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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_IP_PROTECTION_COMMON_PROBABILISTIC_REVEAL_TOKEN_TEST_ISSUER_H_
#define COMPONENTS_IP_PROTECTION_COMMON_PROBABILISTIC_REVEAL_TOKEN_TEST_ISSUER_H_
#include <cstddef>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/base64.h"
#include "base/memory/ptr_util.h"
#include "base/time/time.h"
#include "base/types/expected.h"
#include "components/ip_protection/common/ip_protection_data_types.h"
#include "components/ip_protection/get_probabilistic_reveal_token.pb.h"
#include "third_party/abseil-cpp/absl/status/status.h"
#include "third_party/abseil-cpp/absl/status/statusor.h"
#include "third_party/private-join-and-compute/src/crypto/context.h"
#include "third_party/private-join-and-compute/src/crypto/ec_group.h"
#include "third_party/private-join-and-compute/src/crypto/ec_point.h"
#include "third_party/private-join-and-compute/src/crypto/elgamal.h"
namespace ip_protection {
// Implements a PRT issuer server capabilities, used to create/decrypt tokens
// for tests.
class ProbabilisticRevealTokenTestIssuer {
public:
static base::expected<std::unique_ptr<ProbabilisticRevealTokenTestIssuer>,
absl::Status>
Create(uint64_t private_key);
~ProbabilisticRevealTokenTestIssuer();
// Create a response proto type for a given set of arguments. Tokens in
// response will contain encrypted `plaintexts`. Returns error if
// `plaintexts[i].size()` is not 29. Updates `tokens_` to new ones. `tokens_`
// is set to empty in case of failure, already existing ones (if any) are
// cleared.
base::expected<GetProbabilisticRevealTokenResponse, absl::Status> Issue(
std::vector<std::string> plaintexts,
base::Time expiration,
base::Time next_epoch_start,
int32_t num_tokens_with_signal,
std::string epoch_id);
// Create a response proto type for a given set of arguments. Tokens in
// response will contain ECPoints obtained by hashing `plaintexts` to group.
// Updates `tokens_` to new ones. `tokens_` is set to empty in case of
// failure, already existing ones (if any) are cleared.
base::expected<GetProbabilisticRevealTokenResponse, absl::Status>
IssueByHashingToPoint(std::vector<std::string> plaintexts,
base::Time expiration,
base::Time next_epoch_start,
int32_t num_tokens_with_signal,
std::string epoch_id);
// Decrypt a given `token` and return resulting string. `RevealToken()` will
// return `plaintexts[i]` corresponding to the given `token`. See `Issue()`.
base::expected<std::string, absl::Status> RevealToken(
const ProbabilisticRevealToken& token) const;
// PRTs produced by the `Issue()` call are encrypted plaintexts mapped to
// points using `ECGroup::GetPointByPaddingX(plaintexts[i])`.
// `RevealToken(Tokens()[i])` should yield `plaintexts[i]`.
const std::vector<ProbabilisticRevealToken>& Tokens() const {
return tokens_;
}
std::string GetSerializedPublicKey() const { return serialized_public_key_; }
// Decrypt given token, serialize returned point, and base64 encode.
base::expected<std::string, absl::Status> DecryptSerializeEncode(
const ProbabilisticRevealToken& token);
base::expected<std::vector<std::string>, absl::Status> DecryptSerializeEncode(
const std::vector<ProbabilisticRevealToken>& tokens);
private:
ProbabilisticRevealTokenTestIssuer(
std::unique_ptr<private_join_and_compute::Context> context,
std::unique_ptr<private_join_and_compute::ECGroup> group,
std::unique_ptr<private_join_and_compute::ElGamalEncrypter> encrypter,
std::unique_ptr<private_join_and_compute::ElGamalDecrypter> decrypter,
std::string serialized_public_key);
base::expected<GetProbabilisticRevealTokenResponse, absl::Status>
IssueFromPoints(
std::vector<private_join_and_compute::ECPoint> plaintext_points,
base::Time expiration,
base::Time next_epoch_start,
int32_t num_tokens_with_signal,
std::string epoch_id);
base::expected<private_join_and_compute::ECPoint, absl::Status>
GetPointByPadding(std::string plaintext) const;
base::expected<private_join_and_compute::ECPoint, absl::Status>
GetPointByHashing(std::string message) const;
base::expected<ProbabilisticRevealToken, absl::Status> Encrypt(
const private_join_and_compute::ECPoint& point) const;
base::expected<private_join_and_compute::ECPoint, absl::Status> Decrypt(
const ProbabilisticRevealToken& token) const;
std::unique_ptr<private_join_and_compute::Context> context_;
std::unique_ptr<const private_join_and_compute::ECGroup> group_;
std::unique_ptr<const private_join_and_compute::ElGamalEncrypter> encrypter_;
std::unique_ptr<const private_join_and_compute::ElGamalDecrypter> decrypter_;
const std::string serialized_public_key_;
std::vector<ProbabilisticRevealToken> tokens_;
};
} // namespace ip_protection
#endif // COMPONENTS_IP_PROTECTION_COMMON_PROBABILISTIC_REVEAL_TOKEN_TEST_ISSUER_H_
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