Golang : Bcrypting password



Tags : golang password salt bcrypt

From my past tutorial on salting password, a reader pointed out that there is a better way to handle/protect users passwords in case hackers managed to get the database plaintext data dump. The method he suggested is to use bcrypt algorithm...which automagically handle the salting part well. The code below is my own experiment with the bcrypt package for Golang and see if it can be useful to you. UPDATE: Fixed errata cipherText := saltedCipherText[23:] to cipherText := saltedCipherText[22:] Thanks Steve Sharp for pointing out. Here you go! package main import ( "fmt" "golang.org/x/crypto/bcrypt" "strings" ) func main() { passwd := []byte("password") hashedPassword, err := bcrypt.GenerateFromPassword(passwd, 10) if err != nil { panic(err) fmt.Printf("The hashed password is : %s\n", string(hashedPassword)) fmt.Printf("%q\n", strings.SplitN(string(hashedPassword), "$", 4)) parts := strings.SplitN(string(hashedPassword), "$", 4) algorithm := parts[1] costFactor := parts[2] // number of iterations. Higher cost will increase brute force difficulty saltedCipherText := parts[3] fmt.Println("Algorithm : ", algorithm) fmt.Println("Cost Factor : ", costFactor) fmt.Println("Salt + Cipher Text : ", saltedCipherText) // in case you still want to store the salt separately in your database salt := saltedCipherText[0:22] fmt.Println("Salt : ", salt) cipherText := saltedCipherText[22:] fmt.Println("Cipher Text : ", cipherText) Sample output : The hashed password is : $2a$10$qevL45Hnebe0SlbTKT36kuX87fq/sWDjzozJ/4OMh1hPcOo/SASqO ["" "2a" "10" "qevL45Hnebe0SlbTKT36kuX87fq/sWDjzozJ/4OMh1hPcOo/SASqO"] Algorithm : 2a Cost Factor : 10 Salt + Cipher Text : qevL45Hnebe0SlbTKT36kuX87fq/sWDjzozJ/4OMh1hPcOo/SASqO Salt : qevL45Hnebe0SlbTKT36ku Cipher Text : X87fq/sWDjzozJ/4OMh1hPcOo/SASqO References : https://github.com/golang/crypto/blob/master/bcrypt/bcrypt_test.go http://dustwell.com/how-to-handle-passwords-bcrypt.html

  See also : Golang : Securing password with salt



Tags : golang password salt bcrypt

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


Advertisement

Advertisement

Advertisement

Advertisement