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https://github.com/aljazceru/nutshell.git
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f84028ca3f
* refactor nut14 * format * tests * update tests * more tests * format * adjust wallet tests -> 32 bytes preimages * format
38 lines
1.3 KiB
Python
38 lines
1.3 KiB
Python
import time
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from hashlib import sha256
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from ..base import Proof
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from ..errors import TransactionError
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from ..htlc import HTLCSecret
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from ..secret import Secret, SecretKind
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def verify_htlc_spending_conditions(
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proof: Proof,
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) -> bool:
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"""
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Verifies an HTLC spending condition.
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Either the preimage is provided or the locktime has passed and a refund is requested.
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"""
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secret = Secret.deserialize(proof.secret)
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if not secret.kind or secret.kind != SecretKind.HTLC.value:
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raise TransactionError("not an HTLC secret.")
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htlc_secret = HTLCSecret.from_secret(secret)
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# hash lock
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if not proof.htlcpreimage:
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raise TransactionError("no HTLC preimage provided")
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# verify correct preimage (the hashlock) if the locktime hasn't passed
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now = time.time()
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if not htlc_secret.locktime or htlc_secret.locktime > now:
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try:
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if len(proof.htlcpreimage) != 64:
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raise TransactionError("HTLC preimage must be 64 characters hex.")
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if not sha256(
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bytes.fromhex(proof.htlcpreimage)
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).digest() == bytes.fromhex(htlc_secret.data):
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raise TransactionError("HTLC preimage does not match.")
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except ValueError:
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raise TransactionError("invalid preimage for HTLC: not a hex string.")
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return True
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