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transaction.py: sign_txin. allow override for get_preimage_script.

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SomberNight 2018-04-23 13:52:20 +02:00
parent 1d6f000868
commit 97296432a2
No known key found for this signature in database
GPG key ID: B33B5F232C6271E9
1 changed files with 17 additions and 9 deletions
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26
lib/transaction.py
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@ -820,6 +820,10 @@ class Transaction:
@classmethod
def get_preimage_script(self, txin):
preimage_script = txin.get('preimage_script', None)
if preimage_script is not None:
return preimage_script
pubkeys, x_pubkeys = self.get_sorted_pubkeys(txin)
if txin['type'] == 'p2pkh':
return bitcoin.address_to_script(txin['address'])
@ -1041,15 +1045,7 @@ class Transaction:
sec, compressed = keypairs.get(x_pubkey)
pubkey = public_key_from_private_key(sec, compressed)
# add signature
pre_hash = Hash(bfh(self.serialize_preimage(i)))
pkey = regenerate_key(sec)
secexp = pkey.secret
private_key = bitcoin.MySigningKey.from_secret_exponent(secexp, curve = SECP256k1)
public_key = private_key.get_verifying_key()
sig = private_key.sign_digest_deterministic(pre_hash, hashfunc=hashlib.sha256, sigencode = ecdsa.util.sigencode_der)
if not public_key.verify_digest(sig, pre_hash, sigdecode = ecdsa.util.sigdecode_der):
raise Exception('Sanity check verifying our own signature failed.')
sig = bh2u(sig) + '01'
sig = self.sign_txin(i, sec)
self.add_signature_to_txin(txin, j, sig)
#txin['x_pubkeys'][j] = pubkey
txin['pubkeys'][j] = pubkey # needed for fd keys
@ -1057,6 +1053,18 @@ class Transaction:
print_error("is_complete", self.is_complete())
self.raw = self.serialize()
def sign_txin(self, txin_index, privkey_bytes):
pre_hash = Hash(bfh(self.serialize_preimage(txin_index)))
pkey = regenerate_key(privkey_bytes)
secexp = pkey.secret
private_key = bitcoin.MySigningKey.from_secret_exponent(secexp, curve=SECP256k1)
public_key = private_key.get_verifying_key()
sig = private_key.sign_digest_deterministic(pre_hash, hashfunc=hashlib.sha256, sigencode=ecdsa.util.sigencode_der)
if not public_key.verify_digest(sig, pre_hash, sigdecode=ecdsa.util.sigdecode_der):
raise Exception('Sanity check verifying our own signature failed.')
sig = bh2u(sig) + '01'
return sig
def get_outputs(self):
"""convert pubkeys to addresses"""
o = []