golang标准库crc32的使用样例

package main

import (
	"fmt"
	"hash/crc32"
)

func main() {

	originalData := []byte("hello world")
	i3eCheckSum1 := crc32.Checksum(originalData, crc32.IEEETable)
	i3eCheckSum2 := crc32.ChecksumIEEE(originalData)
	fmt.Println(i3eCheckSum1, i3eCheckSum2)

	//MakeTable使用方式
	caTable := crc32.MakeTable(crc32.Castagnoli)
	kmTable := crc32.MakeTable(crc32.Koopman)
	caCheckSum := crc32.Checksum(originalData, caTable)
	kmCheckSum := crc32.Checksum(originalData, kmTable)
	fmt.Println("castagnoli checksum is: ", caCheckSum)
	fmt.Println("koopman checksum is: ", kmCheckSum)

	caHash := crc32.New(caTable)
	_, err := caHash.Write(originalData)
	if err != nil {
		panic(err)
	}
	caCheckSum1 := caHash.Sum32()
	fmt.Println("castagnoli checksum is: ", caCheckSum1)

	i3eHash := crc32.NewIEEE()
	//此处可以一直追加数据
	_, err = i3eHash.Write(originalData)
	if err != nil {
		panic(err)
	}
	i3eCheckSum3 := i3eHash.Sum32()
	fmt.Println("ieee checksum is: ", i3eCheckSum3)

	newData := []byte("你好，世界")
	//采用update追加数据(适用于计算之后再追加数据的场景)
	newCheckSum1 := crc32.Update(i3eCheckSum1, crc32.IEEETable, newData)
	//直接追加数据之后再计算
	newCheckSum2 := crc32.ChecksumIEEE(append(originalData, newData...))
	fmt.Println(newCheckSum1, newCheckSum2)

}