# swivel.vendors.signer

### Classes

#### Class `Signer` <a href="#id" id="id"></a>

> ```
> class Signer
> ```

**Methods**

**Method `prepare_data`**

> ```
> def prepare_data(
>     self
> )
> ```

Get the initial EIP712 compliant data dictionary to sign

**Method `prepare_domain`**

> ```
> def prepare_domain(
>     self,
>     d,
>     i,
>     a
> )
> ```

Update the data dictionary with the 'domain' entry

**Method `prepare_message`**

> ```
> def prepare_message(
>     self,
>     d,
>     o
> )
> ```

Update the data dictionary with the 'message' entry (Order)

**Method `sign_order`**

> ```
> def sign_order(
>     self,
>     o,
>     i,
>     a,
>     k
> )
> ```

Sign an order, producing an EIP712 compliant signature

### Parameters

o (dict) Swivel Order object

i (int) ChainId

a (string) Address of the deployed verifying contract

k (bytes) Private key as bytes

### Returns

The signature hex with 0x prefix normalized