mirror of
https://github.com/Chia-Network/chia-blockchain.git
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de05016ce0
* New aggregate signature conditions. * compute domain strings on the fly (but cache them) (#2) * Addendum to Arvid's idea. * Fix a typo. * more test coverage (#3) * Fix a typo. * Refactor final message creation logic into make_aggsig_final_message. * Cover make_aggsig_final_message exception cases. * Refactor processing spends' agg sig lists in pkm_pairs. * Construct a Coin out of a Spend and use it in make_aggsig_final_message. * Adopt Richard's dictionary trick to simplify make_aggsig_final_message. * Leverage make_aggsig_final_message in WalletTool's sign_transaction. --------- Co-authored-by: Arvid Norberg <arvid.norberg@gmail.com>
64 lines
2.8 KiB
Python
64 lines
2.8 KiB
Python
from __future__ import annotations
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import inspect
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from typing import Any, List
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import blspy
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from blspy import AugSchemeMPL
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from chia.types.coin_spend import CoinSpend
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from chia.types.spend_bundle import SpendBundle
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from chia.util.condition_tools import conditions_dict_for_solution, pkm_pairs_for_conditions_dict
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async def sign_coin_spends(
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coin_spends: List[CoinSpend],
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secret_key_for_public_key_f: Any, # Potentially awaitable function from G1Element => Optional[PrivateKey]
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additional_data: bytes,
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max_cost: int,
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) -> SpendBundle:
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"""
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Sign_coin_spends runs the puzzle code with the given argument and searches the
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result for an AGG_SIG_ME condition, which it attempts to sign by requesting a
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matching PrivateKey corresponding with the given G1Element (public key) specified
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in the resulting condition output.
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It's important to note that as mentioned in the documentation about the standard
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spend that the public key presented to the secret_key_for_public_key_f function
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provided to sign_coin_spends must be prepared to do the key derivations required
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by the coin types it's allowed to spend (at least the derivation of the standard
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spend as done by calculate_synthetic_secret_key with DEFAULT_PUZZLE_HASH).
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If a coin performed a different key derivation, the pk presented to this function
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would be similarly alien, and would need to be tried against the first stage
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derived keys (those returned by master_sk_to_wallet_sk from the ['sk'] member of
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wallet rpc's get_private_key method).
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"""
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signatures: List[blspy.G2Element] = []
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pk_list: List[blspy.G1Element] = []
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msg_list: List[bytes] = []
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for coin_spend in coin_spends:
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# Get AGG_SIG conditions
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conditions_dict = conditions_dict_for_solution(coin_spend.puzzle_reveal, coin_spend.solution, max_cost)
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# Create signature
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for pk_bytes, msg in pkm_pairs_for_conditions_dict(conditions_dict, coin_spend.coin, additional_data):
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pk = blspy.G1Element.from_bytes(pk_bytes)
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pk_list.append(pk)
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msg_list.append(msg)
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if inspect.iscoroutinefunction(secret_key_for_public_key_f):
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secret_key = await secret_key_for_public_key_f(pk)
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else:
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secret_key = secret_key_for_public_key_f(pk)
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if secret_key is None:
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e_msg = f"no secret key for {pk}"
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raise ValueError(e_msg)
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assert bytes(secret_key.get_g1()) == bytes(pk)
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signature = AugSchemeMPL.sign(secret_key, msg)
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assert AugSchemeMPL.verify(pk, msg, signature)
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signatures.append(signature)
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# Aggregate signatures
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aggsig = AugSchemeMPL.aggregate(signatures)
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assert AugSchemeMPL.aggregate_verify(pk_list, msg_list, aggsig)
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return SpendBundle(coin_spends, aggsig)
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