139 lines
6.0 KiB
Python
139 lines
6.0 KiB
Python
"""
|
|
*******************************************************************************
|
|
* Ledger Blue
|
|
* (c) 2016 Ledger
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
********************************************************************************
|
|
"""
|
|
|
|
from .ecWrapper import PrivateKey, PublicKey
|
|
from .comm import getDongle
|
|
from .commException import CommException
|
|
from .hexParser import IntelHexParser
|
|
from .hexLoader import HexLoader
|
|
import argparse
|
|
import struct
|
|
import os
|
|
import binascii
|
|
|
|
def auto_int(x):
|
|
return int(x, 0)
|
|
|
|
def getDeployedSecretV2(dongle, masterPrivate, targetid):
|
|
testMaster = PrivateKey(bytes(masterPrivate))
|
|
testMasterPublic = bytearray(testMaster.pubkey.serialize(compressed=False))
|
|
targetid = bytearray(struct.pack('>I', targetid))
|
|
|
|
# identify
|
|
apdu = bytearray([0xe0, 0x04, 0x00, 0x00]) + bytearray([len(targetid)]) + targetid
|
|
dongle.exchange(apdu)
|
|
|
|
# walk the chain
|
|
nonce = os.urandom(8)
|
|
apdu = bytearray([0xe0, 0x50, 0x00, 0x00]) + bytearray([len(nonce)]) + nonce
|
|
auth_info = dongle.exchange(apdu)
|
|
batch_signer_serial = auth_info[0:4]
|
|
deviceNonce = auth_info[4:12]
|
|
|
|
# if not found, get another pair
|
|
#if cardKey != testMasterPublic:
|
|
# raise Exception("Invalid batch public key")
|
|
|
|
dataToSign = bytes(bytearray([0x01]) + testMasterPublic)
|
|
signature = testMaster.ecdsa_sign(bytes(dataToSign))
|
|
signature = testMaster.ecdsa_serialize(signature)
|
|
certificate = bytearray([len(testMasterPublic)]) + testMasterPublic + bytearray([len(signature)]) + signature
|
|
apdu = bytearray([0xE0, 0x51, 0x00, 0x00]) + bytearray([len(certificate)]) + certificate
|
|
dongle.exchange(apdu)
|
|
|
|
# provide the ephemeral certificate
|
|
ephemeralPrivate = PrivateKey()
|
|
ephemeralPublic = bytearray(ephemeralPrivate.pubkey.serialize(compressed=False))
|
|
dataToSign = bytes(bytearray([0x11]) + nonce + deviceNonce + ephemeralPublic)
|
|
signature = testMaster.ecdsa_sign(bytes(dataToSign))
|
|
signature = testMaster.ecdsa_serialize(signature)
|
|
certificate = bytearray([len(ephemeralPublic)]) + ephemeralPublic + bytearray([len(signature)]) + signature
|
|
apdu = bytearray([0xE0, 0x51, 0x80, 0x00]) + bytearray([len(certificate)]) + certificate
|
|
dongle.exchange(apdu)
|
|
|
|
# walk the device certificates to retrieve the public key to use for authentication
|
|
index = 0
|
|
last_pub_key = PublicKey(binascii.unhexlify("0490f5c9d15a0134bb019d2afd0bf297149738459706e7ac5be4abc350a1f818057224fce12ec9a65de18ec34d6e8c24db927835ea1692b14c32e9836a75dad609"), raw=True)
|
|
while True:
|
|
if index == 0:
|
|
certificate = bytearray(dongle.exchange(bytearray.fromhex('E052000000')))
|
|
elif index == 1:
|
|
certificate = bytearray(dongle.exchange(bytearray.fromhex('E052800000')))
|
|
else:
|
|
break
|
|
if len(certificate) == 0:
|
|
break
|
|
offset = 1
|
|
certificateHeader = certificate[offset : offset + certificate[offset-1]]
|
|
offset += certificate[offset-1] + 1
|
|
certificatePublicKey = certificate[offset : offset + certificate[offset-1]]
|
|
offset += certificate[offset-1] + 1
|
|
certificateSignatureArray = certificate[offset : offset + certificate[offset-1]]
|
|
certificateSignature = last_pub_key.ecdsa_deserialize(bytes(certificateSignatureArray))
|
|
# first cert contains a header field which holds the certificate's public key role
|
|
if index == 0:
|
|
certificateSignedData = bytearray([0x02]) + certificateHeader + certificatePublicKey
|
|
# Could check if the device certificate is signed by the issuer public key
|
|
# ephemeral key certificate
|
|
else:
|
|
certificateSignedData = bytearray([0x12]) + deviceNonce + nonce + certificatePublicKey
|
|
if not last_pub_key.ecdsa_verify(bytes(certificateSignedData), certificateSignature):
|
|
return None
|
|
last_pub_key = PublicKey(bytes(certificatePublicKey), raw=True)
|
|
index = index + 1
|
|
|
|
# Commit device ECDH channel
|
|
dongle.exchange(bytearray.fromhex('E053000000'))
|
|
secret = last_pub_key.ecdh(binascii.unhexlify(ephemeralPrivate.serialize()))
|
|
return secret[0:16]
|
|
|
|
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument("--targetId", help="Set the chip target ID", type=auto_int)
|
|
parser.add_argument("--apdu", help="Display APDU log", action='store_true')
|
|
|
|
args = parser.parse_args()
|
|
|
|
if args.targetId == None:
|
|
args.targetId = 0x31000002
|
|
|
|
privateKey = PrivateKey()
|
|
publicKey = str(privateKey.pubkey.serialize(compressed=False))
|
|
args.rootPrivateKey = privateKey.serialize()
|
|
|
|
genuine = False
|
|
|
|
dongle = getDongle(args.apdu)
|
|
|
|
secret = getDeployedSecretV2(dongle, bytearray.fromhex(args.rootPrivateKey), args.targetId)
|
|
if secret != None:
|
|
loader = HexLoader(dongle, 0xe0, True, secret)
|
|
data = b'\xFF'
|
|
data = loader.encryptAES(data)
|
|
try:
|
|
loader.exchange(loader.cla, 0x00, 0x00, 0x00, data)
|
|
except CommException as e:
|
|
genuine = (e.sw == 0x6D00)
|
|
|
|
if genuine:
|
|
print ("Product is genuine")
|
|
else:
|
|
print ("Product is NOT genuine")
|
|
|