hello,
yes it is possible, encryption keys are usually only flat text file so you can analyze content / format. so you could:
- search for specific filename
- search for simple keywords in files (e.g. "-----BEGIN RSA PRIVATE KEY-----")
you may edit one of your companys private keys on order to check exact format especially if you want to go deeper in content analysis (like using a DI with a custom validator or a regexp)
regards