mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-30 11:28:21 +00:00
327 lines
9.7 KiB
Python
327 lines
9.7 KiB
Python
import base64
|
|
import struct
|
|
import xdrlib
|
|
|
|
from . import messages as proto
|
|
|
|
# Memo types
|
|
MEMO_TYPE_TEXT = 0
|
|
MEMO_TYPE_ID = 1
|
|
MEMO_TYPE_HASH = 2
|
|
MEMO_TYPE_RETURN = 4
|
|
|
|
# Asset types
|
|
ASSET_TYPE_NATIVE = 0
|
|
ASSET_TYPE_ALPHA4 = 1
|
|
ASSET_TYPE_ALPHA12 = 2
|
|
|
|
# Operations
|
|
OP_CREATE_ACCOUNT = 0
|
|
OP_PAYMENT = 1
|
|
OP_PATH_PAYMENT = 2
|
|
OP_MANAGE_OFFER = 3
|
|
OP_CREATE_PASSIVE_OFFER = 4
|
|
OP_SET_OPTIONS = 5
|
|
OP_CHANGE_TRUST = 6
|
|
OP_ALLOW_TRUST = 7
|
|
OP_ACCOUNT_MERGE = 8
|
|
OP_INFLATION = 9 # Included for documentation purposes, not supported by Trezor
|
|
OP_MANAGE_DATA = 10
|
|
OP_BUMP_SEQUENCE = 11
|
|
|
|
|
|
def expand_path_or_default(client, address):
|
|
"""Uses client to parse address and returns an array of integers
|
|
If no address is specified, the default of m/44'/148'/0' is used
|
|
"""
|
|
if address:
|
|
return client.expand_path(address)
|
|
else:
|
|
return client.expand_path("m/44'/148'/0'")
|
|
|
|
|
|
def address_from_public_key(pk_bytes):
|
|
"""Returns the base32-encoded version of pk_bytes (G...)
|
|
"""
|
|
final_bytes = bytearray()
|
|
|
|
# version
|
|
final_bytes.append(6 << 3)
|
|
# public key
|
|
final_bytes.extend(pk_bytes)
|
|
# checksum
|
|
final_bytes.extend(struct.pack("<H", _crc16_checksum(final_bytes)))
|
|
|
|
return base64.b32encode(final_bytes)
|
|
|
|
|
|
def address_to_public_key(address_str):
|
|
"""Returns the raw 32 bytes representing a public key by extracting
|
|
it from the G... string
|
|
"""
|
|
decoded = base64.b32decode(address_str)
|
|
|
|
# skip 0th byte (version) and last two bytes (checksum)
|
|
return decoded[1:-2]
|
|
|
|
|
|
def parse_transaction_bytes(tx_bytes):
|
|
"""Parses base64data into a map with the following keys:
|
|
tx - a StellarSignTx describing the transaction header
|
|
operations - an array of protobuf message objects for each operation
|
|
"""
|
|
tx = proto.StellarSignTx(
|
|
protocol_version=1
|
|
)
|
|
unpacker = xdrlib.Unpacker(tx_bytes)
|
|
|
|
tx.source_account = _xdr_read_address(unpacker)
|
|
tx.fee = unpacker.unpack_uint()
|
|
tx.sequence_number = unpacker.unpack_uhyper()
|
|
|
|
# Timebounds is an optional field
|
|
if unpacker.unpack_bool():
|
|
max_timebound = 2**32 - 1 # max unsigned 32-bit int (trezor does not support the full 64-bit time value)
|
|
tx.timebounds_start = unpacker.unpack_uhyper()
|
|
tx.timebounds_end = unpacker.unpack_uhyper()
|
|
|
|
if tx.timebounds_start > max_timebound or tx.timebounds_start < 0:
|
|
raise ValueError("Starting timebound out of range (must be between 0 and " + max_timebound)
|
|
if tx.timebounds_end > max_timebound or tx.timebounds_end < 0:
|
|
raise ValueError("Ending timebound out of range (must be between 0 and " + max_timebound)
|
|
|
|
# memo type determines what optional fields are set
|
|
tx.memo_type = unpacker.unpack_uint()
|
|
|
|
# text
|
|
if tx.memo_type == MEMO_TYPE_HASH:
|
|
tx.memo_text = unpacker.unpack_string()
|
|
# id (64-bit uint)
|
|
if tx.memo_type == MEMO_TYPE_ID:
|
|
tx.memo_id = unpacker.unpack_uhyper()
