From 3bef51eec2299403467e621ae660cef3f9256ac8 Mon Sep 17 00:00:00 2001 From: Determinant Date: Tue, 17 Nov 2020 18:47:40 -0500 Subject: update frozen deps --- freezed_deps/bech32.py | 123 ------------------------------------------------- 1 file changed, 123 deletions(-) delete mode 100644 freezed_deps/bech32.py (limited to 'freezed_deps/bech32.py') diff --git a/freezed_deps/bech32.py b/freezed_deps/bech32.py deleted file mode 100644 index d450080..0000000 --- a/freezed_deps/bech32.py +++ /dev/null @@ -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)) - if decode(hrp, ret) == (None, None): - return None - return ret -- cgit v1.2.3-70-g09d2