funga-eth/funga/eth/encoding.py

92 lines
2.4 KiB
Python
Raw Permalink Normal View History

2021-10-10 18:14:34 +02:00
# standard imports
import logging
# external imports
import coincurve
import sha3
from hexathon import (
strip_0x,
uniform,
)
logg = logging.getLogger(__name__)
def private_key_from_bytes(b):
return coincurve.PrivateKey(secret=b)
def public_key_bytes_to_address(pubk_bytes, result_format='hex'):
h = sha3.keccak_256()
logg.debug('public key bytes {}'.format(pubk_bytes.hex()))
h.update(pubk_bytes[1:])
z = h.digest()[12:]
if result_format == 'hex':
return to_checksum_address(z[:20].hex())
elif result_format == 'bytes':
return z[:20]
raise ValueError('invalid result format "{}"'.format(result_format))
def public_key_to_address(pubk, result_format='hex'):
pubk_bytes = pubk.format(compressed=False)
return public_key_bytes_to_address(pubk_bytes, result_format='hex')
def private_key_to_address(pk, result_format='hex'):
pubk = coincurve.PublicKey.from_secret(pk.secret)
#logg.debug('secret {} '.format(pk.secret.hex()))
return public_key_to_address(pubk, result_format)
def is_address(address_hex):
try:
address_hex = strip_0x(address_hex)
except ValueError:
return False
return len(address_hex) == 40
def is_checksum_address(address_hex):
hx = None
try:
hx = to_checksum(address_hex)
except ValueError:
return False
return hx == strip_0x(address_hex)
def to_checksum_address(address_hex):
address_hex = strip_0x(address_hex)
address_hex = uniform(address_hex)
if len(address_hex) != 40:
raise ValueError('Invalid address length')
h = sha3.keccak_256()
h.update(address_hex.encode('utf-8'))
z = h.digest()
#checksum_address_hex = '0x'
checksum_address_hex = ''
for (i, c) in enumerate(address_hex):
if c in '1234567890':
checksum_address_hex += c
elif c in 'abcdef':
if z[int(i / 2)] & (0x80 >> ((i % 2) * 4)) > 1:
checksum_address_hex += c.upper()
else:
checksum_address_hex += c
return checksum_address_hex
to_checksum = to_checksum_address
ethereum_recid_modifier = 35
def chain_id_to_v(chain_id, signature):
v = signature[64]
return (chain_id * 2) + ethereum_recid_modifier + v
def chainv_to_v(chain_id, v):
return v - ethereum_recid_modifier - (chain_id * 2)