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Code Issues Releases Wiki Activity

signtx: minor refactoring

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This commit is contained in:
Jan Pochyla 2016-11-11 11:19:47 +01:00
parent 31e3aaa23b
commit 24d8a04131
1 changed files with 6 additions and 5 deletions
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11
src/apps/common/signtx.py
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@ -186,11 +186,11 @@ async def sign_tx(tx: SignTx, root):
write_uint32(h_sign, 0x00000001) # SIGHASH_ALL hash_type
# check the control digests
if tx_hash_digest(h_first, False) != tx_hash_digest(h_second, False):
if get_tx_hash(h_first, False) != get_tx_hash(h_second, False):
raise SigningError('Transaction has changed during signing')
# compute the signature from the tx digest
signature = ecdsa_sign(key_sign, tx_hash_digest(h_sign, True))
signature = ecdsa_sign(key_sign, get_tx_hash(h_sign, True))
tx_ser.signature_index = i_sign
tx_ser.signature = signature
@ -261,17 +261,18 @@ async def get_prevtx_output_value(tx_req: TxRequest, prev_hash: bytes, prev_inde
write_uint32(txh, tx_lock_time)
prev_hash_rev = bytes(reversed(prev_hash)) # TODO: improve performance
if tx_hash_digest(txh, True) != prev_hash_rev:
if get_tx_hash(txh, True, True) != prev_hash:
raise SigningError('Encountered invalid prev_hash')
return total_out
def tx_hash_digest(w, double: bool) -> bytes:
def get_tx_hash(w, double: bool, reverse: bool=False) -> bytes:
d = w.getvalue()
if double:
d = sha256(d).digest()
if reverse:
d = bytes(reversed(d))
return d