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Fix NULL deference when validating FFC public key.
Fixes CVE-2023-0217 When attempting to do a BN_Copy of params->p there was no NULL check. Since BN_copy does not check for NULL this is a NULL reference. As an aside BN_cmp() does do a NULL check, so there are other checks that fail because a NULL is passed. A more general check for NULL params has been added for both FFC public and private key validation instead. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org>
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