diff --git a/doc/source/misc.rst b/doc/source/misc.rst
index c418dd5ed5..4d4b3dcda6 100644
--- a/doc/source/misc.rst
+++ b/doc/source/misc.rst
@@ -39,6 +39,17 @@ Container Sync Realms
     :members:
     :show-inheritance:
 
+
+.. _digest:
+
+Digest
+======
+
+.. automodule:: swift.common.digest
+    :members:
+    :undoc-members:
+    :show-inheritance:
+
 .. _direct_client:
 
 Direct Client
diff --git a/swift/common/digest.py b/swift/common/digest.py
new file mode 100644
index 0000000000..34db19409b
--- /dev/null
+++ b/swift/common/digest.py
@@ -0,0 +1,151 @@
+# Copyright (c) 2022 NVIDIA
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import binascii
+import hashlib
+import hmac
+import six
+
+from swift.common.utils import strict_b64decode
+
+
+DEFAULT_ALLOWED_DIGESTS = 'sha1 sha256 sha512'
+DEPRECATED_DIGESTS = {'sha1'}
+SUPPORTED_DIGESTS = set(DEFAULT_ALLOWED_DIGESTS.split()) | DEPRECATED_DIGESTS
+
+
+def get_hmac(request_method, path, expires, key, digest="sha1",
+             ip_range=None):
+    """
+    Returns the hexdigest string of the HMAC (see RFC 2104) for
+    the request.
+
+    :param request_method: Request method to allow.
+    :param path: The path to the resource to allow access to.
+    :param expires: Unix timestamp as an int for when the URL
+                    expires.
+    :param key: HMAC shared secret.
+    :param digest: constructor or the string name for the digest to use in
+                   calculating the HMAC
+                   Defaults to SHA1
+    :param ip_range: The ip range from which the resource is allowed
+                     to be accessed. We need to put the ip_range as the
+                     first argument to hmac to avoid manipulation of the path
+                     due to newlines being valid in paths
+                     e.g. /v1/a/c/o\\n127.0.0.1
+    :returns: hexdigest str of the HMAC for the request using the specified
+              digest algorithm.
+    """
+    # These are the three mandatory fields.
+    parts = [request_method, str(expires), path]
+    formats = [b"%s", b"%s", b"%s"]
+
+    if ip_range:
+        parts.insert(0, ip_range)
+        formats.insert(0, b"ip=%s")
+
+    if not isinstance(key, six.binary_type):
+        key = key.encode('utf8')
+
+    message = b'\n'.join(
+        fmt % (part if isinstance(part, six.binary_type)
+               else part.encode("utf-8"))
+        for fmt, part in zip(formats, parts))
+
+    if six.PY2 and isinstance(digest, six.string_types):
+        digest = getattr(hashlib, digest)
+
+    return hmac.new(key, message, digest).hexdigest()
+
+
+def get_allowed_digests(conf_digests, logger=None):
+    """
+    Pulls out 'allowed_digests' from the supplied conf. Then compares them with
+    the list of supported and deprecated digests and returns whatever remain.
+
+    When something is unsupported or deprecated it'll log a warning.
+
+    :param conf_digests: iterable of allowed digests. If empty, defaults to
+        DEFAULT_ALLOWED_DIGESTS.
+    :param logger: optional logger; if provided, use it issue deprecation
+        warnings
+    :returns: A set of allowed digests that are supported and a set of
+        deprecated digests.
+    :raises: ValueError, if there are no digests left to return.
+    """
+    allowed_digests = set(digest.lower() for digest in conf_digests)
+    if not allowed_digests:
+        allowed_digests = SUPPORTED_DIGESTS
+
+    not_supported = allowed_digests - SUPPORTED_DIGESTS
+    if not_supported:
+        if logger:
+            logger.warning('The following digest algorithms are configured '
+                           'but not supported: %s', ', '.join(not_supported))
+        allowed_digests -= not_supported
+    deprecated = allowed_digests & DEPRECATED_DIGESTS
+    if deprecated and logger:
+        if not conf_digests:
+            logger.warning('The following digest algorithms are allowed by '
+                           'default but deprecated: %s. Support will be '
+                           'disabled by default in a future release, and '
+                           'later removed entirely.', ', '.join(deprecated))
+        else:
+            logger.warning('The following digest algorithms are configured '
+                           'but deprecated: %s. Support will be removed in a '
+                           'future release.', ', '.join(deprecated))
+    if not allowed_digests:
+        raise ValueError('No valid digest algorithms are configured')
+
+    return allowed_digests, deprecated
+
+
+def extract_digest_and_algorithm(value):
+    """
+    Returns a tuple of (digest_algorithm, hex_encoded_digest)
+    from a client-provided string of the form::
+
+       <hex-encoded digest>
+
+    or::
+
+       <algorithm>:<base64-encoded digest>
+
+    Note that hex-encoded strings must use one of sha1, sha256, or sha512.
+
+    :raises: ValueError on parse failures
+    """
+    if ':' in value:
+        algo, value = value.split(':', 1)
+        # accept both standard and url-safe base64
+        if ('-' in value or '_' in value) and not (
+                '+' in value or '/' in value):
+            value = value.replace('-', '+').replace('_', '/')
+        value = binascii.hexlify(strict_b64decode(value + '=='))
+        if not six.PY2:
+            value = value.decode('ascii')
+    else:
+        try:
+            binascii.unhexlify(value)  # make sure it decodes
+        except TypeError:
+            # This is just for py2
+            raise ValueError('Non-hexadecimal digit found')
+        algo = {
+            40: 'sha1',
+            64: 'sha256',
+            128: 'sha512',
+        }.get(len(value))
+        if not algo:
+            raise ValueError('Bad digest length')
+    return algo, value
diff --git a/swift/common/middleware/formpost.py b/swift/common/middleware/formpost.py
index 57ba41d5c2..b3dde1832a 100644
--- a/swift/common/middleware/formpost.py
+++ b/swift/common/middleware/formpost.py
@@ -131,11 +131,12 @@ from six.moves.urllib.parse import quote
 
