[openssl-users] overriding EVP_PKEY method callbacks for a specific key only

[Dmitry Belyavsky]

Well, you can use opaque pointer and own structure containing a flag and
switch between native and custom implementations depending on it.

I've tried it and it works

пн, 15 окт. 2018 г., 23:13 Selva Nair <selva.nair at gmail.com>:

> Hi,
>
> How to override the evp_pkey_sign method in EVP_PKEY_METHOD structure for
> a specific key? This is to allow signing with PSS padding using Windows CNG
> API.  Using rsa_priv_enc() we can only get pre-padded data when PSS is in
> use, but CNG does not seem to handle padding = none.
>
> Also see issue 7341 on github
> https://github.com/openssl/openssl/issues/7341
>
> I can use EVP_PKEY_meth_add0() to add a new method struct and that works.
> But that affect all keys. Is it possible to replace the evp_pkey_sign
> method on a specific key instance like one can do for RSA or EC methods?
>
> Thanks,
>
> Selva
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