基于RSA密钥的AES密钥加解密

Question

这是我的密码

public void sendMessage(User receiver, String message) throws Exception {

    //Generate AES key for encrypt message
    KeyGenerator keyGenerator=KeyGenerator.getInstance("AES");
    Integer keyBitSize=256;
    keyGenerator.init(keyBitSize);
    SecretKey simKey=keyGenerator.generateKey();
    System.out.println("AES KEY: "+simKey.getEncoded()+"\n");

    //Encrypt message
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, simKey);
    byte[] encMess1=cipher.doFinal(message.getBytes("UTF-8"));
    String messToWrite=Base64.getEncoder().encodeToString(encMess1);

    //Encrypt AES key
    byte[] KeyToEnc=simKey.getEncoded();
    cipher=Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher.init(Cipher.ENCRYPT_MODE, receiver.getPub());
    cipher.update(KeyToEnc);
    byte[] AESEncWrt=cipher.doFinal();
    String aeskeyString=new String(Base64.getEncoder().encodeToString(AESEncWrt));
    System.out.println("AES ENC:"+aeskeyString+"\n");

    //Decrypt AES key
    byte[] KeyToDec=Base64.getDecoder().decode(aeskeyString.getBytes());
    cipher.init(Cipher.DECRYPT_MODE, receiver.getPriv());
    cipher.update(KeyToDec);
    byte[] decAesKey=cipher.doFinal();
    System.out.println("AES DEC: "+decAesKey+"\n");


    //Write message and AES key in file
    BufferedWriter messFile=new BufferedWriter(new FileWriter(receiver.getInbox()+"/"+getUsername()+".txt"));
    System.out.println("WRITING TO FILE:"+messToWrite+"\n");
    messFile.write(messToWrite);
    messFile.close();
    BufferedWriter aeswrite=new BufferedWriter(new FileWriter(receiver.getInbox()+"/"+getUsername()+"key.txt"));
    System.out.println("WRT KEY:"+aeskeyString+"\n");
    aeswrite.write(aeskeyString);
    aeswrite.close();

    System.out.println("-------------------------------");
}

抱歉，如果我的代码一团糟。

Answer 1

当您执行此操作时：

System.out.println("AES KEY: "+simKey.getEncoded()+"\n");

您不打印键的内容，而只是一个指向字节数组的“指针”。解密时，您将得到一个带有不同“指针”的新字节[]。

您需要打印实际内容，例如十六进制。Java对十六进制打印的支持有限，但类似的内容将为您提供字节数组的十六进制表示：

System.out.println(new BigInteger(1, simKey.getEncoded()).toString(16));