Added support for RFC5424 structured data (#67)

* Added support for RFC5424 structured data

Signed-off-by: Tero Saarni <tero.saarni@est.tech>

Author: tsaarni

CHANGELOG.md

@@ -2,6 +2,7 @@
   - Change codec instance comparison [#69](https://github.com/logstash-plugins/logstash-output-syslog/pull/69)
   - Added support for RFC5424 structured data [#67](https://github.com/logstash-plugins/logstash-output-syslog/pull/67)
   - The SNI (Server Name Indication) extension is now used when connecting to syslog server with TLS and `host` is set to FQDN (Fully Qualified Domain Name) [#66](https://github.com/logstash-plugins/logstash-output-syslog/pull/66)
+  - Support loading of PKCS8 EC private keys [#61](https://github.com/logstash-plugins/logstash-output-syslog/pull/61)
 
 ## 3.0.5
   - Docs: Set the default_codec doc attribute.

lib/logstash/outputs/syslog.rb

@@ -238,7 +238,7 @@ def setup_ssl
     require "openssl"
     ssl_context = OpenSSL::SSL::SSLContext.new
     ssl_context.cert = OpenSSL::X509::Certificate.new(File.read(@ssl_cert))
-    ssl_context.key = OpenSSL::PKey::RSA.new(File.read(@ssl_key),@ssl_key_passphrase)
+    ssl_context.key = OpenSSL::PKey::read(File.read(@ssl_key),@ssl_key_passphrase)
     if @ssl_verify
       cert_store = OpenSSL::X509::Store.new
       # Load the system default certificate path to the store