Go语言常见哈希函数的使用

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myhash.go

/** * Created with IntelliJ IDEA. * User: liaojie * Date: 12-9-8 * Time: 下午3:53 * To change this template use File | Settings | File Templates. */package mainimport ( "crypto/md5" "crypto/sha1" "crypto/sha256" "crypto/sha512" "flag" //命令行选项解析器 "fmt" "hash" "io" "os")var style = flag.String("s", "sha256", "采用的哈西函数:sha1,sha256")var filename = flag.String("f", "", "需要计算散列值的文件名")func main() { flag.Parse() var hs hash.Hash switch *style { case "md5": hs = md5.New() case "sha1": hs = sha1.New() case "sha512": hs = sha512.New() default: hs = sha256.New() } if len(*filename) == 0 { filein, err := os.Open(flag.Args()[len(flag.Args())-1]) if err != nil { return } else { io.Copy(hs, filein) } } else { filein, err := os.Open(*filename) if err != nil { return } else { io.Copy(hs, filein) } } hashString := hs.Sum(nil) fmt.Printf("%x/n", hashString)}

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