symfony
diff --git a/‎src/Symfony/Component/Security/Core/Encryption/PhpseclibEncryption.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Security/Core/Encryption/PhpseclibEncryption.php
+4Lines changed: 4 additions & 0 deletions b/‎src/Symfony/Component/Security/Core/Encryption/PhpseclibEncryption.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Security/Core/Encryption/PhpseclibEncryption.php
+4Lines changed: 4 additions & 0 deletions
@@ -19,6 +19,10 @@
 use Symfony\Component\Security\Core\Exception\UnsupportedAlgorithmException;
 use Symfony\Component\Security\Core\Exception\WrongEncryptionKeyException;
 
+if (!class_exists(RSA::class)) {
+    throw new \LogicException('You cannot use "Symfony\Component\Security\Core\Encryption\PhpseclibEncryption" as the "phpseclib/phpseclib:2.x" package is not installed. Try running "composer require phpseclib/phpseclib:^2".');
+}
+
 /**
  * The secret key length should be 32 bytes, but other sizes are accepted.
  *