Does InterSSL deliver SSL certificates for ECC (Elliptic Curve Cryptography) and ECDSA ?

Yes, all SSL certificates from SECTIGO (formerly COMODO) also support ECC (Elliptic Curve Cryptography), to be more precise they are supporting ECDSA keys. Supported: prime256v1 and secp384r1.

This is an example for openssl how to create a key/CSR pair for ECDSA:

 openssl ecparam -genkey -name prime256v1 | openssl ec -out ec.key openssl req -new -key ec.key -out ec.csr

You can also reissue your certificate from RSA to ECC algorithm. As a bonus, your RSA certificate will remain valid, hence you can install both on your server.

Please ensure that also your server is properly configured for ECC / ECDSA!

DigiCert too is offering additional information regarding ECC / ECDSA certificates:

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