diff --git a/src/AuthorizationValidators/BearerTokenValidator.php b/src/AuthorizationValidators/BearerTokenValidator.php
index 2bab4cb5..1547f6bf 100644
--- a/src/AuthorizationValidators/BearerTokenValidator.php
+++ b/src/AuthorizationValidators/BearerTokenValidator.php
@@ -12,6 +12,7 @@ namespace League\OAuth2\Server\AuthorizationValidators;
 use Lcobucci\JWT\Parser;
 use Lcobucci\JWT\Signer\Rsa\Sha256;
 use Lcobucci\JWT\ValidationData;
+use League\OAuth2\Server\CryptKey;
 use League\OAuth2\Server\CryptTrait;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface;
@@ -26,6 +27,11 @@ class BearerTokenValidator implements AuthorizationValidatorInterface
      */
     private $accessTokenRepository;
 
+    /**
+     * @var \League\OAuth2\Server\CryptKey
+     */
+    protected $publicKey;
+
     /**
      * @param AccessTokenRepositoryInterface $accessTokenRepository
      */
@@ -34,6 +40,16 @@ class BearerTokenValidator implements AuthorizationValidatorInterface
         $this->accessTokenRepository = $accessTokenRepository;
     }
 
+    /**
+     * Set the private key
+     *
+     * @param \League\OAuth2\Server\CryptKey $key
+     */
+    public function setPublicKey(CryptKey $key)
+    {
+        $this->publicKey = $key;
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/src/Grant/AbstractGrant.php b/src/Grant/AbstractGrant.php
index d916e3f1..3ac98cf4 100644
--- a/src/Grant/AbstractGrant.php
+++ b/src/Grant/AbstractGrant.php
@@ -11,6 +11,7 @@
 namespace League\OAuth2\Server\Grant;
 
 use League\Event\EmitterAwareTrait;
+use League\OAuth2\Server\CryptKey;
 use League\OAuth2\Server\CryptTrait;
 use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
 use League\OAuth2\Server\Entities\AuthCodeEntityInterface;
@@ -75,6 +76,11 @@ abstract class AbstractGrant implements GrantTypeInterface
      */
     protected $refreshTokenTTL;
 
+    /**
+     * @var \League\OAuth2\Server\CryptKey
+     */
+    protected $privateKey;
+
     /**
      * @param ClientRepositoryInterface $clientRepository
      */
@@ -131,6 +137,16 @@ abstract class AbstractGrant implements GrantTypeInterface
         $this->refreshTokenTTL = $refreshTokenTTL;
     }
 
+    /**
+     * Set the private key
+     *
+     * @param \League\OAuth2\Server\CryptKey $key
+     */
+    public function setPrivateKey(CryptKey $key)
+    {
+        $this->privateKey = $key;
+    }
+
     /**
      * Validate the client.
      *
diff --git a/src/Grant/GrantTypeInterface.php b/src/Grant/GrantTypeInterface.php
index 34028ccb..7aa98242 100644
--- a/src/Grant/GrantTypeInterface.php
+++ b/src/Grant/GrantTypeInterface.php
@@ -126,13 +126,6 @@ interface GrantTypeInterface extends EmitterAwareInterface
      */
     public function setPrivateKey(CryptKey $privateKey);
 
-    /**
-     * Set the path to the public key.
-     *
-     * @param CryptKey $publicKey
-     */
-    public function setPublicKey(CryptKey $publicKey);
-
     /**
      * Set the encryption key
      *
diff --git a/src/ResponseTypes/AbstractResponseType.php b/src/ResponseTypes/AbstractResponseType.php
index 6e164392..0c256f17 100644
--- a/src/ResponseTypes/AbstractResponseType.php
+++ b/src/ResponseTypes/AbstractResponseType.php
@@ -11,6 +11,7 @@
 
 namespace League\OAuth2\Server\ResponseTypes;
 
+use League\OAuth2\Server\CryptKey;
 use League\OAuth2\Server\CryptTrait;
 use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
 use League\OAuth2\Server\Entities\RefreshTokenEntityInterface;
@@ -29,6 +30,11 @@ abstract class AbstractResponseType implements ResponseTypeInterface
      */
     protected $refreshToken;
 
+    /**
+     * @var CryptKey
+     */
+    protected $privateKey;
+
     /**
      * {@inheritdoc}
      */
@@ -44,4 +50,15 @@ abstract class AbstractResponseType implements ResponseTypeInterface
     {
         $this->refreshToken = $refreshToken;
     }
+
+    /**
+     * Set the private key
+     *
+     * @param \League\OAuth2\Server\CryptKey $key
+     */
+    public function setPrivateKey(CryptKey $key)
+    {
+        $this->privateKey = $key;
+    }
+
 }