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Added cookie extension support + enhance extension parsing

Nikos Mavrogiannopoulos requested to merge tmp-draft-ietf-tls-tls13-21-nmav-backports2 into tmp-draft-ietf-tls-tls13-21

Add support for TLS cookie extension

This adds support for TLS cookie extension used during the handshake (Hello retry request + Client Hello). In addition that optimizes various code paths in the extension handling.

Checklist

  • Code modified for Cookie extension
  • Add support for extensions which are server-only (cookie is one of them)
  • Provide a simple API for storing data and retrieving data per extension
  • Eliminate loops when associating/retrieving data to/from extensions
  • Test suite updated with functionality tests

Resolves #218 (closed)

Edited by Nikos Mavrogiannopoulos

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