without_openssl: support compiling completely without openssl

Build helper script: build-without-openssl.bash

3 files changed, 15 insertions, 1 deletions

diff --git a/internal/prefer_openssl/prefer.go b/internal/prefer_openssl/prefer.go
index 0afe7d5..e06f0d5 100644
--- a/internal/prefer_openssl/prefer.go
+++ b/internal/prefer_openssl/prefer.go
@@ -11,7 +11,7 @@ import (
 )
 
 // filePreferOpenSSL tells us if OpenSSL is faster than Go GCM on this machine.
-// Go GCM is fastern when the CPU has AES instructions and Go is v1.6 or higher.
+// Go GCM is faster when the CPU has AES instructions and Go is v1.6 or higher.
 //
 // See https://github.com/rfjakob/gocryptfs/issues/23#issuecomment-218286502
 // for benchmarks.
diff --git a/internal/prefer_openssl/prefer_go1.5.go b/internal/prefer_openssl/prefer_go1.5.go
index 51a07ab..7095314 100644
--- a/internal/prefer_openssl/prefer_go1.5.go
+++ b/internal/prefer_openssl/prefer_go1.5.go
@@ -3,7 +3,14 @@
 
 package prefer_openssl
 
+import (
+	"github.com/rfjakob/gocryptfs/internal/stupidgcm"
+)
+
 func PreferOpenSSL() bool {
+	if stupidgcm.BuiltWithoutOpenssl {
+		return false
+	}
 	// OpenSSL is always faster than Go GCM on old Go versions or on anything
 	// other than amd64
 	return true
diff --git a/internal/prefer_openssl/prefer_go1.6.go b/internal/prefer_openssl/prefer_go1.6.go
index 898db0c..a5a67fb 100644
--- a/internal/prefer_openssl/prefer_go1.6.go
+++ b/internal/prefer_openssl/prefer_go1.6.go
@@ -3,6 +3,10 @@
 
 package prefer_openssl
 
+import (
+	"github.com/rfjakob/gocryptfs/internal/stupidgcm"
+)
+
 // PreferOpenSSL tells us if OpenSSL is faster than Go GCM on this machine.
 // Go GCM is faster when the CPU has AES instructions and Go is v1.6 or higher
 // on amd64.
@@ -10,5 +14,8 @@ package prefer_openssl
 // See https://github.com/rfjakob/gocryptfs/issues/23#issuecomment-218286502
 // for benchmarks.
 func PreferOpenSSL() bool {
+	if stupidgcm.BuiltWithoutOpenssl {
+		return false
+	}
 	return filePreferOpenSSL("/proc/cpuinfo")
 }