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trezor/crypto: bech32
taken from https://github.com/sipa/bech32/tree/master/ref/python
This commit is contained in:
Tomas Susanka
parent
dc6701af90
commit
2ebf1cd9f4
123
src/trezor/crypto/bech32.py
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123
src/trezor/crypto/bech32.py
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# Copyright (c) 2017 Pieter Wuille
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""Reference implementation for Bech32 and segwit addresses."""
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CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
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def bech32_polymod(values):
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"""Internal function that computes the Bech32 checksum."""
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generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
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chk = 1
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for value in values:
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top = chk >> 25
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chk = (chk & 0x1ffffff) << 5 ^ value
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for i in range(5):
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chk ^= generator[i] if ((top >> i) & 1) else 0
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return chk
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def bech32_hrp_expand(hrp):
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"""Expand the HRP into values for checksum computation."""
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return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in hrp]
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def bech32_verify_checksum(hrp, data):
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"""Verify a checksum given HRP and converted data characters."""
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return bech32_polymod(bech32_hrp_expand(hrp) + data) == 1
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def bech32_create_checksum(hrp, data):
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"""Compute the checksum values given HRP and data."""
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values = bech32_hrp_expand(hrp) + data
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polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ 1
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return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]
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def bech32_encode(hrp, data):
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"""Compute a Bech32 string given HRP and data values."""
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combined = data + bech32_create_checksum(hrp, data)
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return hrp + '1' + ''.join([CHARSET[d] for d in combined])
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def bech32_decode(bech):
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"""Validate a Bech32 string, and determine HRP and data."""
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if ((any(ord(x) < 33 or ord(x) > 126 for x in bech)) or
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(bech.lower() != bech and bech.upper() != bech)):
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return (None, None)
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bech = bech.lower()
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pos = bech.rfind('1')
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if pos < 1 or pos + 7 > len(bech) or len(bech) > 90:
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return (None, None)
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if not all(x in CHARSET for x in bech[pos+1:]):
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return (None, None)
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hrp = bech[:pos]
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data = [CHARSET.find(x) for x in bech[pos+1:]]
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if not bech32_verify_checksum(hrp, data):
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return (None, None)
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return (hrp, data[:-6])
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def convertbits(data, frombits, tobits, pad=True):
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"""General power-of-2 base conversion."""
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acc = 0
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bits = 0
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ret = []
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maxv = (1 << tobits) - 1
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max_acc = (1 << (frombits + tobits - 1)) - 1
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for value in data:
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if value < 0 or (value >> frombits):
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return None
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acc = ((acc << frombits) | value) & max_acc
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bits += frombits
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while bits >= tobits:
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bits -= tobits
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ret.append((acc >> bits) & maxv)
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if pad:
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if bits:
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ret.append((acc << (tobits - bits)) & maxv)
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elif bits >= frombits or ((acc << (tobits - bits)) & maxv):
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return None
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return ret
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def decode(hrp, addr):
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"""Decode a segwit address."""
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hrpgot, data = bech32_decode(addr)
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if hrpgot != hrp:
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return (None, None)
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decoded = convertbits(data[1:], 5, 8, False)
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if decoded is None or len(decoded) < 2 or len(decoded) > 40:
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return (None, None)
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if data[0] > 16:
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return (None, None)
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if data[0] == 0 and len(decoded) != 20 and len(decoded) != 32:
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return (None, None)
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return (data[0], decoded)
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def encode(hrp, witver, witprog):
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"""Encode a segwit address."""
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ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5))
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if decode(hrp, ret) == (None, None):
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return None
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return ret
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133
tests/test_trezor.crypto.bech32.py
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133
tests/test_trezor.crypto.bech32.py
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@ -0,0 +1,133 @@
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# Copyright (c) 2017 Pieter Wuille
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""Reference tests for segwit adresses"""
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from common import *
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from trezor.crypto import bech32
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def segwit_scriptpubkey(witver, witprog):
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"""Construct a Segwit scriptPubKey for a given witness program."""
