Use pulp_hashlib in receive_artifact()

Replace raw hashlib with pulp_hashlib.new() so that
digest creation goes through the allowed-algorithm gate
and works on FIPS-enabled systems.

closes #2256

Signed-off-by: Kush Gupta <kushalgupta@gmail.com>
Made-with: Cursor

Author: kush-gupt

CHANGES/2256.bugfix

@@ -0,0 +1 @@
+Used ``pulp_hashlib.new()`` instead of raw ``hashlib`` in ``receive_artifact()`` to fix ``UnsupportedDigestmodError`` on FIPS-enabled systems.

pulp_container/app/registry_api.py

@@ -26,6 +26,7 @@
 
 from django.conf import settings
 
+from pulpcore.plugin import pulp_hashlib
 from pulpcore.plugin.models import Artifact, ContentArtifact, UploadChunk
 from pulpcore.plugin.files import PulpTemporaryUploadedFile
 from pulpcore.plugin.tasking import dispatch
@@ -1452,7 +1453,7 @@ def receive_artifact(self, chunk):
             size = 0
             hashers = {}
             for algorithm in Artifact.DIGEST_FIELDS:
-                hashers[algorithm] = getattr(hashlib, algorithm)()
+                hashers[algorithm] = pulp_hashlib.new(algorithm)
             while True:
                 subchunk = chunk.read(2000000)
                 if not subchunk: