Ensure all encryption functions are implemented

[MikhailMS]

In FreeRADIUS docs I found following bit

The "encrypt" flag marks the attribute as being encrypted with one of
three possible methods:
1. Means that the attribute is encrypted
with the method as defined in [RFC2865](https://datatracker.ietf.org/doc/html/rfc2865) for the User-Password
attribute
2 . Means that the password is encrypted with the method
as defined in [RFC2868](https://datatracker.ietf.org/doc/html/rfc2868) for the Tunnel-Password attribute
3. Means that the attribute is encrypted as per Ascend's definitions for the Ascend-Send-Secret attribute

1 is already completed, not so sure about 2 and the method 3 is definitely not implemented