Add password utils

internal/util/password.go

@@ -0,0 +1,34 @@
+// Copyright 2019 Sorint.lab
+//
+// 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.
+
+package util
+
+import (
+	"golang.org/x/crypto/bcrypt"
+)
+
+func PasswordHash(password string) (string, error) {
+	passwordHash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	return string(passwordHash), err
+}
+
+func CompareHashAndPassword(passwordHash, password string) (bool, error) {
+	if err := bcrypt.CompareHashAndPassword([]byte(passwordHash), []byte(password)); err != nil {
+		if err == bcrypt.ErrMismatchedHashAndPassword {
+			return false, nil
+		}
+		return false, err
+	}
+	return true, nil
+}