create_timestamp

        # OpenSSL::Timestamp::Factory.create_timestamp

(from ruby core)
### Implementation from Factory
---
    factory.create_timestamp(key, certificate, request) -> Response

---

Creates a Response with the help of an OpenSSL::PKey, an
OpenSSL::X509::Certificate and a Request.

Mandatory parameters for timestamp creation that need to be set in the
Request:

*   Request#algorithm
*   Request#message_imprint


Mandatory parameters that need to be set in the Factory:
*   Factory#serial_number
*   Factory#gen_time
*   Factory#allowed_digests


In addition one of either Request#policy_id or Factory#default_policy_id
must be set.

Raises a TimestampError if creation fails, though successfully created
error responses may be returned.