tsp/parsed_timestamp_token.h

// Copyright 2026 Google LLC
//
// 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
//
//    https://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 THIRD_PARTY_CREDENTIO_TSP_PARSED_TIMESTAMP_TOKEN_H_
#define THIRD_PARTY_CREDENTIO_TSP_PARSED_TIMESTAMP_TOKEN_H_

#include <string>
#include <vector>

#include "absl/base/attributes.h"
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "crypto/algorithms.h"

namespace credentio {

// Represents a successfully parsed CMS TimestampToken ready for extraction.
class ParsedTimestampToken {
 public:
  virtual ~ParsedTimestampToken() = default;

  // Verifies the signature of this token. Note that this does not perform trust
  // checks.
  virtual absl::Status VerifySignature() const = 0;

  // Returns the hash algorithm used to calculate the message imprint.
  virtual absl::StatusOr<HashAlgorithm> GetMessageImprintHashAlgorithm()
      const = 0;

  // Returns the certificate chain of the TSA certificate. The first element
  // is the leaf certificate, followed by any intermediate certificates.
  // The certificates are DER encoded.
  virtual absl::StatusOr<std::vector<std::string>> GetCertificateChain()
      const = 0;

  // Extracts the DER-encoded SigningCertificateV2 attribute from the signer.
  // The lifetime of the returned absl::string_view is tied to this
  // ParsedTimestampToken instance.
  virtual absl::StatusOr<absl::string_view> GetSigningCertificateV2Bytes() const
      ABSL_ATTRIBUTE_LIFETIME_BOUND = 0;

  // Gets the raw DER-encoded TstInfo content.
  // The lifetime of the returned absl::string_view is tied to this
  // ParsedTimestampToken instance.
  virtual absl::StatusOr<absl::string_view> GetTstInfoBytes() const
      ABSL_ATTRIBUTE_LIFETIME_BOUND = 0;
};

}  // namespace credentio

#endif  // THIRD_PARTY_CREDENTIO_TSP_PARSED_TIMESTAMP_TOKEN_H_