app: restructure and start building p15 output

pkg/tools/asn1obj/sequence.go

@@ -0,0 +1,26 @@
+package asn1obj
+
+import "encoding/asn1"
+
+// Sequence returns an ASN.1 SEQUENCE with the specified content
+func Sequence(content [][]byte) []byte {
+	val := []byte{}
+	for i := range content {
+		val = append(val, content[i]...)
+	}
+
+	raw := asn1.RawValue{
+		Class:      asn1.ClassUniversal,
+		Tag:        asn1.TagSequence,
+		IsCompound: true,
+		Bytes:      val,
+	}
+
+	// should never error
+	asn1result, err := asn1.Marshal(raw)
+	if err != nil {
+		panic(err)
+	}
+
+	return asn1result
+}