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Requires the passcode for the .pfx file prior.

Extract .key file from .pfx file (will need to set a password here too):

openssl pkcs12 -in [yourfile.pfx] -nocerts -out [keyfile-encrypted.key]

Extract .crt file from .pfx file:

openssl pkcs12 -in [yourfile.pfx] -clcerts -nokeys -out [certificate.crt]

Extract pem formatted .key from previous .key:

openssl rsa -in [keyfile-encrypted.key] -outform PEM -out [keyfile-encrypted-pem.key]

Source:

• https://www.markbrilman.nl/2011/08/howto-convert-a-pfx-to-a-seperate-key-crt-file/