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 com.aliyun.oss.common.utils;
  
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  
  import org.apache.commons.codec.binary.Base64;
  import org.apache.commons.codec.binary.Hex;
  
  public class BinaryUtil {
  
      private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
              'E', 'F' };
  
      public static String toBase64String(byte[] binaryData) {
          return new String(Base64.encodeBase64(binaryData));
      }
  
      public static byte[] fromBase64String(String base64String) {
          return Base64.decodeBase64(base64String);
      }
  
      public static byte[] calculateMd5(byte[] binaryData) {
          MessageDigest messageDigest = null;
          try {
              messageDigest = MessageDigest.getInstance("MD5");
          } catch (NoSuchAlgorithmException e) {
              throw new RuntimeException("MD5 algorithm not found.");
          }
          messageDigest.update(binaryData);
          return messageDigest.digest();
      }
  
      public static String encodeMD5(byte[] binaryData) {
          byte[] md5Bytes = calculateMd5(binaryData);
          int len = md5Bytes.length;
          char buf[] = new char[len * 2];
          for (int i = 0; i < len; i++) {
              buf[i * 2] = HEX_DIGITS[(md5Bytes[i] >>> 4) & 0x0f];
              buf[i * 2 + 1] = HEX_DIGITS[md5Bytes[i] & 0x0f];
          }
          return new String(buf);
      }
  
      public static byte[] calculateSha256(byte[] binaryData) {
          MessageDigest messageDigest = null;
          try {
              messageDigest = MessageDigest.getInstance("SHA-256");
          } catch (NoSuchAlgorithmException e) {
              throw new RuntimeException("SHA-256 algorithm not found.");
          }
          messageDigest.update(binaryData);
          return messageDigest.digest();
      }
  
      /**
       * Converts byte data to a Hex-encoded string in lower case.
       *
       * @param data
       *            data to hex encode.
       *
       * @return hex-encoded string.
       */
      public static String toHex(byte[] data) {
          return Hex.encodeHexString(data);
      }
  }
  