 from swift.common.constraints import valid_api_version
 from swift.common.exceptions import MimeInvalid
-from swift.common.middleware.tempurl import get_tempurl_keys_from_metadata, \
-    SUPPORTED_DIGESTS
+from swift.common.middleware.tempurl import get_tempurl_keys_from_metadata
+from swift.common.digest import get_allowed_digests, \
+    extract_digest_and_algorithm, DEFAULT_ALLOWED_DIGESTS
 from swift.common.utils import streq_const_time, parse_content_disposition, \
     parse_mime_headers, iter_multipart_mime_documents, reiterate, \
-    close_if_possible, get_logger, extract_digest_and_algorithm
+    close_if_possible, get_logger
 from swift.common.registry import register_swift_info
 from swift.common.wsgi import make_pre_authed_env
 from swift.common.swob import HTTPUnauthorized, wsgi_to_str, str_to_wsgi
@@ -216,7 +217,7 @@ class FormPost(object):
         # deprecate sha1 yet. We'll change this to DEFAULT_ALLOWED_DIGESTS
         # later.
         self.allowed_digests = conf.get(
-            'allowed_digests', SUPPORTED_DIGESTS)
+            'allowed_digests', DEFAULT_ALLOWED_DIGESTS.split())
 
     def __call__(self, env, start_response):
         """
@@ -484,17 +485,11 @@ def filter_factory(global_conf, **local_conf):
     conf.update(local_conf)
 
     logger = get_logger(conf, log_route='formpost')
-    allowed_digests = set(conf.get('allowed_digests', '').split()) or \
-        SUPPORTED_DIGESTS
-    not_supported = allowed_digests - SUPPORTED_DIGESTS
-    if not_supported:
-        logger.warning('The following digest algorithms are configured but '
-                       'not supported: %s', ', '.join(not_supported))
-        allowed_digests -= not_supported
-    if not allowed_digests:
-        raise ValueError('No valid digest algorithms are configured '
-                         'for formpost')
+    allowed_digests, deprecated_digests = get_allowed_digests(
+        conf.get('allowed_digests', '').split(), logger)
     info = {'allowed_digests': sorted(allowed_digests)}
+    if deprecated_digests:
+        info['deprecated_digests'] = sorted(deprecated_digests)
     register_swift_info('formpost', **info)
     conf.update(info)
     return lambda app: FormPost(app, conf)
diff --git a/swift/common/middleware/tempurl.py b/swift/common/middleware/tempurl.py
index 5b0d10ed64..ffb900d78c 100644
--- a/swift/common/middleware/tempurl.py
+++ b/swift/common/middleware/tempurl.py
@@ -309,10 +309,12 @@ from six.moves.urllib.parse import urlencode
 
 from swift.proxy.controllers.base import get_account_info, get_container_info
 from swift.common.header_key_dict import HeaderKeyDict
+from swift.common.digest import get_allowed_digests, \
+    extract_digest_and_algorithm, DEFAULT_ALLOWED_DIGESTS, get_hmac
 from swift.common.swob import header_to_environ_key, HTTPUnauthorized, \
     HTTPBadRequest, wsgi_to_str
 from swift.common.utils import split_path, get_valid_utf8_str, \
-    get_hmac, streq_const_time, quote, get_logger, extract_digest_and_algorithm
+    streq_const_time, quote, get_logger
 from swift.common.registry import register_swift_info, register_sensitive_param
 
 
@@ -340,10 +342,6 @@ DEFAULT_OUTGOING_REMOVE_HEADERS = 'x-object-meta-*'
 #: '*' to indicate a prefix match.
 DEFAULT_OUTGOING_ALLOW_HEADERS = 'x-object-meta-public-*'
 
-DEFAULT_ALLOWED_DIGESTS = 'sha1 sha256 sha512'
-DEPRECATED_DIGESTS = {'sha1'}
-SUPPORTED_DIGESTS = set(DEFAULT_ALLOWED_DIGESTS.split()) | DEPRECATED_DIGESTS
-
 CONTAINER_SCOPE = 'container'
 ACCOUNT_SCOPE = 'account'
 
