stupidgcm: stupidChacha20poly1305: use byte array for key

Follow what golang.org/x/crypto/chacha20poly1305 does
for easier integration in the next commit.

1 files changed, 11 insertions, 6 deletions

diff --git a/internal/stupidgcm/common_test.go b/internal/stupidgcm/common_test.go
index ded6273..cf555b0 100644
--- a/internal/stupidgcm/common_test.go
+++ b/internal/stupidgcm/common_test.go
@@ -167,20 +167,25 @@ type Wiper interface {
 }
 
 func testWipe(t *testing.T, c cipher.AEAD) {
-	var key []byte
 	switch c2 := c.(type) {
 	case *StupidGCM:
 		c2.Wipe()
-		key = c2.key
+		if c2.key != nil {
+			t.Fatal("key is not nil")
+		}
 	case *stupidChacha20poly1305:
 		c2.Wipe()
-		key = c2.key
+		if !c2.wiped {
+			t.Error("c2.wiped is not set")
+		}
+		for _, v := range c2.key {
+			if v != 0 {
+				t.Fatal("c2.key is not zeroed")
+			}
+		}
 	default:
 		t.Fatalf("BUG: unhandled type %t", c2)
 	}
-	if key != nil {
-		t.Fatal("key is not nil")
-	}
 }
 
 // Get "n" random bytes from /dev/urandom or panic