insereated GPLv3 stub

[avr-crypto-lib.git] / serpent.c

diff --git a/serpent.c b/serpent.c
index 85cf4a852e4a731d46fc63e3baf852deeb5acd05..7042a41083ad69424040f2994ac97792ca7ab401 100644 (file)
--- a/serpent.c
+++ b/serpent.c
@@ -1,3 +1,21 @@
+/* serpent.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/>.
+*/
 /* serpent.c
  * a bitsliced implementation of the serpent cipher for avr microcontrollers
  * author: Daniel Otte 
@@ -9,103 +27,7 @@
 #include <string.h> /* memset() */
 #include <avr/pgmspace.h>
 #include "serpent.h"
-
-uint8_t sbox[] PROGMEM = {
- 0x38, 0xF1, 0xA6, 0x5B, 0xED, 0x42, 0x70, 0x9C,
- 0xFC, 0x27, 0x90, 0x5A, 0x1B, 0xE8, 0x6D, 0x34, 
- 0x86, 0x79, 0x3C, 0xAF, 0xD1, 0xE4, 0x0B, 0x52,
- 0x0F, 0xB8, 0xC9, 0x63, 0xD1, 0x24, 0xA7, 0x5E,
- 0x1F, 0x83, 0xC0, 0xB6, 0x25, 0x4A, 0x9E, 0x7D,
- 0xF5, 0x2B, 0x4A, 0x9C, 0x03, 0xE8, 0xD6, 0x71,
- 0x72, 0xC5, 0x84, 0x6B, 0xE9, 0x1F, 0xD3, 0xA0,
- 0x1D, 0xF0, 0xE8, 0x2B, 0x74, 0xCA, 0x93, 0x56,
-/* now the inverted sboxes */
- 0xD3, 0xB0, 0xA6, 0x5C, 0x1E, 0x47, 0xF9, 0x82,
- 0x58, 0x2E, 0xF6, 0xC3, 0xB4, 0x79, 0x1D, 0xA0,
- 0xC9, 0xF4, 0xBE, 0x12, 0x03, 0x6D, 0x58, 0xA7,
- 0x09, 0xA7, 0xBE, 0x6D, 0x35, 0xC2, 0x48, 0xF1,
- 0x50, 0x83, 0xA9, 0x7E, 0x2C, 0xB6, 0x4F, 0xD1,
- 0x8F, 0x29, 0x41, 0xDE, 0xB6, 0x53, 0x7C, 0xA0,
- 0xFA, 0x1D, 0x53, 0x60, 0x49, 0xE7, 0x2C, 0x8B,
- 0x30, 0x6D, 0x9E, 0xF8, 0x5C, 0xB7, 0xA1, 0x42
-};        
-         
-
-#define SHR_O(a) c=(a)&1; ((a) = (a)>>1)
-#define SHR_I(a) ((a) = (c?0x80:0x00)| ((a)>>1))
-
-static void ip(uint8_t *o, uint32_t *i){
-       uint8_t c; // carry 
-       uint8_t n,m;
-       memset(o, 0, 16);
-       for(n=0; n<16; ++n){
-               for(m=0; m<2; ++m){
-               SHR_O(i[0]);
-               SHR_I(o[n]);
-               SHR_O(i[1]);
-               SHR_I(o[n]);
-               SHR_O(i[2]);
-               SHR_I(o[n]);
-               SHR_O(i[3]);
-               SHR_I(o[n]);
-               }
-       }
-}
-
-#undef SHR_I
-#define SHR_I(a) ((a) = (c?0x80000000L:0x00L)| ((a)>>1)) /* we use 32-bit words here */
-
-
-static void fp(uint32_t *o, uint32_t *i){
-       uint8_t c; // carry 
-       uint8_t n,m;
-       memset(o, 0, 16);
-       for(n=0; n<4; ++n){
-               for(m=0; m<8; ++m){
-               SHR_O(i[n]);
-               SHR_I(o[0]);
-               SHR_O(i[n]);
-               SHR_I(o[1]);
-               SHR_O(i[n]);
-               SHR_I(o[2]);
-               SHR_O(i[n]);
-               SHR_I(o[3]);
-               }
-       }
-}
-
-/******************************************************************************/
-
-static void sbox128x(uint8_t box, void* w){
-       uint8_t sb[16];
-       uint8_t i,t,x;
-       box &= 0x0f;
-       /* load sbox */
-       for(i=0; i<8; ++i){
-               t = pgm_read_byte(sbox + box*8 + i);
-               sb[2*i+0]=t>>4;
-               sb[2*i+1]=t&0xf;
-       }
-       uint8_t o[16];
-       ip(o, w);
-       
-       for(i=0; i<16; ++i){
-               t = ((uint8_t*)o)[i];
-               x = sb[t>>4];
-               x <<= 4;
-               x |= sb[t&0xf];
-               ((uint8_t*)o)[i] = x;
-       }
-       fp(w, (uint32_t*)o);
-}
-
-static void sbox128(void * w, uint8_t box){
-       sbox128x(box&0x7, w);
-}
-
-static void inv_sbox128(void * w, uint8_t box){
-       sbox128x(((box&0x7)|0x8), w);
-}
+#include "serpent-sboxes.h"
 
 /******************************************************************************/