diff --git a/composer.json b/composer.json
index 42155c7..dacd684 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,8 @@
         "nette/utils": "^4.0",
         "eventsauce/object-hydrator": "^1.4",
         "symfony/options-resolver": "^7.1",
-        "symfony/dom-crawler": "^7.1"
+        "symfony/dom-crawler": "^7.1",
+        "phpseclib/phpseclib": "~2.0"
     },
     "require-dev": {
         "php-http/curl-client": "^2.3",
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 09bd621..aab4991 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -1,6 +1,2 @@
 parameters:
-	ignoreErrors:
-		-
-			message: "#^Parameter \\#2 \\$length of function str_split expects int\\<1, max\\>, int given\\.$#"
-			count: 1
-			path: src/Encryption/Encrypter.php
+	ignoreErrors: []
diff --git a/src/Encryption/Encrypter.php b/src/Encryption/Encrypter.php
index 7339402..c20a8f1 100644
--- a/src/Encryption/Encrypter.php
+++ b/src/Encryption/Encrypter.php
@@ -2,36 +2,24 @@
 
 namespace IPay\Encryption;
 
-const IPAY_PUBLIC_KEY = <<<PUB
+use phpseclib\Crypt\RSA;
+
+final class Encrypter
+{
+    private const IPAY_PUBLIC_KEY = <<<PUBLIC
 -----BEGIN PUBLIC KEY-----
 MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLenQHmHpaqYX4IrRVM8H1uB21
 xWuY+clsvn79pMUYR2KwIEfeHcnZFFshjDs3D2ae4KprjkOFZPYzEWzakg2nOIUV
 WO+Q6RlAU1+1fxgTvEXi4z7yi+n0Zs0puOycrm8i67jsQfHi+HgdMxCaKzHvbECr
 +JWnLxnEl6615hEeMQIDAQAB
 -----END PUBLIC KEY-----
-PUB;
+PUBLIC;
 
-class Encrypter
-{
     public static function encrypt(string $message): string
     {
-        $mlen = strlen($message);
-
-        $result = '';
-        foreach (str_split(
-            $message,
-            (int) ceil($mlen / ceil($mlen / 86))
-        ) as $part) {
-            openssl_public_encrypt(
-                $part,
-                $part,
-                IPAY_PUBLIC_KEY,
-                OPENSSL_PKCS1_OAEP_PADDING
-            );
-
-            $result .= $part;
-        }
+        $rsa = new RSA();
+        $rsa->loadKey(static::IPAY_PUBLIC_KEY);
 
-        return base64_encode($result);
+        return base64_encode($rsa->encrypt($message));
     }
 }