[tpmdd-devel] in-kernel user of ecdsa

Stephan Mueller smueller at chronox.de
Mon Mar 12 21:57:28 UTC 2018

Am Montag, 12. März 2018, 22:55:35 CET schrieb James Bottomley:

Hi James,

> > ECDSA is not implemented currently in the kernel crypto API.
> an ECDSA signature is produced as a ECDH operation using the DSA
> algorithm instead of KDFe, so it's trivial with what we have; signature
> verification involves a separate point addition but we have all the
> primitives for this in crypto/ecc.c so adding it isn't really
> difficult, is it?

No, it is not. There even was a patch posted about a year ago to add ECDSA. 
But it was rejected due to missing in-kernel users. I guess that patch could 
be reactivated.


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