python: adapt to changed/new APrimeFE.from_{int,bytes}... API

Author: theStack

python/chilldkg_ref/chilldkg.py

@@ -392,7 +392,7 @@ def deserialize_recovery_data(
     if len(rest) < 32 * n:
         raise ValueError
     enc_secshares, rest = (
-        [Scalar.from_bytes(rest[i : i + 32]) for i in range(0, 32 * n, 32)],
+        [Scalar.from_bytes_checked(rest[i : i + 32]) for i in range(0, 32 * n, 32)],
         rest[32 * n :],
     )
 

python/chilldkg_ref/encpedpop.py

@@ -3,7 +3,6 @@
 from secp256k1lab.secp256k1 import Scalar, GE
 from secp256k1lab.ecdh import ecdh_libsecp256k1
 from secp256k1lab.keys import pubkey_gen_plain
-from secp256k1lab.util import int_from_bytes
 
 from . import simplpedpop
 from .util import (
@@ -29,15 +28,13 @@ def ecdh(
         data += their_pubkey + my_pubkey
     assert len(data) == 32 + 2 * 33
     data += context
-    return Scalar(int_from_bytes(tagged_hash_bip_dkg("encpedpop ecdh", data)))
+    return Scalar.from_bytes_wrapping(tagged_hash_bip_dkg("encpedpop ecdh", data))
 
 
 def self_pad(symkey: bytes, nonce: bytes, context: bytes) -> Scalar:
     # Pad for symmetric encryption to ourselves
-    return Scalar(
-        int_from_bytes(
-            tagged_hash_bip_dkg("encaps_multi self_pad", symkey + nonce + context)
-        )
+    return Scalar.from_bytes_wrapping(
+        tagged_hash_bip_dkg("encaps_multi self_pad", symkey + nonce + context)
     )
 
 

python/chilldkg_ref/vss.py

@@ -95,7 +95,7 @@ def invalid_taproot_commit(self) -> Tuple[VSSCommitment, Scalar, GE]:
         # The function returns the updated VSS commitment and the tweak `t` which
         # must be added to all secret shares of the commitment.
         pk = self.commitment_to_secret()
-        secshare_tweak = Scalar.from_bytes(
+        secshare_tweak = Scalar.from_bytes_checked(
             tagged_hash("TapTweak", pk.to_bytes_compressed())
         )
         pubshare_tweak = secshare_tweak * G
@@ -112,7 +112,7 @@ def __init__(self, f: Polynomial) -> None:
     @staticmethod
     def generate(seed: bytes, t: int) -> VSS:
         coeffs = [
-            Scalar.from_bytes(
+            Scalar.from_bytes_checked(
                 tagged_hash_bip_dkg("vss coeffs", seed + i.to_bytes(4, byteorder="big"))
             )
             for i in range(t)

python/tests.py

@@ -312,7 +312,7 @@ def test_correctness_dkg_output(t, n, dkg_outputs: List[simplpedpop.DKGOutput]):
 
     # Check that each secshare matches the corresponding pubshare
     secshares_scalar = [
-        None if secshare is None else Scalar.from_bytes(secshare)
+        None if secshare is None else Scalar.from_bytes_checked(secshare)
         for secshare in secshares
     ]
     for i in range(1, n + 1):