Drop Go 1.4 compatability code everywhere

Yields a nice reduction in code size.

6 files changed, 5 insertions, 88 deletions

diff --git a/internal/cryptocore/cryptocore.go b/internal/cryptocore/cryptocore.go
index fea0c94..735c409 100644
--- a/internal/cryptocore/cryptocore.go
+++ b/internal/cryptocore/cryptocore.go
@@ -74,7 +74,7 @@ func New(key []byte, aeadType AEADTypeEnum, IVBitLen int) *CryptoCore {
 		}
 		aeadCipher = stupidgcm.New(key)
 	case BackendGoGCM:
-		aeadCipher, err = goGCMWrapper(blockCipher, IVLen)
+		aeadCipher, err = cipher.NewGCMWithNonceSize(blockCipher, IVLen)
 	case BackendAESSIV:
 		if IVLen != 16 {
 			// SIV supports any nonce size, but we only use 16.
diff --git a/internal/cryptocore/cryptocore_go1.4_test.go b/internal/cryptocore/cryptocore_go1.4_test.go
deleted file mode 100644
index 14e1e03..0000000
--- a/internal/cryptocore/cryptocore_go1.4_test.go
+++ /dev/null
@@ -1,20 +0,0 @@
-// +build !go1.5
-// = go 1.4 or lower
-
-package cryptocore
-
-import (
-	"testing"
-)
-
-// Native Go crypto with 128-bit IVs is only supported on Go 1.5 and up,
-// this should panic.
-func TestCryptoCoreNewGo14(t *testing.T) {
-	defer func() {
-		if r := recover(); r == nil {
-			t.Errorf("The code did not panic")
-		}
-	}()
-	key := make([]byte, 32)
-	New(key, BackendGoGCM, 128)
-}
diff --git a/internal/cryptocore/cryptocore_go1.5_test.go b/internal/cryptocore/cryptocore_go1.5_test.go
deleted file mode 100644
index f9d38e9..0000000
--- a/internal/cryptocore/cryptocore_go1.5_test.go
+++ /dev/null
@@ -1,16 +0,0 @@
-// +build go1.5
-// = go 1.5 or higher
-
-package cryptocore
-
-import (
-	"testing"
-)
-
-func TestCryptoCoreNewGo15(t *testing.T) {
-	key := make([]byte, 32)
-	c := New(key, BackendGoGCM, 128)
-	if c.IVLen != 16 {
-		t.Fail()
-	}
-}
diff --git a/internal/cryptocore/cryptocore_test.go b/internal/cryptocore/cryptocore_test.go
index c54eac9..252c311 100644
--- a/internal/cryptocore/cryptocore_test.go
+++ b/internal/cryptocore/cryptocore_test.go
@@ -16,7 +16,10 @@ func TestCryptoCoreNew(t *testing.T) {
 	if c.IVLen != 12 {
 		t.Fail()
 	}
-	// "New(key, BackendGoGCM, 128)" is tested for Go 1.4 and 1.5+ separately
+	c = New(key, BackendGoGCM, 128)
+	if c.IVLen != 16 {
+		t.Fail()
+	}
 }
 
 // "New" should panic on any key not 32 bytes long
diff --git a/internal/cryptocore/gcm_go1.4.go b/internal/cryptocore/gcm_go1.4.go
deleted file mode 100644
index c1aa488..0000000
--- a/internal/cryptocore/gcm_go1.4.go
+++ /dev/null
@@ -1,29 +0,0 @@
-// +build !go1.5
-// = go 1.4 or lower
-
-package cryptocore
-
-import (
-	"crypto/cipher"
-	"fmt"
-
-	"github.com/rfjakob/gocryptfs/internal/tlog"
-)
-
-const (
-	// HaveModernGoGCM indicates if Go GCM supports 128-bit nonces
-	HaveModernGoGCM = false
-)
-
-// 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 {
-		tlog.Warn.Printf("128 bit GCM IVs are not supported by Go 1.4 and lower.")
-		tlog.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)
-}
diff --git a/internal/cryptocore/gcm_go1.5.go b/internal/cryptocore/gcm_go1.5.go
deleted file mode 100644
index 3c38357..0000000
--- a/internal/cryptocore/gcm_go1.5.go
+++ /dev/null
@@ -1,21 +0,0 @@
-// +build go1.5
-// = go 1.5 or higher
-
-package cryptocore
-
-import (
-	"crypto/cipher"
-)
-
-const (
-	// HaveModernGoGCM indicates if Go GCM supports 128-bit nonces
-	HaveModernGoGCM = true
-)
-
-// 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) {
-	return cipher.NewGCMWithNonceSize(bc, nonceSize)
-}