@@ -841,34 +839,14 @@ def filter_factory(global_conf, **local_conf):
         'incoming_allow_headers': DEFAULT_INCOMING_ALLOW_HEADERS,
         'outgoing_remove_headers': DEFAULT_OUTGOING_REMOVE_HEADERS,
         'outgoing_allow_headers': DEFAULT_OUTGOING_ALLOW_HEADERS,
-        'allowed_digests': DEFAULT_ALLOWED_DIGESTS,
     }
     info_conf = {k: conf.get(k, v).split() for k, v in defaults.items()}
 
-    allowed_digests = set(digest.lower()
-                          for digest in info_conf['allowed_digests'])
-    not_supported = allowed_digests - SUPPORTED_DIGESTS
-    if not_supported:
-        logger.warning('The following digest algorithms are configured but '
-                       'not supported: %s', ', '.join(not_supported))
-        allowed_digests -= not_supported
-
-    deprecated = allowed_digests & DEPRECATED_DIGESTS
-    if deprecated:
-        if not conf.get('allowed_digests'):
-            logger.warning('The following digest algorithms are allowed by '
-                           'default but deprecated: %s. Support will be '
-                           'disabled by default in a future release, and '
-                           'later removed entirely.', ', '.join(deprecated))
-        else:
-            logger.warning('The following digest algorithms are configured '
-                           'but deprecated: %s. Support will be removed in a '
-                           'future release.', ', '.join(deprecated))
-
-    if not allowed_digests:
-        raise ValueError('No valid digest algorithms are configured '
-                         'for tempurls')
+    allowed_digests, deprecated_digests = get_allowed_digests(
+        conf.get('allowed_digests', '').split(), logger)
     info_conf['allowed_digests'] = sorted(allowed_digests)
+    if deprecated_digests:
+        info_conf['deprecated_digests'] = sorted(deprecated_digests)
 
     register_swift_info('tempurl', **info_conf)
     conf.update(info_conf)
diff --git a/swift/common/utils.py b/swift/common/utils.py
index 25505d8ffe..ab6615a4c6 100644
--- a/swift/common/utils.py
+++ b/swift/common/utils.py
@@ -25,7 +25,6 @@ import errno
 import fcntl
 import grp
 import hashlib
-import hmac
 import json
 import math
 import operator
@@ -282,90 +281,6 @@ except (InvalidHashPathConfigError, IOError):
     pass
 
 
-def extract_digest_and_algorithm(value):
-    """
-    Returns a tuple of (digest_algorithm, hex_encoded_digest)
-    from a client-provided string of the form::
-
-       <hex-encoded digest>
-
-    or::
-
-       <algorithm>:<base64-encoded digest>
-
-    Note that hex-encoded strings must use one of sha1, sha256, or sha512.
-
-    :raises: ValueError on parse failures
-    """
-    if ':' in value:
-        algo, value = value.split(':', 1)
-        # accept both standard and url-safe base64
-        if ('-' in value or '_' in value) and not (
-                '+' in value or '/' in value):
-            value = value.replace('-', '+').replace('_', '/')
-        value = binascii.hexlify(strict_b64decode(value + '=='))
-        if not six.PY2:
-            value = value.decode('ascii')
-    else:
-        try:
-            binascii.unhexlify(value)  # make sure it decodes
-        except TypeError:
-            # This is just for py2
-            raise ValueError('Non-hexadecimal digit found')
-        algo = {
-            40: 'sha1',
-            64: 'sha256',
-            128: 'sha512',
-        }.get(len(value))
-        if not algo:
-            raise ValueError('Bad digest length')
-    return algo, value
-
-
-def get_hmac(request_method, path, expires, key, digest="sha1",
-             ip_range=None):
-    """
-    Returns the hexdigest string of the HMAC (see RFC 2104) for
-    the request.
-
-    :param request_method: Request method to allow.
-    :param path: The path to the resource to allow access to.
-    :param expires: Unix timestamp as an int for when the URL
-                    expires.
-    :param key: HMAC shared secret.
-    :param digest: constructor or the string name for the digest to use in
-                   calculating the HMAC
-                   Defaults to SHA1
-    :param ip_range: The ip range from which the resource is allowed
-                     to be accessed. We need to put the ip_range as the
-                     first argument to hmac to avoid manipulation of the path
-                     due to newlines being valid in paths
-                     e.g. /v1/a/c/o\\n127.0.0.1
-    :returns: hexdigest str of the HMAC for the request using the specified
-              digest algorithm.
-    """
-    # These are the three mandatory fields.
-    parts = [request_method, str(expires), path]
-    formats = [b"%s", b"%s", b"%s"]
-
-    if ip_range:
-        parts.insert(0, ip_range)
-        formats.insert(0, b"ip=%s")
-
-    if not isinstance(key, six.binary_type):
-        key = key.encode('utf8')
-
-    message = b'\n'.join(
-        fmt % (part if isinstance(part, six.binary_type)
-               else part.encode("utf-8"))
-        for fmt, part in zip(formats, parts))
-
-    if six.PY2 and isinstance(digest, six.string_types):
-        digest = getattr(hashlib, digest)
-
-    return hmac.new(key, message, digest).hexdigest()
-
-
 def backward(f, blocksize=4096):
     """
     A generator returning lines from a file starting with the last line,
diff --git a/swift/proxy/controllers/info.py b/swift/proxy/controllers/info.py
index 05bc1a998b..2435849c78 100644
--- a/swift/proxy/controllers/info.py
+++ b/swift/proxy/controllers/info.py
@@ -16,7 +16,8 @@
 import json
 from time import time
 
