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Client, Server and CA Certificate with OpenSSL

Client, Server and CA Certificate with OpenSSL

In this post, We will learn how to create CA key, CA certificate, server key, the server CSR and client key, the client CSR. We will also see how to create a client, server certificate and sign it with CA certificate with OpenSSL command on Ubuntu.

Create the CA Key and Certificate for signing Client Certs

 openssl genrsa -des3 -out ca.key 4096  
 openssl req -new -x509 -days 365 -key ca.key -out ca.crt

Create the Server Key, CSR, and Certificate

 openssl genrsa -des3 -out server.key 1024  
 openssl req -new -key server.key -out server.csr

Self-sign the certificate with our CA cert

 openssl x509 -req -days 365 -in server.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out server.crt

Create the Client Key and CSR

 openssl genrsa -des3 -out client.key 1024  
 openssl req -new -key client.key -out client.csr

Sign the client certificate with our CA cert

 openssl x509 -req -days 365 -in client.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out client.crt

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
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