/*
    * GordianKnot: Security Suite
    * Copyright 2026. Tony Washer
    *
    * 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 io.github.tonywasher.joceanus.gordianknot.impl.bc.keypair;
  
  import io.github.tonywasher.joceanus.gordianknot.api.base.GordianException;
  import io.github.tonywasher.joceanus.gordianknot.impl.bc.keypair.BouncyKeyPairGenerator.BouncyKeyFactorySet;
  import io.github.tonywasher.joceanus.gordianknot.impl.core.exc.GordianCryptoException;
  import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
  import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
  import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
  import org.bouncycastle.crypto.util.PrivateKeyFactory;
  import org.bouncycastle.crypto.util.PrivateKeyInfoFactory;
  import org.bouncycastle.crypto.util.PublicKeyFactory;
  import org.bouncycastle.crypto.util.SubjectPublicKeyInfoFactory;
  
  import java.io.IOException;
  import java.security.spec.PKCS8EncodedKeySpec;
  import java.security.spec.X509EncodedKeySpec;
  
  /**
   * Standard KeyFactorySet.
   */
  public enum BouncyStdKeyFactorySet
          implements BouncyKeyFactorySet {
      /**
       * Instance.
       */
      INSTANCE;
  
      @Override
      public AsymmetricKeyParameter parsePKCS8EncodedKeySpec(final PKCS8EncodedKeySpec pEncodedKey) throws GordianException {
          /* Protect against exceptions */
          try {
              /* Parse the encoded keySpec */
              final PrivateKeyInfo myInfo = PrivateKeyInfo.getInstance(pEncodedKey.getEncoded());
              return PrivateKeyFactory.createKey(myInfo);
  
          } catch (IOException e) {
              throw new GordianCryptoException(BouncyKeyPairGenerator.ERROR_PARSE, e);
          }
      }
  
      @Override
      public PKCS8EncodedKeySpec createPKCS8EncodedKeySpec(final AsymmetricKeyParameter pParams) throws GordianException {
          /* Protect against exceptions */
          try {
              /* build and return the encoding */
              final PrivateKeyInfo myInfo = PrivateKeyInfoFactory.createPrivateKeyInfo(pParams, null);
              return new PKCS8EncodedKeySpec(myInfo.getEncoded());
  
          } catch (IOException e) {
              throw new GordianCryptoException(BouncyKeyPairGenerator.ERROR_PARSE, e);
          }
      }
  
      @Override
      public AsymmetricKeyParameter parseX509EncodedKeySpec(final X509EncodedKeySpec pEncodedKey) throws GordianException {
          /* Protect against exceptions */
          try {
              /* Parse the encoded keySpec */
              final SubjectPublicKeyInfo myInfo = SubjectPublicKeyInfo.getInstance(pEncodedKey.getEncoded());
              return PublicKeyFactory.createKey(myInfo);
  
          } catch (IOException e) {
              throw new GordianCryptoException(BouncyKeyPairGenerator.ERROR_PARSE, e);
          }
      }
  
      @Override
      public X509EncodedKeySpec createX509EncodedKeySpec(final AsymmetricKeyParameter pParams) throws GordianException {
          /* Protect against exceptions */
          try {
              /* build and return the encoding */
              final SubjectPublicKeyInfo myInfo = SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(pParams);
              return new X509EncodedKeySpec(myInfo.getEncoded());
  
          } catch (IOException e) {
              throw new GordianCryptoException(BouncyKeyPairGenerator.ERROR_PARSE, e);
          }
      }
  }