How to Securely Hash Passwords in PHP Using Bcrypt?

How to Employ Bcrypt for Hashing Passwords in PHP

Bcrypt is a recognized hashing algorithm, known for its scalability and efficiency. It incorporates a configurable number of rounds during the hashing process, making brute-force attacks computationally expensive and impractical. Furthermore, it mandates the use of salts, ensuring that identical passwords produce distinct hashes, hindering precomputed attacks.

bcrypt Implementation in PHP

PHP versions 5.5 and above natively support password hashing. Employ the password_hash() function to generate bcrypt hashes:

echo password_hash('rasmuslerdorf', PASSWORD_DEFAULT) . "\n"; // e.g., y$xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

To authenticate user-entered passwords against existing hashes:

$hash = 'y$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';

if (password_verify('rasmuslerdorf', $hash)) {
    echo 'Password is valid!';
} else {
    echo 'Invalid password.';
}

Bcrypt Usage in PHP Versions Prior to 5.5

For PHP versions 5.3.7 and lower, employ the crypt() function coupled with the Bcrypt compatibility class downloadable from GitHub.

Instantiate the Bcrypt class:

$bcrypt = new Bcrypt(15);

Hash a password:

$hash = $bcrypt->hash('password');

Verify a password:

$isGood = $bcrypt->verify('password', $hash);

Conclusion

Bcrypt is an indispensable tool for securing user passwords, preventing unauthorized access and maintaining data integrity. Implementing bcrypt in PHP is a crucial safeguard measure that protects your applications from password-based attacks.

The above is the detailed content of How to Securely Hash Passwords in PHP Using Bcrypt?. For more information, please follow other related articles on the PHP Chinese website!