I just received word that my ESP (Email Service Provider) is migrating to a Gmail platform. That means trouble for me as Gmail enforces TLS. So I have had to divert my attention to addressing this particular issue, as my current email client (JACMail) does not support TLS. I had a feeling that something like this would pop up, so I have been working at developing code for TLS 1.3.
Gmail says that it supports TLS 1.3, using TLS_AES_128_GCM_SHA256 and TLS_AES_256_GCM_SHA384. Unfortunately, it doesn't say what curves it accepts. In a Google Cloud page it says that TLS 1.2 uses "secp256r1", but TLS 1.3 uses x25519. Unfortunately, a footnote at the bottom says "TLS 1.3 is not yet finalized", which suggests that the article is not current. My OS (Win 8.1) does not support x25519.
Does anyone know what Elliptical curves Gmail supports?
J.A. Coutts
Gmail says that it supports TLS 1.3, using TLS_AES_128_GCM_SHA256 and TLS_AES_256_GCM_SHA384. Unfortunately, it doesn't say what curves it accepts. In a Google Cloud page it says that TLS 1.2 uses "secp256r1", but TLS 1.3 uses x25519. Unfortunately, a footnote at the bottom says "TLS 1.3 is not yet finalized", which suggests that the article is not current. My OS (Win 8.1) does not support x25519.
Does anyone know what Elliptical curves Gmail supports?
J.A. Coutts