1 .cer application/pkix-cert
2 .crl application/pkix-crl
3 .gpg application/pgp-encrypted
4 .p10 application/pkcs10
5 .p12 application/pkcs12
6 .p7c application/pkcs7-mime
7 .p7m application/pkcs7-mime
8 .p7s application/pkcs7-signature
10 .p8e application/pkcs8-encrypted
11 .pem application/x-pem-file
12 .pfx application/pkcs12