diff --git a/src/algo/aes.hpp b/src/algo/aes.hpp
index 931b28d..657d6c0 100644
--- a/src/algo/aes.hpp
+++ b/src/algo/aes.hpp
@@ -24,7 +24,7 @@
 #include "random-number-generator.hpp"
 #include "algo/encrypt-params.hpp"
 #include "decrypt-key.hpp"
-#include "error.hpp"
+
 
 namespace ndn {
 namespace gep {
@@ -40,10 +40,14 @@
   deriveEncryptKey(const Buffer& keyBits);
 
   static Buffer
-  decrypt(const Buffer& keyBits, const Buffer& encryptedData, const EncryptParams& params);
+  decrypt(const uint8_t* key, size_t keyLen,
+          const uint8_t* payload, size_t payloadLen,
+          const EncryptParams& params);
 
   static Buffer
-  encrypt(const Buffer& keyBits, const Buffer& plainData, const EncryptParams& params);
+  encrypt(const uint8_t* key, size_t keyLen,
+          const uint8_t* payload, size_t payloadLen,
+          const EncryptParams& params);
 };
 
 typedef DecryptKey<Aes> AesEncryptKey;