Only do file_get_contents on PHP versions needed

src/StreamEncryption.php

@@ -18,10 +18,23 @@ class StreamEncryption
 
     private $errstr;
     private $errno;
+
+    private $wrapSecure = false;
 
     public function __construct(LoopInterface $loop)
     {
         $this->loop = $loop;
+
+        // See https://bugs.php.net/bug.php?id=65137
+        // On versions affected by this bug we need to fread the stream until we
+        //  get an empty string back because the buffer indicator could be wrong
+        if (
+            PHP_VERSION_ID < 50433
+         || (PHP_VERSION_ID >= 50000 && PHP_VERSION_ID < 50517)
+         || PHP_VERSION_ID === 50600
+        ) {
+            $this->wrapSecure = true;
+        }
     }
 
     public function enable(Stream $stream)
@@ -59,7 +72,7 @@ public function toggle(Stream $stream, $toggle)
         $toggleCrypto();
 
         return $deferred->promise()->then(function () use ($stream, $toggle) {
-            if ($toggle) {
+            if ($toggle && $this->wrapSecure) {
                 return new SecureStream($stream, $this->loop);
             }