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Enable X448 and FFDHE groups #401

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Enable X448 and FFDHE groups #401

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6 changes: 4 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -88,10 +88,12 @@ server name indication: 127.0.0.1

## TLS 1.3 HelloRetryRequest (HRR)

The default value of `-g` is `x448,x25519,p256`. To trigger HRR, omit the `-g` option. The first value is only used for key-share.
The first value of `-g` is used for key-share. To trigger HRR, add in first
position a value which will not be accepted by the server, for example use
`ffdhe2048,x25519,p256`.

```
% tls-simpleclient --tls13 -v --no-valid -O html-log.txt --http1.1 127.0.0.1 443
% tls-simpleclient --tls13 -v --no-valid -O html-log.txt --http1.1 -g ffdhe2048,x25519,p256 127.0.0.1 443
sending query:
GET / HTTP/1.1
Host: 127.0.0.1
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8 changes: 3 additions & 5 deletions core/Network/TLS/Parameters.hs
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Expand Up @@ -230,10 +230,8 @@ data Supported = Supported
-- extension. It is used in both clients and servers to restrict
-- accepted groups in DH key exchange.
--
-- The default value is ['X25519','P256','P384','P521'].
-- 'X25519' and 'P256' provide 128-bit security which is strong
-- enough until 2030. Both curves are fast because their
-- backends are written in C.
-- The default value includes all groups with security strength of 128
-- bits or more.
, supportedGroups :: [Group]
} deriving (Show,Eq)

Expand Down Expand Up @@ -261,7 +259,7 @@ defaultSupported = Supported
, supportedSession = True
, supportedFallbackScsv = True
, supportedEmptyPacket = True
, supportedGroups = [X25519,P256,P384,P521]
, supportedGroups = [X25519,X448,P256,FFDHE3072,FFDHE4096,P384,FFDHE6144,FFDHE8192,P521]
}

instance Default Supported where
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