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How to get .crt and .pem certificate files from .cer

 原文  2017-11-20 14:07:22  9   1    ssl

Question

I have .cer certificate which is not readable using text editor. I need to convert it to .pem and .crt in order to upgrade files on the server.

As I can see .crt file begins with -----BEGIN CERTIFICATE-----

.pem file begins with -----BEGIN RSA PRIVATE KEY-----

Can I get both or these files from .cer file or do I need something else?

1 answers

solution1
 1 ACCPTED  2017-11-20 17:30:57

  • .crt and .cer files contain certificates, encoded as binary DER or ascii PEM

  • .pem files can contain certificates or keys

See http://www.gtopia.org/blog/2010/02/der-vs-crt-vs-cer-vs-pem-certificates/

You can convert a binary .cer to .pem encoding the content in base64 and adding -----BEGIN CERTIFICATE----- header and END CERTIFICATE footer, but to get a -----BEGIN RSA PRIVATE KEY----- you will need a file with a private key. Typically .key file

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