+/* skipjack.c */
+/*
+ This file is part of the Crypto-avr-lib/microcrypt-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/>.
+*/
/**
*
*
#include <avr/io.h>
#include <avr/pgmspace.h>
+#define SKIPJACK_CNT_BIG
+
+#ifdef SKIPJACK_CNT_BIG
+ #define SKIPJACK_CNT_SHIFT <<8
+#else
+ #define SKIPJACK_CNT_SHIFT
+#endif
+
/*****************************************************************************/
uint8_t skipjack_ftable[] PROGMEM ={
w[3] = w[2];
w[2] = w[1];
w[1] = skipjack_g(w[0],k-1,key);
- w[0] = t ^ w[1] ^ k<<8;
+ w[0] = t ^ w[1] ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT);
}
/*****************************************************************************/
w[0] = skipjack_g_inv(w[1],k-1,key);
w[1] = w[2];
w[2] = w[3];
- w[3] = t ^ k<<8;
+ w[3] = t ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT);
}
/*****************************************************************************/
t = w[0];
w[0] = w[3];
w[3] = w[2];
- w[2] = t ^ k<<8 ^ w[1];
+ w[2] = t ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT) ^ w[1];
w[1] = skipjack_g(t,k-1,key);
}
w[2] = w[3];
w[3] = w[0];
w[0] = skipjack_g_inv(w[1],k-1,key);
- w[1] = w[0] ^ t ^ k<<8;
+ w[1] = w[0] ^ t ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT);
}
/*****************************************************************************/