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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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The rewritten openssl backend does not support this flag anymore,
and it was inherently dangerour. Drop it (ignored for compatibility)
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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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No need to have it exported.
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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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