On 10/2/20 14:15, I wrote:
The server also needs to know the entire HelloRetryRequest message
since this goes into the Transcript Hash calculation:

   Transcript-Hash(ClientHello1, HelloRetryRequest, ... Mn) =
       Hash(message_hash ||        /* Handshake type */
            00 00 Hash.length  ||  /* Handshake message length (bytes) */
            Hash(ClientHello1) ||  /* Hash of ClientHello1 */
            HelloRetryRequest  || ... || Mn)

Please don't tell me all the current TLS 1.3 implementations
forgot to include the HelloRetryRequest in the transcript hash.

Mike

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