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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CRYPTO_UNEXPORTABLE_KEY_METRICS_H_
#define CRYPTO_UNEXPORTABLE_KEY_METRICS_H_
#include <string>
#include "crypto/crypto_export.h"
#include "crypto/unexportable_key.h"
namespace crypto {
enum class TPMOperation {
// An operation to sign data with a TPM key.
kMessageSigning,
// An operation to verify a TPM signature.
kMessageVerify,
// An operation to create a TPM key from a wrapped key or a similar
// representation identifying a TPM key.
kWrappedKeyCreation,
// An operation to create a new TPM-protected key.
kNewKeyCreation,
// An operation to export a wrapped key (or a similar representation
// identifying a TPM key) from an existing TPM key.
kWrappedKeyExport,
};
// Converts the given `operation` to a string representation.
CRYPTO_EXPORT std::string OperationToString(TPMOperation operation);
// Converts the given `algorithm` to a string representation.
CRYPTO_EXPORT std::string AlgorithmToString(
SignatureVerifier::SignatureAlgorithm algorithm);
// Records UMA metrics of TPM availability, latency and successful usage.
// Does the work on a new background task.
CRYPTO_EXPORT void MaybeMeasureTpmOperations(
UnexportableKeyProvider::Config config);
// internal namespace to be used by tests only
namespace internal {
// Note that values here are used in a recorded histogram. Don't change
// the values of existing members.
enum class TPMSupport {
kNone = 0,
kRSA = 1,
kECDSA = 2,
kMaxValue = 2,
};
// Note that values here are used in a recorded histogram. Don't change
// the values of existing members.
enum class TPMType {
kNone = 0,
kHW = 1,
kVirtual = 2,
kBoth = 3,
kMaxValue = 3,
};
// Exported for testing
CRYPTO_EXPORT void MeasureTpmOperationsInternalForTesting();
} // namespace internal
} // namespace crypto
#endif // CRYPTO_UNEXPORTABLE_KEY_METRICS_H_
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