add support for the ChaCha20 interop test case

[marten-seemann]

No description provided.

[codecov-io]

Codecov Report

Merging #2517 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2517   +/-   ##
=======================================
  Coverage   86.13%   86.13%           
=======================================
  Files         122      122           
  Lines        9533     9533           
=======================================
  Hits         8211     8211           
  Misses        984      984           
  Partials      338      338           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6d66eac...9c501a0. Read the comment docs.

[rogers0]

@marten-seemann thanks for the patch!

I'm trying to packaging this project into Debian.
I also meet this issue, but after your patch, it seems still fails.

  using TLS_CHACHA20_POLY1305_SHA256
  /build/golang-github-lucas-clemente-quic-go-0.15.6/obj-x86_64-linux-gnu/src/github.com/lucas-clemente/quic-go/internal/handshak
e/aead_test.go:20
    header encryption
    /build/golang-github-lucas-clemente-quic-go-0.15.6/obj-x86_64-linux-gnu/src/github.com/lucas-clemente/quic-go/internal/handsh
ake/aead_test.go:62
      encrypts and encrypts the header, for a 0xfff..fff sample [It]
      /build/golang-github-lucas-clemente-quic-go-0.15.6/obj-x86_64-linux-gnu/src/github.com/lucas-clemente/quic-go/internal/hand
shake/aead_test.go:83

      Test Panicked
      chacha20: counter overflow
      /build/golang-github-lucas-clemente-quic-go-0.15.6/obj-x86_64-linux-gnu/src/golang.org/x/crypto/chacha20/chacha_generic.go:
206

[marten-seemann]

@rogers0 This is unrelated to this PR. It should have been fixed by #2508, can you please make sure your dependencies are up to date? Especially golang.org/x/crypto. If the problem then still exists, please open a new issue.

[rogers0]

@marten-seemann Thanks for your information!
Yes, all tests get passed after upgrading golang.org/x/crypto