Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 1 – Converting a DER certificate file to PEM format
Cisco VCS Deployment Guide: Certificate creation and use with Cisco VCS
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Appendix 1 – Converting a DER certificate file
to PEM format
to PEM format
A private key, root (CA) certificate and the server / client certificate can be generated using 3
rd
party
tools (or purchased from a certificate authority), and may be generated as PEM (required format,
extension .pem) or DER (extension .cer) format files.
extension .pem) or DER (extension .cer) format files.
Certificates must be in PEM format for use on the Cisco VCS. Conversion from DER to PEM format
can be done in one of two ways, either using OpenSSL or Windows, as documented in the following
sections.
can be done in one of two ways, either using OpenSSL or Windows, as documented in the following
sections.
Converting a DER certificate file to a PEM file using OpenSSL
To convert from DER to PEM format, on a system running openssl, execute the command line:
openssl x509 -in <filename>.cer -inform DER -out <filename>.pem -outform PEM
Converting a DER certificate file to a PEM file using Microsoft
Windows
Windows
1. Double click on the DER file to convert (this will likely have a ‘.cer’ extension).