def b32decode(bech: String) -> Tuple[str, List[int]]:
"Validate a bech32 string, and determine HRP and data."
if isinstance(bech, str):
bech = bech.strip()
if isinstance(bech, bytes):
bech = bech.decode("ascii")
if not all(47 < ord(x) < 123 for x in bech):
raise BTClibValueError(f"ASCII character outside [48-122]: {bech}")
if bech.lower() != bech and bech.upper() != bech:
raise BTClibValueError(f"mixed case: {bech}")
bech = bech.lower()
# it is fine to limit bech32 _bitcoin_addresses_ at 90 chars,
# but it should be enforced when working with addresses,
# not here at bech32 level.
# e.g. Lightning Network uses bech32 without such limitation
# if len(bech) > 90:
# raise BTClibValueError(f"Bech32 string length ({len(bech)}) > 90")
pos = bech.rfind("1") # find the separator between hrp and data
if pos == -1:
raise BTClibValueError(f"missing HRP: {bech}")
if pos == 0:
raise BTClibValueError(f"empty HRP: {bech}")
if pos + 7 > len(bech):
raise BTClibValueError(f"too short checksum: {bech}")
hrp = bech[:pos]
if any(x not in _ALPHABET for x in bech[pos + 1:]):
raise BTClibValueError(f"invalid data characters: {bech}")
data = [_ALPHABET.find(x) for x in bech[pos + 1:]]
if _verify_checksum(hrp, data):
return hrp, data[:-6]
raise BTClibValueError(f"invalid checksum: {bech}")
def has_segwit_prefix(addr: String) -> bool:
str_addr = addr.strip().lower() if isinstance(
addr, str) else addr.decode("ascii")
return any(
str_addr.startswith(NETWORKS[net].hrp + "1") for net in NETWORKS)