content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * 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.android.apksig.internal.apk;
  
  /**
   * APK Signature Scheme v2 content digest algorithm.
   */
  public enum ContentDigestAlgorithm {
      /** SHA2-256 over 1 MB chunks. */
      CHUNKED_SHA256("SHA-256", 256 / 8),
  
      /** SHA2-512 over 1 MB chunks. */
      CHUNKED_SHA512("SHA-512", 512 / 8),
  
      /** SHA2-256 over 4 KB chunks for APK verity. */
      VERITY_CHUNKED_SHA256("SHA-256", 256 / 8);
  
      private final String mJcaMessageDigestAlgorithm;
      private final int mChunkDigestOutputSizeBytes;
  
      private ContentDigestAlgorithm(
              String jcaMessageDigestAlgorithm, int chunkDigestOutputSizeBytes) {
          mJcaMessageDigestAlgorithm = jcaMessageDigestAlgorithm;
          mChunkDigestOutputSizeBytes = chunkDigestOutputSizeBytes;
      }
  
      /**
       * Returns the {@link java.security.MessageDigest} algorithm used for computing digests of
       * chunks by this content digest algorithm.
       */
      String getJcaMessageDigestAlgorithm() {
          return mJcaMessageDigestAlgorithm;
      }
  
      /**
       * Returns the size (in bytes) of the digest of a chunk of content.
       */
      int getChunkDigestOutputSizeBytes() {
          return mChunkDigestOutputSizeBytes;
      }
  }