diff --git a/misspy/ext/auth/legacy.py b/misspy/ext/auth/legacy.py
new file mode 100644
index 0000000..e6c0563
--- /dev/null
+++ b/misspy/ext/auth/legacy.py
@@ -0,0 +1,41 @@
+from typing import Union, List
+
+import aiohttp
+from mitypes.user import User
+
+from ...core.types.internal import auth_session
+from ...core.types.other import App
+from ...core.exception import AuthFailed
+
+class session:
+    def __init__(self) -> None:
+        pass
+
+    async def generate(
+        self,
+        host: str,
+        name: str,
+        description: str,
+        permission: List[str],
+        callback: Union[str, None] = None,
+    ):
+        async with aiohttp.ClientSession() as session:
+            async with session.post("https://{}/api/app/create".format(host), data={"name": name, "description": description, "permission": permission, "callbackUrl": callback}) as resp:
+                authApp = App(**await resp.json())
+                async with session.post("https://{}/api/auth/session/generate".format(host), data={"appSecret": authApp.secret}) as resp2:
+                    resp2 = await resp2.json()
+                    return auth_session(host, authApp.secret, resp2["token"], resp2["url"])
+
+    async def check(
+        self,
+        authSession: auth_session
+    ):
+        async with aiohttp.ClientSession() as session:
+            async with session.post("https://{}/api/auth/session/userkey".format(authSession.host)) as resp:
+                resp = await resp.json()
+                if resp.get("accessToken") is not None:
+                    resp_i: dict = resp["user"]
+                    resp_i["accessToken"] = resp["accessToken"]
+                    return User(**resp_i)
+                else:
+                    raise AuthFailed(resp)
\ No newline at end of file
diff --git a/misspy/ext/auth/miauth.py b/misspy/ext/auth/miauth.py
new file mode 100644
index 0000000..de7cdba
--- /dev/null
+++ b/misspy/ext/auth/miauth.py
@@ -0,0 +1,52 @@
+import urllib.parse
+from typing import Union, List
+import uuid
+
+import aiohttp
+
+from ...core.types.internal import miauth_session
+from ...core.types.user import User
+from ...core.exception import MiAuthFailed, NotFound
+
+class session:
+    def __init__(self) -> None:
+        pass
+
+    async def generate(
+        self,
+        host: str,
+        name: Union[str, None] = None,
+        icon: Union[str, None] = None,
+        callback: Union[str, None] = None,
+        permission: Union[List[str], None] = None,
+    ):
+        sessionId = uuid.uuid4()
+        url = urllib.parse.urlparse("https://{}".format(host))
+        params = urllib.parse.parse_qs(url.query)
+        if name:
+            params["name"] = name
+        if icon:
+            params["icon"] = icon
+        if callback:
+            params["callback"] = callback
+        if permission:
+            params["permission"] = ",".join(permission)
+        generated_session = miauth_session(sessionId, host, urllib.parse.urlunparse(url._replace(query=urllib.parse.urlencode(params, doseq=True))), name, icon, callback, permission)
+        return generated_session
+
+    async def check(
+        self,
+        authSession: miauth_session
+    ):
+        async with aiohttp.ClientSession() as session:
+            async with session.post("https://{}/api/miauth/{}/check".format(authSession.host, authSession.sessionId)) as resp:
+                try:
+                    resp = await resp.json()
+                except aiohttp.ContentTypeError:
+                    raise NotFound('API endpoint "miauth/{}/check" does not exist. The version of Misskey you are using may be older than 12.27.0.'.format(authSession.sessionId))
+                resp_i: dict = resp["user"]
+                resp_i["token"] = resp["token"]
+                if resp.get("token") is not None:
+                    return User(**resp_i)
+                else:
+                    raise MiAuthFailed(resp)
\ No newline at end of file
diff --git a/misspy/ext/auth/oauth.py b/misspy/ext/auth/oauth.py
new file mode 100644
index 0000000..998ef7a
--- /dev/null
+++ b/misspy/ext/auth/oauth.py
@@ -0,0 +1 @@
+# とりあえず未実装。OAuthは:neko_dakara_wakannyai2:
\ No newline at end of file