X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/8130eba4d127d1093f55334998f25230f0731a92..b87ad7964edcba3651f27a846a814358084478a7:/armsrc/crapto1.c

diff --git a/armsrc/crapto1.c b/armsrc/crapto1.c
index 627cce4f..e2058651 100644
--- a/armsrc/crapto1.c
+++ b/armsrc/crapto1.c
@@ -24,9 +24,9 @@
 static uint8_t filterlut[1 << 20];
 static void __attribute__((constructor)) fill_lut()
 {
-        uint32_t i;
-        for(i = 0; i < 1 << 20; ++i)
-                filterlut[i] = filter(i);
+	uint32_t i;
+	for(i = 0; i < 1 << 20; ++i)
+			filterlut[i] = filter(i);
 }
 #define filter(x) (filterlut[(x) & 0xfffff])
 #endif
@@ -419,10 +419,11 @@ static uint16_t *dist = 0;
 int nonce_distance(uint32_t from, uint32_t to)
 {
 	uint16_t x, i;
-	if(!dist) {
+	// generate distance lookup table
+	if (!dist) {
 		dist = malloc(2 << 16);
-		if(!dist)
-			return -1;
+		if (!dist) return -1;
+		
 		for (x = i = 1; i; ++i) {
 			dist[(x & 0xff) << 8 | x >> 8] = i;
 			x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15;
@@ -446,7 +447,7 @@ static uint32_t fastfwd[2][8] = {
  * encrypt the NACK which is observed when varying only the 3 last bits of Nr
  * only correct iff [NR_3] ^ NR_3 does not depend on Nr_3
  */
-uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd)
+uint32_t* lfsr_prefix_ks(uint8_t ks[8], int isodd)
 {
 	uint32_t *candidates = malloc(4 << 10);
 	if(!candidates) return 0;
@@ -509,7 +510,6 @@ static struct Crypto1State* check_pfx_parity(uint32_t prefix, uint32_t rresp, ui
  * It returns a zero terminated list of possible cipher states after the
  * tag nonce was fed in
  */
-
 struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8])
 {
 	struct Crypto1State *statelist, *s;
@@ -521,9 +521,8 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 	s = statelist = malloc((sizeof *statelist) << 21);
 	if(!s || !odd || !even) {
 		free(statelist);
-		free(odd);
-		free(even);
-		return 0;
+		statelist = 0;
+		goto out;
 	}
 
 	for(o = odd; *o + 1; ++o)
@@ -535,7 +534,7 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 			}
 
 	s->odd = s->even = 0;
-
+out:
 	free(odd);
 	free(even);
 	return statelist;