Extract certificate and key from .pfx file
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Extract the certificate from the .pfx file:
openssl pkcs12 -in <DOT_PFX_FILE> -clcerts -nokeys -chain -out certificate.crt
Extract the private key in .pem format without encryption from the .pfx file:
openssl pkcs12 -in <DOT_PFX_FILE> -nocerts -nodes -out private_key.pem
Convert the .pem into RSA key format:
openssl rsa -in private_key.pem -out id_rsa
If you are using OpenSSL 3 it will default it’s output to be in PKCS8 format, that contains encapsulation boundaries like this: