org.fastquery.httpsign.BinaryUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2016-2100, fastquery.org and/or its affiliates. All rights reserved.
*
* 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.
*
* For more information, please see http://www.fastquery.org/.
*
*/
package org.fastquery.httpsign;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
/**
* 字节编码工具
* @author [email protected]
*/
public class BinaryUtil {
private BinaryUtil() {
}
private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
/**
* 对字节数组进行Base64编码
* @param bytes 待编码的字节数组
* @return Base64字符串
*/
public static String toBase64String(byte ... bytes) {
return Base64.getEncoder().encodeToString(bytes);
}
/**
* 将Base64字符串解码成字节数组
* @param base64String 待解码的Base64字符串
* @return 字节数组
*/
public static byte[] fromBase64String(String base64String) {
return Base64.getDecoder().decode(base64String);
}
/**
* 算出字节数组的md5
* @param bytes 待计算的字节数组
* @return md5结果(字节形式)
* @throws NoSuchAlgorithmException 没有找到匹配的算法
*/
public static byte[] calculateMd5(byte ... bytes) throws NoSuchAlgorithmException {
MessageDigest messageDigest = null;
messageDigest = MessageDigest.getInstance("MD5");
messageDigest.update(bytes);
return messageDigest.digest();
}
/**
* 算出字节数组的md5
* @param bytes 待计算的字节数组
* @return md5结果(16进制字符串形式)
* @throws NoSuchAlgorithmException 没有找到匹配的算法
*/
public static String encodeMD5(byte ... bytes) throws NoSuchAlgorithmException {
byte[] md5Bytes = calculateMd5(bytes);
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);
}
}