pswHash

pswHash

pswHash is a simple Go password hashing module. This module uses the pbkdf2 algorithm along with a sha256 digest. It is a one-way hash.

$ go get github.com/tdeni/pswHash

Latest - v1.0.1

Since it follows the exact same schematics the default password hasher in python's Django framework, it can be used to verify passwords when moving to a Go backend but with the same old database from Django.

Read the example.go file in the Example folder of this repository for a clear understanding.

API Reference :

1. Encode

func Encode(password string, salt []byte, iterations int) string

Returns an encoded string in the format of <algorithm>$<iterations>$<salt>$<hash>. Here <algorithm> is pbkdf2_sha256 and the number of iterations is 320000 by default.

2. Decode

func Decode(encoded string) *DecodedHash

Where DecodedHash is a struct of the form :

type DecodedHash struct {
	algorithm  string
	hash       string
	iterations int
	salt       string
}

3. Verify

func Verify(password string, encoded string) bool

Returns true if they match, else false. Uses subtle.ConstantTimeCompare.

4. SafeView

func SafeView(encoded string) *DecodedHash

Returns a struct of type DecodedHash that contains the algorithm, iterations, salt and hash, however, the salt and the hash are masked with *.

// snippet of code from "github.com/saurabh0719/pswHash/pswHash.go"

safeView := &DecodedHash{
		algorithm:  decoded.algorithm,
		iterations: decoded.iterations,
		salt:       maskHash(decoded.salt),
		hash:       maskHash(decoded.hash),
	}

5. Salt

func Salt(length int) ([]byte, error)

Generates and returns a random salt of the given length.