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@ -7,6 +7,7 @@ from trezor.enums import DecredStakingSpendType, InputScriptType
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from trezor.messages import PrevOutput
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from trezor.utils import HashWriter, ensure
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from apps.bitcoin.sign_tx.tx_weight import TxWeightCalculator
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from apps.common.writers import write_compact_size
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from .. import multisig, scripts_decred, writers
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@ -40,7 +41,53 @@ if TYPE_CHECKING:
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from .sig_hasher import SigHasher
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# Decred input size (without script): 32 prevhash, 4 idx, 1 Decred tree, 4 sequence
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_TXSIZE_DECRED_INPUT = const(41)
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# Decred script version: 2 bytes
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_TXSIZE_DECRED_SCRIPT_VERSION = const(2)
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# Decred expiry size: 4 bytes in footer
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_TXSIZE_DECRED_EXPIRY = const(4)
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# Decred witness size (without script): 8 byte amount, 4 byte block height, 4 byte block index
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_TXSIZE_DECRED_WITNESS = 16
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class DecredTxWeightCalculator(TxWeightCalculator):
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def get_base_weight(self) -> int:
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base_weight = super().get_base_weight()
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base_weight += 4 * _TXSIZE_DECRED_EXPIRY
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# Add witness input count.
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base_weight += 4 * self.compact_size_len(self.inputs_count)
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return base_weight
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def add_input(self, i: TxInput) -> None:
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self.inputs_count += 1
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# Input.
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self.counter += 4 * _TXSIZE_DECRED_INPUT
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# Input witness.
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input_script_size = self.input_script_size(i)
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if i.script_type == InputScriptType.SPENDMULTISIG:
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# Decred fixed the the OP_FALSE bug in multisig.
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input_script_size -= 1 # Subtract one OP_FALSE byte.
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self.counter += 4 * _TXSIZE_DECRED_WITNESS
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self.counter += 4 * self.compact_size_len(input_script_size)
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self.counter += 4 * input_script_size
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def add_output(self, script: bytes) -> None:
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super().add_output(script)
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self.counter += 4 * _TXSIZE_DECRED_SCRIPT_VERSION
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class DecredApprover(BasicApprover):
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def __init__(self, tx: SignTx, coin: CoinInfo) -> None:
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super().__init__(tx, coin)
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self.weight = DecredTxWeightCalculator()
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async def add_decred_sstx_submission(
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self, txo: TxOutput, script_pubkey: bytes
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) -> None:
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Andrew Kozlik
2 years ago
committed by