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Q:

I'm looking for a PHP program that implements a basic user authentication system using password hashing and salting. Does anyone have a code snippet for that?

Hi everyone,

I hope you're doing well. I'm new to PHP and currently working on a project where I need to implement a user authentication system. I've been researching and I came across the concept of password hashing and salting to enhance security.

I understand the theory behind password hashing and salting, but I'm struggling to find a PHP program that actually demonstrates the implementation. I've read about using functions like `password_hash()` and `password_verify()`, but I'm not sure how to put it all together.

If anyone has a code snippet or example that showcases a basic user authentication system using password hashing and salting in PHP, I'd really appreciate it. It would help me understand how to securely store user passwords in my system.

Thank you in advance for your help!

All Replies

leuschke.perry

Hey there,

I understand your struggle with implementing a secure user authentication system using password hashing and salting in PHP. I was in a similar situation a while back and managed to find a useful code snippet that helped me get started.

To begin with, make sure you have PHP 5.5 or later, as the `password_hash()` function requires it. Here's an example code snippet that illustrates the process:

php
// Registering a new user
$password = "userpassword";
$salt = generateSalt(); // This function should generate a random salt
$hashedPassword = password_hash($password . $salt, PASSWORD_DEFAULT);

// Storing the hashed password and salt in your database

// Authenticating a user
$enteredPassword = $_POST['password']; // Retrieve the user-entered password
$savedHashedPassword = getHashedPasswordFromDB(); // Retrieve the hashed password from the database

if (password_verify($enteredPassword . $salt, $savedHashedPassword)) {
// Password is correct, proceed with authentication
} else {
// Password is incorrect, display an error message
}


In this example, the `generateSalt()` function is responsible for generating a random salt value, which should be unique for each user. Make sure to store both the hashed password and the salt in your database when you register a new user.

During the authentication process, the user-entered password is combined with the salt used during registration. The combined value is then hashed and compared with the saved hashed password retrieved from the database using the `password_verify()` function.

Remember to customize this code to fit your specific project needs, such as incorporating database operations and ensuring secure handling of user input.

I hope this helps get you started on implementing a secure user authentication system using password hashing and salting in PHP. Good luck with your project, and let me know if you have any further questions!

joel.moen

Hey everyone,

I can totally relate to the challenges of implementing a user authentication system with password hashing and salting in PHP. When I was working on a similar project, I struggled with understanding the concept and finding a suitable code snippet.

Fortunately, after some trial and error, I stumbled upon a helpful resource that provided a clear example. Here's a condensed version of what I learned:

php
// Registering a new user
$password = "userpassword";
$salt = generateSalt(); // Custom function for generating a random salt
$hashedPassword = password_hash($password . $salt, PASSWORD_DEFAULT);

// Storing the hashed password and salt in the database

// Authenticating a user
$enteredPassword = $_POST['password']; // Retrieve the user-entered password
$savedHashedPassword = getHashedPasswordFromDB(); // Retrieve hashed password from the database

if (password_verify($enteredPassword . $salt, $savedHashedPassword)) {
// Authentication successful, proceed
} else {
// Authentication failed, display error
}


In this example, it's important to note that you need PHP 5.5 or above to leverage the `password_hash()` function. The `generateSalt()` function should generate a unique salt value for each user during registration.

During authentication, the entered password is concatenated with the saved salt, and the resulting value is hashed. This hashed value is then compared with the saved hashed password retrieved from the database using `password_verify()`.

Remember to tailor this code to your specific project requirements, ensuring proper database integration and secure handling of user input.

I hope this personal experience helps you in implementing password hashing and salting for your user authentication system in PHP. Don't hesitate to reach out if you have any further questions. Best of luck with your project!

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