-from swift.common.utils import public, get_hmac, streq_const_time
+from swift.common.utils import public, streq_const_time
+from swift.common.digest import get_hmac
 from swift.common.registry import get_swift_info
 from swift.proxy.controllers.base import Controller, delay_denial
 from swift.common.swob import HTTPOk, HTTPForbidden, HTTPUnauthorized
diff --git a/test/unit/common/middleware/test_formpost.py b/test/unit/common/middleware/test_formpost.py
index 455997d226..d751062e88 100644
--- a/test/unit/common/middleware/test_formpost.py
+++ b/test/unit/common/middleware/test_formpost.py
@@ -28,8 +28,9 @@ from io import BytesIO
 
 from swift.common.swob import Request, Response, wsgi_quote
 from swift.common.middleware import tempauth, formpost
+from swift.common.middleware.tempurl import DEFAULT_ALLOWED_DIGESTS
 from swift.common.utils import split_path
-from swift.common import registry
+from swift.common import registry, digest as digest_utils
 from swift.proxy.controllers.base import get_cache_key
 from test.debug_logger import debug_logger
 
@@ -1656,8 +1657,11 @@ class TestFormPost(unittest.TestCase):
         self.assertIsNone(exc_info)
         self.assertTrue(b'FormPost: invalid starting boundary' in body)
 
-    def test_redirect_allowed_and_unsupported_digests(self):
+    def test_redirect_allowed_deprecated_and_unsupported_digests(self):
+        logger = debug_logger()
+
         def do_test(digest):
+            logger.clear()
             key = b'abc'
             sig, env, body = self._make_sig_env_body(
                 '/v1/AUTH_test/container', 'http://redirect', 1024, 10,
@@ -1670,7 +1674,11 @@ class TestFormPost(unittest.TestCase):
             self.app = FakeApp(iter([('201 Created', {}, b''),
                                      ('201 Created', {}, b'')]))
             self.auth = tempauth.filter_factory({})(self.app)
-            self.formpost = formpost.filter_factory({})(self.auth)
+            with mock.patch('swift.common.middleware.formpost.get_logger',
+                            return_value=logger):
+                self.formpost = formpost.filter_factory(
+                    {
+                        'allowed_digests': DEFAULT_ALLOWED_DIGESTS})(self.auth)
             status = [None]
             headers = [None]
             exc_info = [None]
@@ -1696,6 +1704,12 @@ class TestFormPost(unittest.TestCase):
             self.assertEqual(len(self.app.requests), 2)
             self.assertEqual(self.app.requests[0].body, b'Test File\nOne\n')
             self.assertEqual(self.app.requests[1].body, b'Test\nFile\nTwo\n')
+            if algorithm in digest_utils.DEPRECATED_DIGESTS:
+                self.assertIn(
+                    'The following digest algorithms are configured but '
+                    'deprecated: %s. Support will be removed in a '
+                    'future release.' % algorithm,
+                    logger.get_lines_for_level('warning'))
 
         # unsupported
         _body, status, _headers, _exc_info = do_test("md5")
@@ -2252,7 +2266,9 @@ class TestSwiftInfo(unittest.TestCase):
         self.assertIn('formpost', swift_info)
         info = swift_info['formpost']
         self.assertIn('allowed_digests', info)
+        self.assertIn('deprecated_digests', info)
         self.assertEqual(info['allowed_digests'], ['sha1', 'sha256', 'sha512'])
+        self.assertEqual(info['deprecated_digests'], ['sha1'])
 
     def test_non_default_methods(self):
         logger = debug_logger()
@@ -2265,7 +2281,9 @@ class TestSwiftInfo(unittest.TestCase):
         self.assertIn('formpost', swift_info)
         info = swift_info['formpost']
         self.assertIn('allowed_digests', info)
+        self.assertIn('deprecated_digests', info)
         self.assertEqual(info['allowed_digests'], ['sha1', 'sha512'])
+        self.assertEqual(info['deprecated_digests'], ['sha1'])
         warning_lines = logger.get_lines_for_level('warning')
         self.assertIn(
             'The following digest algorithms are configured '
@@ -2274,6 +2292,15 @@ class TestSwiftInfo(unittest.TestCase):
         self.assertIn('not-a-valid-digest', warning_lines[0])
         self.assertIn('md5', warning_lines[0])
 
