/* cscipher_small_core.c */
/*
- This file is part of the ARM-Crypto-Lib.
- Copyright (C) 2006-2010 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
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
+ 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.
+ 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/>.
-*/
+ 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 <stdint.h>
#include <avr/pgmspace.h>
#if SBOX_PROG
static const uint8_t fg_table[] PROGMEM = {
- 0xfa, 0xd6, 0xb0, 0xb2, 0x7b, 0x5e, 0x71, 0x78,
- 0xed, 0xd4, 0xa5, 0xb3, 0xef, 0xdc, 0xe7, 0xf9
+ 0xfa, 0xd6, 0xb0, 0xb2, 0x7b, 0x5e, 0x71, 0x78,
+ 0xed, 0xd4, 0xa5, 0xb3, 0xef, 0xdc, 0xe7, 0xf9
};
static
-uint8_t p(uint8_t a){
- a ^= pgm_read_byte(fg_table+(a&0xf))&0xf0;
- a ^= pgm_read_byte(fg_table+(a>>4)) &0x0f;
- a ^= pgm_read_byte(fg_table+(a&0xf))&0xf0;
- return a;
+uint8_t p(uint8_t a) {
+ a ^= pgm_read_byte(fg_table+(a&0xf))&0xf0;
+ a ^= pgm_read_byte(fg_table+(a>>4)) &0x0f;
+ a ^= pgm_read_byte(fg_table+(a&0xf))&0xf0;
+ return a;
}
#define P(a) p(a)
#endif
static const uint8_t round_const[] PROGMEM = {
- 0xb7, 0xe1, 0x51, 0x62, 0x8a, 0xed, 0x2a, 0x6a,
- 0xbf, 0x71, 0x58, 0x80, 0x9c, 0xf4, 0xf3, 0xc7 };
+ 0xb7, 0xe1, 0x51, 0x62, 0x8a, 0xed, 0x2a, 0x6a,
+ 0xbf, 0x71, 0x58, 0x80, 0x9c, 0xf4, 0xf3, 0xc7 };
static const uint8_t ks_const[] PROGMEM = {
- 0x29,0x0d,0x61,0x40,0x9c,0xeb,0x9e,0x8f,
- 0x1f,0x85,0x5f,0x58,0x5b,0x01,0x39,0x86,
- 0x97,0x2e,0xd7,0xd6,0x35,0xae,0x17,0x16,
- 0x21,0xb6,0x69,0x4e,0xa5,0x72,0x87,0x08,
- 0x3c,0x18,0xe6,0xe7,0xfa,0xad,0xb8,0x89,
- 0xb7,0x00,0xf7,0x6f,0x73,0x84,0x11,0x63,
- 0x3f,0x96,0x7f,0x6e,0xbf,0x14,0x9d,0xac,
- 0xa4,0x0e,0x7e,0xf6,0x20,0x4a,0x62,0x30,
- 0x03,0xc5,0x4b,0x5a,0x46,0xa3,0x44,0x65
+ 0x29, 0x0d, 0x61, 0x40, 0x9c, 0xeb, 0x9e, 0x8f,
+ 0x1f, 0x85, 0x5f, 0x58, 0x5b, 0x01, 0x39, 0x86,
+ 0x97, 0x2e, 0xd7, 0xd6, 0x35, 0xae, 0x17, 0x16,
+ 0x21, 0xb6, 0x69, 0x4e, 0xa5, 0x72, 0x87, 0x08,
+ 0x3c, 0x18, 0xe6, 0xe7, 0xfa, 0xad, 0xb8, 0x89,
+ 0xb7, 0x00, 0xf7, 0x6f, 0x73, 0x84, 0x11, 0x63,
+ 0x3f, 0x96, 0x7f, 0x6e, 0xbf, 0x14, 0x9d, 0xac,
+ 0xa4, 0x0e, 0x7e, 0xf6, 0x20, 0x4a, 0x62, 0x30,
+ 0x03, 0xc5, 0x4b, 0x5a, 0x46, 0xa3, 0x44, 0x65
