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Signed-off-by: Paul Elliott <paul.elliott@arm.com>
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Paul Elliott 2021-11-30 10:54:52 +00:00
parent 66491c7d08
commit 89c8e098ee
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docs/architecture/tls13-experimental.md
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@ -134,22 +134,22 @@ MVP definition
(1) This is just for comparison.
(2) The MVP sends only one shared secret corresponding to the configured
preferred group. This could, however end up with connection failure if the
server does not support our preferred curve, as we have yet to implement
HelloRetryRequest. The preferred group is the group of the first curve in
the list of allowed curves as defined by the configuration. The list of
mandatory-to-implement groups (in absence of an application profile
standard specifying otherwise) as defined in section 9.1 of the
specification gives the preferred order as follows: `secp256r1`, `x25519`,
`secp384r1` and finally `secp521r1`. If we could therefore fix the use of
`secp256r1`, then we would be guaranteed that the server supported it,
however our current curve preference order puts `x25519` before
`secp256r1` and changing this for only TLS1.3 would be potentially
difficult (we have no desire to change TLS1.2 behaviour). The likelyhood
of finding a server that doesn't support `x25519` is quite low and indeed
the end user could themselves change the order of preference of curves
using the `mbedtls_ssl_conf_curves()` API if they wished to do so, so we
are leaving the current preference order intact.
preferred group. This could, however end up with connection failure if the
server does not support our preferred curve, as we have yet to implement
HelloRetryRequest. The preferred group is the group of the first curve in
the list of allowed curves as defined by the configuration. The list of
mandatory-to-implement groups (in absence of an application profile
standard specifying otherwise) as defined in section 9.1 of the
specification gives the preferred order as follows: `secp256r1`, `x25519`,
`secp384r1` and finally `secp521r1`. If we could therefore fix the use of
`secp256r1`, then we would be guaranteed that the server supported it,
however our current curve preference order puts `x25519` before
`secp256r1` and changing this for only TLS1.3 would be potentially
difficult (we have no desire to change TLS1.2 behaviour). The likelyhood
of finding a server that doesn't support `x25519` is quite low and indeed
the end user could themselves change the order of preference of curves
using the `mbedtls_ssl_conf_curves()` API if they wished to do so, so we
are leaving the current preference order intact.
(3) The MVP proposes only TLS 1.3 and does not support version negotiation.
Out-of-protocol fallback is supported though if the Mbed TLS library