How to Hash Passwords with Bcrypt in Golang for Node.js Compatibility?

Hashing Passwords with Bcrypt in Golang (Node.js Compatibility)

Migrating from Node.js and Passport to Golang for user authentication can present challenges, especially when handling encrypted passwords stored in the database. This guide explores how to create bcrypt hashed strings in Golang that are compatible with Node.js.

Node.js Encryption Code

var bcrypt = require('bcrypt');

bcrypt.genSalt(10, function(err, salt) {
    if(err) return next(err);

    bcrypt.hash(user.password, salt, function(err, hash) {
        if(err) return next(err);
        user.password = hash;
        next();
    });
});

Golang Equivalent

To achieve the same hashing results in Golang, use the golang.org/x/crypto/bcrypt package.

hashedPassword, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)

Working Example

package main

import (
    "golang.org/x/crypto/bcrypt"
    "fmt"
)

func main() {
    password := []byte("MyDarkSecret")

    // Hashing the password with the default cost of 10
    hashedPassword, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)
    if err != nil {
        panic(err)
    }
    fmt.Println(string(hashedPassword))

    // Comparing the password with the hash
    err = bcrypt.CompareHashAndPassword(hashedPassword, password)
    fmt.Println(err) // nil means it is a match
}

This example demonstrates the use of bcrypt in Golang to generate a hashed password equivalent to the one created in Node.js, allowing for seamless migration of encrypted passwords during the transition to Golang.

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