mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-23 16:08:17 +00:00
320 lines
9.4 KiB
Python
320 lines
9.4 KiB
Python
import base64
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import struct
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import xdrlib
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from . import messages as proto
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# Memo types
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MEMO_TYPE_TEXT = 0
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MEMO_TYPE_ID = 1
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MEMO_TYPE_HASH = 2
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MEMO_TYPE_RETURN = 4
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# Asset types
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ASSET_TYPE_NATIVE = 0
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ASSET_TYPE_ALPHA4 = 1
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ASSET_TYPE_ALPHA12 = 2
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# Operations
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OP_CREATE_ACCOUNT = 0
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OP_PAYMENT = 1
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OP_PATH_PAYMENT = 2
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OP_MANAGE_OFFER = 3
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OP_CREATE_PASSIVE_OFFER = 4
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OP_SET_OPTIONS = 5
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OP_CHANGE_TRUST = 6
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OP_ALLOW_TRUST = 7
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OP_ACCOUNT_MERGE = 8
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OP_INFLATION = 9 # Included for documentation purposes, not supported by Trezor
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OP_MANAGE_DATA = 10
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OP_BUMP_SEQUENCE = 11
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DEFAULT_BIP32_PATH = "m/44h/148h/0h"
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def address_from_public_key(pk_bytes):
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"""Returns the base32-encoded version of pk_bytes (G...)
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"""
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final_bytes = bytearray()
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# version
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final_bytes.append(6 << 3)
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# public key
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final_bytes.extend(pk_bytes)
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# checksum
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final_bytes.extend(struct.pack("<H", _crc16_checksum(final_bytes)))
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return base64.b32encode(final_bytes)
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def address_to_public_key(address_str):
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"""Returns the raw 32 bytes representing a public key by extracting
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it from the G... string
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"""
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decoded = base64.b32decode(address_str)
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# skip 0th byte (version) and last two bytes (checksum)
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return decoded[1:-2]
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def parse_transaction_bytes(tx_bytes):
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"""Parses base64data into a map with the following keys:
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tx - a StellarSignTx describing the transaction header
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operations - an array of protobuf message objects for each operation
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"""
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tx = proto.StellarSignTx(
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protocol_version=1
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)
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unpacker = xdrlib.Unpacker(tx_bytes)
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tx.source_account = _xdr_read_address(unpacker)
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tx.fee = unpacker.unpack_uint()
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tx.sequence_number = unpacker.unpack_uhyper()
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# Timebounds is an optional field
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if unpacker.unpack_bool():
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max_timebound = 2**32 - 1 # max unsigned 32-bit int (trezor does not support the full 64-bit time value)
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tx.timebounds_start = unpacker.unpack_uhyper()
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tx.timebounds_end = unpacker.unpack_uhyper()
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if tx.timebounds_start > max_timebound or tx.timebounds_start < 0:
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raise ValueError("Starting timebound out of range (must be between 0 and " + max_timebound)
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if tx.timebounds_end > max_timebound or tx.timebounds_end < 0:
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raise ValueError("Ending timebound out of range (must be between 0 and " + max_timebound)
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# memo type determines what optional fields are set
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tx.memo_type = unpacker.unpack_uint()
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# text
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if tx.memo_type == MEMO_TYPE_HASH:
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tx.memo_text = unpacker.unpack_string()
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# id (64-bit uint)
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if tx.memo_type == MEMO_TYPE_ID:
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tx.memo_id = unpacker.unpack_uhyper()
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# hash / return are the same structure (32 bytes representing a hash)
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if tx.memo_type == MEMO_TYPE_HASH or tx.memo_type == MEMO_TYPE_RETURN:
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tx.memo_hash = unpacker.unpack_fopaque(32)
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tx.num_operations = unpacker.unpack_uint()
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operations = []
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for i in range(tx.num_operations):
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operations.append(_parse_operation_bytes(unpacker))
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return tx, operations
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def _parse_operation_bytes(unpacker):
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"""Returns a protobuf message representing the next operation as read from
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the byte stream in unpacker
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"""
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# Check for and parse optional source account field
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source_account = None
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if unpacker.unpack_bool():
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source_account = unpacker.unpack_fopaque(32)
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# Operation type (See OP_ constants)
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type = unpacker.unpack_uint()
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if type == OP_CREATE_ACCOUNT:
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return proto.StellarCreateAccountOp(
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source_account=source_account,
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new_account=_xdr_read_address(unpacker),
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starting_balance=unpacker.unpack_hyper()
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)
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if type == OP_PAYMENT:
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return proto.StellarPaymentOp(
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source_account=source_account,
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destination_account=_xdr_read_address(unpacker),
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asset=_xdr_read_asset(unpacker),
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amount=unpacker.unpack_hyper()
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)
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if type == OP_PATH_PAYMENT:
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op = proto.StellarPathPaymentOp(
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source_account=source_account,
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send_asset=_xdr_read_asset(unpacker),
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send_max=unpacker.unpack_hyper(),
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destination_account=_xdr_read_address(unpacker),
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destination_asset=_xdr_read_asset(unpacker),
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paths=[]
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)
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num_paths = unpacker.unpack_uint()
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for i in range(num_paths):
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op.paths.append(_xdr_read_asset(unpacker))
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return op
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if type == OP_MANAGE_OFFER:
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return proto.StellarManageOfferOp(
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source_account=source_account,
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selling_asset=_xdr_read_asset(unpacker),
