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trezor-core
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signtx: unify input script derivation

This commit is contained in:
Jan Pochyla 2016-11-14 11:01:21 +01:00
parent 5889d0c932
commit ed8973e86d
1 changed files with 7 additions and 15 deletions
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22
src/apps/common/signtx.py
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@ -158,7 +158,6 @@ async def sign_tx(tx: SignTx, root):
for i_sign in range(tx_inputs_count):
# hash of what we are signing with this input
h_sign = HashWriter(sha256)
# h_sign = BufferWriter()
# same as h_first, checked at the end of this iteration
h_second = HashWriter(sha256)
@ -178,8 +177,7 @@ async def sign_tx(tx: SignTx, root):
txi_sign = txi
key_sign = node_derive(root, txi.address_n)
key_sign_pub = key_sign.public_key()
txi.script_sig = input_derive_script_pre_sign(
txi, key_sign_pub)
txi.script_sig = input_derive_script(txi, key_sign_pub)
else:
txi.script_sig = bytes()
write_tx_input(h_sign, txi)
@ -209,7 +207,7 @@ async def sign_tx(tx: SignTx, root):
tx_ser.signature = signature
# serialize input with correct signature
txi_sign.script_sig = input_derive_script_post_sign(
txi_sign.script_sig = input_derive_script(
txi_sign, key_sign_pub, signature)
w_txi_sign = bytearray()
if i_sign == 0: # serializing first input => prepend tx version and inputs count
@ -333,19 +331,13 @@ def output_is_change(o: TxOutputType):
# ===
def input_derive_script_pre_sign(i: TxInputType, pubkey: bytes) -> bytes:
def input_derive_script(i: TxInputType, pubkey: bytes, signature: bytes = None) -> bytes:
i_script_type = getattr(i, 'script_type', InputScriptType.SPENDADDRESS)
if i_script_type == InputScriptType.SPENDADDRESS:
return script_paytoaddress_new(ecdsa_hash_pubkey(pubkey))
else:
raise SigningError(FailureType.SyntaxError,
'Unknown input script type')
def input_derive_script_post_sign(i: TxInputType, pubkey: bytes, signature: bytes) -> bytes:
i_script_type = getattr(i, 'script_type', InputScriptType.SPENDADDRESS)
if i_script_type == InputScriptType.SPENDADDRESS:
return script_spendaddress_new(pubkey, signature)
if signature is None:
return script_paytoaddress_new(ecdsa_hash_pubkey(pubkey))
else:
return script_spendaddress_new(pubkey, signature)
else:
raise SigningError(FailureType.SyntaxError,
'Unknown input script type')