cryptutil: move to pkg dir, add token generator (#1029)

* cryptutil: move to pkg dir, add token generator

* add gitignored files

* add tests

pkg/cryptutil/helpers_test.go

@@ -0,0 +1,55 @@
+package cryptutil
+
+import (
+	"encoding/base64"
+	"testing"
+)
+
+func TestGenerateRandomString(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name string
+		c    int
+		want int
+	}{
+		{"simple", 32, 32},
+		{"zero", 0, 0},
+		{"negative", -1, 32},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := NewRandomStringN(tt.c)
+			b, err := base64.StdEncoding.DecodeString(o)
+			if err != nil {
+				t.Error(err)
+			}
+			got := len(b)
+			if got != tt.want {
+				t.Errorf("NewRandomStringN() = %d, want %d", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestNewBase64Key(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name string
+		want int
+	}{
+		{"simple", 32},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := NewBase64Key()
+			b, err := base64.StdEncoding.DecodeString(o)
+			if err != nil {
+				t.Error(err)
+			}
+			got := len(b)
+			if got != tt.want {
+				t.Errorf("NewBase64Key() = %d, want %d", got, tt.want)
+			}
+		})
+	}
+}