Change time global handling (#29)

* Reverse time

* Change time handling global

* Remove debug functions

* Remove *pgp methods

crypto/time_test.go

@@ -0,0 +1,21 @@
+package crypto
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTime(t *testing.T) {
+	UpdateTime(1571072494)
+	time.Sleep(1 * time.Second)
+	diff, err := getDiff()
+
+	if err != nil {
+		t.Fatal("Expected no error when calculating time difference, got:", err)
+	}
+	assert.Exactly(t, int64(1), diff)
+
+	UpdateTime(testTime)
+}