The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for EMSA-PKCS1-v1_5.

It is assumed that the Consumer has provided its RSA public key in a verified way to the Service Provider, in a manner which is beyond the scope of this specification. - Chapter 9.3 ("RSA-SHA1")

### Methods

## Build up the signature NOTE: The output of this function MUST NOT be urlencoded.

    build_signature(\OAuthRequest $request, \OAuthConsumer $consumer, \OAuthToken $token) : string

the encoding is handled in OAuthRequest when the final request is serialized

### Parameters

#### $request

`\OAuthRequest`

#### $consumer

`\OAuthConsumer`

#### $token

`\OAuthToken`

### Returns

`string`

## Verifies that a given signature is correct

    check_signature(\OAuthRequest $request, \OAuthConsumer $consumer, \OAuthToken $token, string $signature) : bool

### Parameters

#### $request

`\OAuthRequest`

#### $consumer

`\OAuthConsumer`

#### $token

`\OAuthToken`

#### $signature

`string`

### Returns

`bool`

## Needs to return the name of the Signature Method (ie HMAC-SHA1)

    get_name() : string

### Returns

`string`

## fetch_private_cert()

    fetch_private_cert($request)

### Parameters

#### $request

## fetch_public_cert()

    fetch_public_cert($request)

### Parameters

#### $request