ENH: remove xxhash dependency

pyproject.toml

@@ -111,7 +111,6 @@ test = [
     "pytest-cov",
     "pytest-profiling",
     "pytest-xdist",
-    "xxhash",
 ]
 types = [
     "ipython",
@@ -120,7 +119,6 @@ types = [
     "sphinx-api-relink",
     "types-PyYAML",
     "types-setuptools",
-    "xxhash",
 ]
 
 [tool.setuptools]

tests/unit/test_topology.py

@@ -1,8 +1,8 @@
+import hashlib
 import pickle  # noqa: S403
 import typing
 
 import pytest
-import xxhash
 from attrs.exceptions import FrozenInstanceError
 from IPython.lib.pretty import pretty
 
@@ -325,7 +325,7 @@ def test_create_n_body_topology(n_initial: int, n_final: int, exception):
 
 def _compute_hash(obj) -> str:
     b = _to_bytes(obj)
-    h = xxhash.xxh128(b)
+    h = hashlib.md5(b)  # noqa: S324
     return h.hexdigest()
 
 

tests/unit/test_transition.py

@@ -1,10 +1,10 @@
 # pyright: reportUnusedImport=false
+import hashlib
 import pickle  # noqa: S403
 from copy import deepcopy
 from fractions import Fraction
 
 import pytest
-import xxhash
 from IPython.lib.pretty import pretty
 
 from qrules.particle import Parity, Particle, ParticleCollection, Spin  # noqa: F401
@@ -48,8 +48,8 @@ def test_hash(self, reaction: ReactionInfo):
 
     def test_xxhash(self, reaction: ReactionInfo):
         expected_hash = {
-            "canonical-helicity": "de995528a15267dd3a72fe6c5dfa6136",
-            "helicity": "61c08ea813390cfbae8b083a89a5673a",
+            "canonical-helicity": "65106a44301f9340e633d09f66ad7d17",
+            "helicity": "9646d3ee5c5e8534deb8019435161f2e",
         }[reaction.formalism]
         assert _compute_hash(reaction) == expected_hash
 
@@ -119,7 +119,7 @@ def test_regex_pattern(self):
 
 def _compute_hash(obj) -> str:
     b = _to_bytes(obj)
-    h = xxhash.xxh128(b)
+    h = hashlib.md5(b)  # noqa: S324
     return h.hexdigest()