Menyulitkan dan menyahsulit data borang menggunakan Java

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

public class RSAKeyPairGenerator {
    public static void main(String[] args) {
        try {
            // 使用RSA算法生成密钥对
            KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
            keyGen.initialize(2048); // 设置密钥长度为2048位
            KeyPair keyPair = keyGen.generateKeyPair();

            // 获取公钥和私钥
            String publicKey = keyPair.getPublic().toString();
            String privateKey = keyPair.getPrivate().toString();

            System.out.println("公钥：" + publicKey);
            System.out.println("私钥：" + privateKey);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }
}

import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import org.apache.commons.codec.binary.Base64;

public class RSAEncryptDecrypt {
    // 将Base64编码后的公钥字符串转换为PublicKey对象
    public static PublicKey getPublicKey(String publicKeyStr) throws Exception {
        byte[] publicKeyBytes = Base64.decodeBase64(publicKeyStr);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        return keyFactory.generatePublic(keySpec);
    }

    // 将Base64编码后的私钥字符串转换为PrivateKey对象
    public static PrivateKey getPrivateKey(String privateKeyStr) throws Exception {
        byte[] privateKeyBytes = Base64.decodeBase64(privateKeyStr);
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        return keyFactory.generatePrivate(keySpec);
    }

    // 使用公钥加密数据
    public static String encrypt(String plainText, PublicKey publicKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
        return Base64.encodeBase64String(encryptedBytes);
    }

    // 使用私钥解密数据
    public static String decrypt(String encryptedText, PrivateKey privateKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] decryptedBytes = cipher.doFinal(Base64.decodeBase64(encryptedText));
        return new String(decryptedBytes, StandardCharsets.UTF_8);
    }

    public static void main(String[] args) {
        try {
            String publicKeyStr = "YOUR_PUBLIC_KEY";
            String privateKeyStr = "YOUR_PRIVATE_KEY";
            String plainText = "Hello, World!";
            
            // 将公钥字符串转换为PublicKey对象
            PublicKey publicKey = getPublicKey(publicKeyStr);
            
            // 将私钥字符串转换为PrivateKey对象
            PrivateKey privateKey = getPrivateKey(privateKeyStr);

            // 使用公钥加密数据
            String encryptedText = encrypt(plainText, publicKey);
            System.out.println("加密后的数据：" + encryptedText);

            // 使用私钥解密数据
            String decryptedText = decrypt(encryptedText, privateKey);
            System.out.println("解密后的数据：" + decryptedText);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}