/
hexLoader.py
532 lines (475 loc) · 18.1 KB
/
hexLoader.py
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"""
*******************************************************************************
* 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 Cryptodome.Cipher import AES
import sys
import struct
import hashlib
import binascii
from .ecWrapper import PrivateKey, PublicKey
from builtins import int
from ecpy.curves import Curve
import os
#from builtins import str
LOAD_SEGMENT_CHUNK_HEADER_LENGTH = 3
MIN_PADDING_LENGTH = 1
SCP_MAC_LENGTH = 0xE
BOLOS_TAG_APPNAME = 0x01
BOLOS_TAG_APPVERSION = 0x02
BOLOS_TAG_ICON = 0x03
BOLOS_TAG_DERIVEPATH = 0x04
BOLOS_TAG_DATASIZE = 0x05
BOLOS_TAG_DEPENDENCY = 0x06
def string_to_bytes(x):
import sys
if sys.version_info.major == 3:
return bytes(x, 'ascii')
else:
return bytes(x)
def encodelv(v):
l = len(v)
s = b""
if l < 128:
s += struct.pack(">B", l)
elif l < 256:
s += struct.pack(">B", 0x81)
s += struct.pack(">B", l)
elif l < 65536:
s += struct.pack(">B", 0x82)
s += struct.pack(">H", l)
else:
raise Exception("Unimplemented LV encoding")
s += v
return s
def encodetlv(t, v):
l = len(v)
s = struct.pack(">B", t)
if l < 128:
s += struct.pack(">B", l)
elif l < 256:
s += struct.pack(">B", 0x81)
s += struct.pack(">B", l)
elif l < 65536:
s += struct.pack(">B", 0x82)
s += struct.pack(">H", l)
else:
raise Exception("Unimplemented TLV encoding")
s += v
return s
def str2bool(v):
if v is not None:
return v.lower() in ("yes", "true", "t", "1")
return False
SCP_DEBUG = str2bool(os.getenv("SCP_DEBUG"))
class HexLoader:
def scp_derive_key(self, ecdh_secret, keyindex):
retry = 0
# di = sha256(i || retrycounter || ecdh secret)
while True:
sha256 = hashlib.new('sha256')
sha256.update(struct.pack(">IB", keyindex, retry))
sha256.update(ecdh_secret)
# compare di with order
CURVE_SECP256K1 = Curve.get_curve('secp256k1')
if int.from_bytes(sha256.digest(), 'big') < CURVE_SECP256K1.order:
break
#regenerate a new di satisfying order upper bound
retry+=1
# Pi = di*G
privkey = PrivateKey(bytes(sha256.digest()))
pubkey = bytearray(privkey.pubkey.serialize(compressed=False))
# ki = sha256(Pi)
sha256 = hashlib.new('sha256')
sha256.update(pubkey)
#print ("Key " + str (keyindex) + ": " + sha256.hexdigest())
return sha256.digest()
def __init__(self, card, cla=0xF0, secure=False, mutauth_result=None, relative=True, cleardata_block_len=None):
self.card = card
self.cla = cla
self.secure = secure
self.createappParams = None
#legacy unsecure SCP (pre nanos-1.4, pre blue-2.1)
self.max_mtu = 0xFE
if not self.card is None:
self.max_mtu = min(self.max_mtu, self.card.apduMaxDataSize())
self.scpVersion = 2
self.key = mutauth_result
self.iv = b'\x00' * 16
self.relative = relative
#store the aligned block len to be transported if requested
self.cleardata_block_len=cleardata_block_len
if not (self.cleardata_block_len is None):
if not self.card is None:
self.cleardata_block_len = min(self.cleardata_block_len, self.card.apduMaxDataSize())
# try:
if type(mutauth_result) is dict and 'ecdh_secret' in mutauth_result:
self.scp_enc_key = self.scp_derive_key(mutauth_result['ecdh_secret'], 0)[0:16]
self.scp_enc_iv = b"\x00" * 16
self.scp_mac_key = self.scp_derive_key(mutauth_result['ecdh_secret'], 1)[0:16]
self.scp_mac_iv = b"\x00" * 16
self.scpVersion = 3
self.max_mtu = 0xFE
if not self.card is None:
self.max_mtu = min(self.max_mtu, self.card.apduMaxDataSize()&0xF0)
# except:
# pass
def crc16(self, data):
TABLE_CRC16_CCITT = [
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
]
crc = 0xFFFF
for i in range(0, len(data)):
