Encrypt passwords in DB (#1187)

* Encode/Encrypt passwords in DB

* Only decrypts passwords if it is necessary

* Add tests for encryption functions

persistence/user_repository_test.go

@@ -36,13 +36,18 @@ var _ = Describe("UserRepository", func() {
 			actual, err := repo.Get("123")
 			Expect(err).ToNot(HaveOccurred())
 			Expect(actual.Name).To(Equal("Admin"))
-			Expect(actual.Password).To(Equal("wordpass"))
 		})
 		It("find the user by case-insensitive username", func() {
 			actual, err := repo.FindByUsername("aDmIn")
 			Expect(err).ToNot(HaveOccurred())
 			Expect(actual.Name).To(Equal("Admin"))
 		})
+		It("find the user by username and decrypts the password", func() {
+			actual, err := repo.FindByUsernameWithPassword("aDmIn")
+			Expect(err).ToNot(HaveOccurred())
+			Expect(actual.Name).To(Equal("Admin"))
+			Expect(actual.Password).To(Equal("wordpass"))
+		})
 	})
 
 	Describe("validatePasswordChange", func() {