2, 3, 4, 5, 3, 5, 7, 2
};
+
+static const uint8_t p_shifts[] PROGMEM = {
+ 0, 1, 2, 3, 4, 5, 6, 7
+};
+
+static const uint8_t q_shifts[] PROGMEM = {
+ 1, 3, 5, 7, 0, 2, 4, 6
+};
+
+
+static
+void shift_columns(uint8_t *a, PGM_VOID_P shifts){
+ uint8_t s;
+ uint8_t tmp[8];
+ uint8_t i,j;
+ for(i=0; i<8; ++i){
+ s = pgm_read_byte(shifts);
+ shifts = (uint8_t*)shifts + 1;
+ if(s==0){
+ continue;
+ }
+ for(j=0;j<8;++j){
+ tmp[j] = a[i+j*8];
+ }
+ for(j=0; j<8; ++j){
+ a[i+((j-s+8)%8)*8] = tmp[j];
+ }
+ }
+}
+
+
+
void groestl_small_rounds(uint8_t *m, uint8_t q){
uint8_t r,i,j;
uint8_t tmp[8];
+#if DEBUG
+ cli_putstr_P(PSTR("\r\n:: BEGIN "));
+ cli_putc(q?'Q':'P');
+#endif
+
for(r=0; r<ROUNDS; ++r){
if(q){
- m[7] ^= 0xff ^ r;
+ for(i=0; i<8*8; ++i){
+ m[i] ^= 0xff;
+ }
+ for(i=0; i<8; ++i){
+ m[7+i*8] ^= r ^ (i<<4);
+ }
}else{
- m[0] ^= r;
+ for(i=0; i<8; ++i){
+ m[i*8] ^= r ^ (i<<4);
+ }
}
#if DEBUG
- if(r<2){
+ // if(r<2){
cli_putstr_P(PSTR("\r\npost add-const"));
dump_m(m);
- }
+ // }
#endif
for(i=0;i<8*8; ++i){
m[i] = pgm_read_byte(aes_sbox+m[i]);
}
- for(i=1; i<8; ++i){
- for(j=0; j<8; ++j)
- tmp[j] = m[i+8*j];
- for(j=0; j<8; ++j){
- m[i+((j-i+8)%8)*8] = tmp[j];
- }
+ if(!q){
+ shift_columns(m, p_shifts);
+ }else{
+ shift_columns(m, q_shifts);
}
#if DEBUG
if(r<2){