internal/subtle: rename to internal/alias
This avoids an import conflict in code that needs to import
crypto/subtle as well.
CL 424194 does the same for the main repo.
Change-Id: Ic54cb62bbfdcf5c2cb6f15ac47075ee1c41981ad
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/424175
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
diff --git a/internal/alias/alias_test.go b/internal/alias/alias_test.go
new file mode 100644
index 0000000..a68fb33
--- /dev/null
+++ b/internal/alias/alias_test.go
@@ -0,0 +1,46 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package alias
+
+import "testing"
+
+var a, b [100]byte
+
+var aliasingTests = []struct {
+ x, y []byte
+ anyOverlap, inexactOverlap bool
+}{
+ {a[:], b[:], false, false},
+ {a[:], b[:0], false, false},
+ {a[:], b[:50], false, false},
+ {a[40:50], a[50:60], false, false},
+ {a[40:50], a[60:70], false, false},
+ {a[:51], a[50:], true, true},
+ {a[:], a[:], true, false},
+ {a[:50], a[:60], true, false},
+ {a[:], nil, false, false},
+ {nil, nil, false, false},
+ {a[:], a[:0], false, false},
+ {a[:10], a[:10:20], true, false},
+ {a[:10], a[5:10:20], true, true},
+}
+
+func testAliasing(t *testing.T, i int, x, y []byte, anyOverlap, inexactOverlap bool) {
+ any := AnyOverlap(x, y)
+ if any != anyOverlap {
+ t.Errorf("%d: wrong AnyOverlap result, expected %v, got %v", i, anyOverlap, any)
+ }
+ inexact := InexactOverlap(x, y)
+ if inexact != inexactOverlap {
+ t.Errorf("%d: wrong InexactOverlap result, expected %v, got %v", i, inexactOverlap, any)
+ }
+}
+
+func TestAliasing(t *testing.T) {
+ for i, tt := range aliasingTests {
+ testAliasing(t, i, tt.x, tt.y, tt.anyOverlap, tt.inexactOverlap)
+ testAliasing(t, i, tt.y, tt.x, tt.anyOverlap, tt.inexactOverlap)
+ }
+}
