test_ifaces.c genarating 512 bit key instead of 2048.

[Dhananjay-Khairnar]

we are working on GCS software where I am using libnpnt implimentation. I come across function init_ecc_keypair in file test_ifaces.c. In this function genarated key is 512 bit, but in dgca guidline they mention to use 2048 bit key.

http://www.dgca.nic.in/rpas/DGCA%20RPAS%20Guidance%20Manual.pdf

3.2.4 Certificates and Keys Policies

1. Below are the currently supported algorithms for digital signing:
   a. SHA256withRSA (2048 bit key)
   b. ECDSA with safecurves (https://safecurves.cr.yp.to)
2. All Flight Module Provider certificates should be procured from a certification
   authority (CA) as per Indian IT Act.
   (http://www.cca.gov.in/cca/?q=licensed_ca.html)
3. All Flight Module Provider certificates should be class II or class III and X509
   v3 compliant.
4. Organization attribute in the certificate’s subject SHOULD match the Flight
   Module Provider’s name registered with DGCA
   Do we have to use RSA here to genarate 2048 bit key?