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Implement BIP-LI01.

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No more need to randomly place change.
This commit is contained in:
Neil Booth
2015-06-06 20:45:07 +09:00
parent 0b874b2bb0
commit 98bea614d8
2 changed files with 11 additions and 8 deletions
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15
lib/wallet.py
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@@ -898,27 +898,26 @@ class Abstract_Wallet(object):
# if change is above dust threshold, add a change output.
change_amount = total - ( amount + fee )
if fixed_fee is not None and change_amount > 0:
# Insert the change output at a random position in the outputs
posn = random.randint(0, len(tx.outputs))
tx.outputs[posn:posn] = [( 'address', change_addr, change_amount)]
tx.outputs.append(('address', change_addr, change_amount))
elif change_amount > DUST_THRESHOLD:
# Insert the change output at a random position in the outputs
posn = random.randint(0, len(tx.outputs))
tx.outputs[posn:posn] = [( 'address', change_addr, change_amount)]
tx.outputs.append(('address', change_addr, change_amount))
# recompute fee including change output
fee = self.estimated_fee(tx)
# remove change output
tx.outputs.pop(posn)
tx.outputs.pop()
# if change is still above dust threshold, re-add change output.
change_amount = total - ( amount + fee )
if change_amount > DUST_THRESHOLD:
tx.outputs[posn:posn] = [( 'address', change_addr, change_amount)]
tx.outputs.append(('address', change_addr, change_amount))
print_error('change', change_amount)
else:
print_error('not keeping dust', change_amount)
else:
print_error('not keeping dust', change_amount)
# Sort the inputs and outputs deterministically
tx.BIP_LI01_sort()
run_hook('make_unsigned_transaction', tx)
return tx