Private key parameters support in PqcPrivateKeyInfoFactory.CreatePrivateKeyInfo
It seems there is some code missing for creating private key info from FrodoPrivateKeyParameters.
Yes, actually there was quite a bit missing for Frodo, including entries in all the PQC factory classes, which I've now added. Thanks for the report.
Glad to help!
When I'm trying to implement NTRUEncrypt, I get the same problem with NtruPrivateKeyParameters. When I look for the sequence "ntru" in the PqcPrivateKeyInfoFactory.CreatePrivateKeyInfo code, I get no matches, so I assume the same issue also applies for NTRUSign, too.
FrodoKEM key info serialization has been fixed with the latest NuGet package version 2.3.0. Anyway, the problem with NTRUEncrypt key serialization still persists.