anchor.diff:      WriteIVInfo = tls_v1:create_info(<<"iv">>, <<>>,  12),
   
       {WriteKey, WriteIV} = tls_v1:calculate_traffic_keys(HKDFAlgo, Cipher, SHSTrafficSecret).
  -
   
   
   create_info(Label0, Context0) ->
  
positive.code: 
      %% salt = Expanded
      HandshakeIKM =
          hexstr2bin("8bd4054f" "b55b9d63" "fdfbacf9" "f04b9f0d"
                     "35e6d63f" "537563ef" "d4627290" "0f89492d"),
  
      HandshakeSecret =
          hexstr2bin("1dc826e9" "3606aa6f" "dc0aadc1" "2f741b01"
                     "046aa6b9" "9f691ed2" "21a9f0ca" "043fbeac"),
  
      HandshakeIKM = crypto:compute_key(ecdh, CPublicKey, SPrivateKey, x25519),
  
  
negative.code:     Salt = binary:copy(<<?BYTE(0)>>, 32),
      IKM = binary:copy(<<?BYTE(0)>>, 32),
      EarlySecret =
          hexstr2bin("33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c
            e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a"),
  
      {early_secret, EarlySecret} = tls_v1:key_schedule(early_secret, HKDFAlgo, {psk, Salt}),
  
      %% {client}  create an ephemeral x25519 key pair:
      %%
  