};
-static uint16_t m(uint16_t a){
- uint8_t xl, xr, yl, yr;
- uint16_t ret;
- xr = a>>8;
- xl = a&0xff;
- yl = (ROTL(xl)&0x55)^xl^xr;
- yr = ROTL(xl)^xr;
- ret = (P(yr)<<8)|P(yl);
- return ret;
+static uint16_t m(uint16_t a)
+{
+ uint8_t xl, xr, yl, yr;
+ uint16_t ret;
+ xr = a >> 8;
+ xl = a & 0xff;
+ yl = (ROTL(xl) & 0x55) ^ xl ^ xr;
+ yr = ROTL(xl) ^ xr;
+ ret = (P(yr) << 8) | P(yl);
+ return ret;
}
-static uint16_t m_inv(uint16_t a){
- uint8_t xl, xr;
- xr = P(a>>8);
- xl = P(a&0xff);
- xl ^= xr;
- xl ^= (ROTL(xl)&0xaa);
- xr ^= ROTL(xl);
- return (xr<<8)|xl;
+static uint16_t m_inv(uint16_t a)
+{
+ uint8_t xl, xr;
+ xr = P(a >> 8);
+ xl = P(a & 0xff);
+ xl ^= xr;
+ xl ^= (ROTL(xl) & 0xaa);
+ xr ^= ROTL(xl);
+ return (xr << 8) | xl;
}
-
-void cscipher_enc(void *buffer, const cscipher_ctx_t *ctx){
- uint8_t i,j,k;
- uint8_t tmp[8];
- for(i=0; i<8; ++i){
+void cscipher_enc(void *buffer, const cscipher_ctx_t *ctx)
+{
+ uint8_t i, j, k;
+ uint8_t tmp[8];
+ for (i = 0; i < 8; ++i) {
#if DEBUG
- cli_putstr_P(PSTR("\r\nDBG: round "));
- cli_hexdump(&i, 1);
- cli_putstr_P(PSTR(" buffer:"));
- cli_hexdump(buffer, 8);
+ cli_putstr_P(PSTR("\r\nDBG: round "));
+ cli_hexdump(&i, 1);
+ cli_putstr_P(PSTR(" buffer:"));
+ cli_hexdump(buffer, 8);
#endif
- for(j=0; j<3; ++j){
- if(j==0){
- memxor(buffer, ctx->keys[i], 8);
- }else{
- memxor_P(buffer, round_const+((j==1)?0:8), 8);
- }
- for(k=0; k<4; ++k){
- ((uint16_t*)tmp)[k] = m(((uint16_t*)buffer)[k]);
- }
- for(k=0; k<4; ++k){
- ((uint8_t*)buffer)[k] = tmp[2*k];
- ((uint8_t*)buffer)[k+4] = tmp[2*k+1];
- }
- }
- }
- memxor(buffer, ctx->keys[8], 8);
+ for (j = 0; j < 3; ++j) {
+ if (j == 0) {
+ memxor(buffer, ctx->keys[i], 8);
+ } else {
+ memxor_P(buffer, round_const + ((j == 1) ? 0 : 8), 8);
+ }
+ for (k = 0; k < 4; ++k) {
+ ((uint16_t*) tmp)[k] = m(((uint16_t*) buffer)[k]);
+ }
+ for (k = 0; k < 4; ++k) {
+ ((uint8_t*) buffer)[k] = tmp[2 * k];
+ ((uint8_t*) buffer)[k + 4] = tmp[2 * k + 1];
+ }
+ }
+ }
+ memxor(buffer, ctx->keys[8], 8);
}
-void cscipher_dec(void *buffer, const cscipher_ctx_t *ctx){
- uint8_t i=7,j,k;
- uint8_t tmp[8];
- memxor(buffer, ctx->keys[8], 8);
- do{
- for(j=0; j<3; ++j){
