Zend Crypt Laravel Package

Getting Started

Start by installing the package via Composer (though note it’s archived and unmaintained—see Gotchas). For new projects, consider migrating to paragonie/whirlpool, defuse/php-encryption, or Laravel’s native Hash/Crypt facades. If constrained to use zend-crypt (e.g., legacy code), install with:

composer require zendframework/zend-crypt

First use case: securely hashing passwords using Bcrypt:

use Zend\Crypt\Password\Bcrypt;

$bcrypt = new Bcrypt(['cost' => 12]);
$hashed = $bcrypt->create('user_password');
$valid   = $bcrypt->verify('user_password', $hashed);

Check src/Password/ and src/Symmetric/ in the repo for core classes—start with PasswordFactory or BlockCipher for basic workflows.

Implementation Patterns

• Password hashing: Always use Zend\Crypt\Password\Bcrypt (or Scrypt/Pbkdf2 if required). Avoid rolling custom hashers—validate against stored hashes via verify() with constant-time comparison.
• Symmetric encryption: Use BlockCipher with modern algorithms (e.g., AES-256-CBC). Generate keys with Zend\Crypt\Key\Derivation\PBKDF2 (never hardcode secrets):

  use Zend\Crypt\BlockCipher;
  use Zend\Crypt\Key\Derivation\PBKDF2;
  
  $cipher = BlockCipher::factory('openssl', ['algo' => 'aes-256-cbc']);
  $key = PBKDF2::derive('master_secret', 'salt123', 100000, 32);
  $cipher->setKey($key);
  
  $encrypted = $cipher->encrypt(['data' => 'sensitive_value']);
  $decrypted = $cipher->decrypt($encrypted);
  

• Randomness & HMAC: Use Zend\Crypt\Random for tokens (e.g., CSRF):

  $token = bin2hex(Random::getString(32)); // or ->getRandomBytes(32)
  

  For integrity:

  use Zend\Crypt\Hash;
  $hash = Hash::compute('sha256', 'secret_key', $message);
  

Integrate into Laravel via a custom Encrypter wrapper or store sensitive config values encrypted in .env (derive key per-environment).

Gotchas and Tips

⚠️ Critical: This package is archived (since 2019) and unmaintained. Prefer Laravel’s built-in Crypt (which uses OpenSSL directly) or modern standalone libraries like defuse/php-encryption. Using zend-crypt in new code introduces unpatched security risks.

• Algorithm defaults: BlockCipher defaults to openssl and mcrypt—but mcrypt is removed in PHP 7.2+. Ensure openssl is used explicitly.
• IV handling: BlockCipher manages IVs automatically (appends to ciphertext), but ensure storage/transmission preserves the full payload. Never reuse keys across environments without re-derivation.
• Password verification timing: Always use verify()—not ===—to prevent timing attacks.
• Configuration quirks: The Zend\Crypt\Password\PasswordAdapterFactory requires strict config format (['algorithm' => 'bcrypt', 'cost' => 13]). Misformatted configs silently fallback or throw.
• Extensibility: Extend Zend\Crypt\Password\PasswordInterface for custom schemes (e.g., Argon2 via password_hash() wrapper), but validate thoroughly.
• Debugging tip: Enable zend-crypt’s internal exception logging by wrapping operations in try/catch—errors like invalid IVs or bad keys throw Exception\RuntimeException.