Go语言常见哈希函数的使用
myhash.go
/**
*CreatedwithIntelliJIDEA.
*User:liaojie
*Date:12-9-8
*Time:下午3:53
*TochangethistemplateuseFile|Settings|FileTemplates.
*/
packagemain
import(
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"flag"//命令行选项解析器
"fmt"
"hash"
"io"
"os"
)
varstyle=flag.String("s","sha256","采用的哈西函数:sha1,sha256")
varfilename=flag.String("f","","需要计算散列值的文件名")
funcmain(){
flag.Parse()
varhshash.Hash
switch*style{
case"md5":
hs=md5.New()
case"sha1":
hs=sha1.New()
case"sha512":
hs=sha512.New()
default:
hs=sha256.New()
}
iflen(*filename)==0{
filein,err:=os.Open(flag.Args()[len(flag.Args())-1])
iferr!=nil{
return
}else{
io.Copy(hs,filein)
}
}else{
filein,err:=os.Open(*filename)
iferr!=nil{
return
}else{
io.Copy(hs,filein)
}
}
hashString:=hs.Sum(nil)
fmt.Printf("%x\n",hashString)
}
以上所述就是本文的全部内容了，希望大家能够喜欢。