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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.provider;

import org.aoju.bus.core.lang.exception.InstrumentException;
import org.aoju.bus.core.toolkit.HexKit;
import org.aoju.bus.core.toolkit.StringKit;
import org.aoju.bus.crypto.Builder;
import org.aoju.bus.crypto.Provider;
import org.aoju.bus.crypto.symmetric.Symmetric;

/**
 * 高级加密标准,是下一代的加密算法标准,速度快,安全级别高；
 * AES是一个使用128为分组块的分组加密算法,分组块和128、192或256位的密钥一起作为输入,
 * 对4×4的字节数组上进行操作 众所周之AES是种十分高效的算法,尤其在8位架构中,这源于它面向字节的设计
 * AES 适用于8位的小型单片机或者普通的32位微处理器,并且适合用专门的硬件实现,硬件实现能够使其吞吐量(每秒可以到达的加密/解密bit数)
 * 达到十亿量级
 *
 * @author Kimi Liu
 * @version 6.1.1
 * @since JDK 1.8+
 */
public class SM4Provider implements Provider {

    /**
     * 加密
     *
     * @param key     密钥
     * @param content 需要加密的内容
     */
    @Override
    public byte[] encrypt(String key, byte[] content) {
        if (StringKit.isEmpty(key)) {
            throw new InstrumentException("key is null!");
        }
        Symmetric sm4 = Builder.sm4(HexKit.decodeHex(key));
        return sm4.encrypt(content);
    }

    /**
     * 解密
     *
     * @param key     密钥
     * @param content 需要解密的内容
     */
    @Override
    public byte[] decrypt(String key, byte[] content) {
        if (StringKit.isEmpty(key)) {
            throw new InstrumentException("key is null!");
        }
        Symmetric sm4 = Builder.sm4(HexKit.decodeHex(key));
        return sm4.decrypt(content);
    }

}