[Opendnssec-develop] Botan version

[Rickard Bellgrim]

Hi

Before I committed the code today, SoftHSM did not reuse the PK_Signer
object. It worked ok in Botan 1.8.X, but it would get some performance
issues in Botan 1.9 and Botan 1.10.

I realized however that there is a bug in Botan prior to the latest
releases that caused a problem when you reuse the object and where
running EMSA3(RAW) (== CKM_RSA_PKCS).

Should I increase the required Botan version or try to detect which
version are used and then apply the optimization?

// Rickard