diff --git a/synapse/handlers/acme_issuing_service.py b/synapse/handlers/acme_issuing_service.py
deleted file mode 100644
index a972d3fa0a..0000000000
--- a/synapse/handlers/acme_issuing_service.py
+++ /dev/null
@@ -1,127 +0,0 @@
-# Copyright 2019 New Vector Ltd
-# Copyright 2019 The Matrix.org Foundation C.I.C.
-#
-# 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.
-
-"""
-Utility function to create an ACME issuing service.
-
-This file contains the unconditional imports on the acme and cryptography bits that we
-only need (and may only have available) if we are doing ACME, so is designed to be
-imported conditionally.
-"""
-import logging
-from typing import Dict, Iterable, List
-
-import attr
-import pem
-from cryptography.hazmat.backends import default_backend
-from cryptography.hazmat.primitives import serialization
-from josepy import JWKRSA
-from josepy.jwa import RS256
-from txacme.challenges import HTTP01Responder
-from txacme.client import Client
-from txacme.interfaces import ICertificateStore
-from txacme.service import AcmeIssuingService
-from txacme.util import generate_private_key
-from zope.interface import implementer
-
-from twisted.internet import defer
-from twisted.internet.interfaces import IReactorTCP
-from twisted.python.filepath import FilePath
-from twisted.python.url import URL
-from twisted.web.resource import IResource
-
-logger = logging.getLogger(__name__)
-
-
-def create_issuing_service(
- reactor: IReactorTCP,
- acme_url: str,
- account_key_file: str,
- well_known_resource: IResource,
-) -> AcmeIssuingService:
- """Create an ACME issuing service, and attach it to a web Resource
-
- Args:
- reactor: twisted reactor
- acme_url: URL to use to request certificates
- account_key_file: where to store the account key
- well_known_resource: web resource for .well-known.
- we will attach a child resource for "acme-challenge".
-
- Returns:
- AcmeIssuingService
- """
- responder = HTTP01Responder()
-
- well_known_resource.putChild(b"acme-challenge", responder.resource)
-
- store = ErsatzStore()
-
- return AcmeIssuingService(
- cert_store=store,
- client_creator=(
- lambda: Client.from_url(
- reactor=reactor,
- url=URL.from_text(acme_url),
- key=load_or_create_client_key(account_key_file),
- alg=RS256,
- )
- ),
- clock=reactor,
- responders=[responder],
- )
-
-
-@attr.s(slots=True)
-@implementer(ICertificateStore)
-class ErsatzStore:
- """
- A store that only stores in memory.
- """
-
- certs = attr.ib(type=Dict[bytes, List[bytes]], default=attr.Factory(dict))
-
- def store(
- self, server_name: bytes, pem_objects: Iterable[pem.AbstractPEMObject]
- ) -> defer.Deferred:
- self.certs[server_name] = [o.as_bytes() for o in pem_objects]
- return defer.succeed(None)
-
-
-def load_or_create_client_key(key_file: str) -> JWKRSA:
- """Load the ACME account key from a file, creating it if it does not exist.
-
- Args:
- key_file: name of the file to use as the account key
- """
- # this is based on txacme.endpoint.load_or_create_client_key, but doesn't
- # hardcode the 'client.key' filename
- acme_key_file = FilePath(key_file)
- if acme_key_file.exists():
- logger.info("Loading ACME account key from '%s'", acme_key_file)
- key = serialization.load_pem_private_key(
- acme_key_file.getContent(), password=None, backend=default_backend()
- )
- else:
- logger.info("Saving new ACME account key to '%s'", acme_key_file)
- key = generate_private_key("rsa")
- acme_key_file.setContent(
- key.private_bytes(
- encoding=serialization.Encoding.PEM,
- format=serialization.PrivateFormat.TraditionalOpenSSL,
- encryption_algorithm=serialization.NoEncryption(),
- )
- )
- return JWKRSA(key=key)
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