How to add a certificate

Question

hello

i'm searching how to upload a certifcate ? 
 
 My provider send me some files ended with 
 
 .crt 
 .csr 
 .key 
 .ca-bundle

but don't know wich to use , only have to choose .pem .der .cer 
 
 someone a idea??

lferrara · Accepted Answer

Helmut, 
 you can use a Linux machine to convert crt to pem: 
 OpenSSL: Convert CRT to PEM: 
 Type the following code into your OpenSSL client: 
 openssl x509 -in cert.crt -out cert.pem 
 OpenSSL: Convert CER to PEM 
 openssl x509 -in cert.cer -out cert.pem 
 OpenSSL: Convert DER to PEM 
 openssl x509 -in cert.der -out cert.pem 
 or upload the certificate via Certificates on Windows Machine and then save it/export into PEM format. 
 Regards