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authorJakob Unterwurzacher2020-02-15 17:21:30 +0100
committerJakob Unterwurzacher2020-02-15 17:21:30 +0100
commitd5ce340c02601992cc9dab1bd7d3c2d95d81155e (patch)
treee709cea1677b2d9dff80ce83d5086aaaebf03c49 /internal/stupidgcm/prefer.go
parent9aeb2a3df68539ad3a44283b9b94e1b28f011941 (diff)
merge prefer_openssl package into stupidgcm
Now that I have discovered golang.org/x/sys/cpu and that Go versions below 1.6 are uncommon, there was not much useful code left in prefer_openssl. Merge the remains into stupidgcm.
Diffstat (limited to 'internal/stupidgcm/prefer.go')
-rw-r--r--internal/stupidgcm/prefer.go26
1 files changed, 26 insertions, 0 deletions
diff --git a/internal/stupidgcm/prefer.go b/internal/stupidgcm/prefer.go
new file mode 100644
index 0000000..a08d154
--- /dev/null
+++ b/internal/stupidgcm/prefer.go
@@ -0,0 +1,26 @@
+package stupidgcm
+
+import (
+ "golang.org/x/sys/cpu"
+)
+
+// PreferOpenSSL tells us if OpenSSL is faster than Go GCM on this machine.
+//
+// Go GCM is only faster if the CPU:
+//
+// 1) Is X86
+// 2) Has AES instructions
+// 3) Go is v1.6 or higher
+//
+// See https://github.com/rfjakob/gocryptfs/wiki/CPU-Benchmarks
+// for benchmarks.
+func PreferOpenSSL() bool {
+ if BuiltWithoutOpenssl {
+ return false
+ }
+ // Safe to call on other architectures - will just read false.
+ if cpu.X86.HasAES {
+ return false
+ }
+ return true
+}