rsakey: Resolve HS256 kid mismatch

Closes #83

rsakey/manager_local_hs256.go

@@ -21,7 +21,8 @@
 package rsakey
 
 import (
-	"github.com/pborman/uuid"
+	"crypto/sha256"
+	"fmt"
 )
 
 type LocalHS256Manager struct {
@@ -30,9 +31,12 @@ type LocalHS256Manager struct {
 }
 
 func NewLocalHS256Manager(key []byte) *LocalHS256Manager {
+	h := sha256.New()
+	h.Write(key)
+
 	return &LocalHS256Manager{
 		key: key,
-		kid: uuid.New(),
+		kid: fmt.Sprintf("%x", h.Sum(nil)),
 	}
 }
 

rsakey/manager_local_hs256_test.go

@@ -0,0 +1,35 @@
+/*
+ * Copyright © 2017-2018 Aeneas Rekkas <aeneas+oss@aeneas.io>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @author       Aeneas Rekkas <aeneas+oss@aeneas.io>
+ * @copyright  2017-2018 Aeneas Rekkas <aeneas+oss@aeneas.io>
+ * @license  	   Apache-2.0
+ */
+
+package rsakey
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLocalHS256Manager(t *testing.T) {
+	key := []byte("somkey")
+	m1 := NewLocalHS256Manager(key)
+	m2 := NewLocalHS256Manager(key)
+
+	assert.EqualValues(t, m1.PublicKeyID(), m2.PublicKeyID())
+}