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stupidgcm: add CpuHasAES()

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Makes the code clearer, and will be used in the next commit.
This commit is contained in:
Jakob Unterwurzacher 2021-09-14 18:47:07 +02:00
parent 52b0444985
commit 61e37b2439
1 changed files with 18 additions and 9 deletions
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27
internal/stupidgcm/prefer.go
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@ -21,17 +21,11 @@ func PreferOpenSSLAES256GCM() bool {
if BuiltWithoutOpenssl {
return false
}
// Safe to call on other architectures - will just read false.
if cpu.X86.HasAES || cpu.ARM64.HasAES {
// Go stdlib is probably faster
// If the CPU has AES acceleration, Go stdlib is faster
if CpuHasAES() {
return false
}
// On the Apple M1, Go stdlib is faster than OpenSSL, despite cpu.ARM64.HasAES
// reading false: https://github.com/rfjakob/gocryptfs/issues/556#issuecomment-848079309
if runtime.GOOS == "darwin" && runtime.GOARCH == "arm64" {
return false
}
// OpenSSL is probably faster
// Otherwise OpenSSL is probably faster
return true
}
@ -49,3 +43,18 @@ func PreferOpenSSLXchacha20poly1305() bool {
// On arm64 and arm, OpenSSL is faster. Probably everwhere else too.
return true
}
// CpuHasAES tells you if the CPU we are running has AES acceleration that is
// usable by the Go crypto library.
func CpuHasAES() bool {
// Safe to call on other architectures - will just read false.
if cpu.X86.HasAES || cpu.ARM64.HasAES {
return true
}
// On the Apple M1, the CPU has AES acceleration, despite cpu.ARM64.HasAES
// reading false: https://github.com/rfjakob/gocryptfs/issues/556#issuecomment-848079309
if runtime.GOOS == "darwin" && runtime.GOARCH == "arm64" {
return true
}
return false
}