com.github.shepherdviolet.glacimon.java.crypto.base.BaseBCKeyGenerator Maven / Gradle / Ivy
/*
* Copyright (C) 2022-2022 S.Violet
*
* 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.
*
* Project GitHub: https://github.com/shepherdviolet/glacimon
* Email: [email protected]
*/
package com.github.shepherdviolet.glacimon.java.crypto.base;
import javax.crypto.KeyGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
/**
* [Bouncy castle]密钥生成基本逻辑
*
* Not recommended for direct use
*
* 不建议直接使用
*
* Cipher/Signature/MessageDigest线程不安全!!!
*
* @author shepherdviolet
*/
public class BaseBCKeyGenerator {
static {
BouncyCastleProviderUtils.installProvider();
}
/**
*
生成对称密钥, 用于服务端场合, 产生随机密钥
*
* @param secureRandom 如果需要产生随机密钥, 建议传入null, 采用系统内核熵作为种子更安全
* @param bits 密钥位数(128...)
* @param keyAlgorithm 密钥算法类型
* @return 密钥
*/
public static byte[] generateKey(SecureRandom secureRandom, int bits, String keyAlgorithm) {
KeyGenerator keyGenerator;
try {
keyGenerator = KeyGenerator.getInstance(keyAlgorithm, BouncyCastleProviderUtils.getProviderName());
} catch (NoSuchProviderException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e.getMessage(), e);
}
if (secureRandom != null) {
keyGenerator.init(bits, secureRandom);
} else {
keyGenerator.init(bits, BaseKeyGenerator.getSystemSecureRandom());
}
return keyGenerator.generateKey().getEncoded();
}
}