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We used to panic in this case because it is useless.
But Go stdlib supports it, so we should as well.
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Verifies that we don't corrupt data when called concurrently.
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gocryptfs/internal/stupidgcm$ go test -bench .
goos: linux
goarch: amd64
pkg: github.com/rfjakob/gocryptfs/v2/internal/stupidgcm
cpu: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
BenchmarkCCall-4 15864030 78.60 ns/op
PASS
ok github.com/rfjakob/gocryptfs/v2/internal/stupidgcm 1.898s
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Nice deduplication and brings the GCM decrypt speed up to par.
internal/speed$ benchstat old new
name old time/op new time/op delta
StupidGCM-4 4.71µs ± 0% 4.66µs ± 0% -0.99% (p=0.008 n=5+5)
StupidGCMDecrypt-4 5.77µs ± 1% 4.51µs ± 0% -21.80% (p=0.008 n=5+5)
name old speed new speed delta
StupidGCM-4 870MB/s ± 0% 879MB/s ± 0% +1.01% (p=0.008 n=5+5)
StupidGCMDecrypt-4 710MB/s ± 1% 908MB/s ± 0% +27.87% (p=0.008 n=5+5)
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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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