Keys were created with these commands:

openssl ecparam -out ec_param.pem -name prime256v1
openssl ecparam -in ec_param.pem -genkey -out ec_priv.pem
openssl ecparam -in ec_param.pem -genkey | openssl ec -aes256 -out \
   ec_priv_encrypted.pem
   with 'cartman' as passphrase
