Correct

btclib_libsecp256k1/dsa.py

@@ -12,8 +12,8 @@
 
 def sign(
     msg_bytes: bytes, prvkey: Union[bytes, int], ndata: Optional[bytes] = None
-) -> int:
-    "Creates an ECDSA signature."
+) -> bytes:
+    "Create an ECDSA signature."
 
     if isinstance(prvkey, int):
         prvkey_bytes = prvkey.to_bytes(32, "big")
@@ -29,14 +29,14 @@ def sign(
         ndata = secrets.token_bytes(32)
     ndata = b"\x00" * (32 - len(ndata)) + ndata
     if not lib.secp256k1_ecdsa_sign(ctx, sig, msg_bytes, prvkey_bytes, null, ndata):
-        return 0
+        raise Exception
     if not lib.secp256k1_ecdsa_signature_serialize_der(ctx, sig_bytes, length, sig):
-        return 0
+        raise Exception
     return ffi.unpack(sig_bytes, length[0])
 
 
 def verify(msg_bytes: bytes, pubkey_bytes: bytes, signature_bytes: bytes) -> int:
-    "Verifies a ECDSA signature"
+    "Verify a ECDSA signature"
 
     signature = ffi.new("secp256k1_ecdsa_signature *")
     lib.secp256k1_ecdsa_signature_parse_der(

btclib_libsecp256k1/ssa.py

@@ -13,8 +13,8 @@
 
 def sign(
     msg_bytes: bytes, prvkey: Union[bytes, int], aux_rand32: Optional[bytes] = None
-) -> int:
-    "Creates a Schhnorr signature"
+) -> bytes:
+    "Create a Schhnorr signature"
 
     if isinstance(prvkey, int):
         prvkey_bytes = prvkey.to_bytes(32, "big")
@@ -31,11 +31,11 @@ def sign(
     aux_rand32 = b"\x00" * (32 - len(aux_rand32)) + aux_rand32
     if lib.secp256k1_schnorrsig_sign(ctx, sig, msg_bytes, keypair, aux_rand32):
         return ffi.unpack(sig, 64)
-    return 0
+    raise Exception
 
 
 def verify(msg_bytes: bytes, pubkey_bytes: bytes, signature_bytes: bytes) -> int:
-    "Verifies a Schhnorr signature"
+    "Verify a Schhnorr signature"
 
     if len(pubkey_bytes) == 32:
         pubkey_bytes = b"\x02" + pubkey_bytes

pyproject.toml

@@ -15,4 +15,4 @@ max-line-length = 100
 [tool.pylint.master]
 extension-pkg-whitelist="_btclib_libsecp256k1"
 min-similarity-lines=6
-disable = ["duplicate-code"  # R0801]
+disable = ["duplicate-code"]  # R0801