content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.camel.quarkus.component.crypto.pgp.deployment;
  
  import java.lang.reflect.Field;
  import java.util.ArrayList;
  import java.util.List;
  
  import io.quarkus.deployment.annotations.BuildStep;
  import io.quarkus.deployment.builditem.FeatureBuildItem;
  import io.quarkus.logging.Log;
  import org.apache.camel.quarkus.support.bouncycastle.deployment.CipherTransformationBuildItem;
  import org.bouncycastle.bcpg.SymmetricKeyAlgorithmTags;
  import org.bouncycastle.openpgp.PGPUtil;
  
  class CryptoPgpProcessor {
  
      private static final String FEATURE = "camel-crypto-pgp";
  
      @BuildStep
      FeatureBuildItem feature() {
          return new FeatureBuildItem(FEATURE);
      }
  
      @BuildStep
      CipherTransformationBuildItem registerReachableCipherTransformations() {
          List<String> cipherTransformations = new ArrayList<>();
          for (Field field : SymmetricKeyAlgorithmTags.class.getDeclaredFields()) {
              try {
                  String algorithmName = PGPUtil.getSymmetricCipherName(field.getInt(null));
                  if (algorithmName != null) {
                      String format = "Adding transformation '%s' to the CipherTransformationBuildItem produced by camel-quarkus-crypto";
  
                      // When using integrity packet, CFB mode is reachable
                      String cfbTransformation = algorithmName + "/CFB/NoPadding";
                      Log.debugf(format, cfbTransformation);
                      cipherTransformations.add(cfbTransformation);
  
                      // When NOT using integrity packet, OpenPGPCFB mode is reachable
                      String openPgpCfbTransformation = algorithmName + "/OpenPGPCFB/NoPadding";
                      Log.debugf(format, openPgpCfbTransformation);
                      cipherTransformations.add(openPgpCfbTransformation);
                  }
              } catch (IllegalArgumentException | IllegalAccessException e) {
                  // Ignoring inaccessible and non integer fields
              }
          }
  
          return new CipherTransformationBuildItem(cipherTransformations);
      }
  }
  