tavoid duplicating bech32 module - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
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---
DIR commit 5b1a5e8786664eba0476453de166243073b62fd9
DIR parent f278833c40b96948ecde5f34c9e2a921ff412cb6
HTML Author: Janus <ysangkok@gmail.com>
Date: Tue, 17 Apr 2018 15:31:00 +0200
avoid duplicating bech32 module
Diffstat:
M electrum/segwit_addr.py | 4 ++--
D lib/lightning_payencode/bech32.py | 123 -------------------------------
M lib/lightning_payencode/lnaddr.py | 6 +++---
3 files changed, 5 insertions(+), 128 deletions(-)
---
DIR diff --git a/electrum/segwit_addr.py b/electrum/segwit_addr.py
t@@ -59,14 +59,14 @@ def bech32_encode(hrp, data):
return hrp + '1' + ''.join([CHARSET[d] for d in combined])
-def bech32_decode(bech):
+def bech32_decode(bech, ignore_long_length=False):
"""Validate a Bech32 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)
bech = bech.lower()
pos = bech.rfind('1')
- if pos < 1 or pos + 7 > len(bech) or len(bech) > 90:
+ if pos < 1 or pos + 7 > len(bech) or (not ignore_long_length and len(bech) > 90):
return (None, None)
if not all(x in CHARSET for x in bech[pos+1:]):
return (None, None)
DIR diff --git a/lib/lightning_payencode/bech32.py b/lib/lightning_payencode/bech32.py
t@@ -1,123 +0,0 @@
-# Copyright (c) 2017 Pieter Wuille
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-
-"""Reference implementation for Bech32 and segwit addresses."""
-
-
-CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
-
-
-def bech32_polymod(values):
- """Internal function that computes the Bech32 checksum."""
- generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
- chk = 1
- for value in values:
- top = chk >> 25
- chk = (chk & 0x1ffffff) << 5 ^ value
- for i in range(5):
- chk ^= generator[i] if ((top >> i) & 1) else 0
- return chk
-
-
-def bech32_hrp_expand(hrp):
- """Expand the HRP into values for checksum computation."""
- return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in 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
-
-
-def bech32_create_checksum(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
- 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)
- return hrp + '1' + ''.join([CHARSET[d] for d in combined])
-
-
-def bech32_decode(bech):
- """Validate a Bech32 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)
- bech = bech.lower()
- pos = bech.rfind('1')
- if pos < 1 or pos + 7 > len(bech): #or len(bech) > 90:
- return (None, None)
- if not all(x in CHARSET for x in bech[pos+1:]):
- return (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])
-
-
-def convertbits(data, frombits, tobits, pad=True):
- """General power-of-2 base conversion."""
- acc = 0
- bits = 0
- ret = []
- maxv = (1 << tobits) - 1
- max_acc = (1 << (frombits + tobits - 1)) - 1
- for value in data:
- if value < 0 or (value >> frombits):
- return None
- acc = ((acc << frombits) | value) & max_acc
- bits += frombits
- while bits >= tobits:
- bits -= tobits
- ret.append((acc >> bits) & maxv)
- if pad:
- if bits:
- ret.append((acc << (tobits - bits)) & maxv)
- elif bits >= frombits or ((acc << (tobits - bits)) & maxv):
- return None
- return ret
-
-
-def decode(hrp, addr):
- """Decode a segwit address."""
- hrpgot, data = bech32_decode(addr)
- if hrpgot != hrp:
- return (None, None)
- decoded = convertbits(data[1:], 5, 8, False)
- if decoded is None or len(decoded) < 2 or len(decoded) > 40:
- return (None, None)
- if data[0] > 16:
- return (None, None)
- if data[0] == 0 and len(decoded) != 20 and len(decoded) != 32:
- return (None, None)
- return (data[0], decoded)
-
-
-def encode(hrp, witver, witprog):
- """Encode a segwit address."""
- ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5))
- assert decode(hrp, ret) is not (None, None)
- return ret
-
DIR diff --git a/lib/lightning_payencode/lnaddr.py b/lib/lightning_payencode/lnaddr.py
t@@ -2,7 +2,7 @@
import traceback
import ecdsa.curves
from ..bitcoin import MyVerifyingKey, GetPubKey
-from .bech32 import bech32_encode, bech32_decode, CHARSET
+from ..segwit_addr import bech32_encode, bech32_decode, CHARSET
from binascii import hexlify, unhexlify
from bitstring import BitArray
from decimal import Decimal
t@@ -79,7 +79,7 @@ def encode_fallback(fallback, currency):
""" Encode all supported fallback addresses.
"""
if currency == 'bc' or currency == 'tb':
- fbhrp, witness = bech32_decode(fallback)
+ fbhrp, witness = bech32_decode(fallback, ignore_long_length=True)
if fbhrp:
if fbhrp != currency:
raise ValueError("Not a bech32 address for this currency")
t@@ -251,7 +251,7 @@ class LnAddr(object):
)
def lndecode(a, verbose=False):
- hrp, data = bech32_decode(a)
+ hrp, data = bech32_decode(a, ignore_long_length=True)
if not hrp:
raise ValueError("Bad bech32 checksum")