4 * email: daniel.otte@rub.de
14 #define S(i) ((((*ctx)[(i)/8])>>((i)%8))&1)
15 uint8_t trivium_enc(trivium_ctx_t* ctx){
22 t1 ^= (S(90) & S(91)) ^ S(170);
23 t2 ^= (S(174) & S(175)) ^ S(263);
24 t3 ^= (S(285) & S(286)) ^ S(68);
26 /* shift whole state and insert ts later */
30 (*ctx)[i] = (((*ctx)[i])<<1)|c1;
34 (*ctx)[0] = (((*ctx)[0])&0xFE)| t3; /* s0*/
35 (*ctx)[93/8] = (((*ctx)[93/8])& (~(1<<(93%8)))) | (t1<<(93%8)); /* s93 */
36 (*ctx)[177/8] = (((*ctx)[177/8])& (~(1<<(177%8)))) | (t2<<(177%8));/* s177 */
41 #define KEYSIZE_B ((keysize_b+7)/8)
42 #define IVSIZE_B ((ivsize_b +7)/8)
44 void trivium_init(const void* key, uint8_t keysize_b,
45 const void* iv, uint8_t ivsize_b,
50 memset((*ctx)+KEYSIZE_B, 0, 35-KEYSIZE_B);
51 memcpy((*ctx), key, KEYSIZE_B);
52 memcpy((*ctx)+12, iv, IVSIZE_B); /* iv0 is at s96, must shift to s93 */
54 for(i=12+IVSIZE_B; i>10; --i){
56 (*ctx)[i] = (((*ctx)[i])>>3)|c1;
61 for(i=0; i<4*288; ++i){