Generate custom CA certificate for burp to work with Android

burpcert.sh

# mkdir certificates && cd certificates
sudo apt-get install openssl
cp /usr/lib/ssl/openssl.cnf ./
openssl req -x509 -days 730 -nodes -newkey rsa:2048 -outform der -keyout server.key -out ca.der -extensions v3_ca -config openssl.cnf
openssl rsa -in server.key -inform pem -out server.key.der -outform der
openssl pkcs8 -topk8 -in server.key.der -inform der -out server.key.pkcs8.der -outform der -nocrypt
rm openssl.cnf
rm server.key
rm server.key.der