Gilles Peskine b4e815f638 DHM blinding: don't accept P-1 as a blinding value
P-1 is as bad as 1 as a blinding value. Don't accept it.

The chance that P-1 would be randomly generated is infinitesimal, so
this is not a practical issue, but it makes the code cleaner. It was
inconsistent to accept P-1 as a blinding value but not as a private key.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-02 21:36:26 +02:00
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