fix es256 sphix error

Author: sai-sunder-s

docs/conf.py

@@ -363,10 +363,11 @@
 
 def autodoc_skip_member_handler(app, what, name, obj, skip, options):
     """
-    Skips the RSASigner and RSAVerifier from the internal _cryptography_rsa module
-    if they are being documented under that internal module path,
-    as they are publicly exposed via google.auth.crypt.
+    Skips members from internal modules (like _cryptography_rsa or base)
+    if they are publicly exposed via a higher-level package (like google.auth.crypt),
+    to avoid duplicate documentation entries and ambiguous cross-references.
     """
+    # Handle RSASigner and RSAVerifier from _cryptography_rsa
     if name in ("RSASigner", "RSAVerifier") and hasattr(obj, "__module__"):
         if obj.__module__ == "google.auth.crypt._cryptography_rsa":
             # Check if it's also available via the public google.auth.crypt path
@@ -378,6 +379,18 @@ def autodoc_skip_member_handler(app, what, name, obj, skip, options):
                     return True  # Skip this internal one
             except ImportError:
                 pass  # Should not happen if the library is installed
+
+    # Handle Signer and Verifier from base
+    elif name in ("Signer", "Verifier") and hasattr(obj, "__module__"):
+        if obj.__module__ == "google.auth.crypt.base":
+            # Check if it's also available via the public google.auth.crypt path
+            try:
+                import google.auth.crypt
+                public_obj = getattr(google.auth.crypt, name, None)
+                if public_obj is obj:
+                    return True # Skip this internal one
+            except ImportError:
+                pass # Should not happen if the library is installed
     return None  # Default behavior (don't skip)