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A third-party app I have requires a *.pem certificate to be able to open a wss connection. How can I generate a *.pem file, keeping in mind that I need that only for testing, therefore I want an easy, not necessarily a really secure way to do so.

I'm on Arch Linux.

  • What exactly does that application require from the certificate? – kasperd Dec 26 '17 at 6:21
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first generate CSR and KEY:

openssl req -new -newkey rsa:4096 -nodes -keyout snakeoil.key -out snakeoil.csr

then generate PEM and self-sign with KEY:

openssl x509 -req -sha256 -days 365 -in snakeoil.csr -signkey snakeoil.key -out snakeoil.pem
| improve this answer | |
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    the app says "use_private_key_file: no start line" - any idea why? – Raj Dec 26 '17 at 1:52
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    it seems your app can a) not find or read the key file (check path/permissions) or b) the key is not starting with "-----BEGIN PRIVATE KEY-----" – Fabian Dec 26 '17 at 12:54

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