#include <string.h>
#include "threefish.h"
-#define X0 (((uint64_t*)data)[0])
-#define X1 (((uint64_t*)data)[1])
-static
-void mix(void* data, uint8_t rot){
- uint64_t x;
- x = X1;
- X0 += x;
- X1 = ((x<<rot)|(x>>(64-rot))) ^ X0;
-}
-
#define X(a) (((uint64_t*)data)[(a)])
static
#define K(s) (((uint64_t*)key)[(s)])
#define T(s) (((uint64_t*)tweak)[(s)])
-void threefish1024_init(void* key, void* tweak, threefish1024_ctx_t* ctx){
+void threefish1024_init(const void* key, const void* tweak, threefish1024_ctx_t* ctx){
memcpy(ctx->k, key, 16*8);
memcpy(ctx->t, tweak, 2*8);
uint8_t i;
}
static
-void add_key_16(void* data, threefish1024_ctx_t* ctx, uint8_t s){
+void add_key_16(void* data, const threefish1024_ctx_t* ctx, uint8_t s){
uint8_t i;
for(i=0; i<13; ++i){
X(i) += ctx->k[(s+i)%17];
X(15) += ctx->k[(s+15)%17] + s;
}
-void threefish1024_enc(void* data, threefish1024_ctx_t* ctx){
+void threefish1024_enc(void* data, const threefish1024_ctx_t* ctx){
uint8_t i=0,s=0;
uint8_t r0[8] = {55, 25, 33, 34, 28, 17, 58, 47};
uint8_t r1[8] = {43, 25, 8, 43, 7, 6, 7, 49};
add_key_16(data, ctx, s);
++s;
}
- mix((uint8_t*)data + 0, r0[i%8]);
- mix((uint8_t*)data + 16, r1[i%8]);
- mix((uint8_t*)data + 32, r2[i%8]);
- mix((uint8_t*)data + 48, r3[i%8]);
- mix((uint8_t*)data + 64, r4[i%8]);
- mix((uint8_t*)data + 80, r5[i%8]);
- mix((uint8_t*)data + 96, r6[i%8]);
- mix((uint8_t*)data +112, r7[i%8]);
+ threefish_mix((uint8_t*)data + 0, r0[i%8]);
+ threefish_mix((uint8_t*)data + 16, r1[i%8]);
+ threefish_mix((uint8_t*)data + 32, r2[i%8]);
+ threefish_mix((uint8_t*)data + 48, r3[i%8]);
+ threefish_mix((uint8_t*)data + 64, r4[i%8]);
+ threefish_mix((uint8_t*)data + 80, r5[i%8]);
+ threefish_mix((uint8_t*)data + 96, r6[i%8]);
+ threefish_mix((uint8_t*)data +112, r7[i%8]);
permute_16(data);
++i;
}while(i!=80);