56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package main
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import (
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"crypto/sha256"
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"fmt"
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"log"
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"strconv"
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"time"
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)
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// Block keeps block headers
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type Block struct {
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Timestamp int64
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Data []byte
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PrevBlock []byte
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hash []byte
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}
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// SetHash calculates and sets block hash
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func (b *Block) SetHash() {
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h := sha256.New()
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timestamp := []byte(strconv.FormatInt(b.Timestamp, 10))
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var data []byte
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data = append(data, b.PrevBlock...)
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data = append(data, b.Data...)
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data = append(data, timestamp...)
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_, err := h.Write(data)
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if err != nil {
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log.Panic(err)
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}
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b.hash = h.Sum(nil)
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}
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// NewBlock creates and returns Block
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func NewBlock(data string, prevBlock []byte) *Block {
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block := &Block{time.Now().Unix(), []byte(data), prevBlock, []byte("")}
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block.SetHash()
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return block
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}
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// NewGenesisBlock creates and returns genesis Block
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func NewGenesisBlock() *Block {
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return NewBlock("Genesis Block", []byte("0"))
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}
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func main() {
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gb := NewGenesisBlock()
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b1 := NewBlock("Send 1 BTC to Ivan", gb.hash)
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fmt.Printf("%s\n", gb.Data)
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fmt.Printf("%x\n", gb.hash)
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fmt.Printf("%s\n", b1.Data)
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fmt.Printf("%x\n", b1.hash)
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}
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