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New() -> NewAES256GCM()
Also add missing NewChacha20poly1305
constructor in without_openssl.go.
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Maybe interesting for people following
https://github.com/rfjakob/gocryptfs/issues/452
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gocryptfs/internal/speed$ go test -bench .
goos: linux
goarch: amd64
pkg: github.com/rfjakob/gocryptfs/v2/internal/speed
cpu: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
BenchmarkStupidGCM-4 249396 4722 ns/op 867.50 MB/s
BenchmarkStupidGCMDecrypt-4 257872 4616 ns/op 887.35 MB/s
BenchmarkGoGCM-4 290952 4097 ns/op 999.83 MB/s
BenchmarkGoGCMDecrypt-4 294106 4060 ns/op 1008.84 MB/s
BenchmarkAESSIV-4 46520 25532 ns/op 160.42 MB/s
BenchmarkAESSIVDecrypt-4 46974 25478 ns/op 160.76 MB/s
BenchmarkXchacha-4 244108 4881 ns/op 839.14 MB/s
BenchmarkXchachaDecrypt-4 249658 4786 ns/op 855.86 MB/s
BenchmarkStupidXchacha-4 205339 5768 ns/op 710.11 MB/s
BenchmarkStupidXchachaDecrypt-4 204577 5836 ns/op 701.84 MB/s
BenchmarkStupidChacha-4 227510 5224 ns/op 784.06 MB/s
BenchmarkStupidChachaDecrypt-4 222787 5359 ns/op 764.34 MB/s
PASS
ok github.com/rfjakob/gocryptfs/v2/internal/speed 15.328s
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$ ./build-without-openssl.bash
internal/speed/speed.go:152:14: undefined: stupidgcm.NewXchacha20poly1305
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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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