def encrypt_file(file, keys=secretKeys()):
    '''Encrypt file data with the same method as the Send browser/js client'''
    key = keys.encryptKey
    iv = keys.encryptIV
    encData = tempfile.SpooledTemporaryFile(max_size=SPOOL_SIZE, mode='w+b')
    cipher = Cryptodome.Cipher.AES.new(key, Cryptodome.Cipher.AES.MODE_GCM, iv)

    pbar = progbar(fileSize(file))

    for chunk in iter(lambda: file.read(CHUNK_SIZE), b''):
        encData.write(cipher.encrypt(chunk))
        pbar.update(len(chunk))

    pbar.close()
    encData.write(cipher.digest())
    file.close()

    encData.seek(0)
    return encData
Encrypt file data with the same method as the Send browser/js client