On Mon, Sep 22, 2025 at 9:44 AM Dang, Quynh H. (Fed) <quynh.dang=
[email protected]> wrote:

>
>
> If the pure mode is used, then some warning about the hash function choice
> from the IKE’s negotiation would be good (not to reduce the security of the
> signing algorithm).  In this case, IKE hashes with the negotiated and
> agreed hash function, then the signing algorithm has its own internal hash
> function.
>

Is there ever a reason for these two hash functions to not be the same?

>
>
> If the pre-hash is used, then the pre-hash algorithm can come from the
> IKE’s hash function negotiation, and it should meet the security strength
> of the signing function.
>

That seems overly liberal to me.

Paul
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