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/*********************************************************************************
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 * The MIT License (MIT)                                                         *
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 * Copyright (c) 2015-2020 aoju.org and other contributors.                      *
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package org.aoju.bus.crypto.digest.mac;

import org.aoju.bus.core.lang.exception.InstrumentException;
import org.aoju.bus.core.toolkit.IoKit;
import org.aoju.bus.crypto.Builder;

import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.io.InputStream;
import java.security.Key;

/**
 * 默认的HMAC算法实现引擎，使用{@link Mac} 实现摘要
 * 当引入BouncyCastle库时自动使用其作为Provider
 *
 * @author Kimi Liu
 * @version 6.1.1
 * @since JDK 1.8+
 */
public class DefaultHMacEngine implements MacEngine {

    private Mac mac;

    /**
     * 构造
     *
     * @param algorithm 算法
     * @param key       密钥
     */
    public DefaultHMacEngine(String algorithm, byte[] key) {
        init(algorithm, key);
    }

    /**
     * 构造
     *
     * @param algorithm 算法
     * @param key       密钥
     */
    public DefaultHMacEngine(String algorithm, Key key) {
        init(algorithm, key);
    }

    /**
     * 初始化
     *
     * @param algorithm 算法
     * @param key       密钥
     * @return this
     */
    public DefaultHMacEngine init(String algorithm, byte[] key) {
        return init(algorithm, (null == key) ? null : new SecretKeySpec(key, algorithm));
    }

    /**
     * 初始化
     *
     * @param algorithm 算法
     * @param key       密钥 {@link SecretKey}
     * @return this
     * @throws InstrumentException Cause by IOException
     */
    public DefaultHMacEngine init(String algorithm, Key key) {
        try {
            mac = Builder.createMac(algorithm);
            if (null == key) {
                key = Builder.generateKey(algorithm);
            }
            mac.init(key);
        } catch (Exception e) {
            throw new InstrumentException(e);
        }
        return this;
    }

    @Override
    public byte[] digest(InputStream data, int bufferLength) {
        if (bufferLength < 1) {
            bufferLength = IoKit.DEFAULT_BUFFER_SIZE;
        }
        byte[] buffer = new byte[bufferLength];

        byte[] result;
        try {
            int read = data.read(buffer, 0, bufferLength);

            while (read > -1) {
                mac.update(buffer, 0, read);
                read = data.read(buffer, 0, bufferLength);
            }
            result = mac.doFinal();
        } catch (IOException e) {
            throw new InstrumentException(e);
        } finally {
            mac.reset();
        }
        return result;
    }

    /**
     * 获得 {@link Mac}
     *
     * @return {@link Mac}
     */
    public Mac getMac() {
        return mac;
    }

    @Override
    public int getMacLength() {
        return mac.getMacLength();
    }

    @Override
    public String getAlgorithm() {
        return this.mac.getAlgorithm();
    }

}