output

:$ cat /tmp/main.go && go build -o /tmp/sha1 /tmp/main.go && /tmp/sha1
package main

import (
	"crypto/sha1"
	"fmt"
	"io"
	"math/rand"
	"time"
)

const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

func randStringBytes(n int) string {
	b := make([]byte, n)
	for i := range b {
		b[i] = letterBytes[rand.Intn(len(letterBytes))]
	}
	return string(b)
}

func main() {
	n := 1_000_000
	bytes := 100
	strings := make([]string, n, n)
	for i := 0; i < n; i++ {
		strings[i] = randStringBytes(bytes)
	}

	start := time.Now()
	for _, s := range strings {
		h := sha1.New()
		io.WriteString(h, s)
		h.Sum(nil)
	}
	finish := time.Now()
	fmt.Printf("%v\n", finish.Sub(start))
}
492.378102ms