Blinding implementation in OpenSSL

[Tomas Mraz]

On Mon, 2019-04-15 at 10:39 +0300, Dmitry Belyavsky wrote:
> Hello,
> 
> Could you please explain how blinding works in OpenSSL?
> 
> EC_KEY structure seems to have an unblinded private key structure and
> blinded X, Y, Z- coordinates of the public key when blinding is in
> use. But if I understand correctly, he idea of blinding is protecting
> the private key from extracting from memory/swap/etc? Am I wrong?

No, blinding is done during the private key operations to "randomize"
the computations so timing and other side channels do not leak the
private key. The private key itself is not modified.

-- 
Tomáš Mráz
No matter how far down the wrong road you've gone, turn back.
                                              Turkish proverb
[You'll know whether the road is wrong if you carefully listen to your
conscience.]