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Diffstat (limited to 'scripts/bech32.py')
| -rw-r--r-- | scripts/bech32.py | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/scripts/bech32.py b/scripts/bech32.py new file mode 100644 index 0000000..6851efc --- /dev/null +++ b/scripts/bech32.py @@ -0,0 +1,84 @@ +import hashlib +from typing import Iterable, List, Optional, Tuple, Union + +BECH32A_ALPHABET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l" + +def convertbits(data: Iterable[int], frombits: int, tobits: int, pad: bool = True) -> Optional[List[int]]: + """General power-of-2 base conversion.""" + acc = 0 + bits = 0 + ret = [] + maxv = (1 << tobits) - 1 + max_acc = (1 << (frombits + tobits - 1)) - 1 + + print(f"maxv: {maxv}") + print(f"max_acc: {max_acc}") + + 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 bech32_polymod(values): + GEN = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3] + chk = 1 + for v in values: + b = (chk >> 25) + chk = (chk & 0x1ffffff) << 5 ^ v + for i in range(5): + chk ^= GEN[i] if ((b >> i) & 1) else 0 + return chk + +def bech32_hrp_expand(s): + return [ord(x) >> 5 for x in s] + [0] + [ord(x) & 31 for x in s] + +def bech32_verify_checksum(hrp, data): + polymod = bech32_polymod(bech32_hrp_expand(hrp) + data) + print("polymod", polymod) + return polymod == 1 + +def bech32_create_checksum(hrp, 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)] + + +pubkey = 0x0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 + + +sha256 = hashlib.sha256() +sha256.update(pubkey.to_bytes(length=33)) + +sha265_pubkey = sha256.hexdigest() +print(sha265_pubkey) + +ripemd160 = hashlib.new('ripemd160') +ripemd160.update(sha256.digest()) +riped_sha256_pubkey = ripemd160.digest() +print(ripemd160.hexdigest()) + +squashed = convertbits(riped_sha256_pubkey, 8, 5) +squashed.insert(0, 0) + +checksum = bech32_create_checksum(hrp="bc", data=squashed) +print(checksum) +squashed.extend(checksum) + +encoded = "" +print(squashed) +for i in squashed: + encoded += BECH32A_ALPHABET[i] + +bech32_addr = "bc" + "1" + encoded +print(bech32_addr) +assert bech32_addr == "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4"
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