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buying_asset=_xdr_read_asset(unpacker),
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amount=unpacker.unpack_hyper(),
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price_n=unpacker.unpack_uint(),
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price_d=unpacker.unpack_uint(),
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offer_id=unpacker.unpack_uhyper()
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)
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if type == OP_CREATE_PASSIVE_OFFER:
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return proto.StellarCreatePassiveOfferOp(
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source_account=source_account,
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selling_asset=_xdr_read_asset(unpacker),
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buying_asset=_xdr_read_asset(unpacker),
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amount=unpacker.unpack_hyper(),
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price_n=unpacker.unpack_uint(),
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price_d=unpacker.unpack_uint()
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)
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if type == OP_SET_OPTIONS:
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op = proto.StellarSetOptionsOp(
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source_account=source_account
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)
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# Inflation destination
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if unpacker.unpack_bool():
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op.inflation_destination_account = _xdr_read_address(unpacker)
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# clear flags
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if unpacker.unpack_bool():
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op.clear_flags = unpacker.unpack_uint()
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# set flags
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if unpacker.unpack_bool():
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op.set_flags = unpacker.unpack_uint()
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# master weight
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if unpacker.unpack_bool():
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op.master_weight = unpacker.unpack_uint()
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# low threshold
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if unpacker.unpack_bool():
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op.low_threshold = unpacker.unpack_uint()
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# medium threshold
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if unpacker.unpack_bool():
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op.medium_threshold = unpacker.unpack_uint()
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# high threshold
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if unpacker.unpack_bool():
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op.high_threshold = unpacker.unpack_uint()
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# home domain
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if unpacker.unpack_bool():
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op.home_domain = unpacker.unpack_string()
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# signer
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if unpacker.unpack_bool():
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op.signer_type = unpacker.unpack_uint()
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op.signer_key = unpacker.unpack_fopaque(32)
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op.signer_weight = unpacker.unpack_uint()
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return op
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if type == OP_CHANGE_TRUST:
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return proto.StellarChangeTrustOp(
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source_account=source_account,
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asset=_xdr_read_asset(unpacker),
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limit=unpacker.unpack_uhyper()
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)
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if type == OP_ALLOW_TRUST:
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op = proto.StellarAllowTrustOp(
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source_account=source_account,
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trusted_account=_xdr_read_address(unpacker),
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asset_type=unpacker.unpack_uint()
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)
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if op.asset_type == ASSET_TYPE_ALPHA4:
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op.asset_code = unpacker.unpack_fstring(4)
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if op.asset_type == ASSET_TYPE_ALPHA12:
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op.asset_code = unpacker.unpack_fstring(12)
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op.is_authorized = unpacker.unpack_bool()
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return op
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if type == OP_ACCOUNT_MERGE:
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return proto.StellarAccountMergeOp(
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source_account=source_account,
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destination_account=_xdr_read_address(unpacker)
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)
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# Inflation is not implemented since anyone can submit this operation to the network
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if type == OP_MANAGE_DATA:
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op = proto.StellarManageDataOp(
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source_account=source_account,
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key=unpacker.unpack_string(),
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)
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# Only set value if the field is present
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if unpacker.unpack_bool():
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op.value = unpacker.unpack_opaque()
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return op
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# Bump Sequence
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# see: https://github.com/stellar/stellar-core/blob/master/src/xdr/Stellar-transaction.x#L269
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if type == OP_BUMP_SEQUENCE:
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return proto.StellarBumpSequenceOp(
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source_account=source_account,
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bump_to=unpacker.unpack_uhyper()
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)
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raise ValueError("Unknown operation type: " + type)
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def _xdr_read_asset(unpacker):
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"""Reads a stellar Asset from unpacker"""
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asset = proto.StellarAssetType(
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type=unpacker.unpack_uint()
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)
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if asset.type == ASSET_TYPE_ALPHA4:
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asset.code = unpacker.unpack_fstring(4)
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asset.issuer = _xdr_read_address(unpacker)
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if asset.type == ASSET_TYPE_ALPHA12:
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asset.code = unpacker.unpack_fstring(12)
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asset.issuer = _xdr_read_address(unpacker)
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return asset
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def _xdr_read_address(unpacker):
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"""Reads a stellar address and returns the 32-byte
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data representing the address
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"""
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# First 4 bytes are the address type
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address_type = unpacker.unpack_uint()
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if address_type != 0:
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raise ValueError("Unsupported address type")
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return unpacker.unpack_fopaque(32)
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def _crc16_checksum(bytes):
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"""Returns the CRC-16 checksum of bytearray bytes
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Ported from Java implementation at: http://introcs.cs.princeton.edu/java/61data/CRC16CCITT.java.html
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Initial value changed to 0x0000 to match Stellar configuration.
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"""
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crc = 0x0000
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polynomial = 0x1021
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for byte in bytes:
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for i in range(8):
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bit = ((byte >> (7 - i) & 1) == 1)
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c15 = ((crc >> 15 & 1) == 1)
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crc <<= 1
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if c15 ^ bit:
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crc ^= polynomial
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return crc & 0xffff
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