3 * email: daniel.otte@rub.de
12 #include <avr/pgmspace.h>
20 void gamma(uint32_t* a){
23 a[1] ^= ~((a[3]) | (a[2]));
26 tmp=a[3]; a[3]=a[0]; a[0]=tmp;
27 a[2] ^= a[0] ^ a[1] ^ a[3];
29 a[1] ^= ~((a[3]) | (a[2]));
33 #define ROTL32(a,n) (((a)<<n)|((a)>>(32-n)))
34 #define ROTR32(a,n) (((a)>>n)|((a)<<(32-n)))
37 void pi1(uint32_t* a){
38 a[1] = ROTL32(a[1], 1);
39 a[2] = ROTL32(a[2], 5);
40 a[3] = ROTL32(a[3], 2);
44 void pi2(uint32_t* a){
45 a[1] = ROTR32(a[1], 1);
46 a[2] = ROTR32(a[2], 5);
47 a[3] = ROTR32(a[3], 2);
51 void theta(uint32_t* k, uint32_t* a){
53 temp = a[0] ^ a[2]; temp ^= ROTR32(temp, 8) ^ ROTL32(temp, 8);
62 temp = a[1] ^ a[3]; temp ^= ROTR32(temp, 8) ^ ROTL32(temp, 8);
68 void noekeon_round(uint32_t* key, uint32_t* state, uint8_t const1, uint8_t const2){
69 ((uint8_t*)state)[RC_POS] ^= const1;
71 ((uint8_t*)state)[RC_POS] ^= const2;
77 uint8_t rc_tab[] PROGMEM = {
79 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,
80 0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,
84 0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91, 0x39,
85 0x72, 0xE4, 0xD3, 0xBD, 0x61, 0xC2, 0x9F, 0x25,
89 void changendian32(void* a){
90 ((uint8_t*)a)[0] ^= ((uint8_t*)a)[3];
91 ((uint8_t*)a)[3] ^= ((uint8_t*)a)[0];
92 ((uint8_t*)a)[0] ^= ((uint8_t*)a)[3];
94 ((uint8_t*)a)[1] ^= ((uint8_t*)a)[2];
95 ((uint8_t*)a)[2] ^= ((uint8_t*)a)[1];
96 ((uint8_t*)a)[1] ^= ((uint8_t*)a)[2];
100 void changendian(void* a){
101 changendian32((uint32_t*)(&(((uint32_t*)a)[0])));
102 changendian32((uint32_t*)(&(((uint32_t*)a)[1])));
103 changendian32((uint32_t*)(&(((uint32_t*)a)[2])));
104 changendian32((uint32_t*)(&(((uint32_t*)a)[3])));
107 /******************************************************************************/
109 void noekeon_enc(void* buffer, void* key){
116 for(i=0; i<ROUND_NR; ++i){
117 noekeon_round((uint32_t*)key, (uint32_t*)buffer, rc, 0);
118 rc = pgm_read_byte(rc_tab+i);
120 ((uint8_t*)buffer)[RC_POS] ^= rc;
121 theta((uint32_t*)key, (uint32_t*)buffer);
128 void noekeon_dec(void* buffer, void* key){
138 memset(nullv, 0, 16);
139 memcpy(dkey, key, 16);
141 theta((uint32_t*)nullv, (uint32_t*)dkey);
142 for(i=ROUND_NR-1; i>=0; --i){
143 rc = pgm_read_byte(rc_tab+i);
144 noekeon_round((uint32_t*)dkey, (uint32_t*)buffer, 0, rc);
146 theta((uint32_t*)dkey, (uint32_t*)buffer);
147 ((uint8_t*)buffer)[RC_POS] ^= 0x80;
153 void noekeon_init(void* key, noekeon_ctx_t* ctx){
156 memset(nullv, 0, 16);
157 memcpy(ctx, key, 16);
158 noekeon_enc(ctx, nullv);