config: factor Obscure and Reveal into its own package

fs/config/obscure/obscure_test.go

@@ -0,0 +1,38 @@
+package obscure
+
+import (
+	"bytes"
+	"crypto/rand"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestObscure(t *testing.T) {
+	for _, test := range []struct {
+		in   string
+		want string
+		iv   string
+	}{
+		{"", "YWFhYWFhYWFhYWFhYWFhYQ", "aaaaaaaaaaaaaaaa"},
+		{"potato", "YWFhYWFhYWFhYWFhYWFhYXMaGgIlEQ", "aaaaaaaaaaaaaaaa"},
+		{"potato", "YmJiYmJiYmJiYmJiYmJiYp3gcEWbAw", "bbbbbbbbbbbbbbbb"},
+	} {
+		cryptRand = bytes.NewBufferString(test.iv)
+		got, err := Obscure(test.in)
+		cryptRand = rand.Reader
+		assert.NoError(t, err)
+		assert.Equal(t, test.want, got)
+		recoveredIn, err := Reveal(got)
+		assert.NoError(t, err)
+		assert.Equal(t, test.in, recoveredIn, "not bidirectional")
+		// Now the Must variants
+		cryptRand = bytes.NewBufferString(test.iv)
+		got = MustObscure(test.in)
+		cryptRand = rand.Reader
+		assert.Equal(t, test.want, got)
+		recoveredIn = MustReveal(got)
+		assert.Equal(t, test.in, recoveredIn, "not bidirectional")
+
+	}
+}