https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.rsa.importrsaprivatekey?view=netstandard-2.1&viewFallbackFrom=netcore-3.0
RSA.ImportRSAPrivateKey(ReadOnlySpanByte, Int32) Method (System.Security.Cryptography) |...
Imports the public/private keypair from a PKCS#1 RSAPrivateKey structure after decryption, replacing the keys for this object.
system securityrsamethodcryptography