optimisation temps getSecretKey

Crypto/Crypto.php

@@ -7,6 +7,8 @@ class Crypto
     private static $key = "ClefLogipro";
     private static $salt = "";
 
+    private static $secretKey = null;
+
     public static function crypt($data)
     {
         $secretKey = self::getSecretKey();
@@ -59,20 +61,21 @@ class Crypto
         return $plain;
     }
 
-    protected static function getSecretKey()
+    /**
+     * calcul et renvoi une clef de la durée de vie du script
+     *
+     * @return string clef de 32 bytes
+     */
+    protected static function getSecretKey() : string
     {
-        if (empty(self::$salt)) {
-            self::$salt = \mb_substr("GHXVV706DHYGYROUGZDVQ9FGQVU8ZG6KQCZ1BPUWM6OFHDHLXERCTBVHSLBFXM7F", 0, SODIUM_CRYPTO_PWHASH_SALTBYTES, '8bit');
+        if (self::$secretKey !=null) {
+            return self::$secretKey;
         }
-        $secretKey = \sodium_crypto_pwhash(
-            32,
-            self::$key,
-            self::$salt,
-            SODIUM_CRYPTO_PWHASH_OPSLIMIT_MODERATE,
-            SODIUM_CRYPTO_PWHASH_MEMLIMIT_MODERATE,
-            SODIUM_CRYPTO_PWHASH_ALG_DEFAULT
-        );
-
-        return $secretKey;
+        $chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+        self::$secretKey = '';
+        for ($i=0; $i<32; $i++) {
+            self::$secretKey .= $chars[rand(0, strlen($chars)-1)];
+        }
+        return self::$secretKey;
     }
 }