Migrate requires_hashdigest() to helper

Lib/test/support/__init__.py

@@ -88,7 +88,7 @@ __all__ = [
     "create_empty_file", "can_symlink", "fs_is_case_insensitive",
     # unittest
     "is_resource_enabled", "requires", "requires_freebsd_version",
-    "requires_linux_version", "requires_mac_ver", "requires_hashdigest",
+    "requires_linux_version", "requires_mac_ver",
     "check_syntax_error", "check_syntax_warning",
     "TransientResource", "time_out", "socket_peer_reset", "ioerror_peer_reset",
     "transient_internet", "BasicTestRunner", "run_unittest", "run_doctest",
@@ -588,35 +588,6 @@ def skip_if_buildbot(reason=None):
         isbuildbot = os.environ.get('USER') == 'buildbot'
     return unittest.skipIf(isbuildbot, reason)
 
-def requires_hashdigest(digestname, openssl=None):
-    """Decorator raising SkipTest if a hashing algorithm is not available
-
-    The hashing algorithm could be missing or blocked by a strict crypto
-    policy.
-
-    If 'openssl' is True, then the decorator checks that OpenSSL provides
-    the algorithm. Otherwise the check falls back to built-in
-    implementations.
-
-    ValueError: [digital envelope routines: EVP_DigestInit_ex] disabled for FIPS
-    ValueError: unsupported hash type md4
-    """
-    def decorator(func):
-        @functools.wraps(func)
-        def wrapper(*args, **kwargs):
-            try:
-                if openssl and _hashlib is not None:
-                    _hashlib.new(digestname)
-                else:
-                    hashlib.new(digestname)
-            except ValueError:
-                raise unittest.SkipTest(
-                    f"hash digest '{digestname}' is not available."
-                )
-            return func(*args, **kwargs)
-        return wrapper
-    return decorator
-
 
 HOST = "localhost"
 HOSTv4 = "127.0.0.1"

Lib/test/test_tarfile.py

@@ -11,7 +11,8 @@ import unittest.mock
 import tarfile
 
 from test import support
-from test.support import script_helper, requires_hashdigest, os_helper
+from test.support import os_helper
+from test.support import script_helper
 
 # Check for our compression modules.
 try:

Lib/test/test_urllib2_localnet.py

@@ -9,6 +9,7 @@ import unittest
 import hashlib
 
 from test import support
+from test.support import hashlib_helper
 
 try:
     import ssl
@@ -315,6 +316,7 @@ class BasicAuthTests(unittest.TestCase):
         self.assertRaises(urllib.error.HTTPError, urllib.request.urlopen, self.server_url)
 
 
+@hashlib_helper.requires_hashdigest("md5", openssl=True)
 class ProxyAuthTests(unittest.TestCase):
     URL = "http://localhost"
 
@@ -322,7 +324,6 @@ class ProxyAuthTests(unittest.TestCase):
     PASSWD = "test123"
     REALM = "TestRealm"
 
-    @support.requires_hashdigest("md5")
     def setUp(self):
         super(ProxyAuthTests, self).setUp()
         # Ignore proxy bypass settings in the environment.