+    def test_no_deprecated_digests(self):
+        formpost.filter_factory({'allowed_digests': 'sha256 sha512'})
+        swift_info = registry.get_swift_info()
+        self.assertIn('formpost', swift_info)
+        info = swift_info['formpost']
+        self.assertIn('allowed_digests', info)
+        self.assertNotIn('deprecated_digests', info)
+        self.assertEqual(info['allowed_digests'], ['sha256', 'sha512'])
+
     def test_bad_config(self):
         with self.assertRaises(ValueError):
             formpost.filter_factory({
diff --git a/test/unit/common/middleware/test_tempurl.py b/test/unit/common/middleware/test_tempurl.py
index 7e984ca274..ba970c2d5b 100644
--- a/test/unit/common/middleware/test_tempurl.py
+++ b/test/unit/common/middleware/test_tempurl.py
@@ -1625,6 +1625,7 @@ class TestSwiftInfo(unittest.TestCase):
         self.assertEqual(set(info['outgoing_allow_headers']),
                          set(('x-object-meta-public-*',)))
         self.assertEqual(info['allowed_digests'], ['sha1', 'sha256', 'sha512'])
+        self.assertEqual(info['deprecated_digests'], ['sha1'])
 
     def test_non_default_methods(self):
         tempurl.filter_factory({
@@ -1647,6 +1648,24 @@ class TestSwiftInfo(unittest.TestCase):
         self.assertEqual(set(info['outgoing_allow_headers']),
                          set(('x-object-meta-*', 'content-type')))
         self.assertEqual(info['allowed_digests'], ['sha1', 'sha512'])
+        self.assertEqual(info['deprecated_digests'], ['sha1'])
+
+    def test_no_deprecated_digests(self):
+        tempurl.filter_factory({'allowed_digests': 'sha256 sha512'})
+        swift_info = registry.get_swift_info()
+        self.assertIn('tempurl', swift_info)
+        info = swift_info['tempurl']
+        self.assertEqual(set(info['methods']),
+                         set(('GET', 'HEAD', 'PUT', 'POST', 'DELETE')))
+        self.assertEqual(set(info['incoming_remove_headers']),
+                         set(('x-timestamp',)))
+        self.assertEqual(set(info['incoming_allow_headers']), set())
+        self.assertEqual(set(info['outgoing_remove_headers']),
+                         set(('x-object-meta-*',)))
+        self.assertEqual(set(info['outgoing_allow_headers']),
+                         set(('x-object-meta-public-*',)))
+        self.assertEqual(info['allowed_digests'], ['sha256', 'sha512'])
+        self.assertNotIn('deprecated_digests', info)
 