b = data[i] & 0xff
b = (b ^ ((crc >> 8) & 0xff)) & 0xff
crc = (TABLE_CRC16_CCITT[b] ^ (crc << 8)) & 0xffff
return crc
def exchange(self, cla, ins, p1, p2, data):
#wrap
data = self.scpWrap(data)
apdu = bytearray([cla, ins, p1, p2, len(data)]) + bytearray(data)
if self.card == None:
print("%s" % binascii.hexlify(apdu))
else:
# unwrap after exchanged
return self.scpUnwrap(bytes(self.card.exchange(apdu)))
def scpWrap(self, data):
if not self.secure or data is None or len(data) == 0:
return data
if self.scpVersion == 3:
if SCP_DEBUG:
print(binascii.hexlify(data))
# ENC
paddedData = data + b'\x80'
while (len(paddedData) % 16) != 0:
paddedData += b'\x00'
if SCP_DEBUG:
print(binascii.hexlify(paddedData))
cipher = AES.new(self.scp_enc_key, AES.MODE_CBC, self.scp_enc_iv)
if sys.version_info.major == 2:
paddedData = bytes(paddedData)
encryptedData = cipher.encrypt(paddedData)
self.scp_enc_iv = encryptedData[-16:]
if SCP_DEBUG:
print(binascii.hexlify(encryptedData))
# MAC
cipher = AES.new(self.scp_mac_key, AES.MODE_CBC, self.scp_mac_iv)
macData = cipher.encrypt(encryptedData)
self.scp_mac_iv = macData[-16:]
# only append part of the mac
encryptedData += self.scp_mac_iv[-SCP_MAC_LENGTH:]
if SCP_DEBUG:
print(binascii.hexlify(encryptedData))
else:
paddedData = data + b'\x80'
while (len(paddedData) % 16) != 0:
paddedData += b'\x00'
cipher = AES.new(self.key, AES.MODE_CBC, self.iv)
if SCP_DEBUG:
print("wrap_old: "+binascii.hexlify(paddedData))
encryptedData = cipher.encrypt(paddedData)
self.iv = encryptedData[-16:]
#print (">>")
return encryptedData
def scpUnwrap(self, data):
if not self.secure or data is None or len(data) == 0 or len(data) == 2:
return data
if sys.version_info.major == 3:
padding_char = 0x80
else:
padding_char = chr(0x80)
if self.scpVersion == 3:
if SCP_DEBUG:
print(binascii.hexlify(data))
# MAC
cipher = AES.new(self.scp_mac_key, AES.MODE_CBC, self.scp_mac_iv)
macData = cipher.encrypt(bytes(data[0:-SCP_MAC_LENGTH]))
self.scp_mac_iv = macData[-16:]
if self.scp_mac_iv[-SCP_MAC_LENGTH:] != data[-SCP_MAC_LENGTH:] :
raise BaseException("Invalid SCP MAC")
# consume mac
data = data[0:-SCP_MAC_LENGTH]
if SCP_DEBUG:
print(binascii.hexlify(data))
# ENC
cipher = AES.new(self.scp_enc_key, AES.MODE_CBC, self.scp_enc_iv)
self.scp_enc_iv = bytes(data[-16:])
data = cipher.decrypt(bytes(data))
l = len(data) - 1
while (data[l] != padding_char):
l-=1
if l == -1:
raise BaseException("Invalid SCP ENC padding")
data = data[0:l]
decryptedData = data
if SCP_DEBUG:
print(binascii.hexlify(data))
else:
cipher = AES.new(self.key, AES.MODE_CBC, self.iv)
decryptedData = cipher.decrypt(data)
if SCP_DEBUG:
print("unwrap_old: "+binascii.hexlify(decryptedData))
l = len(decryptedData) - 1
while (decryptedData[l] != padding_char):
l-=1
if l == -1:
raise BaseException("Invalid SCP ENC padding")
decryptedData = decryptedData[0:l]
self.iv = data[-16:]
#print ("<<")
return decryptedData
def selectSegment(self, baseAddress):
data = b'\x05' + struct.pack('>I', baseAddress)
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def loadSegmentChunk(self, offset, chunk):
data = b'\x06' + struct.pack('>H', offset) + chunk
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def flushSegment(self):
data = b'\x07'
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def crcSegment(self, offsetSegment, lengthSegment, crcExpected):
data = b'\x08' + struct.pack('>H', offsetSegment) + struct.pack('>I', lengthSegment) + struct.pack('>H', crcExpected)
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def validateTargetId(self, targetId):
