From 6325760d1647b8e9cdfd8aae57dd711501b77991 Mon Sep 17 00:00:00 2001
From: OsauravO <saurav1hasyo@gmail.com>
Date: Thu, 25 Apr 2024 01:06:58 +0530
Subject: [PATCH] encoding and byteArray conversion

---
 main.go | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 91 insertions(+), 9 deletions(-)

diff --git a/main.go b/main.go
index 087e3d2..6feee88 100644
--- a/main.go
+++ b/main.go
@@ -10,6 +10,30 @@ import (
 	"time"
 
 )
+func Uint16ToBytes(n uint16) []byte {
+	bytes := make([]byte, 2)
+	binary.LittleEndian.PutUint16(bytes, n)
+	return bytes
+}
+func Uint32ToBytes(n uint32) []byte {
+	bytes := make([]byte, 4)
+	binary.LittleEndian.PutUint32(bytes, n)
+	return bytes
+}
+
+func Uint64ToBytes(n uint64) []byte {
+	bytes := make([]byte, 8)
+	binary.LittleEndian.PutUint64(bytes, n)
+	return bytes
+}
+
+func ReverseBytes(data []byte) []byte {
+	length := len(data)
+	for i := 0; i < length/2; i++ {
+		data[i], data[length-i-1] = data[length-i-1], data[i]
+	}
+	return data
+}
 
  var blockHeader = BlockHeader{
 	Version:       7,
@@ -40,7 +64,9 @@ type Input struct {
 	Prevout      Prevout  `json:"prevout"`
 	Scriptsig    string   `json:"scriptsig"`
 	ScriptsigAsm string   `json:"scriptsig_asm"`
+	Witness      []string `json:"witness"`
 	IsCoinbase   bool     `json:"is_coinbase"`
+	Sequence     uint32   `json:"sequence"`
 }
 
 type Prevout struct {
@@ -70,6 +96,15 @@ type TxWeight struct {
 	Weight      int `json:"weight"`       // Total weight in weight units
 }
 
+type MerkleNode struct {
+	Left  *MerkleNode
+	Data  []byte
+	Right *MerkleNode
+}
+
+type MerkleTree struct {
+	MerkleRoot *MerkleNode
+}
 
 // TargetValue represents the target value for proof-of-work mining
 const TargetValue string = "0000ffff00000000000000000000000000000000000000000000000000000000"
@@ -108,20 +143,67 @@ func arrayVector(a, b []byte) int {
 
 // ProofOfWork performs the proof-of-work mining process for a given block header
 func ProofOfWork(blockHeader *BlockHeader) bool {
-   targetBytes, _ := hex.DecodeString(TargetValue)
+	targetBytes, _ := hex.DecodeString(TargetValue)
 
-   for {
-   	serzHeader := SerializeBlockHeader(blockHeader)
-   	hash := ReverseBytes(To_sha(To_sha(serzHeader)))
+	for {
+		serializedHeader := SerializeBlockHeader(blockHeader)
+		hash := ReverseBytes(To_sha(To_sha(serializedHeader)))
+ 
+		if checkByteArray(hash, targetBytes) == -1 {
+			return true
+		}
+ 
+		if blockHeader.Nonce < 0 || blockHeader.Nonce > 0xffffffff {
+			return false
+		}
+ 
+		blockHeader.Nonce++
+	}
+}
 
-   	if blockHeader.Nonce < 0 || blockHeader.Nonce > 0xffffffff {
-   		return false
-   	}
+func ExtractHexFromScriptpubkeyAsm(str []string) string {
+	for i := 0; i < len(str); i++ {
+		if str[i] == "OP_PUSHBYTES_20" || str[i] == "OP_PUSHBYTES_32" {
+			return str[i+1]
+		}
+	}
+	return ""
+}
 
-   	blockHeader.Nonce++
-   }
+func Base58Encode(input []byte) []byte {
+	var encoded string = base58.Encode(input)
+	return []byte(encoded)
+}
+
+func To_sha(data []byte) []byte {
+	hash := sha256.Sum256(data)
+	return hash[:]
+}
+
+func JsonData(filename string) (string, error) {
+	data, err := os.ReadFile(filename)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
 }
 
+func Handle(err error) {
+	if err != nil {
+		fmt.Println(err)
+	}
+}
+
+func CheckSegWit(tx *Transaction) bool {
+	for _, vin := range tx.Vin {
+		if len(vin.Witness) > 0 {
+			return true
+		}
+	}
+	return false
+}
+
+
 func CreateCoinbase(netReward uint64) *Transaction {
 	witnessCommitment := CreateWitnessMerkle()
 	coinbaseTx := Transaction{