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-# 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))
- if decode(hrp, ret) == (None, None):
- return None
- return ret