Re: [PATCH v12 06/10] crypto: Add supplementary info param to asymmetric key signature verification

[Jarkko Sakkinen]

On Tue, Jan 20, 2026 at 02:03:21PM -0800, Eric Biggers wrote:
> On Thu, Jan 15, 2026 at 09:50:48PM +0000, David Howells wrote:
> > Add a supplementary information parameter to the asymmetric key signature
> > verification API, in particular crypto_sig_verify() and sig_alg::verify.
> > This takes the form of a printable string containing of key=val elements.
> 
> As I'm sure you're aware, C has native support for function parameters.
> No need to serialize to a string on the caller side and then deserialize
> in the callee.
> 
> This is yet another example of a case where trying to fit different
> algorithms into a generic API doesn't work well.
> 
> We should just have a library API for each signature algorithm, with
> each algorithm taking the parameters it needs.

This would be a great idea IMHO. I'm looking into renewing my TPM2
asymmetric keys patch set some day, and e.g., for that such primitives
would be more ergonomic fit.

> 
> - Eric

BR, Jarkko