     def test_bad_config(self):
         with self.assertRaises(ValueError):
diff --git a/test/unit/common/test_digest.py b/test/unit/common/test_digest.py
new file mode 100644
index 0000000000..d2105169f8
--- /dev/null
+++ b/test/unit/common/test_digest.py
@@ -0,0 +1,191 @@
+# Copyright (c) 2022 NVIDIA
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import hashlib
+import unittest
+
+from swift.common import digest
+from test.debug_logger import debug_logger
+
+
+class TestDigestUtils(unittest.TestCase):
+    """Tests for swift.common.middleware.digest """
+    def setUp(self):
+        self.logger = debug_logger('test_digest_utils')
+
+    def test_get_hmac(self):
+        self.assertEqual(
+            digest.get_hmac('GET', '/path', 1, 'abc'),
+            'b17f6ff8da0e251737aa9e3ee69a881e3e092e2f')
+
+    def test_get_hmac_ip_range(self):
+        self.assertEqual(
+            digest.get_hmac('GET', '/path', 1, 'abc', ip_range='127.0.0.1'),
+            'b30dde4d2b8562b8496466c3b46b2b9ac5054461')
+
+    def test_get_hmac_ip_range_non_binary_type(self):
+        self.assertEqual(
+            digest.get_hmac(
+                u'GET', u'/path', 1, u'abc', ip_range=u'127.0.0.1'),
+            'b30dde4d2b8562b8496466c3b46b2b9ac5054461')
+
+    def test_get_hmac_digest(self):
+        self.assertEqual(
+            digest.get_hmac(u'GET', u'/path', 1, u'abc', digest='sha256'),
+            '64c5558394f86b042ce1e929b34907abd9d0a57f3e20cd3f93cffd83de0206a7')
+        self.assertEqual(
+            digest.get_hmac(
+                u'GET', u'/path', 1, u'abc', digest=hashlib.sha256),
+            '64c5558394f86b042ce1e929b34907abd9d0a57f3e20cd3f93cffd83de0206a7')
+
+        self.assertEqual(
+            digest.get_hmac(u'GET', u'/path', 1, u'abc', digest='sha512'),
+            '7e95af818aec1b69b53fc2cb6d69456ec64ebda6c17b8fc8b7303b78acc8ca'
+            '14fc4aed96c1614a8e9d6ff45a6237711d8be294cda679624825d79aa6959b'
+            '5229')
+        self.assertEqual(
+            digest.get_hmac(
+                u'GET', u'/path', 1, u'abc', digest=hashlib.sha512),
+            '7e95af818aec1b69b53fc2cb6d69456ec64ebda6c17b8fc8b7303b78acc8ca'
+            '14fc4aed96c1614a8e9d6ff45a6237711d8be294cda679624825d79aa6959b'
+            '5229')
+
+    def test_extract_digest_and_algorithm(self):
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'b17f6ff8da0e251737aa9e3ee69a881e3e092e2f'),
+            ('sha1', 'b17f6ff8da0e251737aa9e3ee69a881e3e092e2f'))
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'sha1:sw3eTSuFYrhJZGbDtGsrmsUFRGE='),
+            ('sha1', 'b30dde4d2b8562b8496466c3b46b2b9ac5054461'))
+        # also good with '=' stripped
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'sha1:sw3eTSuFYrhJZGbDtGsrmsUFRGE'),
+            ('sha1', 'b30dde4d2b8562b8496466c3b46b2b9ac5054461'))
+
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'b963712313cd4236696fb4c4cf11fc56'
+                'ff4158e0bcbf1d4424df147783fd1045'),
+            ('sha256', 'b963712313cd4236696fb4c4cf11fc56'
+                       'ff4158e0bcbf1d4424df147783fd1045'))
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'sha256:uWNxIxPNQjZpb7TEzxH8Vv9BWOC8vx1EJN8Ud4P9EEU='),
+            ('sha256', 'b963712313cd4236696fb4c4cf11fc56'
+                       'ff4158e0bcbf1d4424df147783fd1045'))
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'sha256:uWNxIxPNQjZpb7TEzxH8Vv9BWOC8vx1EJN8Ud4P9EEU'),
+            ('sha256', 'b963712313cd4236696fb4c4cf11fc56'
+                       'ff4158e0bcbf1d4424df147783fd1045'))
+
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                '26df3d9d59da574d6f8d359cb2620b1b'
+                '86737215c38c412dfee0a410acea1ac4'
+                '285ad0c37229ca74e715c443979da17d'
+                '3d77a97d2ac79cc5e395b05bfa4bdd30'),
+            ('sha512', '26df3d9d59da574d6f8d359cb2620b1b'
+                       '86737215c38c412dfee0a410acea1ac4'
+                       '285ad0c37229ca74e715c443979da17d'
+                       '3d77a97d2ac79cc5e395b05bfa4bdd30'))
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'sha512:Jt89nVnaV01vjTWcsmILG4ZzchXDjEEt/uCkEKzq'
+                'GsQoWtDDcinKdOcVxEOXnaF9PXepfSrHnMXjlbBb+kvdMA=='),
+            ('sha512', '26df3d9d59da574d6f8d359cb2620b1b'
+                       '86737215c38c412dfee0a410acea1ac4'
+                       '285ad0c37229ca74e715c443979da17d'
+                       '3d77a97d2ac79cc5e395b05bfa4bdd30'))
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'sha512:Jt89nVnaV01vjTWcsmILG4ZzchXDjEEt_uCkEKzq'
+                'GsQoWtDDcinKdOcVxEOXnaF9PXepfSrHnMXjlbBb-kvdMA'),
+            ('sha512', '26df3d9d59da574d6f8d359cb2620b1b'
+                       '86737215c38c412dfee0a410acea1ac4'
+                       '285ad0c37229ca74e715c443979da17d'
+                       '3d77a97d2ac79cc5e395b05bfa4bdd30'))
+
+        with self.assertRaises(ValueError):
+            digest.extract_digest_and_algorithm('')
+        with self.assertRaises(ValueError):
+            digest.extract_digest_and_algorithm(
+                'exactly_forty_chars_but_not_hex_encoded!')
+        # Too short (md5)
+        with self.assertRaises(ValueError):
+            digest.extract_digest_and_algorithm(
+                'd41d8cd98f00b204e9800998ecf8427e')
+        # but you can slip it in via the prefix notation!
+        self.assertEqual(
+            digest.extract_digest_and_algorithm(
+                'md5:1B2M2Y8AsgTpgAmY7PhCfg'),
+            ('md5', 'd41d8cd98f00b204e9800998ecf8427e'))
+
+    def test_get_allowed_digests(self):
+        # start with defaults
+        allowed, deprecated = digest.get_allowed_digests(
+            ''.split(), self.logger)
+        self.assertEqual(allowed, {'sha256', 'sha512', 'sha1'})
+        self.assertEqual(deprecated, {'sha1'})
+        warning_lines = self.logger.get_lines_for_level('warning')
+        expected_warning_line = (
+            'The following digest algorithms are allowed by default but '
+            'deprecated: sha1. Support will be disabled by default in a '
+            'future release, and later removed entirely.')
+        self.assertIn(expected_warning_line, warning_lines)
+        self.logger.clear()
+
+        # now with a subset
+        allowed, deprecated = digest.get_allowed_digests(
+            'sha1 sha256'.split(), self.logger)
+        self.assertEqual(allowed, {'sha256', 'sha1'})
+        self.assertEqual(deprecated, {'sha1'})
+        warning_lines = self.logger.get_lines_for_level('warning')
+        expected_warning_line = (
+            'The following digest algorithms are configured but '
+            'deprecated: sha1. Support will be removed in a future release.')
+        self.assertIn(expected_warning_line, warning_lines)
+        self.logger.clear()
+
+        # Now also with an unsupported digest
+        allowed, deprecated = digest.get_allowed_digests(
+            'sha1 sha256 md5'.split(), self.logger)
+        self.assertEqual(allowed, {'sha256', 'sha1'})
+        self.assertEqual(deprecated, {'sha1'})
+        warning_lines = self.logger.get_lines_for_level('warning')
+        self.assertIn(expected_warning_line, warning_lines)
+        expected_unsupported_warning_line = (
+            'The following digest algorithms are configured but not '
+            'supported: md5')
+        self.assertIn(expected_unsupported_warning_line, warning_lines)
+        self.logger.clear()
+
+        # Now with no deprecated digests
+        allowed, deprecated = digest.get_allowed_digests(
+            'sha256 sha512'.split(), self.logger)
+        self.assertEqual(allowed, {'sha256', 'sha512'})
+        self.assertEqual(deprecated, set())
+        warning_lines = self.logger.get_lines_for_level('warning')
+        self.assertFalse(warning_lines)
+        self.logger.clear()
+
+        # no valid digest
+        # Now also with an unsupported digest
+        with self.assertRaises(ValueError):
+            digest.get_allowed_digests(['md5'], self.logger)
+        warning_lines = self.logger.get_lines_for_level('warning')
+        self.assertIn(expected_unsupported_warning_line, warning_lines)
diff --git a/test/unit/common/test_utils.py b/test/unit/common/test_utils.py
index 6c107d92b7..b710979306 100644
--- a/test/unit/common/test_utils.py
+++ b/test/unit/common/test_utils.py
@@ -3836,113 +3836,6 @@ cluster_dfw1 = http://dfw1.host/v1/
         self.assertEqual(u'abc_%EC%9D%BC%EC%98%81',
                          utils.quote(u'abc_\uc77c\uc601'))
 
