docs: function _verifyManifestDockerContentDigest(res, jws) {
      var dcdInfo = _parseDockerContentDigest(
          res.headers['docker-content-digest']);
  
      dcdInfo.hash.update(jws.payload);
      var digest = dcdInfo.hash.digest('hex');
      if (dcdInfo.expectedDigest !== digest) {
          res.log.trace({expectedDigest: dcdInfo.expectedDigest,
              header: dcdInfo.raw, digest: digest},
              'Docker-Content-Digest failure');
          throw new restifyErrors.BadDigestError('Docker-Content-Digest');
      }
  }