gohash.go

package main

import (
	"encoding/base64"
	"fmt"
	"math/rand"
	"time"

	"golang.org/x/crypto/bcrypt"
)

var bcryptCost = 12

const charset = "abcdefghijklmnopqrstuvwxyz" +
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

var seededRand *rand.Rand = rand.New(rand.NewSource(time.Now().UnixNano()))

func stringWithCharset(length int, charset string) string {
	b := make([]byte, length)
	for i := range b {
		b[i] = charset[seededRand.Intn(len(charset))]
	}
	return string(b)
}

func generateRandomString(length int) string {
	return stringWithCharset(length, charset)
}

func main() {
	// generate random string
	plaintext := generateRandomString(15)

	// convert string to byte array
	byteArray := []byte(plaintext)

	// hash the random string with the bcryptCost
	hashedPassword, err := bcrypt.GenerateFromPassword(byteArray, bcryptCost)

	if err != nil {
		panic(err)
	}
	// base64 encode the hash
	encoded := base64.StdEncoding.EncodeToString([]byte(hashedPassword))

	// print plain text and hashed/encoded result
	fmt.Println(string(encoded))
	fmt.Println(string(plaintext))
}