使用go实现简易比特币区块链公链功能_Golang_

 package BLC import ( "bytes" "crypto/sha256" "time" ) //实现一个最基本的区块结构 type Block struct { TimeStamp int64 //时间戳，区块产生的时间 Heigth int64//区块高度（索引、号码）代表当前区块的高度 PreBlockHash []byte//前一个区块（父区块）的哈希 Hash []byte//当前区块的哈希 Data []byte//交易数据 } //创建一个新的区块 func NewBlock(height int64,preBlockHash []byte,Data []byte) *Block { var block Block block=Block{Heigth: height,PreBlockHash: preBlockHash,Data: Data,TimeStamp: time.Now().Unix()} block.SetHash() return &block } //计算区块哈希 func (b *Block)SetHash() { //int64转换成字节数组 //高度转换 heightBytes:=IntToHex(b.Heigth) //时间转换 timeStampBytes:=IntToHex(b.TimeStamp) //拼接所有属性进行hash blockBytes:=bytes.Join([][]byte{heightBytes,timeStampBytes,b.PreBlockHash,b.Data},[]byte{}) hash:=sha256.Sum256(blockBytes) b.Hash=hash[:] }

 package BLC type BlockChain struct { Blocks []*Block //存储有序的区块 } //初始化区块链 func CreateBlockChainWithGenesisBlock() *BlockChain { //添加创世区块 genesisBlock:=CreateGenesisBlock("the init of blockchain") return &BlockChain{[]*Block{genesisBlock}} } //添加新的区块到区块链中 func (bc *BlockChain)AddBlock(height int64,data []byte,prevBlockHash []byte){ newBlock := NewBlock(height,prevBlockHash,data) bc.Blocks=append(bc.Blocks,newBlock) }

 package BLC import ( "bytes" "crypto/sha256" "fmt" "math/big" ) //目标难度值，生成的hash前 targetBit 位为0才满足条件 const targetBit =16 //工作量证明 type ProofOfWork struct { Block *Block //对指定的区块进行验证 target *big.Int //大数据存储 } //创建新的pow对象 func NewProofOfWork(block *Block) *ProofOfWork { target:=big.NewInt(1) target=target.Lsh(target,256-targetBit) return &ProofOfWork{block,target} } //开始工作量证明 func (proofOfWork *ProofOfWork)Run() ([]byte,int64) { //数据拼接 var nonce=0 //碰撞次数 var hash [32]byte //生成的hash var hashInt big.Int //存储转换后的hash for { dataBytes:=proofOfWork.prepareData(nonce) hash=sha256.Sum256(dataBytes) hashInt.SetBytes(hash[:]) fmt.Printf("hash:\r%x",hash) //难度比较 if proofOfWork.target.Cmp(&hashInt)==1{ break } nonce++ } fmt.Printf("碰撞次数：%d\n",nonce) return hash[:],int64(nonce) } //准备数据，将区块属性拼接起来，返回字节数组 func (pow *ProofOfWork)prepareData(nonce int) []byte { data:=bytes.Join([][]byte{ pow.Block.PreBlockHash, pow.Block.Data, IntToHex(pow.Block.TimeStamp), IntToHex(pow.Block.Heigth), IntToHex(int64(nonce)), IntToHex(targetBit), },[]byte{}) return data }