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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 2023 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.crypto.tink.Key;
import com.google.crypto.tink.PrivateKey;
import com.google.errorprone.annotations.Immutable;
import java.util.Optional;
import javax.annotation.Nullable;

/**
 * Represents a key to compute JWT using asymmetric cryptography (i.e., using the {@link
 * JwtPublicKeySign} interface).
 */
@Immutable
public abstract class JwtSignaturePrivateKey extends Key implements PrivateKey {
  @Override
  public abstract JwtSignaturePublicKey getPublicKey();

  /**
   * Returns the "kid" to be used for this key (https://www.rfc-editor.org/rfc/rfc7517#section-4.5).
   *
   * Note that the "kid" is not necessarily related to Tink's "Key ID" in the keyset.
   *
   * 
If present, this kid will be written into the {@code kid} header during {@code
   * computeMacAndEncode}. If absent, no kid will be written.
   *
   * 
If present, and the {@code kid} header is present, the contents of the {@code kid} header
   * needs to match the return value of this function.
   *
   * Note that {@code getParameters.allowKidAbsent()} specifies if omitting the {@code kid}
   * header is allowed. Of course, if {@code getParameters.allowKidAbsent()} is true, then {@code
   * getKid} must not return an empty {@link Optional}.
   */
  public Optional getKid() {
    return getPublicKey().getKid();
  }

  @Override
  public abstract JwtSignatureParameters getParameters();

  @Override
  @Nullable
  public Integer getIdRequirementOrNull() {
    return getPublicKey().getIdRequirementOrNull();
  }
}