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41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
from typing import List
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from .core.b_dhke import step2_bob
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from .core.base import BlindedSignature
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from .core.secp import PublicKey
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from .mint_helper import derive_key, derive_keys, derive_pubkeys
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# todo: extract const
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MAX_ORDER = 64
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def get_pubkeys(xpriv: str):
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"""Returns public keys for possible amounts."""
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keys = derive_keys(xpriv)
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pub_keys = derive_pubkeys(keys)
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return {a: p.serialize().hex() for a, p in pub_keys.items()}
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async def generate_promises(
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master_prvkey: str, amounts: List[int], B_s: List[PublicKey]
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):
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"""Mints a promise for coins for B_."""
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for amount in amounts:
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if amount not in [2**i for i in range(MAX_ORDER)]:
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raise Exception(f"Can only mint amounts up to {2**MAX_ORDER}.")
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promises = [
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await generate_promise(master_prvkey, amount, B_)
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for B_, amount in zip(B_s, amounts)
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]
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return promises
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async def generate_promise(master_prvkey: str, amount: int, B_: PublicKey):
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"""Generates a promise for given amount and returns a pair (amount, C')."""
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secret_key = derive_key(master_prvkey, amount) # Get the correct key
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C_ = step2_bob(B_, secret_key)
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return BlindedSignature(amount=amount, C_=C_.serialize().hex())
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