crypto/algorithms.cc

// 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.
//

#include "crypto/algorithms.h"

#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"

namespace credentio {

absl::StatusOr<HashAlgorithm> NidToHashAlgorithm(int nid) {
  HashAlgorithm algorithm = static_cast<HashAlgorithm>(nid);
  switch (algorithm) {
    case HashAlgorithm::kSha256:
    case HashAlgorithm::kSha384:
    case HashAlgorithm::kSha512:
      return algorithm;
  }
  return absl::InvalidArgumentError(
      absl::StrCat("hash algorithm NID is not on C2PA allowlist: ", nid));
}

absl::StatusOr<HashAlgorithm> ParseHashAlgorithm(absl::string_view txt) {
  if (txt == "sha256") {
    return HashAlgorithm::kSha256;
  } else if (txt == "sha384") {
    return HashAlgorithm::kSha384;
  } else if (txt == "sha512") {
    return HashAlgorithm::kSha512;
  } else {
    return absl::InvalidArgumentError("unrecognized hash algorithm name");
  }
}

}  // namespace credentio