使用java代码写RSA+AES请假加密

以下是Java代码实现RSA AES加密：

RSA加密：

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;

import javax.crypto.Cipher;

public class RSAEncryption {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

        // 生成RSA密钥对
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA", "BC");
        keyPairGen.initialize(2048);
        KeyPair keyPair = keyPairGen.generateKeyPair();
        PublicKey publicKey = keyPair.getPublic();
        PrivateKey privateKey = keyPair.getPrivate();

        // 加密数据
        String plainText = "请假申请";
        Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "BC");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] cipherText = cipher.doFinal(plainText.getBytes());

        // 解密数据
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] decryptedText = cipher.doFinal(cipherText);

        System.out.println("原始数据：" + plainText);
        System.out.println("加密后数据：" + new String(cipherText));
        System.out.println("解密后数据：" + new String(decryptedText));
    }
}

AES加密：

import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

public class AESEncryption {
    private static final int AES_KEY_SIZE = 128;

    public static void main(String[] args) throws Exception {
        // 生成AES密钥
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(AES_KEY_SIZE, new SecureRandom());
        Key aesKey = keyGen.generateKey();

        // 加密数据
        String plainText = "请假申请";
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, aesKey);
        byte[] cipherText = cipher.doFinal(plainText.getBytes());

        // 解密数据
        cipher.init(Cipher.DECRYPT_MODE, aesKey);
        byte[] decryptedText = cipher.doFinal(cipherText);

        System.out.println("原始数据：" + plainText);
        System.out.println("加密后数据：" + new String(cipherText));
        System.out.println("解密后数据：" + new String(decryptedText));
    }
}

将RSA和AES结合使用，可以先用RSA加密AES密钥，然后使用AES加密数据，最后将加密后的AES密钥和加密后的数据一起发送。解密时，先使用RSA解密AES密钥，然后使用解密后的AES密钥解密数据。