Implement ECC PKCS#12 certificates

[DoctorD90]

I use certs to login on server; the certificate is based on ECC private key; I converted it to PKCS#12 format but the app couldn't load it; the certificate is usable from other program, so the certificate is well created.

I report commands to reproduce the same certificate:

openssl ecparam -genkey -name prime256v1 -out login.key
openssl req -new -sha512 -key login.key -out login.csr -subj "/CN=User"
openssl req -x509 -sha512 -days 3650 -key login.key -in login.csr -out login.crt
openssl pkcs12 -export -inkey login.key -in login.crt -out login.pkcs12.pfx

[MCMrARM]

presumably i only added RSA support; would have to be looked into