|
|
# hash / return are the same structure (32 bytes representing a hash)
|
|
if tx.memo_type == MEMO_TYPE_HASH or tx.memo_type == MEMO_TYPE_RETURN:
|
|
tx.memo_hash = unpacker.unpack_fopaque(32)
|
|
|
|
tx.num_operations = unpacker.unpack_uint()
|
|
|
|
operations = []
|
|
for i in range(tx.num_operations):
|
|
operations.append(_parse_operation_bytes(unpacker))
|
|
|
|
return tx, operations
|
|
|
|
|
|
def _parse_operation_bytes(unpacker):
|
|
"""Returns a protobuf message representing the next operation as read from
|
|
the byte stream in unpacker
|
|
"""
|
|
|
|
# Check for and parse optional source account field
|
|
source_account = None
|
|
if unpacker.unpack_bool():
|
|
source_account = unpacker.unpack_fopaque(32)
|
|
|
|
# Operation type (See OP_ constants)
|
|
type = unpacker.unpack_uint()
|
|
|
|
if type == OP_CREATE_ACCOUNT:
|
|
return proto.StellarCreateAccountOp(
|
|
source_account=source_account,
|
|
new_account=_xdr_read_address(unpacker),
|
|
starting_balance=unpacker.unpack_hyper()
|
|
)
|
|
|
|
if type == OP_PAYMENT:
|
|
return proto.StellarPaymentOp(
|
|
source_account=source_account,
|
|
destination_account=_xdr_read_address(unpacker),
|
|
asset=_xdr_read_asset(unpacker),
|
|
amount=unpacker.unpack_hyper()
|
|
)
|
|
|
|
if type == OP_PATH_PAYMENT:
|
|
op = proto.StellarPathPaymentOp(
|
|
source_account=source_account,
|
|
send_asset=_xdr_read_asset(unpacker),
|
|
send_max=unpacker.unpack_hyper(),
|
|
destination_account=_xdr_read_address(unpacker),
|
|
destination_asset=_xdr_read_asset(unpacker),
|
|
paths=[]
|
|
)
|
|
|
|
num_paths = unpacker.unpack_uint()
|
|
for i in range(num_paths):
|
|
op.paths.append(_xdr_read_asset(unpacker))
|
|
|
|
return op
|
|
|
|
if type == OP_MANAGE_OFFER:
|
|
return proto.StellarManageOfferOp(
|
|
source_account=source_account,
|
|
selling_asset=_xdr_read_asset(unpacker),
|
|
buying_asset=_xdr_read_asset(unpacker),
|
|
amount=unpacker.unpack_hyper(),
|
|
price_n=unpacker.unpack_uint(),
|
|
price_d=unpacker.unpack_uint(),
|
|
offer_id=unpacker.unpack_uhyper()
|
|
)
|
|
|
|
if type == OP_CREATE_PASSIVE_OFFER:
|
|
return proto.StellarCreatePassiveOfferOp(
|
|
source_account=source_account,
|
|
selling_asset=_xdr_read_asset(unpacker),
|
|
buying_asset=_xdr_read_asset(unpacker),
|
|
amount=unpacker.unpack_hyper(),
|
|
price_n=unpacker.unpack_uint(),
|
|
price_d=unpacker.unpack_uint()
|
|
)
|
|
|
|
if type == OP_SET_OPTIONS:
|
|
op = proto.StellarSetOptionsOp(
|
|
source_account=source_account
|
|
)
|
|
|
|
# Inflation destination
|
|
if unpacker.unpack_bool():
|
|
op.inflation_destination_account = _xdr_read_address(unpacker)
|
|
|
|
# clear flags
|
|
if unpacker.unpack_bool():
|
|
op.clear_flags = unpacker.unpack_uint()
|
|
|
|
# set flags
|
|
if unpacker.unpack_bool():
|
|
op.set_flags = unpacker.unpack_uint()
|
|
|
|
# master weight
|
|
if unpacker.unpack_bool():
|
|
op.master_weight = unpacker.unpack_uint()
|
|
|
|
# low threshold
|
|
if unpacker.unpack_bool():
|
|
op.low_threshold = unpacker.unpack_uint()
|
|
|
|
# medium threshold
|
|
if unpacker.unpack_bool():
|
|
op.medium_threshold = unpacker.unpack_uint()
|
|
|
|
# high threshold
|
|
if unpacker.unpack_bool():
|
|
