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init_packet_pb.py
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init_packet_pb.py
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from __future__ import absolute_import
#
# Copyright (c) 2016 Nordic Semiconductor ASA
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice, this
# list of conditions and the following disclaimer in the documentation and/or
# other materials provided with the distribution.
#
# 3. Neither the name of Nordic Semiconductor ASA nor the names of other
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# 4. This software must only be used in or with a processor manufactured by Nordic
# Semiconductor ASA, or in or with a processor manufactured by a third party that
# is used in combination with a processor manufactured by Nordic Semiconductor.
#
# 5. Any software provided in binary or object form under this license must not be
# reverse engineered, decompiled, modified and/or disassembled.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
from . import dfu_cc_pb2 as pb
from enum import Enum
class SigningTypes(Enum):
ECDSA_P256_SHA256 = pb.ECDSA_P256_SHA256
ED25519 = pb.ED25519
class CommandTypes(Enum):
RESET = pb.RESET
INIT = pb.INIT
class HashTypes(Enum):
NONE = pb.NO_HASH
CRC = pb.CRC
SHA128 = pb.SHA128
SHA256 = pb.SHA256
SHA512 = pb.SHA512
class DFUType(Enum):
APPLICATION = pb.APPLICATION
SOFTDEVICE = pb.SOFTDEVICE
BOOTLOADER = pb.BOOTLOADER
SOFTDEVICE_BOOTLOADER = pb.SOFTDEVICE_BOOTLOADER
class InitPacketPB(object):
def __init__(self,
from_bytes = None,
hash_bytes = None,
hash_type = None,
dfu_type = None,
is_debug=False,
fw_version=0xffffffff,
hw_version=0xffffffff,
sd_size=0,
app_size=0,
bl_size=0,
sd_req=None
):
if from_bytes is not None:
# construct from a protobuf string/buffer
self.packet = pb.Packet()
self.packet.ParseFromString(from_bytes)
if self.packet.HasField('signed_command'):
self.init_command = self.packet.signed_command.command.init
else:
self.init_command = self.packet.command.init
else:
# construct from input variables
if not sd_req:
sd_req = [0xfffe] # Set to default value
self.packet = pb.Packet()
# By default, set the packet's command to an unsigned command
# If a signature is set (via set_signature), this will get overwritten
# with an instance of SignedCommand instead.
self.packet.command.op_code = pb.INIT
self.init_command = pb.InitCommand()
self.init_command.hash.hash_type = hash_type.value
self.init_command.type = dfu_type.value
self.init_command.hash.hash = hash_bytes
self.init_command.is_debug = is_debug
self.init_command.fw_version = fw_version
self.init_command.hw_version = hw_version
self.init_command.sd_req.extend(list(set(sd_req)))
self.init_command.sd_size = sd_size
self.init_command.bl_size = bl_size
self.init_command.app_size = app_size
self.packet.command.init.CopyFrom(self.init_command)
self._validate()
def _validate(self):
if self.init_command.type == pb.APPLICATION and self.init_command.app_size == 0:
raise RuntimeError("app_size is not set. It must be set when type is APPLICATION")
elif self.init_command.type == pb.SOFTDEVICE and self.init_command.sd_size == 0:
raise RuntimeError("sd_size is not set. It must be set when type is SOFTDEVICE")
elif self.init_command.type == pb.BOOTLOADER and self.init_command.bl_size == 0:
raise RuntimeError("bl_size is not set. It must be set when type is BOOTLOADER")
elif self.init_command.type == pb.SOFTDEVICE_BOOTLOADER and \
(self.init_command.sd_size == 0 or self.init_command.bl_size == 0):
raise RuntimeError("Either sd_size or bl_size is not set. Both must be set when type "
"is SOFTDEVICE_BOOTLOADER")
if self.init_command.fw_version < 0 or self.init_command.fw_version > 0xffffffff or \
self.init_command.hw_version < 0 or self.init_command.hw_version > 0xffffffff:
raise RuntimeError("Invalid range of firmware argument. [0 - 0xffffffff] is valid range")
def _is_valid(self):
try:
self._validate()
except RuntimeError:
return False
return self.signed_command.signature is not None
def get_init_packet_pb_bytes(self):
return self.packet.SerializeToString()
def get_init_command_bytes(self):
return self.init_command.SerializeToString()
def set_signature(self, signature, signature_type):
new_packet = pb.Packet()
new_packet.signed_command.signature = signature
new_packet.signed_command.signature_type = signature_type.value
new_packet.signed_command.command.CopyFrom(self.packet.command)
self.packet = new_packet
def __str__(self):
return str(self.init_command)