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-rw-r--r--test/functional/test_framework/segwit_addr.py54
1 files changed, 37 insertions, 17 deletions
diff --git a/test/functional/test_framework/segwit_addr.py b/test/functional/test_framework/segwit_addr.py
index 00c0d8a919..861ca2b949 100644
--- a/test/functional/test_framework/segwit_addr.py
+++ b/test/functional/test_framework/segwit_addr.py
@@ -2,10 +2,18 @@
# Copyright (c) 2017 Pieter Wuille
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-"""Reference implementation for Bech32 and segwit addresses."""
+"""Reference implementation for Bech32/Bech32m and segwit addresses."""
import unittest
+from enum import Enum
CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
+BECH32_CONST = 1
+BECH32M_CONST = 0x2bc830a3
+
+class Encoding(Enum):
+ """Enumeration type to list the various supported encodings."""
+ BECH32 = 1
+ BECH32M = 2
def bech32_polymod(values):
@@ -27,38 +35,45 @@ def bech32_hrp_expand(hrp):
def bech32_verify_checksum(hrp, data):
"""Verify a checksum given HRP and converted data characters."""
- return bech32_polymod(bech32_hrp_expand(hrp) + data) == 1
-
+ check = bech32_polymod(bech32_hrp_expand(hrp) + data)
+ if check == BECH32_CONST:
+ return Encoding.BECH32
+ elif check == BECH32M_CONST:
+ return Encoding.BECH32M
+ else:
+ return None
-def bech32_create_checksum(hrp, data):
+def bech32_create_checksum(encoding, hrp, data):
"""Compute the checksum values given HRP and data."""
values = bech32_hrp_expand(hrp) + data
- polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ 1
+ const = BECH32M_CONST if encoding == Encoding.BECH32M else BECH32_CONST
+ polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ const
return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]
-def bech32_encode(hrp, data):
- """Compute a Bech32 string given HRP and data values."""
- combined = data + bech32_create_checksum(hrp, data)
+def bech32_encode(encoding, hrp, data):
+ """Compute a Bech32 or Bech32m string given HRP and data values."""
+ combined = data + bech32_create_checksum(encoding, hrp, data)
return hrp + '1' + ''.join([CHARSET[d] for d in combined])
def bech32_decode(bech):
- """Validate a Bech32 string, and determine HRP and data."""
+ """Validate a Bech32/Bech32m string, and determine HRP and data."""
if ((any(ord(x) < 33 or ord(x) > 126 for x in bech)) or
(bech.lower() != bech and bech.upper() != bech)):
- return (None, None)
+ return (None, None, None)
bech = bech.lower()
pos = bech.rfind('1')
if pos < 1 or pos + 7 > len(bech) or len(bech) > 90:
- return (None, None)
+ return (None, None, None)
if not all(x in CHARSET for x in bech[pos+1:]):
- return (None, None)
+ return (None, None, None)
hrp = bech[:pos]
data = [CHARSET.find(x) for x in bech[pos+1:]]
- if not bech32_verify_checksum(hrp, data):
- return (None, None)
- return (hrp, data[:-6])
+ encoding = bech32_verify_checksum(hrp, data)
+ if encoding is None:
+ return (None, None, None)
+ return (encoding, hrp, data[:-6])
def convertbits(data, frombits, tobits, pad=True):
@@ -86,7 +101,7 @@ def convertbits(data, frombits, tobits, pad=True):
def decode_segwit_address(hrp, addr):
"""Decode a segwit address."""
- hrpgot, data = bech32_decode(addr)
+ encoding, hrpgot, data = bech32_decode(addr)
if hrpgot != hrp:
return (None, None)
decoded = convertbits(data[1:], 5, 8, False)
@@ -96,12 +111,15 @@ def decode_segwit_address(hrp, addr):
return (None, None)
if data[0] == 0 and len(decoded) != 20 and len(decoded) != 32:
return (None, None)
+ if (data[0] == 0 and encoding != Encoding.BECH32) or (data[0] != 0 and encoding != Encoding.BECH32M):
+ return (None, None)
return (data[0], decoded)
def encode_segwit_address(hrp, witver, witprog):
"""Encode a segwit address."""
- ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5))
+ encoding = Encoding.BECH32 if witver == 0 else Encoding.BECH32M
+ ret = bech32_encode(encoding, hrp, [witver] + convertbits(witprog, 8, 5))
if decode_segwit_address(hrp, ret) == (None, None):
return None
return ret
@@ -119,3 +137,5 @@ class TestFrameworkScript(unittest.TestCase):
# P2WSH
test_python_bech32('bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj')
test_python_bech32('bcrt1qft5p2uhsdcdc3l2ua4ap5qqfg4pjaqlp250x7us7a8qqhrxrxfsqseac85')
+ # P2TR
+ test_python_bech32('bcrt1p0xlxvlhemja6c4dqv22uapctqupfhlxm9h8z3k2e72q4k9hcz7vqc8gma6')