forgotten files

[avr-crypto-lib.git] / bmw_large.c

diff --git a/bmw_large.c b/bmw_large.c
index 454c81a5a33d4b4605aab231fe9428b98d7bfbf5..10e65f6dabad5abb6c77153fee05a844d737aa9f 100644 (file)
--- a/bmw_large.c
+++ b/bmw_large.c
@@ -35,7 +35,7 @@
 #define ROTL64(a,n) (((a)<<(n))|((a)>>(64-(n))))
 #define ROTR64(a,n) (((a)>>(n))|((a)<<(64-(n))))
 
-#define BUG24 1
+#define BUG24 0
 #define F0_HACK 1
 #define DEBUG 0
 #if DEBUG
@@ -164,13 +164,25 @@ uint64_t bmw_large_r7(uint64_t x){
        r =   ROTR64(x, 64-53);
        return r;       
 }
-
-#define K 0x0555555555555555LL
+/*
+#define K    0x0555555555555555LL
+#define MASK 0xFFFFFFFFFFFFFFFFLL
+static
+uint64_t k_lut[] PROGMEM = {
+       16LL*K, 17LL*K, 18LL*K, 19LL*K, 
+       20LL*K, 21LL*K, 22LL*K, 23LL*K,
+       24LL*K, 25LL*K, 26LL*K, 27LL*K,
+       28LL*K, 29LL*K, 30LL*K, 31LL*K };
+*/     
+/* the same as above but precomputed to avoid compiler warnings */
 static
 uint64_t k_lut[] PROGMEM = {
-       16LL*K, 17LL*K, 18LL*K, 19LL*K, 20LL*K, 21LL*K, 22LL*K, 23LL*K,
-       24LL*K, 25LL*K, 26LL*K, 27LL*K, 28LL*K, 29LL*K, 30LL*K, 31LL*K };
-       
+       0x5555555555555550LL, 0x5aaaaaaaaaaaaaa5LL, 0x5ffffffffffffffaLL,
+       0x655555555555554fLL, 0x6aaaaaaaaaaaaaa4LL, 0x6ffffffffffffff9LL,
+       0x755555555555554eLL, 0x7aaaaaaaaaaaaaa3LL, 0x7ffffffffffffff8LL,
+       0x855555555555554dLL, 0x8aaaaaaaaaaaaaa2LL, 0x8ffffffffffffff7LL,
+       0x955555555555554cLL, 0x9aaaaaaaaaaaaaa1LL, 0x9ffffffffffffff6LL,
+       0xa55555555555554bLL };
 
 uint64_t bmw_large_expand1(uint8_t j, const uint64_t* q, const void* m){
        uint64_t(*s[])(uint64_t) = {bmw_large_s1, bmw_large_s2, bmw_large_s3, bmw_large_s0};
@@ -239,27 +251,29 @@ uint8_t f0_lut[] PROGMEM ={
 };
 
 void bmw_large_f0(uint64_t* q, uint64_t* h, const void* m){
-       uint8_t i,j=0,v,sign,l=4;
+       uint8_t i,j=-1,v,sign,l=0;
        uint64_t(*s[])(uint64_t)={ bmw_large_s0, bmw_large_s1, bmw_large_s2,
                                   bmw_large_s3, bmw_large_s4 };
        for(i=0; i<16; ++i){
                h[i] ^= ((uint64_t*)m)[i];
        }
        dump_x(h, 16, 'T');
-       memset(q, 0, 4*16);
+//     memset(q, 0, 4*16);
        for(i=0; i<5*16; ++i){
                v = pgm_read_byte(f0_lut+i);
                sign = v&1;
                v >>=1;
+               if(i==l){
+                       j++;
+                       l+=5;
+                       q[j] = h[v];
+                       continue;
+               }
                if(sign){
                        q[j] -= h[v];
                }else{
                        q[j] += h[v];
                }
-               if(i==l){
-                       j++;
-                       l+=5;
-               }
        }
        dump_x(q, 16, 'W');
        for(i=0; i<16; ++i){