def checkd_data_sig(self,sig,pre,pk):
sec, compressed = self.keypair.get(pk)
pre_hash = Hash(pre)
pkey = regenerate_key(sec)
secexp = pkey.secret
private_key = MySigningKey.from_secret_exponent(secexp, curve=ecdsa.SECP256k1)
public_key = private_key.get_verifying_key()
print("Data signature ok:")
print(public_key.verify_digest(sig[:-1], pre_hash, sigdecode=ecdsa.util.sigdecode_der))
def get_transaction_signature(self, tx, sk, vk):
txin = list(filter(lambda x: vk in x['pubkeys'], tx.inputs()))
if txin:
tx_num = tx.inputs().index(txin[0])
pre_hash = Hash(bfh(tx.serialize_preimage(tx_num)))
private_key = MySigningKey.from_secret_exponent(sk.secret, 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)
assert public_key.verify_digest(sig, pre_hash, sigdecode = ecdsa.util.sigdecode_der)
result = bh2u(sig) + int_to_hex(tx.nHashType() & 255, 1)
return result.encode('utf-8')
return b''
def get_transaction_signature(transaction, inputs, secret_keys):
"get transaction signature"
signatures = {}
for txin in transaction.inputs():
pubkey = txin['pubkeys'][0]
if pubkey in inputs:
tx_num = transaction.inputs().index(txin)
pre_hash = Hash(bfh(transaction.serialize_preimage(tx_num)))
private_key = MySigningKey.from_secret_exponent(secret_keys[pubkey].secret, 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)
assert public_key.verify_digest(sig, pre_hash, sigdecode=ecdsa.util.sigdecode_der)
signatures[txin['tx_hash'] + ":" + str(txin['tx_pos'])] = (bh2u(sig) + int_to_hex(transaction.nHashType() & 255, 1)).encode('utf-8')
return signatures