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About PKCS_12

Wikipedia:

In cryptography, PKCS #12 defines an archive file format for storing many cryptography objects as a single file. It is commonly used to bundle a private key with its X.509 certificate or to bundle all the members of a chain of trust.

Get certificate and private key from P12 file

openssl pkcs12 -in file.p12 -out package.pem -nodes
cp package.pem myapp.domain.fr.key
cp package.pem myapp.domain.fr.cert

Extract certificate

Edit myapp.domain.fr.key and keep only the certificate section from -----BEGIN CERTIFICATE----- to -----END CERTIFICATE-----

Extract private key

Edit myapp.domain.fr.key and keep only the certificate section from -----BEGIN PRIVATE KEY----- to -----BEGIN PRIVATE KEY-----

 Configure your webserver

Move files

mv myapp.domain.fr.cert /etc/ssl/certs/
mv myapp.domain.fr.key /etc/ssl/private

Configure your virtual host

SSLCertificateFile  /etc/ssl/certs/myapp.domain.fr.cert
SSLCertificateKeyFile /etc/ssl/private/myapp.domain.fr.key