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# Shared-Secret Registration
This API allows for the creation of users in an administrative and
non-interactive way. This is generally used for bootstrapping a Synapse
instance with administrator accounts.
To authenticate yourself to the server, you will need both the shared secret
([`registration_shared_secret`](../configuration/config_documentation.md#registration_shared_secret)
in the homeserver configuration), and a one-time nonce. If the registration
shared secret is not configured, this API is not enabled.
To fetch the nonce, you need to request one from the API:
```
> GET /_synapse/admin/v1/register
< {"nonce": "thisisanonce"}
```
Once you have the nonce, you can make a `POST` to the same URL with a JSON
body containing the nonce, username, password, whether they are an admin
(optional, False by default), and a HMAC digest of the content. Also you can
set the displayname (optional, `username` by default).
As an example:
```
> POST /_synapse/admin/v1/register
> {
"nonce": "thisisanonce",
"username": "pepper_roni",
"displayname": "Pepper Roni",
"password": "pizza",
"admin": true,
"mac": "mac_digest_here"
}
< {
"access_token": "token_here",
"user_id": "@pepper_roni:localhost",
"home_server": "test",
"device_id": "device_id_here"
}
```
The MAC is the hex digest output of the HMAC-SHA1 algorithm, with the key being
the shared secret and the content being the nonce, user, password, either the
string "admin" or "notadmin", and optionally the user_type
each separated by NULs.
Here is an easy way to generate the HMAC digest if you have Bash and OpenSSL:
```bash
# Update these values and then paste this code block into a bash terminal
nonce='thisisanonce'
username='pepper_roni'
password='pizza'
admin='admin'
secret='shared_secret'
printf '%s\0%s\0%s\0%s' "$nonce" "$username" "$password" "$admin" |
openssl sha1 -hmac "$secret" |
awk '{print $2}'
```
For an example of generation in Python:
```python
import hmac, hashlib
def generate_mac(nonce, user, password, admin=False, user_type=None):
mac = hmac.new(
key=shared_secret,
digestmod=hashlib.sha1,
)
mac.update(nonce.encode('utf8'))
mac.update(b"\x00")
mac.update(user.encode('utf8'))
mac.update(b"\x00")
mac.update(password.encode('utf8'))
mac.update(b"\x00")
mac.update(b"admin" if admin else b"notadmin")
if user_type:
mac.update(b"\x00")
mac.update(user_type.encode('utf8'))
return mac.hexdigest()
```
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