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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 2017 Google Inc.
//
// 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.signature;

import com.google.crypto.tink.config.TinkFips;
import com.google.crypto.tink.proto.RegistryConfig;
import java.security.GeneralSecurityException;

/**
 * Static methods and constants for registering with the {@link com.google.crypto.tink.Registry} all
 * instances of {@link com.google.crypto.tink.PublicKeySign} and {@link
 * com.google.crypto.tink.PublicKeyVerify} key types supported in a particular release of Tink.
 *
 * To register all PublicKeySign and PublicKeyVerify key types provided in the latest Tink
 * version one can do:
 *
 * 
{@code
 * SignatureConfig.init();
 * }
 *
 * For more information on how to obtain and use instances of PublicKeySign or PublicKeyVerify,
 * see {@link PublicKeySignFactory} or {@link PublicKeyVerifyFactory}.
 *
 * @since 1.0.0
 */
public final class SignatureConfig {
  public static final String ECDSA_PUBLIC_KEY_TYPE_URL = new EcdsaVerifyKeyManager().getKeyType();
  public static final String ECDSA_PRIVATE_KEY_TYPE_URL = new EcdsaSignKeyManager().getKeyType();
  public static final String ED25519_PUBLIC_KEY_TYPE_URL =
      new Ed25519PublicKeyManager().getKeyType();
  public static final String ED25519_PRIVATE_KEY_TYPE_URL =
      new Ed25519PrivateKeyManager().getKeyType();
  public static final String RSA_PKCS1_PRIVATE_KEY_TYPE_URL =
      new RsaSsaPkcs1SignKeyManager().getKeyType();
  public static final String RSA_PKCS1_PUBLIC_KEY_TYPE_URL =
      new RsaSsaPkcs1VerifyKeyManager().getKeyType();
  public static final String RSA_PSS_PRIVATE_KEY_TYPE_URL =
      new RsaSsaPssSignKeyManager().getKeyType();
  public static final String RSA_PSS_PUBLIC_KEY_TYPE_URL =
      new RsaSsaPssVerifyKeyManager().getKeyType();

  /**
   * @deprecated Call {@link #register} instead.
   */
  @Deprecated
  public static final RegistryConfig TINK_1_0_0 = RegistryConfig.getDefaultInstance();

  /**
   * @deprecated Call {@link #register} instead.
   */
  @Deprecated
  public static final RegistryConfig TINK_1_1_0 = RegistryConfig.getDefaultInstance();

  /**
   * @deprecated Call {@link #register} instead.
   */
  @Deprecated
  public static final RegistryConfig LATEST = RegistryConfig.getDefaultInstance();

  static {
    try {
      init();
    } catch (GeneralSecurityException e) {
      throw new ExceptionInInitializerError(e);
    }
  }

  /**
   * Tries to register with the {@link com.google.crypto.tink.Registry} all instances of {@link
   * com.google.crypto.tink.Catalogue} needed to handle PublicKeySign and PublicKeyVerify key types
   * supported in Tink.
   *
   * @deprecated use {@link #register}
   */
  @Deprecated
  public static void init() throws GeneralSecurityException {
    register();
  }

  /**
   * Tries to register with the {@link com.google.crypto.tink.Registry} all instances of {@link
   * com.google.crypto.tink.Catalogue} needed to handle PublicKeySign and PublicKeyVerify key types
   * supported in Tink.
   *
   * @since 1.2.0
   */
  public static void register() throws GeneralSecurityException {
    PublicKeySignWrapper.register();
    PublicKeyVerifyWrapper.register();

    EcdsaSignKeyManager.registerPair(/*newKeyAllowed=*/ true);
    RsaSsaPkcs1SignKeyManager.registerPair(/*newKeyAllowed=*/ true);

    if (TinkFips.useOnlyFips()) {
      // If Tink is built in FIPS-mode do not register algorithms which are not compatible.
      return;
    }

    RsaSsaPssSignKeyManager.registerPair(/*newKeyAllowed=*/ true);
    Ed25519PrivateKeyManager.registerPair(/*newKeyAllowed=*/ true);
  }

  private SignatureConfig() {}
}