-    def test_extract_digest_and_algorithm(self):
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'b17f6ff8da0e251737aa9e3ee69a881e3e092e2f'),
-            ('sha1', 'b17f6ff8da0e251737aa9e3ee69a881e3e092e2f'))
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'sha1:sw3eTSuFYrhJZGbDtGsrmsUFRGE='),
-            ('sha1', 'b30dde4d2b8562b8496466c3b46b2b9ac5054461'))
-        # also good with '=' stripped
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'sha1:sw3eTSuFYrhJZGbDtGsrmsUFRGE'),
-            ('sha1', 'b30dde4d2b8562b8496466c3b46b2b9ac5054461'))
-
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'b963712313cd4236696fb4c4cf11fc56'
-                'ff4158e0bcbf1d4424df147783fd1045'),
-            ('sha256', 'b963712313cd4236696fb4c4cf11fc56'
-                       'ff4158e0bcbf1d4424df147783fd1045'))
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'sha256:uWNxIxPNQjZpb7TEzxH8Vv9BWOC8vx1EJN8Ud4P9EEU='),
-            ('sha256', 'b963712313cd4236696fb4c4cf11fc56'
-                       'ff4158e0bcbf1d4424df147783fd1045'))
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'sha256:uWNxIxPNQjZpb7TEzxH8Vv9BWOC8vx1EJN8Ud4P9EEU'),
-            ('sha256', 'b963712313cd4236696fb4c4cf11fc56'
-                       'ff4158e0bcbf1d4424df147783fd1045'))
-
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                '26df3d9d59da574d6f8d359cb2620b1b'
-                '86737215c38c412dfee0a410acea1ac4'
-                '285ad0c37229ca74e715c443979da17d'
-                '3d77a97d2ac79cc5e395b05bfa4bdd30'),
-            ('sha512', '26df3d9d59da574d6f8d359cb2620b1b'
-                       '86737215c38c412dfee0a410acea1ac4'
-                       '285ad0c37229ca74e715c443979da17d'
-                       '3d77a97d2ac79cc5e395b05bfa4bdd30'))
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'sha512:Jt89nVnaV01vjTWcsmILG4ZzchXDjEEt/uCkEKzq'
-                'GsQoWtDDcinKdOcVxEOXnaF9PXepfSrHnMXjlbBb+kvdMA=='),
-            ('sha512', '26df3d9d59da574d6f8d359cb2620b1b'
-                       '86737215c38c412dfee0a410acea1ac4'
-                       '285ad0c37229ca74e715c443979da17d'
-                       '3d77a97d2ac79cc5e395b05bfa4bdd30'))
-        self.assertEqual(
-            utils.extract_digest_and_algorithm(
-                'sha512:Jt89nVnaV01vjTWcsmILG4ZzchXDjEEt_uCkEKzq'
-                'GsQoWtDDcinKdOcVxEOXnaF9PXepfSrHnMXjlbBb-kvdMA'),
-            ('sha512', '26df3d9d59da574d6f8d359cb2620b1b'
-                       '86737215c38c412dfee0a410acea1ac4'
-                       '285ad0c37229ca74e715c443979da17d'
-                       '3d77a97d2ac79cc5e395b05bfa4bdd30'))
-
-        with self.assertRaises(ValueError):
-            utils.extract_digest_and_algorithm('')
-        with self.assertRaises(ValueError):
-            utils.extract_digest_and_algorithm(
-                'exactly_forty_chars_but_not_hex_encoded!')
-        # Too short (md5)
-        with self.assertRaises(ValueError):
-            utils.extract_digest_and_algorithm(
-                'd41d8cd98f00b204e9800998ecf8427e')
-        # but you can slip it in via the prefix notation!
-        self.assertEqual(
-            utils.extract_digest_and_algorithm('md5:1B2M2Y8AsgTpgAmY7PhCfg'),
-            ('md5', 'd41d8cd98f00b204e9800998ecf8427e'))
-
-    def test_get_hmac(self):
-        self.assertEqual(
-            utils.get_hmac('GET', '/path', 1, 'abc'),
-            'b17f6ff8da0e251737aa9e3ee69a881e3e092e2f')
-
-    def test_get_hmac_ip_range(self):
-        self.assertEqual(
-            utils.get_hmac('GET', '/path', 1, 'abc', ip_range='127.0.0.1'),
-            'b30dde4d2b8562b8496466c3b46b2b9ac5054461')
-
-    def test_get_hmac_ip_range_non_binary_type(self):
-        self.assertEqual(
-            utils.get_hmac(u'GET', u'/path', 1, u'abc', ip_range=u'127.0.0.1'),
-            'b30dde4d2b8562b8496466c3b46b2b9ac5054461')
-
-    def test_get_hmac_digest(self):
-        self.assertEqual(
-            utils.get_hmac(u'GET', u'/path', 1, u'abc', digest='sha256'),
-            '64c5558394f86b042ce1e929b34907abd9d0a57f3e20cd3f93cffd83de0206a7')
-        self.assertEqual(
-            utils.get_hmac(u'GET', u'/path', 1, u'abc', digest=hashlib.sha256),
-            '64c5558394f86b042ce1e929b34907abd9d0a57f3e20cd3f93cffd83de0206a7')
-
-        self.assertEqual(
-            utils.get_hmac(u'GET', u'/path', 1, u'abc', digest='sha512'),
-            '7e95af818aec1b69b53fc2cb6d69456ec64ebda6c17b8fc8b7303b78acc8ca'
-            '14fc4aed96c1614a8e9d6ff45a6237711d8be294cda679624825d79aa6959b'
-            '5229')
-        self.assertEqual(
-            utils.get_hmac(u'GET', u'/path', 1, u'abc', digest=hashlib.sha512),
-            '7e95af818aec1b69b53fc2cb6d69456ec64ebda6c17b8fc8b7303b78acc8ca'
-            '14fc4aed96c1614a8e9d6ff45a6237711d8be294cda679624825d79aa6959b'
-            '5229')
-
     def test_parse_override_options(self):
         # When override_<thing> is passed in, it takes precedence.
         opts = utils.parse_override_options(
diff --git a/test/unit/proxy/controllers/test_info.py b/test/unit/proxy/controllers/test_info.py
index 560d4d660a..5ddd76f3d9 100644
--- a/test/unit/proxy/controllers/test_info.py
+++ b/test/unit/proxy/controllers/test_info.py
@@ -20,7 +20,7 @@ from mock import Mock
 
