# Copyright (c) 2026 Emanuele Bellocchia
#
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# furnished to do so, subject to the following conditions:
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"""Module for Aptos address encoding/decoding."""
# Imports
import binascii
from typing import Any, Union
from typing_extensions import override
from bip_utils.addr.addr_dec_utils import AddrDecUtils
from bip_utils.addr.addr_key_validator import AddrKeyValidator
from bip_utils.addr.iaddr_decoder import IAddrDecoder
from bip_utils.addr.iaddr_encoder import IAddrEncoder
from bip_utils.coin_conf import CoinsConf
from bip_utils.ecc import IPublicKey
from bip_utils.utils.crypto import Sha3_256
from bip_utils.utils.misc import BytesUtils
class AptosAddrConst:
"""Class container for Aptos address constants."""
# Suffix byte for single signature
SINGLE_SIG_SUFFIX_BYTE: bytes = b"\x00"
class AptosAddrDecoder(IAddrDecoder):
"""
Aptos address decoder class.
It allows the Aptos address decoding.
"""
@override
@staticmethod
def DecodeAddr(addr: str,
**kwargs: Any) -> bytes:
"""
Decode an Aptos address to bytes.
Args:
addr (str): Address string
**kwargs : Not used
Returns:
bytes: Public key bytes
Raises:
ValueError: If the address encoding is not valid
"""
# Validate and remove prefix
addr_no_prefix = AddrDecUtils.ValidateAndRemovePrefix(addr,
CoinsConf.Aptos.ParamByKey("addr_prefix"))
addr_no_prefix = addr_no_prefix.rjust(Sha3_256.DigestSize() * 2, "0")
# Validate length
AddrDecUtils.ValidateLength(addr_no_prefix, Sha3_256.DigestSize() * 2)
try:
return BytesUtils.FromHexString(addr_no_prefix)
except binascii.Error as ex:
raise ValueError("Invalid hex encoding") from ex
class AptosAddrEncoder(IAddrEncoder):
"""
Aptos address encoder class.
It allows the Aptos address encoding.
"""
@override
@staticmethod
def EncodeKey(pub_key: Union[bytes, IPublicKey],
**kwargs: Any) -> str:
"""
Encode a public key to Aptos address.
Args:
pub_key (bytes or IPublicKey): Public key bytes or object
Other Parameters:
trim_zeroes (bool, optional): True to trim left zeroes from the address string, false otherwise (default)
Returns:
str: Address string
Raises:
ValueError: If the public key is not valid
TypeError: If the public key is not ed25519
"""
trim_zeroes = kwargs.get("trim_zeroes", False)
pub_key_obj = AddrKeyValidator.ValidateAndGetEd25519Key(pub_key)
payload_bytes = pub_key_obj.RawCompressed().ToBytes()[1:] + AptosAddrConst.SINGLE_SIG_SUFFIX_BYTE
key_hash_str = BytesUtils.ToHexString(Sha3_256.QuickDigest(payload_bytes))
return CoinsConf.Aptos.ParamByKey("addr_prefix") + (key_hash_str.lstrip("0") if trim_zeroes else key_hash_str)
# Deprecated: only for compatibility, Encoder class shall be used instead
AptosAddr = AptosAddrEncoder