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e3ed00640f
* init flake8 * exclude nostr client, and add ds_store to gitignore * fix flake8 F811 issue, redefinition of unused variables * add flake8 to workflow * F401 unused imports * F541 f-string is missing placeholders * E501 line too long > 150 characters * E722 no bare except * E402 module level import not at top of file * F405 no star imports * E712 comparison to False should be 'if cond is False:' * F841 local variable is assigned to but never used * E266 too many leading '#' for block comment * E265, E261 * E713 test for membership should be 'not in' * E711, E741 E741 ambiguous variable name 'l' E711 comparison to None should be 'if cond is None:' * flake config * isort * refactor makefile flake8 usage * reflaking the rebase * black * fix tests? * black * fix line lenght it test_cli * sort out makefile * fix strings * reintroduce black-check * reflake and mypy * isort * Update cashu/wallet/wallet.py Co-authored-by: Angus Pearson <angus@toaster.cc> * Update cashu/mint/ledger.py Co-authored-by: Angus Pearson <angus@toaster.cc> --------- Co-authored-by: Angus Pearson <angus@toaster.cc>
52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
import hashlib
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from secp256k1 import PrivateKey, PublicKey
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from ..core.settings import settings
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def hash_to_point_pre_0_3_3(secret_msg):
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"""
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NOTE: Clients pre 0.3.3 used a different hash_to_curve
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Generates x coordinate from the message hash and checks if the point lies on the curve.
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If it does not, it tries computing again a new x coordinate from the hash of the coordinate.
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"""
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point = None
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msg = secret_msg
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while point is None:
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_hash = hashlib.sha256(msg).hexdigest().encode("utf-8") # type: ignore
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try:
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# We construct compressed pub which has x coordinate encoded with even y
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_hash = list(_hash[:33]) # take the 33 bytes and get a list of bytes
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_hash[0] = 0x02 # set first byte to represent even y coord
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_hash = bytes(_hash)
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point = PublicKey(_hash, raw=True)
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except Exception:
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msg = _hash
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return point
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def verify_pre_0_3_3(a, C, secret_msg):
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Y = hash_to_point_pre_0_3_3(secret_msg.encode("utf-8"))
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return C == Y.mult(a) # type: ignore
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def derive_keys_backwards_compatible_insecure_pre_0_12(
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master_key: str, derivation_path: str = ""
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):
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"""
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WARNING: Broken key derivation for backwards compatibility with 0.11.
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"""
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return {
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2
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** i: PrivateKey(
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hashlib.sha256((master_key + derivation_path + str(i)).encode("utf-8"))
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.hexdigest()
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.encode("utf-8")[:32],
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raw=True,
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)
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for i in range(settings.max_order)
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}
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