data = struct.pack('>I', targetId)
self.exchange(self.cla, 0x04, 0x00, 0x00, data)
def boot(self, bootadr, signature=None):
# Force jump into Thumb mode
bootadr |= 1
data = b'\x09' + struct.pack('>I', bootadr)
if (signature != None):
data += struct.pack('>B', len(signature)) + signature
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def commit(self, signature=None):
data = b'\x09'
if (signature != None):
data += struct.pack('>B', len(signature)) + signature
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def createAppNoInstallParams(self, appflags, applength, appname, icon=None, path=None, iconOffset=None, iconSize=None, appversion=None):
data = b'\x0B' + struct.pack('>I', applength) + struct.pack('>I', appflags) + struct.pack('>B', len(appname)) + appname
if iconOffset is None:
if not (icon is None):
data += struct.pack('>B', len(icon)) + icon
else:
data += b'\x00'
if not (path is None):
data += struct.pack('>B', len(path)) + path
else:
data += b'\x00'
if not iconOffset is None:
data += struct.pack('>I', iconOffset) + struct.pack('>H', iconSize)
if not appversion is None:
data += struct.pack('>B', len(appversion)) + appversion
# in previous version, appparams are not part of the application hash yet
self.createappParams = None #data[1:]
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def createApp(self, code_length, data_length=0, install_params_length=0, flags=0, bootOffset=1):
#keep the create app parameters to be included in the load app hash
self.createappParams = struct.pack('>IIIII', code_length, data_length, install_params_length, flags, bootOffset)
data = b'\x0B' + self.createappParams
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def deleteApp(self, appname):
data = b'\x0C' + struct.pack('>B',len(appname)) + appname
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def deleteAppByHash(self, appfullhash):
if len(appfullhash) != 32:
raise BaseException("Invalid hash format, sha256 expected")
data = b'\x15' + appfullhash
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def getVersion(self):
data = b'\x10'
response = self.exchange(self.cla, 0x00, 0x00, 0x00, data)
if sys.version_info.major == 2:
response = bytearray(response)
result = {}
offset = 0
result['targetId'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
result['osVersion'] = response[offset + 1 : offset + 1 + response[offset]].decode('utf-8')
offset += 1 + response[offset]
offset += 1
result['flags'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
result['mcuVersion'] = response[offset + 1 : offset + 1 + response[offset] - 1].decode('utf-8')
offset += 1 + response[offset]
if (offset < len(response)):
result['mcuHash'] = response[offset : offset + 32]
return result
def listApp(self, restart=True):
if self.secure:
if restart:
data = b'\x0E'
else:
data = b'\x0F'
response = self.exchange(self.cla, 0x00, 0x00, 0x00, data)
else:
if restart:
response = self.exchange(self.cla, 0xDE, 0x00, 0x00, b'')
else:
response = self.exchange(self.cla, 0xDF, 0x00, 0x00, b'')
if sys.version_info.major == 2:
response = bytearray(response)
#print binascii.hexlify(response[0])
result = []
offset = 0
if len(response) > 0:
if response[0] != 0x01:
# support old format
while offset != len(response):
item = {}
offset += 1
item['name'] = response[offset + 1 : offset + 1 + response[offset]].decode('utf-8')
offset += 1 + response[offset]
item['flags'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
item['hash'] = response[offset : offset + 32]
offset += 32
result.append(item)
else:
offset += 1
while offset != len(response):
