-/* serpent.h
- * a bitsliced implementation of the serpent cipher for avr microcontrollers
- * author: Daniel Otte
- * license: GPLv3
+/* serpent.h */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2008 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/>.
+*/
+/** \file serpent.h
+ * \author Daniel Otte
+ * \license GPLv3
+ * \brief a implementation of the serpent cipher for avr microcontrollers
*/
#ifndef SERPENT_H_
#include <stdint.h>
-typedef uint8_t serpent_subkey_t[16];
+typedef uint32_t serpent_subkey_t[4];
typedef struct serpent_ctx_st {
serpent_subkey_t k[33];
} serpent_ctx_t;
+#define SERPENT_KEY128 128
+#define SERPENT_KEY192 192
+#define SERPENT_KEY256 256
+
+
/* key must be 256bit (32 byte) large! */
-void serpent_genctx(void * key, serpent_ctx_t * ctx);
-void serpent_enc(void * buffer, serpent_ctx_t * ctx);
-void serpent_dec(void * buffer, serpent_ctx_t * ctx);
+void serpent_init(const void* key, uint16_t keysize_b, serpent_ctx_t* ctx);
+void serpent_enc(void* buffer, const serpent_ctx_t* ctx);
+void serpent_dec(void* buffer, const serpent_ctx_t* ctx);
#endif /*SERPENT_H_*/