![]() This indicates to us that the server is waiting for a connection request. ![]() You should see an ACCEPT message in the command window, as shown below. Openssl s_server -key Server.key -cert Server.crt -accept 4433 To get your server up and running, type the following command from your command line: The resulting files that you will need are Server.key and Server.crt. In addition, you can find the article that walks through how to use them here. New, TLSv1.2, Cipher is ECDHE-ECDSA-AES256-GCM-SHA384 Verification error: unable to verify the first certificate SSL handshake has read 841 bytes and written 386 bytes This is where you’ll find most of the information you can use to troubleshoot and test different aspects of your application, such as the protocol, the cipher suite used, the session ID or ticket, etc. Below the server certificate are a few sections that give most of the details on the actual connection. It’s fairly unintelligible on its own, so we’ve left that chunk out. Underneath this section, we have the server certificate itself. I:/C=US/ST=CA/L=San Diego/O=NetBurner, Cert Auth/CN=NetBurner, Cert Auth Certificate chainĠ s:/C=US/ST=CA/L=San Diego/O=NetBurner, Server/CN=10.1.1.128 We have the certificate authority we created to sign the server’s certificate and the server certificate itself. Because we created self-signed certificates for use in this example, this list is very short. The second section of the client connection output shows the certificate chain. Fortunately, we have some scripts that make this incredibly easy to do, as well as an article detailing the steps explaining how to do it. Therefore, to use this flag with our above example, you would need to recreate your own self-signed certs. While we provide the self-signed certificates to use in the examples, we don’t provide the corresponding Certificate Authority certificate used to generate them. If you wanted to do this, you would add the certificate authority file with the -CAfile flag. The verify error listed here is because we’re using a self-signed certificate and didn’t provide the certificate authority’s certificate needed to validate the server’s certificate (a critical step in any production environment). Verify error:num=21:unable to verify the first certificate Verify error:num=20:unable to get local issuer certificateĭepth=0 C = US, ST = CA, L = San Diego, O = "NetBurner, Server", CN = 10.1.1.128 The first section shows a little bit of information about the server certificate that was sent: depth=0 C = US, ST = CA, L = San Diego, O = "NetBurner, Server", CN = 10.1.1.128 In fact, let’s take a minute to review what we’re actually seeing here. The information above that, however, is pretty interesting and gives some specific information about the connection itself. The list of numbers is just test data that the module sends to verify the connection’s functionality. If your device is connected to your local network and you have internet access, this is as easy as opening your browser and going to .įrom your command line window, you’ll see a bunch of text scroll by, as shown in the image below, followed by a fairly long list of numbers. To load these applications on your device, you’ll first need to know its IP address. Like most of our examples, we have tried to make both of these a great launching point for more complex and complete applications. The server is in the folder sslserver, while the client is in the folder sslclient. You can find the example code for both of these in /examples/ssl/. In this article, we’re going to use two examples to help demonstrate testing with OpenSSL. The resulting output should look something like the following image. This command will display a very condensed list of what ciphers are currently available. If you want to see your current list of available ciphers, you can use the command, openssl ciphers. ![]() To determine what version of OpenSSL you currently have installed on your computer, open a command prompt and type the command, openssl version. ![]()
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