diff --git a/src/Cache/SimpleCache.php b/src/Cache/SimpleCache.php
new file mode 100644
index 00000000000..44016329e6e
--- /dev/null
+++ b/src/Cache/SimpleCache.php
@@ -0,0 +1,130 @@
+<?php
+namespace Cake\Cache;
+
+use Psr\SimpleCache\CacheInterface;
+use Psr\SimpleCache\InvalidArgumentException;
+use Cake\Cache\CacheEngine;
+
+class SimpleCache implements CacheInterface
+{
+    /**
+     * @var \Cake\Cache\CacheEngine
+     */
+    protected $engine;
+
+    public function __construct(CacheEngine $engine)
+    {
+        $this->engine = $engine;
+    }
+
+    public function get($key, $default = null)
+    {
+        $result = $engine->read($key);
+
+        return $result === false ? $default : $result;
+    }
+
+    public function set($key, $value, $ttl = null)
+    {
+        if ($ttl !== null) {
+            $duration = $this->engine->getConfig('duration');
+            $this->engine->setConfig('duration', $this->ttlToSeconds($ttl));
+        }
+
+        try {
+            $result = $this->engine->write($key, $value);
+        } finally {
+            if ($ttl !== null) {
+                $this->engine->setConfig('duration', $duration);
+            }
+        }
+
+        return $result;
+    }
+
+    public function delete($key)
+    {
+        return $this->engine->delete($key);
+    }
+
+    public function clear()
+    {
+        return $this->engine->clear(false);
+    }
+
+    public function getMultiple($keys, $default = null)
+    {
+        $keys   = $this->getAsArray($keys);
+        $result = [];
+
+        foreach ($keys as $key) {
+            $value = $this->engine->get($key, $default);
+        }
+
+        return $result;
+    }
+
+    public function setMultiple($values, $ttl = null)
+    {
+        if ($ttl !== null) {
+            $duration = $this->engine->getConfig('duration');
+            $this->engine->setConfig('duration', $this->ttlToSeconds($ttl));
+        }
+
+        try {
+            $result = true;
+            foreach ($values as $key => $value) {
+                $result = $this->engine->set($key, $value) && $result;
+            }
+        } finally {
+            if ($ttl !== null) {
+                $this->engine->setConfig('duration', $duration);
+            }
+        }
+
+        return $result;
+    }
+
+    public function deleteMultiple($keys)
+    {
+        $keys = $this->getAsArray($keys);
+
+        $result = true;
+        foreach ($keys as $key) {
+            $result = $this->engine->delete($key) && $result;
+        }
+
+        return $result;
+    }
+
+    public function has($key)
+    {
+        return $this->get($key) === null ? false : true;
+    }
+
+    protected function getAsArray($keys)
+    {
+        if ($keys instanceof \Traversable) {
+            return iterator_to_array($keys);
+        }
+
+        if (is_array($keys)) {
+            return $keys;
+        }
+
+        throw new InvalidArgumentException('"$keys" must be an array or instanceof Traversable');
+    }
+
+    /**
+     * @param int|\DateInterval $ttl
+     * @return int seconds
+     */
+    function ttlToSeconds($ttl)
+    {
+        if (is_int($ttl)) {
+            return $ttl;
+        }
+
+        return $ttl->days * 86400 + $ttl->h * 3600 + $ttl->i * 60 + $ttl->s;
+    }
+}
diff --git a/src/Http/Middleware/CsrfProtectionMiddleware.php b/src/Http/Middleware/CsrfProtectionMiddleware.php
index d766b83c1fe..35ac42fa8d0 100644
--- a/src/Http/Middleware/CsrfProtectionMiddleware.php
+++ b/src/Http/Middleware/CsrfProtectionMiddleware.php
@@ -14,12 +14,12 @@
  */
 namespace Cake\Http\Middleware;
 
+use Cake\Http\Response;
+use Cake\Http\ServerRequest;
 use Cake\I18n\Time;
 use Cake\Network\Exception\InvalidCsrfTokenException;
 use Cake\Utility\Hash;
 use Cake\Utility\Security;
-use Psr\Http\Message\ResponseInterface;
-use Psr\Http\Message\ServerRequestInterface;
 
