This command extracts the private key from the .pfx file. Once entered you need to type in the importpassword of the .pfx file. This is the password that you used to protect your keypair when you created your .pfx file. Once you entered the import password OpenSSL requests you to type in another password, twice!. This new password will protect your .key file.
openssl pkcs12 -in [yourfile.pfx] -nocerts -out [keyfile-encrypted.key]
Now let’s extract the certificate:
openssl pkcs12 -in [yourfile.pfx] -clcerts -nokeys -out [certificate.crt]
Just press enter and your certificate appears.
openssl rsa -in [keyfile-encrypted.key] -out [keyfile-decrypted.key]
Again you need to enter an import password. This time you need to enter the new password that you created in step 1. After that you’re done. You decrypted your private key. In the folder you ran OpenSSL from you’ll find the certifcate (.crt) and the two private keys (encrypted and unencrypted).
In some cases you might be forced to convert your private key to PEM format. You can do so with the following command:
openssl rsa -in [keyfile-encrypted.key] -outform PEM -out [keyfile-encrypted-pem.key]