def sign_p2pkh(tx, i, priv, pub, hashtype = SIGHASH_ALL):
assert isinstance(tx, dict)
i = int(i)
assert isinstance(priv, int)
assert isinstance(pub, bytes)
address = hashes.hash160(pub)
prev_script = script.make_p2pkh(address)
txhash = sighash(tx, i, prev_script, hashtype)
sig = ecdsa.sign(txhash, priv)
sig = ecdsa.serialize_sig(sig) + convert.int_to_byte(hashtype)
tx["ins"][i]["script"] = script.serialize([sig, pub])
def derive_xpub(k, i):
i = int(i)
if i >= 2**31:
raise Exception("Can't do private derivation on public key!")
pub = k['pub']
pub_ser = ecdsa.serialize_pub(pub)
hmacdata = pub_ser + convert.int_to_bytes(i, 4)
I = hmac.new(k['chaincode'], hmacdata, hashlib.sha512).digest()
return {
'depth': k['depth'] + 1,
'fingerprint': hashes.hash160(pub_ser)[:4],
'i': i,
'chaincode': I[32:],
'pub': ec.add(k['pub'], ecdsa.priv_to_pub(ecdsa.deserialize_priv(I[:32])))
}
def derive_xpriv(k, i):
i = int(i)
pub = ecdsa.priv_to_pub(k['priv'])
pub_ser = ecdsa.serialize_pub(pub)
priv_ser = ecdsa.serialize_priv(k['priv'])
if i >= 2**31:
hmacdata = b'\x00' + priv_ser + convert.int_to_bytes(i, 4)
else:
hmacdata = pub_ser + convert.int_to_bytes(i, 4)
I = hmac.new(k['chaincode'], hmacdata, hashlib.sha512).digest()
return {
'depth': k['depth'] + 1,
'fingerprint': hashes.hash160(pub_ser)[:4],
'i': i,
'chaincode': I[32:],
'priv': ec.add_scalar(k['priv'], ecdsa.deserialize_priv(I[:32]))
}
def pub_to_addr(pub):
assert isinstance(pub, bytes)
return hash_to_addr(hashes.hash160(pub))
