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  package org.apache.cayenne.crypto.transformer.value;
  
  import org.apache.cayenne.crypto.transformer.bytes.BytesEncryptor;
  
  /**
   * @since 4.0
   */
  class DefaultValueEncryptor implements ValueEncryptor {
  
      private BytesConverter preConverter;
      private BytesConverter postConverter;
  
      public DefaultValueEncryptor(BytesConverter preConverter, BytesConverter postConverter) {
          this.preConverter = preConverter;
          this.postConverter = postConverter;
      }
  
      BytesConverter getPreConverter() {
          return preConverter;
      }
  
      BytesConverter getPostConverter() {
          return postConverter;
      }
  
      @Override
      public Object encrypt(BytesEncryptor encryptor, Object value) {
  
          // TODO: should we encrypt nulls as well to hide NULL from attackers?
          if (value == null) {
              return null;
          }
  
          @SuppressWarnings("unchecked")
          byte[] bytes = preConverter.toBytes(value);
          byte[] transformed = encryptor.encrypt(bytes, 0, new byte[1]);
          return postConverter.fromBytes(transformed);
      }
  
  }
  