/*
    * GordianKnot: Security Suite
    * Copyright 2012-2026. 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;
  
  import io.github.tonywasher.joceanus.gordianknot.impl.core.digest.GordianCoreDigest;
  import io.github.tonywasher.joceanus.gordianknot.impl.core.spec.digest.GordianCoreDigestSpec;
  import org.bouncycastle.crypto.Digest;
  
  /**
   * BouncyCastle Digest.
   */
  public class BouncyDigest
          extends GordianCoreDigest {
      /**
       * Digest.
       */
      private final Digest theDigest;
  
      /**
       * Constructor.
       *
       * @param pDigestSpec the digestSpec
       * @param pDigest     the digest
       */
      BouncyDigest(final GordianCoreDigestSpec pDigestSpec,
                   final Digest pDigest) {
          super(pDigestSpec);
          theDigest = pDigest;
      }
  
      /**
       * Obtain Underlying Digest.
       *
       * @return the underlying digest
       */
      Digest getDigest() {
          return theDigest;
      }
  
      @Override
      public int getDigestSize() {
          return getDigestSpec() != null
                  ? super.getDigestSize()
                  : theDigest.getDigestSize();
      }
  
      @Override
      public void doUpdate(final byte[] pBytes,
                           final int pOffset,
                           final int pLength) {
          theDigest.update(pBytes, pOffset, pLength);
      }
  
      @Override
      public void update(final byte pByte) {
          theDigest.update(pByte);
      }
  
      @Override
      public void reset() {
          theDigest.reset();
      }
  
      @Override
      public byte[] finish() {
          final byte[] myResult = new byte[getDigestSize()];
          doFinish(myResult, 0);
          return myResult;
      }
  
      @Override
      public int doFinish(final byte[] pBuffer,
                          final int pOffset) {
          return theDigest.doFinal(pBuffer, pOffset);
      }
  }