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package cn.hutool.crypto.symmetric;

import cn.hutool.core.util.RandomUtil;
import cn.hutool.crypto.KeyUtil;

import javax.crypto.spec.IvParameterSpec;

/**
 * ChaCha20算法实现
* ChaCha系列流密码,作为salsa密码的改良版,具有更强的抵抗密码分析攻击的特性,“20”表示该算法有20轮的加密计算。 * * @author looly * @since 5.7.12 */ public class ChaCha20 extends SymmetricCrypto { private static final long serialVersionUID = 1L; public static final String ALGORITHM_NAME = "ChaCha20"; /** * 构造 * * @param key 密钥 * @param iv 加盐,12bytes(64bit) */ public ChaCha20(byte[] key, byte[] iv) { super(ALGORITHM_NAME, KeyUtil.generateKey(ALGORITHM_NAME, key), generateIvParam(iv)); } /** * 生成加盐参数 * * @param iv 加盐 * @return {@link IvParameterSpec} */ private static IvParameterSpec generateIvParam(byte[] iv) { if (null == iv) { iv = RandomUtil.randomBytes(12); } return new IvParameterSpec(iv); } }




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