 /**
  * Provides CSRF protection & validation.
@@ -77,12 +77,12 @@ public function __construct(array $config = [])
     /**
      * Checks and sets the CSRF token depending on the HTTP verb.
      *
-     * @param \Psr\Http\Message\ServerRequestInterface $request The request.
-     * @param \Psr\Http\Message\ResponseInterface $response The response.
+     * @param \Cake\Http\ServerRequest $request The request.
+     * @param \Cake\Http\Response $response The response.
      * @param callable $next Callback to invoke the next middleware.
-     * @return \Psr\Http\Message\ResponseInterface A response
+     * @return \Cake\Http\Response A response
      */
-    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, $next)
+    public function __invoke(ServerRequest $request, Response $response, $next)
     {
         $cookies = $request->getCookieParams();
         $cookieData = Hash::get($cookies, $this->_config['cookieName']);
@@ -109,10 +109,10 @@ public function __invoke(ServerRequestInterface $request, ResponseInterface $res
     /**
      * Checks if the request is POST, PUT, DELETE or PATCH and validates the CSRF token
      *
-     * @param \Psr\Http\Message\ServerRequestInterface $request The request object.
-     * @return \Psr\Http\Message\ServerRequestInterface
+     * @param \Cake\Http\ServerRequest $request The request object.
+     * @return \Cake\Http\ServerRequest
      */
-    protected function _validateAndUnsetTokenField(ServerRequestInterface $request)
+    protected function _validateAndUnsetTokenField(ServerRequest $request)
     {
         if (in_array($request->getMethod(), ['PUT', 'POST', 'DELETE', 'PATCH']) || $request->getData()) {
             $this->_validateToken($request);
@@ -140,10 +140,10 @@ protected function _createToken()
      * Add a CSRF token to the request parameters.
      *
      * @param string $token The token to add.
-     * @param \Psr\Http\Message\ServerRequestInterface $request The request to augment
-     * @return \Psr\Http\Message\ServerRequestInterface Modified request
+     * @param \Cake\Http\ServerRequest $request The request to augment
+     * @return \Cake\Http\ServerRequest Modified request
      */
-    protected function _addTokenToRequest($token, ServerRequestInterface $request)
+    protected function _addTokenToRequest($token, ServerRequest $request)
     {
         $params = $request->getAttribute('params');
         $params['_csrfToken'] = $token;
@@ -155,11 +155,11 @@ protected function _addTokenToRequest($token, ServerRequestInterface $request)
      * Add a CSRF token to the response cookies.
      *
      * @param string $token The token to add.
-     * @param \Psr\Http\Message\ServerRequestInterface $request The request to validate against.
-     * @param \Psr\Http\Message\ResponseInterface $response The response.
-     * @return @param \Psr\Http\Message\ResponseInterface $response Modified response.
+     * @param \Cake\Http\ServerRequest $request The request to validate against.
+     * @param \Cake\Http\Response $response The response.
+     * @return @param \Cake\Http\Response $response Modified response.
      */
-    protected function _addTokenCookie($token, ServerRequestInterface $request, ResponseInterface $response)
+    protected function _addTokenCookie($token, ServerRequest $request, Response $response)
     {
         $expiry = new Time($this->_config['expiry']);
 
@@ -175,11 +175,11 @@ protected function _addTokenCookie($token, ServerRequestInterface $request, Resp
     /**
      * Validate the request data against the cookie token.
      *
-     * @param \Psr\Http\Message\ServerRequestInterface $request The request to validate against.
+     * @param \Cake\Http\ServerRequest $request The request to validate against.
      * @return void
      * @throws \Cake\Network\Exception\InvalidCsrfTokenException When the CSRF token is invalid or missing.
      */
-    protected function _validateToken(ServerRequestInterface $request)
+    protected function _validateToken(ServerRequest $request)
     {
         $cookies = $request->getCookieParams();
         $cookie = Hash::get($cookies, $this->_config['cookieName']);