/* des.c */
/*
- This file is part of the AVR-Crypto-Lib.
- Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
+ This file is part of the ARM-Crypto-Lib.
+ Copyright (C) 2006-2010 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
* \license GPLv3 or later
*
*/
-#include "config.h"
-#include "debug.h"
-#include "cli.h"
#include <stdint.h>
#include <string.h>
-#include <util/delay.h>
#include <avr/pgmspace.h>
-prog_uint8_t sbox[256] = {
+const uint8_t sbox[256] PROGMEM = {
/* S-box 1 */
0xE4, 0xD1, 0x2F, 0xB8, 0x3A, 0x6C, 0x59, 0x07,
0x0F, 0x74, 0xE2, 0xD1, 0xA6, 0xCB, 0x95, 0x38,
0x21, 0xE7, 0x4A, 0x8D, 0xFC, 0x90, 0x35, 0x6B
};
-prog_uint8_t e_permtab[] ={
+const uint8_t e_permtab[] PROGMEM = {
4, 6, /* 4 bytes in 6 bytes out*/
32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
28, 29, 30, 31, 32, 1
};
-prog_uint8_t p_permtab[] ={
+const uint8_t p_permtab[] PROGMEM = {
4, 4, /* 32 bit -> 32 bit */
16, 7, 20, 21,
29, 12, 28, 17,
22, 11, 4, 25
};
-prog_uint8_t ip_permtab[] ={
+const uint8_t ip_permtab[] PROGMEM = {
8, 8, /* 64 bit -> 64 bit */
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
63, 55, 47, 39, 31, 23, 15, 7
};
-prog_uint8_t inv_ip_permtab[] ={
+const uint8_t inv_ip_permtab[] PROGMEM = {
8, 8, /* 64 bit -> 64 bit */
40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
33, 1, 41, 9, 49, 17, 57, 25
};
-prog_uint8_t pc1_permtab[] ={
+const uint8_t pc1_permtab[] PROGMEM = {
8, 7, /* 64 bit -> 56 bit*/
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
21, 13, 5, 28, 20, 12, 4
};
-prog_uint8_t pc2_permtab[] ={
+const uint8_t pc2_permtab[] PROGMEM = {
7, 6, /* 56 bit -> 48 bit */
14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
46, 42, 50, 36, 29, 32
};
-prog_uint8_t splitin6bitword_permtab[] = {
+const uint8_t splitin6bitword_permtab[] PROGMEM = {
8, 8, /* 64 bit -> 64 bit */
64, 64, 1, 6, 2, 3, 4, 5,
64, 64, 7, 12, 8, 9, 10, 11,
64, 64, 43, 48, 44, 45, 46, 47
};
-prog_uint8_t shiftkey_permtab[] = {
+const uint8_t shiftkey_permtab[] PROGMEM = {
7, 7, /* 56 bit -> 56 bit */
2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17,
54, 55, 56, 29
};
-prog_uint8_t shiftkeyinv_permtab[] = {
+const uint8_t shiftkeyinv_permtab[] PROGMEM = {
7, 7,
28, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
#define ROTTABLE_INV 0x3F7E
/******************************************************************************/
-void permute(prog_uint8_t *ptable, const uint8_t *in, uint8_t *out){
- uint8_t ib, ob; /* in-bytes and out-bytes */
+void permute(const uint8_t *ptable, const uint8_t *in, uint8_t *out){
+ uint8_t ob; /* in-bytes and out-bytes */
uint8_t byte, bit; /* counter for bit and byte */
- ib = pgm_read_byte(&(ptable[0]));
- ob = pgm_read_byte(&(ptable[1]));
+ ob = pgm_read_byte(&ptable[1]);
ptable = &(ptable[2]);
for(byte=0; byte<ob; ++byte){
uint8_t x,t=0;
for(bit=0; bit<8; ++bit){
- x=pgm_read_byte(&(ptable[byte*8+bit])) -1 ;
- t<<=1;
+ x = pgm_read_byte(ptable++) -1 ;
+ t <<= 1;
if((in[x/8]) & (0x80>>(x%8)) ){
t|=0x01;
}
void shiftkey(uint8_t *key){
uint8_t k[7];
memcpy(k, key, 7);
- permute((prog_uint8_t*)shiftkey_permtab, k, key);
+ permute((uint8_t*)shiftkey_permtab, k, key);
}
/******************************************************************************/
void shiftkey_inv(uint8_t *key){
uint8_t k[7];
memcpy(k, key, 7);
- permute((prog_uint8_t*)shiftkeyinv_permtab, k, key);
+ permute((uint8_t*)shiftkeyinv_permtab, k, key);
}
uint64_t splitin6bitwords(uint64_t a){
uint64_t ret=0;
