAadGenerator();
// Generates a formatted additional authenticated data value using |data|.
// Returns a non-OK Status if AAD generation fails.
StatusOr<UnsafeBytes<kAdditionalAuthenticatedDataSize>> Generate(
ByteContainerView data) const;
private:
// Defines the UUID used in AAD generated by this object.
const UnsafeBytes<kAdditionalAuthenticatedDataUuidSize> uuid_;
// Defines the purpose of the AAD generated by this object.
const UnsafeBytes<kAdditionalAuthenticatedDataPurposeSize> purpose_;
};
} // namespace asylo
#endif // ASYLO_IDENTITY_ADDITIONAL_AUTHENTICATED_DATA_GENERATOR_H_