README

Simple helper library for hashing and verifying passwords using the Blowfish (bcrypt) algorithm in PHP.

✨ Features

• Secure password hashing via password_hash() (bcrypt)
• Password verification helper
• Configurable cost factor
• Backwards-compatible method names (crypt_blowfish, checkPassword) retained

📦 Installation

Via Composer (recommended):

composer require luisinder/blowfish-lib

Or clone/download and include the file manually:

require_once __DIR__ . '/src/blowFish.php';

✅ Requirements

• PHP >= 7.4

🚀 Usage

require_once __DIR__ . '/vendor/autoload.php';

$bf = new BlowFish(12); // cost factor 12

$hash = $bf->hashPassword('My$ecretP@ss');

if ($bf->verifyPassword('My$ecretP@ss', $hash)) {
	echo "Password valid"; 
} else {
	echo "Invalid password";
}

Backwards Compatibility

Older code using:

$bf->crypt_blowfish($password);
$bf->checkPassword($plain, $hash);

…will still function, but you should migrate to:

$bf->hashPassword($password);
$bf->verifyPassword($plain, $hash);

An internal class_alias keeps the legacy lowercase blowFish class name available.

Rehashing Strategy

You can detect when to upgrade stored hashes to a higher cost:

$bf = new BlowFish(10);
$hash = $bf->hashPassword('secret');

// Later increase cost
$bfStronger = new BlowFish(12);
if ($bfStronger->needsRehash($hash)) {
	$hash = $bfStronger->hashPassword('secret');
}

⚙️ Cost Factor Guidance

Typical values: 10–14. Higher = more secure but slower. Benchmark in your environment aiming for ~100ms or less per hash for interactive logins.

🔒 Security Notes

• Do NOT store plain passwords.
• Always use password_verify() (wrapped by verifyPassword).
• Rotate the cost upwards over time; you can rehash existing hashes with password_needs_rehash() externally if desired (not included to keep this helper minimal).

📄 License

MIT. See LICENSE.

🧾 Changelog

See CHANGELOG.md for notable changes.

🤝 Contributing

Issues and pull requests are welcome. Please include a clear description and if possible a test snippet to reproduce or validate the change.

🧪 Example Script

Run the included example after install:

composer run example

🧪 Tests

Install dev dependencies and run PHPUnit:

composer install
composer test

🛠 Continuous Integration

GitHub Actions workflow runs the test suite on PHP 7.4–8.3. See .github/workflows/ci.yml.

Author

Luis Cajigas

Enjoy and stay secure!