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return bytes([witver + 0x50 if witver else 0, len(witprog)] + witprog)
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VALID_CHECKSUM = [
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"A12UEL5L",
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"an83characterlonghumanreadablepartthatcontainsthenumber1andtheexcludedcharactersbio1tt5tgs",
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"abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw",
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"11qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqc8247j",
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"split1checkupstagehandshakeupstreamerranterredcaperred2y9e3w",
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]
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INVALID_CHECKSUM = [
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" 1nwldj5",
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"\x7F" + "1axkwrx",
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"an84characterslonghumanreadablepartthatcontainsthenumber1andtheexcludedcharactersbio1569pvx",
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"pzry9x0s0muk",
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"1pzry9x0s0muk",
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"x1b4n0q5v",
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"li1dgmt3",
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"de1lg7wt\xff",
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]
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VALID_ADDRESS = [
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["BC1QW508D6QEJXTDG4Y5R3ZARVARY0C5XW7KV8F3T4", "0014751e76e8199196d454941c45d1b3a323f1433bd6"],
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["tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3q0sl5k7",
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"00201863143c14c5166804bd19203356da136c985678cd4d27a1b8c6329604903262"],
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["bc1pw508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7k7grplx",
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"5128751e76e8199196d454941c45d1b3a323f1433bd6751e76e8199196d454941c45d1b3a323f1433bd6"],
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["BC1SW50QA3JX3S", "6002751e"],
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["bc1zw508d6qejxtdg4y5r3zarvaryvg6kdaj", "5210751e76e8199196d454941c45d1b3a323"],
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["tb1qqqqqp399et2xygdj5xreqhjjvcmzhxw4aywxecjdzew6hylgvsesrxh6hy",
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"0020000000c4a5cad46221b2a187905e5266362b99d5e91c6ce24d165dab93e86433"],
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]
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INVALID_ADDRESS = [
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"tc1qw508d6qejxtdg4y5r3zarvary0c5xw7kg3g4ty",
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"bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t5",
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"BC13W508D6QEJXTDG4Y5R3ZARVARY0C5XW7KN40WF2",
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"bc1rw5uspcuh",
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"bc10w508d6qejxtdg4y5r3zarvary0c5xw7kw508d6qejxtdg4y5r3zarvary0c5xw7kw5rljs90",
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"BC1QR508D6QEJXTDG4Y5R3ZARVARYV98GJ9P",
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"tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3q0sL5k7",
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"bc1zw508d6qejxtdg4y5r3zarvaryvqyzf3du",
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"tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3pjxtptv",
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"bc1gmk9yu",
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]
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INVALID_ADDRESS_ENC = [
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("BC", 0, 20),
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("bc", 0, 21),
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("bc", 17, 32),
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("bc", 1, 1),
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("bc", 16, 41),
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]
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class TestCryptoBech32(unittest.TestCase):
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"""Unit test class for segwit addressess."""
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def test_valid_checksum(self):
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"""Test checksum creation and validation."""
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for test in VALID_CHECKSUM:
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hrp, _ = bech32.bech32_decode(test)
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self.assertIsNotNone(hrp)
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pos = test.rfind('1')
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test = test[:pos+1] + chr(ord(test[pos + 1]) ^ 1) + test[pos+2:]
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hrp, _ = bech32.bech32_decode(test)
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self.assertIsNone(hrp)
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def test_invalid_checksum(self):
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"""Test validation of invalid checksums."""
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for test in INVALID_CHECKSUM:
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hrp, _ = bech32.bech32_decode(test)
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self.assertIsNone(hrp)
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def test_valid_address(self):
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"""Test whether valid addresses decode to the correct output."""
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for (address, hexscript) in VALID_ADDRESS:
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hrp = "bc"
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witver, witprog = bech32.decode(hrp, address)
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if witver is None:
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hrp = "tb"
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witver, witprog = bech32.decode(hrp, address)
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self.assertIsNotNone(witver)
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scriptpubkey = segwit_scriptpubkey(witver, witprog)
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self.assertEqual(scriptpubkey, unhexlify(hexscript))
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addr = bech32.encode(hrp, witver, witprog)
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self.assertEqual(address.lower(), addr)
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def test_invalid_address(self):
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"""Test whether invalid addresses fail to decode."""
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for test in INVALID_ADDRESS:
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witver, _ = bech32.decode("bc", test)
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self.assertIsNone(witver)
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witver, _ = bech32.decode("tb", test)
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self.assertIsNone(witver)
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def test_invalid_address_enc(self):
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"""Test whether address encoding fails on invalid input."""
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for hrp, version, length in INVALID_ADDRESS_ENC:
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code = bech32.encode(hrp, version, [0] * length)
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self.assertIsNone(code)
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if __name__ == "__main__":
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unittest.main()
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