mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-26 01:18:28 +00:00
93 lines
2.1 KiB
Python
93 lines
2.1 KiB
Python
from construct import (
|
|
AdaptationError,
|
|
Adapter,
|
|
Byte,
|
|
Bytes,
|
|
Construct,
|
|
GreedyString,
|
|
If,
|
|
Int64ul,
|
|
Optional,
|
|
PaddedString,
|
|
Prefixed,
|
|
PrefixedArray,
|
|
Struct,
|
|
Validator,
|
|
VarInt,
|
|
this,
|
|
)
|
|
|
|
from trezorlib.tools import b58decode, b58encode
|
|
|
|
|
|
def _find_in_context(context, key: str):
|
|
if key in context:
|
|
return context[key]
|
|
elif context._ is not None:
|
|
return _find_in_context(context._, key)
|
|
else:
|
|
return None
|
|
|
|
|
|
class VersionEncodingAdapter(Adapter):
|
|
def _decode(self, obj: int, context, path) -> str | int:
|
|
if obj & 0x80:
|
|
return obj - 0x80
|
|
|
|
raise AdaptationError
|
|
|
|
def _encode(self, obj: int, context, path) -> int:
|
|
return obj | 0x80
|
|
|
|
|
|
Version = Optional(VersionEncodingAdapter(Byte))
|
|
|
|
|
|
class CompactU16Validator(Validator):
|
|
def _validate(self, obj: int, context, path) -> bool:
|
|
return obj < 0x1_0000
|
|
|
|
|
|
CompactU16 = CompactU16Validator(VarInt)
|
|
|
|
|
|
def CompactArray(subcon: Construct):
|
|
return PrefixedArray(CompactU16, subcon)
|
|
|
|
|
|
def CompactStruct(*subcons, **subconskw):
|
|
return Prefixed(CompactU16, Struct(*subcons, **subconskw))
|
|
|
|
|
|
class B58Adapter(Adapter):
|
|
def _decode(self, obj: str, context, path) -> str:
|
|
# decode/encode is flipped because we are deserializing ("decoding") by representing ("encoding") the bytes in Base58
|
|
return b58encode(obj)
|
|
|
|
def _encode(self, obj: str, context, path) -> bytes:
|
|
# decode/encode is flipped because we are serializing ("encoding") by parsing ("decoding") the Base58 string
|
|
return b58decode(obj)
|
|
|
|
|
|
PublicKey = B58Adapter(Bytes(32))
|
|
|
|
|
|
class HexStringAdapter(Adapter):
|
|
def _decode(self, obj: bytes, context, path) -> str:
|
|
return obj.hex()
|
|
|
|
def _encode(self, obj: str, context, path) -> bytes:
|
|
return bytes.fromhex(obj)
|
|
|
|
|
|
Memo = GreedyString("utf8")
|
|
|
|
String = Struct("length" / Int64ul, "chars" / PaddedString(this.length, "utf-8"))
|
|
|
|
|
|
def OptionalParameter(subcon: Construct):
|
|
return Struct(
|
|
"is_included" / Byte,
|
|
"value" / Optional(If(this.is_included == 1, subcon)),
|
|
)
|