fix: hashlib usage for FIPS (#280)

fix usage of hashlib for FIPS

Signed-off-by: Michele Dolfi <[email protected]>

Author: dolfim-ibm

docling_core/types/doc/document.py

@@ -1073,7 +1073,7 @@ def _image_to_hexhash(self) -> Optional[str]:
             image_bytes = self.image._pil.tobytes()
 
             # Create a hash object (e.g., SHA-256)
-            hasher = hashlib.sha256()
+            hasher = hashlib.sha256(usedforsecurity=False)
 
             # Feed the image bytes into the hash object
             hasher.update(image_bytes)

docling_core/utils/legacy.py

@@ -47,7 +47,7 @@
 
 
 def _create_hash(string: str):
-    hasher = hashlib.sha256()
+    hasher = hashlib.sha256(usedforsecurity=False)
     hasher.update(string.encode("utf-8"))
 
     return hasher.hexdigest()