Fix panic on null (but present) header key

square · Jun 26, 2018 · 6954638 · 6954638
1 parent 8cff744
commit 6954638
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Showing 2 changed files with 7 additions and 1 deletion.
diff --git a/jwe_test.go b/jwe_test.go
@@ -541,3 +541,9 @@ func TestSampleJose4jJWEMessagesECDH(t *testing.T) {
 		}
 	}
 }
+
+func TestJWEWithNullAlg(t *testing.T) {
+	// {"alg":null,"enc":"A128GCM"}
+	serialized := `{"protected":"eyJhbGciOm51bGwsImVuYyI6IkExMjhHQ00ifQ"}`
+	ParseEncrypted(serialized)
+}
diff --git a/shared.go b/shared.go
@@ -206,7 +206,7 @@ func (parsed rawHeader) set(k HeaderKey, v interface{}) error {
 // getString gets a string from the raw JSON, defaulting to "".
 func (parsed rawHeader) getString(k HeaderKey) string {
 	v, ok := parsed[k]
-	if !ok {
+	if !ok || v == nil {
 		return ""
 	}
 	var s string