Create a self signed openSSL certificate for macOS

gistfile1.txt

#server.key can be named anything you like, remember to update the .conf files accordingly
1 ) openssl genrsa -des3 -out server.key 2048
#update localhost to whatever dynamic dns you have set up, or use IP:127.0.0.1
2 ) openssl req \
    -newkey rsa:2048 \
    -x509 \
    -nodes \
    -keyout server.key \
    -new \
    -out server.crt \
    -subj /CN=localhost \
    -reqexts SAN \
    -extensions SAN \
    -config <(cat /System/Library/OpenSSL/openssl.cnf \
        <(printf '[SAN]\nsubjectAltName=DNS:localhost')) \
    -sha256 \
    -days 3650
3 ) cp server.key server.tmp
4 ) openssl rsa -in server.tmp -out server.key
5 ) cp server.crt /Applications/MAMP/conf/apache
6 ) cp server.key /Applications/MAMP/conf/apache