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Implementation copied from
https://github.com/golang/crypto/blob/32db794688a5a24a23a43f2a984cecd5b3d8da58/chacha20poly1305/xchacha20poly1305.go
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Follow what golang.org/x/crypto/chacha20poly1305 does
for easier integration in the next commit.
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After looking at the cover profile, this was the only untested
code except panic cases.
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Deduplicate the cipher setup that was identical
for all tests for each cipher.
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Pull the code shared between chacha and gcm into
generic functions.
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