item = {}
#skip the current entry's size
offset += 1
item['flags'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
item['hash_code_data'] = response[offset : offset + 32]
offset += 32
item['hash'] = response[offset : offset + 32]
offset += 32
item['name'] = response[offset + 1 : offset + 1 + response[offset]].decode('utf-8')
offset += 1 + response[offset]
result.append(item)
return result
def getMemInfo(self):
response = self.exchange(self.cla, 0x00, 0x00, 0x00, b'\x11')
if sys.version_info.major == 2:
response = bytearray(response)
item = {}
offset = 0
item['systemSize'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
item['applicationsSize'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
item['freeSize'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
item['usedAppSlots'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
offset += 4
item['totalAppSlots'] = (response[offset] << 24) | (response[offset + 1] << 16) | (response[offset + 2] << 8) | response[offset + 3]
return item
def load(self, erase_u8, max_length_per_apdu, hexFile, reverse=False, doCRC=True, targetId=None, targetVersion=None):
if (max_length_per_apdu > self.max_mtu):
max_length_per_apdu = self.max_mtu
initialAddress = 0
if self.relative:
initialAddress = hexFile.minAddr()
sha256 = hashlib.new('sha256')
# stat by hashing the create app params to ensure complete app signature
if (targetId != None and (targetId&0xF) > 3):
if (targetVersion == None):
print("Target version is not set, application hash will not match!")
targetVersion=""
#encore targetId U4LE, and version string bytes
sha256.update(struct.pack('>I', targetId) + string_to_bytes(targetVersion))
if self.createappParams:
sha256.update(self.createappParams)
areas = hexFile.getAreas()
if reverse:
areas = reversed(hexFile.getAreas())
for area in areas:
startAddress = area.getStart() - initialAddress
data = area.getData()
self.selectSegment(startAddress)
if len(data) == 0:
continue
if len(data) > 0x10000:
raise Exception("Invalid data size for loader")
crc = self.crc16(bytearray(data))
offset = 0
length = len(data)
if reverse:
offset = length
while (length > 0):
if length > max_length_per_apdu - LOAD_SEGMENT_CHUNK_HEADER_LENGTH - MIN_PADDING_LENGTH - SCP_MAC_LENGTH:
chunkLen = max_length_per_apdu - LOAD_SEGMENT_CHUNK_HEADER_LENGTH - MIN_PADDING_LENGTH - SCP_MAC_LENGTH
if (chunkLen%16) != 0:
chunkLen -= (chunkLen%16)
else:
chunkLen = length
if self.cleardata_block_len and chunkLen%self.cleardata_block_len:
if (chunkLen < self.cleardata_block_len):
raise Exception("Cannot transport not block aligned data with fixed block len")
chunkLen -= chunkLen%self.cleardata_block_len;
# pad with 00's when not complete block and performing NENC
if reverse:
chunk = data[offset-chunkLen : offset]
self.loadSegmentChunk(offset-chunkLen, bytes(chunk))
else:
chunk = data[offset : offset + chunkLen]
sha256.update(chunk)
self.loadSegmentChunk(offset, bytes(chunk))
if reverse:
offset -= chunkLen
else:
offset += chunkLen
length -= chunkLen
self.flushSegment()
if doCRC:
self.crcSegment(0, len(data), crc)
return sha256.hexdigest()
def run(self, bootoffset=1, signature=None):
self.boot(bootoffset, signature)
def resetCustomCA(self):
data = b'\x13'
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def setupCustomCA(self, name, public):
data = b'\x12' + struct.pack('>B', len(name)) + name.encode() + struct.pack('>B', len(public)) + public
self.exchange(self.cla, 0x00, 0x00, 0x00, data)
def runApp(self, name):
data = name
self.exchange(self.cla, 0xD8, 0x00, 0x00, data)