Go语言的哈希函数

Go提供了MD5、SHA-1等几个哈希函数：

import (
    "crypto/md5"
    "crypto/sha1"
    "fmt"
)
func main() {
    TestString := "Hi, pandaman!"
    Md5Inst := md5.New()
    Md5Inst.Write([]byte(TestString))
    Result := Md5Inst.Sum([]byte(""))
    fmt.Printf("%x\n\n", Result)
    ShalInst := sha1.New()
    ShalInst.Write([]byte(TestString))
    Result = ShalInst.Sum([]byte(""))
    fmt.Printf("%x\n\n", Result)
}

输出结果

b08dad36bde5f406bdcfb32bfcadbb6b 
00aa75c24404f4c81583b99b50534879adc3985d

对文件内容计算SHA1

package main
import (
    "crypto/md5"
    "crypto/sha1"
    "fmt"
    "io"
    "os"
)
func main() {
    TestFile := "123.txt"
    infile, inerr := os.Open(TestFile)
    if inerr == nil {
        md5h := md5.New()
        io.Copy(md5h, infile)
        fmt.Printf("%x %s\n", md5h.Sum([]byte("")), TestFile)
        sha1h := sha1.New()
        io.Copy(sha1h, infile)
        fmt.Printf("%x %s\n", sha1h.Sum([]byte("")), TestFile)
    } else {
        fmt.Println(inerr)
        os.Exit(1)
    }
}