app: restructure and start building p15 output

pkg/tools/asn1obj/octetstring.go

@@ -0,0 +1,23 @@
+package asn1obj
+
+import (
+	"encoding/asn1"
+)
+
+// OctetString returns an OCTET STRING of the content
+func OctetString(content []byte) []byte {
+	raw := asn1.RawValue{
+		Class:      asn1.ClassUniversal,
+		Tag:        asn1.TagOctetString,
+		IsCompound: false,
+		Bytes:      content,
+	}
+
+	// should never error
+	asn1result, err := asn1.Marshal(raw)
+	if err != nil {
+		panic(err)
+	}
+
+	return asn1result
+}