You can do this via openssl:
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Install openssl package (if you are using Windows, download binaries here).
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Generate private key:
openssl genrsa 2048 > private.pem -
Generate the self signed certificate:
openssl req -x509 -days 1000 -new -key private.pem -out public.pem -
If needed, create PFX:
openssl pkcs12 -export -in public.pem -inkey private.pem -out mycert.pfx