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AEGIS is a new family of authenticated encryption algorithms that offers
stronger security, higher usage limits, and better performance than AES-GCM.
This pull request adds support for a new `-aegis` command-line flag, allowing
AEGIS-128X2 to be used as an alternative to AES-GCM on CPUs with AES acceleration.
It also introduces the ability to use ciphers with different key sizes.
More information on AEGIS is available here:
- https://cfrg.github.io/draft-irtf-cfrg-aegis-aead/draft-irtf-cfrg-aegis-aead.html
- https://github.com/cfrg/draft-irtf-cfrg-aegis-aead
gocryptfs -speed speed on Apple M1:
AES-GCM-256-OpenSSL 3718.79 MB/s
AES-GCM-256-Go 5083.43 MB/s (selected in auto mode)
AES-SIV-512-Go 625.20 MB/s
XChaCha20-Poly1305-OpenSSL 1358.63 MB/s (selected in auto mode)
XChaCha20-Poly1305-Go 832.11 MB/s
Aegis128X2-Go 11818.73 MB/s
gocryptfs -speed speed on AMD Zen 4:
AES-GCM-256-OpenSSL 5215.86 MB/s
AES-GCM-256-Go 6918.01 MB/s (selected in auto mode)
AES-SIV-512-Go 449.61 MB/s
XChaCha20-Poly1305-OpenSSL 2643.48 MB/s
XChaCha20-Poly1305-Go 3727.46 MB/s (selected in auto mode)
Aegis128X2-Go 28109.92 MB/s
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We missed some "// +build" lines
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Go has a high overhead for each C call, so batch
all openssl operations in the new C function chacha20poly1305_seal.
Benchmark results:
internal/speed$ go test -bench BenchmarkStupidXchacha -count 10 > old.txt
internal/speed$ go test -bench BenchmarkStupidXchacha -count 10 > new.txt
internal/speed$ benchstat old.txt new.txt
name old time/op new time/op delta
StupidXchacha-4 8.79µs ± 1% 7.25µs ± 1% -17.54% (p=0.000 n=10+10)
name old speed new speed delta
StupidXchacha-4 466MB/s ± 1% 565MB/s ± 1% +21.27% (p=0.000 n=10+10)
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