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tls: use QHKDF-Expand instead of QHKDF-Update #1228

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merged 1 commit into from Mar 18, 2018
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tls: use QHKDF-Expand instead of QHKDF-Update #1228

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4 changes: 2 additions & 2 deletions draft-ietf-quic-tls.md
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Expand Up @@ -800,9 +800,9 @@ the PRF hash function.

~~~
client_pp_secret_<N+1> =
QHKDF-Update(client_pp_secret_<N>, "client 1rtt", Hash.length)
QHKDF-Expand(client_pp_secret_<N>, "client 1rtt", Hash.length)
server_pp_secret_<N+1> =
QHKDF-Update(server_pp_secret_<N>, "server 1rtt", Hash.length)
QHKDF-Expand(server_pp_secret_<N>, "server 1rtt", Hash.length)
~~~

This allows for a succession of new secrets to be created as needed.
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