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[2.0.7]pxc framework crypto 加密解密模块
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/*
 * Copyright © 2022-2024 Lypxc ([email protected])
 *
 * 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 io.github.panxiaochao.crypto.utils;

import org.apache.commons.lang3.StringUtils;

import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;

/**
 * 
 * KeyPair 密钥生成工具.
 * 
 *
 * @author Lypxc
 * @since 2022-12-14
 */
public class KeyGeneratorUtil {

	private static final String ALGORITHM_RSA = "RSA";

	private static final int DEFAULT_KEY_SIZE = 2048;

	private KeyGeneratorUtil() {
	}

	public static KeyPair generateRsaKeyPair() {
		return generateRsaKeyPair(null);
	}

	public static KeyPair generateRsaKeyPair(String seed) {
		return generateKeyPair(ALGORITHM_RSA, seed);
	}

	private static KeyPair generateKeyPair(String algorithm, String seed) {
		KeyPair keyPair;
		try {
			KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(algorithm);
			if (StringUtils.isNotBlank(seed)) {
				SecureRandom secureRandom = new SecureRandom(seed.getBytes());
				keyPairGenerator.initialize(DEFAULT_KEY_SIZE, secureRandom);
			}
			else {
				keyPairGenerator.initialize(DEFAULT_KEY_SIZE);
			}
			keyPair = keyPairGenerator.generateKeyPair();
		}
		catch (Exception ex) {
			throw new IllegalStateException(ex);
		}
		return keyPair;
	}

	public static KeyPair generateEcKey() {
		EllipticCurve ellipticCurve = new EllipticCurve(
				new ECFieldFp(new BigInteger(
						"115792089210356248762697446949407573530086143415290314195533631308867097853951")),
				new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853948"),
				new BigInteger("41058363725152142129326129780047268409114441015993725554835256314039467401291"));

		ECPoint ecPoint = new ECPoint(
				new BigInteger("48439561293906451759052585252797914202762949526041747995844080717082404635286"),
				new BigInteger("36134250956749795798585127919587881956611106672985015071877198253568414405109"));

		ECParameterSpec ecParameterSpec = new ECParameterSpec(ellipticCurve, ecPoint,
				new BigInteger("115792089210356248762697446949407573529996955224135760342422259061068512044369"), 1);

		KeyPair keyPair;
		try {
			KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
			keyPairGenerator.initialize(ecParameterSpec);
			keyPair = keyPairGenerator.generateKeyPair();
		}
		catch (Exception ex) {
			throw new IllegalStateException(ex);
		}
		return keyPair;
	}

}