love.sola.netsupport.util.RSAUtil.java Source code

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Here is the source code for love.sola.netsupport.util.RSAUtil.java

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/*
 * This file is part of WechatTicketSystem.
 *
 * WechatTicketSystem is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * WechatTicketSystem is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with WechatTicketSystem.  If not, see <http://www.gnu.org/licenses/>.
 */

package love.sola.netsupport.util;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;

/**
 * @author Sola {@literal <dev@sola.love>}
 */
public class RSAUtil {

    public static Key publicKey;
    public static Key privateKey;
    public static String publicKey_s;
    public static String privateKey_s;

    static {
        genKeyPair();
    }

    public static void genKeyPair() {
        try {
            KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
            kpg.initialize(1024);
            KeyPair kp = kpg.genKeyPair();
            publicKey = kp.getPublic();
            privateKey = kp.getPrivate();
            publicKey_s = Base64.encodeBase64String(publicKey.getEncoded());
            privateKey_s = Base64.encodeBase64String(privateKey.getEncoded());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String encrypt(String value) {
        try {
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            byte[] encrypted = cipher.doFinal(value.getBytes(StandardCharsets.UTF_8));
            return Base64.encodeBase64String(encrypted);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    public static String decrypt(String encrypted) {
        try {
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));
            return new String(original, StandardCharsets.UTF_8);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

}