From 49b597f07c07bde6a2feb1f32f02fcaf34daf365 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Wed, 11 May 2016 23:36:57 +0200
Subject: prefer_openssl: autodetect whether to use OpenSSL or Go GCM

Go GCM is faster than OpenSSL if the CPU has AES instructions
and you are running Go 1.6+.

The "-openssl" option now defaults to "auto".

"gocryptfs -debug -version" displays the result of the autodetection.

See https://github.com/rfjakob/gocryptfs/issues/23 for details and
benchmarks.
---
 internal/prefer_openssl/prefer_go1.5.go | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 internal/prefer_openssl/prefer_go1.5.go

(limited to 'internal/prefer_openssl/prefer_go1.5.go')

diff --git a/internal/prefer_openssl/prefer_go1.5.go b/internal/prefer_openssl/prefer_go1.5.go
new file mode 100644
index 0000000..4b681e7
--- /dev/null
+++ b/internal/prefer_openssl/prefer_go1.5.go
@@ -0,0 +1,9 @@
+// +build !go1.6
+// = go 1.5 or lower
+
+package prefer_openssl
+
+func PreferOpenSSL() bool {
+	// OpenSSL is always faster than Go GCM on old Go versions.
+	return true
+}
-- 
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