java - RSA 解密错误 BadPaddingException

Question

我正在使用对称 key (AES)加密文件，然后使用 rsa key 加密 key 。 加密工作正常，但在解密时出现错误: 这是堆栈跟踪: http://pastebin.com/37AB7EPH

我已经尝试了一切，请帮助我，谢谢。

@RequestMapping(value= "/{userId}/uploadresource/{userEmail:.*}", method = RequestMethod.POST )
@ResponseBody
public void GetResourcesByUser(@PathVariable("userId") int UserId, @PathVariable("userEmail") String userEmail,  HttpServletRequest request, @RequestParam MultipartFile file ) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, IOException{
    Users recieverUser =userService.GetUserByEmail(userEmail);
    Users senderUser= userService.getUserById(UserId);
    int receiverUserId = recieverUser.getUser_id();
    Profile receiverProfile = userService.getUserProfile(receiverUserId);
    byte[] receiverPublicKey=receiverProfile.getPublicKey();
    PublicKey testPubKey=X509CertificateGenerator.encodedByteToPublicKey(receiverPublicKey);            

    KeyGenerator keyGen = KeyGenerator.getInstance("AES");
    keyGen.init(192); // for example
    SecretKey secretKey = keyGen.generateKey();

    byte[] secretKeyEncoded= secretKey.getEncoded();

    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    byte[] cipherData = cipher.doFinal(file.getBytes());

    Cipher cipher1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher1.init(Cipher.ENCRYPT_MODE, testPubKey);
    byte[] aesKeyEncryptedBytes = cipher.doFinal(secretKeyEncoded); 


    String senderUserName= senderUser.getUser_email();          
    AsymetricSharing sharing= new AsymetricSharing();

    sharing.setReceiverId(receiverUserId);
    sharing.setResourceFile(cipherData);
    sharing.setResourceName(file.getOriginalFilename());
    sharing.setSenderId(senderUser.getUser_id());
    sharing.setSenderName(senderUserName);
    sharing.setSymetricKey(aesKeyEncryptedBytes);

    resourseService.uploadAsymmetricResource(sharing);      
    //resources=this.resourseService.GetResourcesInGroup(group_id);     
}

解密 Asmmetric 文件...

@RequestMapping(value="/{userId}/downloadfile/{sharingId}", method = RequestMethod.GET, produces="application/json")
    public ResponseEntity<?> downloadAsymmetricFile(@PathVariable("sharingId") int sharingId, @PathVariable("userId") int userId, HttpServletResponse response) throws IOException, SQLException, InvalidKeyException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException {     

    AsymetricSharing file= resourseService.getFile(sharingId);

    if(file!=null){ 
        Profile receiverProfile=  userService.getUserProfile(userId);

        byte [] receiverPrivateKey=receiverProfile.getPrivateKey();         

        PrivateKey testPvtKey=Converter.encodedByteToKey(receiverPrivateKey);

        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, testPvtKey);

        byte[] symetricKeyBytes = cipher.doFinal(file.getSymetricKey());    

        SecretKey symetricKey = new SecretKeySpec(symetricKeyBytes, "AES");

        Cipher cipher1 = Cipher.getInstance("AES");
        cipher1.init(Cipher.DECRYPT_MODE, symetricKey);
        byte[] plainText = cipher.doFinal(file.getResourceFile());

        response.setContentLength(plainText.length);
        response.setHeader("Content-Disposition","attachment; filename=\"" + file.getResourceName() +"\"");
        FileCopyUtils.copy(plainText, response.getOutputStream());
        return new ResponseEntity<>(file, HttpStatus.OK);
    }
    else
    {
        //if no entity present against id, return not found and bad request Http status.
        return new ResponseEntity<>("Not found", HttpStatus.BAD_REQUEST);
    }
}

Answer 1

Cipher cipher = Cipher.getInstance("RSA");

解密时没有填充 RSA(如 RSA/ECB/NoPadding)。尝试将其更改为与加密中相同的值(“RSA/ECB/PKCS1Padding”)。 RSA 加密值也可以取消填充，如果我不清楚，请原谅我的英语:/