moving of A5/1

[avr-crypto-lib.git] / A5_1.c

diff --git a/A5_1.c b/A5_1.c
deleted file mode 100644 (file)
index a07b484..0000000
--- a/A5_1.c
+++ /dev/null
@@ -1,150 +0,0 @@
-/* A5_1.c */
-/*
-    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:        A5_1.c
- * Author:      Daniel Otte
- * email:       daniel.otte@rub.de
- * Date:        2006-06-24
- * License:     GPLv3 or later
- * Description: Implementation of the A5/1 stream cipher algorithm, as used in GSM.
- * ! Warning, this is weak crypto !
- * 
- */
- 
-#include <stdint.h>
-#include <string.h>
-#include "A5_1.h"
-#include <avr/pgmspace.h>
-
-uint8_t a5_1_clock_core(a5_1_ctx_t *c, uint8_t clockoverride);
-
-
-/*
- * length is length of key in bits!
- */
-
-void a5_1_init(a5_1_ctx_t *c, void* key, uint8_t keylength_b, void* iv, uint8_t ivlength_b){
-       uint8_t i,t;
-       memset(c->r1, 0, 3);
-       memset(c->r2, 0, 3);
-       memset(c->r3, 0, 3);
-       for(i=0; i<keylength_b; ++i){
-               t=((uint8_t*)key)[i/8];
-               t=1&(t>>i);
-               c->r1[0] ^= t;
-               c->r2[0] ^= t;
-               c->r3[0] ^= t;
-               a5_1_clock_core(c, 0x7);
-       }
-       for(i=0; i<ivlength_b; ++i){
-               t=((uint8_t*)iv)[i/8];
-               t=1&(t>>i);
-               c->r1[0] ^= t;
-               c->r2[0] ^= t;
-               c->r3[0] ^= t;
-               a5_1_clock_core(c, 0x7);
-       }
-       for(i=0; i<100; ++i)
-               a5_1_clock_core(c,0);
-}
-
-static
-void shiftreg(uint8_t* d){
-       uint8_t c, c2;
-       c=d[0]>>7;
-       d[0] <<= 1;
-       c2=d[1]>>7;
-       d[1] = (d[1]<<1) | c;
-       d[2] = (d[2]<<1) | c2;
-} 
-
-       uint8_t parity3_lut[] PROGMEM = {0, 1, 1, 0,
-                                            1, 0, 0, 1};       
-       uint8_t clock_lut[] PROGMEM =  {0x7, 0x6, 0x5, 0x3,
-                                           0x3, 0x5, 0x6, 0x7}; 
-                                           
-uint8_t a5_1_clock_core(a5_1_ctx_t *c, uint8_t clockoverride){
-       uint8_t ret,clk,fb;
-       ret = (0x04&c->r1[2]) | (0x20&c->r2[2]) | (0x40&c->r3[2]);
-       ret = ret^(ret>>6);
-       ret &= 0x7;
-       ret = pgm_read_byte(parity3_lut+ret);
-       clk = (0x08&c->r1[1]) | (0x10&c->r2[1]) | (0x20&c->r3[1]);
-       clk >>= 3;
-       clk = pgm_read_byte(clock_lut+clk);
-       clk |= clockoverride;
-       
-       if(clk&1){
-               fb = c->r1[2] ^ (1&((c->r1[1])>>5));
-               fb &= 0x7;
-               fb = pgm_read_byte(parity3_lut+fb);
-               shiftreg(c->r1);
-               c->r1[0] |= fb;
-               c->r1[2] &= 0x07;
-       }
-       clk>>=1;
-       if(clk&1){
-               fb = c->r2[2]>>4 ;
-               fb &= 0x7;
-               fb = pgm_read_byte(parity3_lut+fb);
-               shiftreg(c->r2);
-               c->r2[0] |= fb;
-               c->r2[2] &= 0x3F;
-       
-       }
-       clk>>=1;
-       if(clk&1){
-               fb = (c->r3[2]>>4) ^ (1&((c->r3[0])>>7));
-               fb &= 0x7;
-               fb = pgm_read_byte(parity3_lut+fb);
-               shiftreg(c->r3);
-               c->r3[0] |= fb;
-               c->r3[2] &= 0x7F;
-       }
-       return ret;
-}
-
-uint8_t a5_1_clock(a5_1_ctx_t *c){
-       return a5_1_clock_core(c, 0);
-}
-
-
-uint8_t a5_1_gen(a5_1_ctx_t *c){
-       uint8_t ret=0;
-       ret = a5_1_clock(c);
-       ret <<= 1;
-       ret = a5_1_clock(c);
-       ret <<= 1;
-       ret = a5_1_clock(c);
-       ret <<= 1;
-       ret = a5_1_clock(c);
-       ret <<= 1;
-       ret = a5_1_clock(c);
-       ret <<= 1;
-       ret = a5_1_clock(c);
-       ret <<= 1;
-       ret = a5_1_clock(c);
-       ret <<= 1;
-       ret = a5_1_clock(c);
-       return ret;
-}
-
-
-
-