java生成RSA的密匙对

import org.bouncycastle.openssl.jcajce.JcaPEMWriter;

import java.io.FileWriter;
import java.io.IOException;
import java.security.*;

public class RSAKeyGenerator {
    //密码加密位数
    private static final int KEY_SIZE = 2048;

    public static void main(String[] args) {
        try {
            // 添加Bouncy Castle作为安全提供程序
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

            // 生成RSA密钥对
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA", "BC");
            keyPairGenerator.initialize(KEY_SIZE);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();

            // 将私钥保存到.pem文件
            saveKeyToPemFile(keyPair.getPrivate(), "private.pem");

            // 将公钥保存到.pem文件
            saveKeyToPemFile(keyPair.getPublic(), "public.pem");

            System.out.println("RSA密钥对已生成并保存到.pem文件中。");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void saveKeyToPemFile(Key key, String filename) throws IOException {
        try (JcaPEMWriter pemWriter = new JcaPEMWriter(new FileWriter(filename))) {
            pemWriter.writeObject(key);
        }
    }
}