 from swift.proxy.controllers import InfoController
 from swift.proxy.server import Application as ProxyApp
-from swift.common import utils, registry
+from swift.common import registry, digest
 from swift.common.swob import Request, HTTPException
 from test.debug_logger import debug_logger
 
@@ -133,7 +133,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('GET', '/info', expires, '')
+        sig = digest.get_hmac('GET', '/info', expires, '')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -149,7 +149,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('GET', '/info', expires, 'secret-admin-key')
+        sig = digest.get_hmac('GET', '/info', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -170,7 +170,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('GET', '/info', expires, 'secret-admin-key')
+        sig = digest.get_hmac('GET', '/info', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -180,7 +180,7 @@ class TestInfoController(unittest.TestCase):
         self.assertEqual('200 OK', str(resp))
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('HEAD', '/info', expires, 'secret-admin-key')
+        sig = digest.get_hmac('HEAD', '/info', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -196,7 +196,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('HEAD', '/info', expires, 'secret-admin-key')
+        sig = digest.get_hmac('HEAD', '/info', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -212,7 +212,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = 1
-        sig = utils.get_hmac('GET', '/info', expires, 'secret-admin-key')
+        sig = digest.get_hmac('GET', '/info', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -222,7 +222,7 @@ class TestInfoController(unittest.TestCase):
         self.assertEqual('401 Unauthorized', str(resp))
 
         expires = 'abc'
-        sig = utils.get_hmac('GET', '/info', expires, 'secret-admin-key')
+        sig = digest.get_hmac('GET', '/info', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -238,7 +238,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('GET', '/foo', expires, 'secret-admin-key')
+        sig = digest.get_hmac('GET', '/foo', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -254,7 +254,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('GET', '/foo', expires, 'invalid-admin-key')
+        sig = digest.get_hmac('GET', '/foo', expires, 'invalid-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(
@@ -272,7 +272,7 @@ class TestInfoController(unittest.TestCase):
         registry._swift_admin_info = {'qux': {'quux': 'corge'}}
 
         expires = int(time.time() + 86400)
-        sig = utils.get_hmac('GET', '/info', expires, 'secret-admin-key')
+        sig = digest.get_hmac('GET', '/info', expires, 'secret-admin-key')
         path = '/info?swiftinfo_sig={sig}&swiftinfo_expires={expires}'.format(
             sig=sig, expires=expires)
         req = Request.blank(