To serve SHA-256 secured content, your website must be hosted on an SHA-2 compatible server and secured by a certificate with an SHA-256 / RSA signature.
Server Compliance:
Symantec has published a list of operating systems, web servers, and browsers that are compatible, as well as a list of known web servers that are NOT SHA-2 compatible. All HostGator servers are SHA-2 compliant. The complete compatibility list is available here:
SSL Certificate Encryption:
The level of your encryption is determined by the certificate issuer. HostGator currently provides SSLs from COMODO that use SHA-256 signatures. You may check the signature of your SSL by entering your SSL encrypted domain on this website.
Enter your domain and click Check. The new page will list details of your SSL certificate. Locate the Signature line; if this line lists SHA-256 / RSA, then your SSL is encrypted with SHA-256. If it is not, you will need to contact your SSL issuer to have your certificate re-issued. If you are using a third-party SSL, you will need to then request to have the re-issued certificate installed for you.