Digests.java

/**
 * Copyright 2016 benjobs
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 org.opencron.common.utils;

import org.apache.commons.lang3.Validate;

import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
 * 支持SHA-1/MD5消息摘要的工具类.
 *
 * 返回ByteSource，可进一步被编码为Hex, Base64或UrlSafeBase64
 *
 * @author calvin
 */
public abstract class Digests {

    private static final String SHA1 = "SHA-1";
    private static final String MD5 = "MD5";

    private static SecureRandom random = new SecureRandom();

    /**
     * 对输入字符串进行sha1散列.
     */
    public static byte[] sha1(byte[] input) {
        return digest(input, SHA1, null, 1);
    }

    public static byte[] sha1(byte[] input, byte[] salt) {
        return digest(input, SHA1, salt, 1);
    }

    public static byte[] sha1(byte[] input, byte[] salt, int iterations) {
        return digest(input, SHA1, salt, iterations);
    }

    /**
     * 对字符串进行散列, 支持md5与sha1算法.
     */
    private static byte[] digest(byte[] input, String algorithm, byte[] salt, int iterations) {
        try {
            MessageDigest digest = MessageDigest.getInstance(algorithm);

            if (salt != null) {
                digest.update(salt);
            }

            byte[] result = digest.digest(input);

            for (int i = 1; i < iterations; i++) {
                digest.reset();
                result = digest.digest(result);
            }
            return result;
        } catch (GeneralSecurityException e) {
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * 生成随机的Byte[]作为salt.
     *
     * @param numBytes byte数组的大小
     */
    public static byte[] generateSalt(int numBytes) {
        Validate.isTrue(numBytes > 0, "numBytes argument must be a positive integer (1 or larger)", numBytes);

        byte[] bytes = new byte[numBytes];
        random.nextBytes(bytes);
        return bytes;
    }

    /**
     * 对文件进行md5散列.
     */
    public static byte[] md5(InputStream input) throws IOException {
        return digest(input, MD5);
    }

    /**
     * 对文件进行sha1散列.
     */
    public static byte[] sha1(InputStream input) throws IOException {
        return digest(input, SHA1);
    }

    private static byte[] digest(InputStream input, String algorithm) throws IOException {
        try {
            MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
            int bufferLength = 8 * 1024;
            byte[] buffer = new byte[bufferLength];
            int read = input.read(buffer, 0, bufferLength);

            while (read > -1) {
                messageDigest.update(buffer, 0, read);
                read = input.read(buffer, 0, bufferLength);
            }

            return messageDigest.digest();
        } catch (GeneralSecurityException e) {
            throw Exceptions.unchecked(e);
        }
    }

    public static String sha1(String decript) {
        try {
            MessageDigest digest = MessageDigest
                    .getInstance("SHA-1");
            digest.update(decript.getBytes());
            byte messageDigest[] = digest.digest();
            // Create Hex String
            StringBuffer hexString = new StringBuffer();
            // 字节数组转换为 十六进制 数
            for (int i = 0; i < messageDigest.length; i++) {
                String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                if (shaHex.length() < 2) {
                    hexString.append(0);
                }
                hexString.append(shaHex);
            }
            return hexString.toString();

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }
}