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Tink is a small cryptographic library that provides a safe, simple, agile and fast way to accomplish some common cryptographic tasks.

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// Copyright 2020 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
//
//      http://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.
//
////////////////////////////////////////////////////////////////////////////////

package com.google.crypto.tink.jwt;

import com.google.errorprone.annotations.Immutable;
import java.security.GeneralSecurityException;

/**
 * Interface for authenticating and verifying JWT with JWS MAC, as described in RFC 7519 and RFC
 * 7515.
 *
 * Security guarantees: similar to {@link com.google.crypto.tink.Mac}.
 */
@Immutable
public interface JwtMac {
  /** Computes a MAC, and encodes the JWT and the MAC in the JWS compact serialization format. */
  String computeMacAndEncode(RawJwt token) throws GeneralSecurityException;

  /**
   * Decodes and verifies a JWT in the JWS compact serialization format.
   *
   * The JWT is validated against the rules in {@code validator}. That is, every claim in {@code
   * validator} must also be present in the JWT. For example, if {@code validator} contains an
   * {@code iss} claim, the JWT must contain an identical claim. The JWT can contain claims that are
   * {@code NOT} in the {@code validator}. However, if the JWT contains a list of audiences, the
   * validator must also contain an audience in the list.
   *
   * If the JWT contains timestamp claims such as {@code exp}, {@code iat} or {@code nbf}, they
   * will also be validated. {@code validator} allows to set a clock skew, to deal with small clock
   * differences among different machines.
   *
   * @throws GeneralSecurityException when the signature of the token could not be verified, the
   *     token contains an invalid claim or header, the token has been expired or can't be used yet
   */
  VerifiedJwt verifyMacAndDecode(String compact, JwtValidator validator)
      throws GeneralSecurityException;
}