org.dromara.hutool.crypto.symmetric.ZUC Maven / Gradle / Ivy
/*
* Copyright (c) 2013-2024 Hutool Team and hutool.cn
*
* Licensed 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.
*/
package org.dromara.hutool.crypto.symmetric;
import org.dromara.hutool.core.util.RandomUtil;
import org.dromara.hutool.crypto.KeyUtil;
import javax.crypto.spec.IvParameterSpec;
/**
* 祖冲之算法集（ZUC算法）实现，基于BouncyCastle实现。
*
* @author looly
* @since 5.7.12
*/
public class ZUC extends SymmetricCrypto {
private static final long serialVersionUID = 1L;
/**
* 生成ZUC算法密钥
*
* @param algorithm ZUC算法
* @return 密钥
*
* @see KeyUtil#generateKey(String)
*/
public static byte[] generateKey(final ZUCAlgorithm algorithm) {
return KeyUtil.generateKey(algorithm.value).getEncoded();
}
/**
* 构造
*
* @param algorithm ZUC算法枚举，包括128位和256位两种
* @param key 密钥
* @param iv 加盐，128位加盐是16bytes，256位是25bytes，{@code null}是随机加盐
*/
public ZUC(final ZUCAlgorithm algorithm, final byte[] key, final byte[] iv) {
super(algorithm.value,
KeyUtil.generateKey(algorithm.value, key),
generateIvParam(algorithm, iv));
}
/**
* ZUC类型，包括128位和256位
*
* @author looly
*/
public enum ZUCAlgorithm {
/**
* ZUC-128
*/
ZUC_128("ZUC-128"),
/**
* ZUC-256
*/
ZUC_256("ZUC-256");
private final String value;
/**
* 构造
*
* @param value 算法的字符串表示，区分大小写
*/
ZUCAlgorithm(final String value) {
this.value = value;
}
/**
* 获得算法的字符串表示形式
*
* @return 算法字符串
*/
public String getValue() {
return this.value;
}
}
/**
* 生成加盐参数
*
* @param algorithm ZUC算法
* @param iv 加盐，128位加盐是16bytes，256位是25bytes，{@code null}是随机加盐
* @return {@link IvParameterSpec}
*/
private static IvParameterSpec generateIvParam(final ZUCAlgorithm algorithm, byte[] iv){
if(null == iv){
switch (algorithm){
case ZUC_128:
iv = RandomUtil.randomBytes(16);
break;
case ZUC_256:
iv = RandomUtil.randomBytes(25);
break;
}
}
return new IvParameterSpec(iv);
}
}