elliptic_curve::SecretKey supports to_sec1_der_with_oid

[heliannuuthus]

I see that the to_sec1_der() method currently specifies EcParameters::NamedCurve as Option::None. In the protocol(sec1#114), I see that this field is optional. Can I set it to the correct value or provide another method to return OID?

[tarcieri]

It can be changed to introspect AssociatedOid and include it in the serialized document

[tarcieri]

You're also free to change it yourself, though it should probably be included by default

[heliannuuthus]

You're also free to change it yourself, though it should probably be included by default您也可以自己更改它，尽管它可能应该默认包含在内

got it~, thanks :)