- for(k=0; k<4; ++k){
- tmp[2*k] = ((uint8_t*)buffer)[k];
- tmp[2*k+1] = ((uint8_t*)buffer)[4+k];
- }
- for(k=0; k<4; ++k){
- ((uint16_t*)buffer)[k] = m_inv(((uint16_t*)tmp)[k]);
- }
- if(j==2){
- memxor(buffer, ctx->keys[i], 8);
- }else{
- memxor_P(buffer, round_const+((j==1)?0:8), 8);
- }
-
- }
- }while(i--);
+void cscipher_dec(void *buffer, const cscipher_ctx_t *ctx)
+{
+ uint8_t i = 7, j, k;
+ uint8_t tmp[8];
+ memxor(buffer, ctx->keys[8], 8);
+ do {
+ for (j = 0; j < 3; ++j) {
+ for (k = 0; k < 4; ++k) {
+ tmp[2 * k] = ((uint8_t*) buffer)[k];
+ tmp[2 * k + 1] = ((uint8_t*) buffer)[4 + k];
+ }
+ for (k = 0; k < 4; ++k) {
+ ((uint16_t*) buffer)[k] = m_inv(((uint16_t*) tmp)[k]);
+ }
+ if (j == 2) {
+ memxor(buffer, ctx->keys[i], 8);
+ } else {
+ memxor_P(buffer, round_const + ((j == 1) ? 0 : 8), 8);
+ }
+
+ }
+ } while (i--);
}
-void cscipher_init(const void *key, cscipher_ctx_t *ctx){
- uint8_t tmp_key[16], tmp[8];
- uint8_t i,j,k,t=0;
- memcpy(tmp_key, key, 16);
- for(i=0; i<9; ++i){
+void cscipher_init(const void *key, cscipher_ctx_t *ctx)
+{
+ uint8_t tmp_key[16], tmp[8];
+ uint8_t i, j, k, t = 0;
+ memcpy(tmp_key, key, 16);
+ for (i = 0; i < 9; ++i) {
#if DEBUG
- cli_putstr_P(PSTR("\r\nDBG: round "));
- cli_hexdump(&i, 1);
- cli_putstr_P(PSTR(" key state:"));
- cli_hexdump(tmp_key, 16);
+ cli_putstr_P(PSTR("\r\nDBG: round "));
+ cli_hexdump(&i, 1);
+ cli_putstr_P(PSTR(" key state:"));
+ cli_hexdump(tmp_key, 16);
#endif
- memcpy(tmp, tmp_key+(((i&1)==0)?0:8), 8);
- memxor_P(tmp, ks_const+8*i, 8);
- for(j=0; j<8; ++j){
- tmp[j] = P(tmp[j]);
- }
- for(j=0; j<8; ++j){
- for(k=0; k<8; ++k){
- t<<=1;
- t |= tmp[k]>>7;
- tmp[k]<<=1;
- }
- tmp_key[j+(((i&1)==0)?8:0)] ^= t;
- }
- memcpy(ctx->keys[i], tmp_key+(((i&1)==0)?8:0), 8);
- }
+ memcpy(tmp, tmp_key + (((i & 1) == 0) ? 0 : 8), 8);
+ memxor_P(tmp, ks_const + 8 * i, 8);
+ for (j = 0; j < 8; ++j) {
+ tmp[j] = P(tmp[j]);
+ }
+ for (j = 0; j < 8; ++j) {
+ for (k = 0; k < 8; ++k) {
+ t <<= 1;
+ t |= tmp[k] >> 7;
+ tmp[k] <<= 1;
+ }
+ tmp_key[j + (((i & 1) == 0) ? 8 : 0)] ^= t;
+ }
+ memcpy(ctx->keys[i], tmp_key + (((i & 1) == 0) ? 8 : 0), 8);
+ }
}
projects / avr-crypto-lib.git / blobdiff