a &= 0x0000ffffffffffffLL;
- permute((prog_uint8_t*)splitin6bitword_permtab, (uint8_t*)&a, (uint8_t*)&ret);
+ permute((uint8_t*)splitin6bitword_permtab, (uint8_t*)&a, (uint8_t*)&ret);
return ret;
}
/******************************************************************************/
static inline
-uint8_t substitute(uint8_t a, prog_uint8_t * sbp){
+uint8_t substitute(uint8_t a, uint8_t * sbp){
uint8_t x;
- x = pgm_read_byte(&(sbp[a>>1]));
+ x = pgm_read_byte(&sbp[a>>1]);
x = (a&1)?x&0x0F:x>>4;
return x;
uint8_t i;
uint32_t t=0,ret;
uint64_t data;
- prog_uint8_t *sbp; /* sboxpointer */
- permute((prog_uint8_t*)e_permtab, (uint8_t*)&r, (uint8_t*)&data);
+ uint8_t *sbp; /* sboxpointer */
+ permute((uint8_t*)e_permtab, (uint8_t*)&r, (uint8_t*)&data);
for(i=0; i<7; ++i)
((uint8_t*)&data)[i] ^= kr[i];
/* Sbox substitution */
data = splitin6bitwords(data);
- sbp=(prog_uint8_t*)sbox;
+ sbp=(uint8_t*)sbox;
for(i=0; i<8; ++i){
uint8_t x;
x = substitute(((uint8_t*)&data)[i], sbp);
- t<<=4;
+ t <<= 4;
t |= x;
sbp += 32;
}
changeendian32(&t);
- permute((prog_uint8_t*)p_permtab,(uint8_t*)&t, (uint8_t*)&ret);
+ permute((uint8_t*)p_permtab,(uint8_t*)&t, (uint8_t*)&ret);
return ret;
}
/******************************************************************************/
void des_enc(void* out, const void* in, const void* key){
-#define R *((uint32_t*)&(data[4]))
-#define L *((uint32_t*)&(data[0]))
+#define R (data.v32[1])
+#define L (data.v32[0])
- uint8_t data[8],kr[6],k[7];
+ uint8_t kr[6],k[7];
uint8_t i;
+ union {
+ uint8_t v8[8];
+ uint32_t v32[2];
+ } data;
- permute((prog_uint8_t*)ip_permtab, (uint8_t*)in, data);
- permute((prog_uint8_t*)pc1_permtab, (uint8_t*)key, k);
+ permute((uint8_t*)ip_permtab, (uint8_t*)in, data.v8);
+ permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
for(i=0; i<8; ++i){
shiftkey(k);
if(ROTTABLE&((1<<((i<<1)+0))) )
shiftkey(k);
- permute((prog_uint8_t*)pc2_permtab, k, kr);
+ permute((uint8_t*)pc2_permtab, k, kr);
L ^= des_f(R, kr);
shiftkey(k);
if(ROTTABLE&((1<<((i<<1)+1))) )
shiftkey(k);
- permute((prog_uint8_t*)pc2_permtab, k, kr);
+ permute((uint8_t*)pc2_permtab, k, kr);
R ^= des_f(L, kr);
}
R ^= L;
L ^= R;
R ^= L;
-
- permute((prog_uint8_t*)inv_ip_permtab, data, (uint8_t*)out);
+ permute((uint8_t*)inv_ip_permtab, data.v8, (uint8_t*)out);
}
/******************************************************************************/
void des_dec(void* out, const void* in, const uint8_t* key){
-#define R *((uint32_t*)&(data[4]))
-#define L *((uint32_t*)&(data[0]))
-
- uint8_t data[8],kr[6],k[7];
+ uint8_t kr[6],k[7];
+ union {
+ uint8_t v8[8];
+ uint32_t v32[2];
+ } data;
int8_t i;
-
- permute((prog_uint8_t*)ip_permtab, (uint8_t*)in, data);
- permute((prog_uint8_t*)pc1_permtab, (uint8_t*)key, k);
+ permute((uint8_t*)ip_permtab, (uint8_t*)in, data.v8);
+ permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
for(i=7; i>=0; --i){
- permute((prog_uint8_t*)pc2_permtab, k, kr);
+ permute((uint8_t*)pc2_permtab, k, kr);
L ^= des_f(R, kr);
shiftkey_inv(k);
if(ROTTABLE&((1<<((i<<1)+1))) ){
shiftkey_inv(k);
}
- permute((prog_uint8_t*)pc2_permtab, k, kr);
+ permute((uint8_t*)pc2_permtab, k, kr);
R ^= des_f(L, kr);
shiftkey_inv(k);
if(ROTTABLE&((1<<((i<<1)+0))) ){
R ^= L;
L ^= R;
R ^= L;
-
- permute((prog_uint8_t*)inv_ip_permtab, data, (uint8_t*)out);
+ permute((uint8_t*)inv_ip_permtab, data.v8, (uint8_t*)out);
}
/******************************************************************************/
projects / avr-crypto-lib.git / blobdiff