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Add DTLS 1.3 Unified Header#793

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Add DTLS 1.3 Unified Header#793
theodorsm wants to merge 3 commits intomasterfrom
theodorsm/record_layer_13

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@theodorsm theodorsm commented Feb 5, 2026

Description

This PR implements the new DTLS 1.3 Unified Header that is part of the new record layer encoding.

https://datatracker.ietf.org/doc/html/rfc9147#name-the-dtls-record-layer:

    0 1 2 3 4 5 6 7
    +-+-+-+-+-+-+-+-+
    |0|0|1|C|S|L|E E|
    +-+-+-+-+-+-+-+-+
    | Connection ID |   Legend:
    | (if any,      |
    /  length as    /   C   - Connection ID (CID) present
    |  negotiated)  |   S   - Sequence number length
    +-+-+-+-+-+-+-+-+   L   - Length present
    |  8 or 16 bit  |   E   - Epoch
    |Sequence Number|
    +-+-+-+-+-+-+-+-+
    | 16 bit Length |
    | (if present)  |
    +-+-+-+-+-+-+-+-+

Reference issue

Partly fixes #755

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codecov bot commented Feb 5, 2026 •
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Codecov Report

❌ Patch coverage is 75.43860% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.47%. Comparing base (956d41d) to head (291de58).

Files with missing lines Patch % Lines
pkg/protocol/recordlayer/header_13.go 74.54% 7 Missing and 7 partials ⚠️
Additional details and impacted files 
@@            Coverage Diff             @@
##           master     #793      +/-   ##
==========================================
- Coverage   82.53%   82.47%   -0.06%     
==========================================
  Files         120      122       +2     
  Lines        6802     6859      +57     
==========================================
+ Hits         5614     5657      +43     
- Misses        778      785       +7     
- Partials      410      417       +7
Flag Coverage Δ
go 82.47% <75.43%> (-0.06%) ⬇️

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DTLS 1.3 record layer encoding

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@theodorsm