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-rw-r--r--cryptfs/gcm_go1.4.go22
1 files changed, 22 insertions, 0 deletions
diff --git a/cryptfs/gcm_go1.4.go b/cryptfs/gcm_go1.4.go
new file mode 100644
index 0000000..0a2ff49
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+++ b/cryptfs/gcm_go1.4.go
@@ -0,0 +1,22 @@
+// +build !go1.5
+// = go 1.4 or lower
+
+package cryptfs
+
+import (
+ "crypto/cipher"
+ "fmt"
+)
+
+// goGCMWrapper - This wrapper makes sure gocryptfs can be compiled on Go
+// versions 1.4 and lower that lack NewGCMWithNonceSize().
+// 128 bit GCM IVs will not work when using built-in Go crypto, obviously, when
+// compiled on 1.4.
+func goGCMWrapper(bc cipher.Block, nonceSize int) (cipher.AEAD, error) {
+ if nonceSize != 12 {
+ Warn.Printf("128 bit GCM IVs are not supported by Go 1.4 and lower.")
+ Warn.Printf("Please use openssl crypto or recompile using a newer Go runtime.")
+ return nil, fmt.Errorf("128 bit GCM IVs are not supported by Go 1.4 and lower")
+ }
+ return cipher.NewGCM(bc)
+}