Initial signer rewrite in Go

datastructures/common.go

@@ -0,0 +1,28 @@
+package datastructures
+
+import "encoding/binary"
+
+type Action uint8
+
+const ActionNul = Action(0)
+
+func encode24BitLength(data []byte) []byte {
+	lengthBytes := make([]byte, 4)
+	binary.BigEndian.PutUint32(lengthBytes, uint32(len(data)))
+	return lengthBytes[1:]
+}
+
+// calculate length from 24 bits of data in network byte order
+func decode24BitLength(bytes []byte) int {
+	return int(binary.BigEndian.Uint32([]byte{0x0, bytes[0], bytes[1], bytes[2]}))
+}
+
+func CalculateXorCheckSum(byteBlocks [][]byte) byte {
+	var result byte = 0x0
+	for _, byteBlock := range byteBlocks {
+		for _, b := range byteBlock {
+			result ^= b
+		}
+	}
+	return result
+}