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diff --git a/echo/aes_enc_round.h b/echo/aes_enc_round.h
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+/* aes_enc_round.h */
+/*
+    This file is part of the ARM-Crypto-Lib.
+    Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef AES_ENC_ROUND_H_
+#define AES_ENC_ROUND_H_
+
+typedef struct{
+       uint8_t s[16];
+} aes_cipher_state_t;
+
+typedef struct{
+       uint8_t ks[16];
+} aes_roundkey_t;
+
+void aes_enc_round(aes_cipher_state_t* state, const aes_roundkey_t* k);
+
+
+#endif /* AES_ENC_ROUND_H_ */