diff --git a/keystore/blob.h b/keystore/blob.h
index 6a52ca4..4a35842 100644
--- a/keystore/blob.h
+++ b/keystore/blob.h
@@ -24,6 +24,7 @@
 
 #include <keystore/keymaster_types.h>
 #include <keystore/keystore.h>
+#include <vector>
 
 constexpr size_t kValueSize = 32768;
 constexpr size_t kAesKeySize = 128 / 8;
@@ -120,8 +121,10 @@
     keystore::SecurityLevel getSecurityLevel() const;
     void setSecurityLevel(keystore::SecurityLevel);
 
-    ResponseCode writeBlob(const std::string& filename, const uint8_t* aes_key, State state);
-    ResponseCode readBlob(const std::string& filename, const uint8_t* aes_key, State state);
+    ResponseCode writeBlob(const std::string& filename, const std::vector<uint8_t>& aes_key,
+                           State state);
+    ResponseCode readBlob(const std::string& filename, const std::vector<uint8_t>& aes_key,
+                          State state);
 
   private:
     blobv3 mBlob;