rsa/ecb/pkcs1padding java code

以下是加密和解密的Java代码，使用RSA算法，ECB模式和PKCS1Padding填充。

import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import javax.crypto.Cipher;
public class RSAEncryption {
    public static void main(String[] args) throws Exception {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(2048);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        Key publicKey = keyPair.getPublic();
        Key privateKey = keyPair.getPrivate();
        String message = "This is the message to be encrypted.";
        byte[] messageBytes = message.getBytes();
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] encryptedMessageBytes = cipher.doFinal(messageBytes);
        System.out.println("Encrypted message: " + new String(encryptedMessageBytes));
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import javax.crypto.Cipher;
public class RSADecryption {
    public static void main(String[] args) throws Exception {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(2048);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        Key publicKey = keyPair.getPublic();
        Key privateKey = keyPair.getPrivate();
        byte[] encryptedMessageBytes = ...;
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] decryptedMessageBytes = cipher.doFinal(encryptedMessageBytes);
        System.out.println("Decrypted message: " + new String(decryptedMessageBytes));
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