如何在Java中解密ByteArrayOutputStream？

Question

我正试图解密一个从Azure存储中下载为ByteArrayOutputStream的文件。

我有一个类型为ByteArrayOutputStream的流。我如何解密它并返回解密的ByteArrayOutputStream？

我尝试过使用CipherOutputStream，但我不确定如何使用它。

cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(INITIALIZATIO_VECTOR.getBytes("UTF-8")));
blob.upload(new CipherInputStream(file.getInputStream(), cipher), file.getSize());

public ByteArrayOutputStream download(String fileName, Long id) {
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    
    try {
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
        SecretKeySpec key = new SecretKeySpec(encrypkey.getBytes("UTF-8"), "AES");
        cipher.init(Cipher.DECRYPT_MODE, key,new IvParameterSpec(INITIALIZATIO_VECTOR.getBytes("UTF-8")));
        CipherOutputStream output = null;
          
        container = getBlobClient().getContainerReference("container" + id.toString());
        
        CloudBlockBlob blob = container.getBlockBlobReference(fileName);

        if (blob.exists()) {
            blob.download(os);
            //output = new CipherOutputStream(outputStream, cipher);        
        } else {
            logger.info("File does not exists on azure container");
        }
    } catch (StorageException e) {
        logger.error("StorageException : {}" + e.getLocalizedMessage(), e);
    } catch (Exception e) {
        logger.error("Exception : {}" + e.getLocalizedMessage(), e);
    }
    
    return os;
}

Answer 1

首先创建CipherOutputStream，然后将blob下载到该输出中：

output = new CipherOutputStream(os, cipher);
blob.download(output);