Converting Certificates With Using OpenSSL

Introduction

Below I will present commands which allow you to convert certificates/keys to different formats with using OpenSSL. It is very useful when we need it compatible with specific types of servers.

Let’s start

• DER to PEM

root@vagrant:/home/vagrant# openssl x509 -inform der -in example.cer -out example.pem

• PEM to DER

root@vagrant:/home/vagrant# openssl x509 -outform der -in example.pem -out example.der

• PKCS#12 file with private key and certificates to PEM

root@vagrant:/home/vagrant# openssl pkcs12 -in example.pfx -out example.pem -nodes

• PEM certificate file and a private key to PKCS#12

root@vagrant:/home/vagrant# openssl pkcs12 -export -out example.pfx -inkey example.key -in example.crt -certfile CACert.crt

• PEM to CRT

root@vagrant:/home/vagrant# openssl x509 -outform der -in example.pem -out example.crt

• PEM to P7B

root@vagrant:/home/vagrant# openssl crl2pkcs7 -nocrl -certfile example.cer -out example.p7b -certfile CACert.cer

• PEM to PFX

root@vagrant:/home/vagrant# openssl pkcs12 -export -out example.pfx -inkey example.key -in example.crt -certfile CACert.crt

• P7B to PEM

root@vagrant:/home/v…