op.high_threshold = unpacker.unpack_uint()
|
|
|
|
# home domain
|
|
if unpacker.unpack_bool():
|
|
op.home_domain = unpacker.unpack_string()
|
|
|
|
# signer
|
|
if unpacker.unpack_bool():
|
|
op.signer_type = unpacker.unpack_uint()
|
|
op.signer_key = unpacker.unpack_fopaque(32)
|
|
op.signer_weight = unpacker.unpack_uint()
|
|
|
|
return op
|
|
|
|
if type == OP_CHANGE_TRUST:
|
|
return proto.StellarChangeTrustOp(
|
|
source_account=source_account,
|
|
asset=_xdr_read_asset(unpacker),
|
|
limit=unpacker.unpack_uhyper()
|
|
)
|
|
|
|
if type == OP_ALLOW_TRUST:
|
|
op = proto.StellarAllowTrustOp(
|
|
source_account=source_account,
|
|
trusted_account=_xdr_read_address(unpacker),
|
|
asset_type=unpacker.unpack_uint()
|
|
)
|
|
|
|
if op.asset_type == ASSET_TYPE_ALPHA4:
|
|
op.asset_code = unpacker.unpack_fstring(4)
|
|
if op.asset_type == ASSET_TYPE_ALPHA12:
|
|
op.asset_code = unpacker.unpack_fstring(12)
|
|
|
|
op.is_authorized = unpacker.unpack_bool()
|
|
|
|
return op
|
|
|
|
if type == OP_ACCOUNT_MERGE:
|
|
return proto.StellarAccountMergeOp(
|
|
source_account=source_account,
|
|
destination_account=_xdr_read_address(unpacker)
|
|
)
|
|
|
|
# Inflation is not implemented since anyone can submit this operation to the network
|
|
|
|
if type == OP_MANAGE_DATA:
|
|
op = proto.StellarManageDataOp(
|
|
source_account=source_account,
|
|
key=unpacker.unpack_string(),
|
|
)
|
|
|
|
# Only set value if the field is present
|
|
if unpacker.unpack_bool():
|
|
op.value = unpacker.unpack_opaque()
|
|
|
|
return op
|
|
|
|
# Bump Sequence
|
|
# see: https://github.com/stellar/stellar-core/blob/master/src/xdr/Stellar-transaction.x#L269
|
|
if type == OP_BUMP_SEQUENCE:
|
|
return proto.StellarBumpSequenceOp(
|
|
source_account=source_account,
|
|
bump_to=unpacker.unpack_uhyper()
|
|
)
|
|
|
|
raise ValueError("Unknown operation type: " + type)
|
|
|
|
|
|
def _xdr_read_asset(unpacker):
|
|
"""Reads a stellar Asset from unpacker"""
|
|
asset = proto.StellarAssetType(
|
|
type=unpacker.unpack_uint()
|
|
)
|
|
|
|
if asset.type == ASSET_TYPE_ALPHA4:
|
|
asset.code = unpacker.unpack_fstring(4)
|
|
asset.issuer = _xdr_read_address(unpacker)
|
|
|
|
if asset.type == ASSET_TYPE_ALPHA12:
|
|
asset.code = unpacker.unpack_fstring(12)
|
|
asset.issuer = _xdr_read_address(unpacker)
|
|
|
|
return asset
|
|
|
|
|
|
def _xdr_read_address(unpacker):
|
|
"""Reads a stellar address and returns the 32-byte
|
|
data representing the address
|
|
"""
|
|
# First 4 bytes are the address type
|
|
address_type = unpacker.unpack_uint()
|
|
if address_type != 0:
|
|
raise ValueError("Unsupported address type")
|
|
|
|
return unpacker.unpack_fopaque(32)
|
|
|
|
|
|
def _crc16_checksum(bytes):
|
|
"""Returns the CRC-16 checksum of bytearray bytes
|
|
|
|
Ported from Java implementation at: http://introcs.cs.princeton.edu/java/61data/CRC16CCITT.java.html
|
|
|
|
Initial value changed to 0x0000 to match Stellar configuration.
|
|
"""
|
|
crc = 0x0000
|
|
polynomial = 0x1021
|
|
|
|
for byte in bytes:
|
|
for i in range(8):
|
|
bit = ((byte >> (7 - i) & 1) == 1)
|
|
c15 = ((crc >> 15 & 1) == 1)
|
|
crc <<= 1
|
|
if c15 ^ bit:
|
|
crc ^= polynomial
|
|
|
|
return crc & 0xffff
|