X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a0f33b6682db1fc4ab60504f11e99eb682dc9c56..1e2bb9c9f43872bfe13f5b6c06f0af2bec1eedd4:/client/nonce2key/crapto1.c

diff --git a/client/nonce2key/crapto1.c b/client/nonce2key/crapto1.c
index 4ecc5943..c17cea7a 100644
--- a/client/nonce2key/crapto1.c
+++ b/client/nonce2key/crapto1.c
@@ -24,56 +24,17 @@
 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
 
-static void quicksort(uint32_t* const start, uint32_t* const stop)
-{
-	uint32_t *it = start + 1, *rit = stop, t;
-
-	if(it > rit)
-		return;
-
-	while(it < rit)
-		if(*it <= *start)
-			++it;
-		else if(*rit > *start)
-			--rit;
-		else
-			t = *it,  *it = *rit, *rit = t;
-
-	if(*rit >= *start)
-		--rit;
-	if(rit != start)
-		t = *rit,  *rit = *start, *start = t;
-
-	quicksort(start, rit - 1);
-	quicksort(rit + 1, stop);
-}
-/** binsearch
- * Binary search for the first occurence of *stop's MSB in sorted [start,stop]
- */
-static inline uint32_t* binsearch(uint32_t *start, uint32_t *stop)
-{
-	uint32_t mid, val = *stop & 0xff000000;
-	while(start != stop)
-		if(start[mid = (stop - start) >> 1] > val)
-			stop = &start[mid];
-		else
-			start += mid + 1;
-
-	return start;
-}
-
 /** update_contribution
  * helper, calculates the partial linear feedback contributions and puts in MSB
  */
-static inline void
-update_contribution(uint32_t *item, const uint32_t mask1, const uint32_t mask2)
+static inline void update_contribution(uint32_t *item, const uint32_t mask1, const uint32_t mask2)
 {
 	uint32_t p = *item >> 25;
 
@@ -85,8 +46,7 @@ update_contribution(uint32_t *item, const uint32_t mask1, const uint32_t mask2)
 /** extend_table
  * using a bit of the keystream extend the table of possible lfsr states
  */
-static inline void
-extend_table(uint32_t *tbl, uint32_t **end, int bit, int m1, int m2, uint32_t in)
+static inline void extend_table(uint32_t *tbl, uint32_t **end, int bit, int m1, int m2, uint32_t in)
 {
 	in <<= 24;
 	for(*tbl <<= 1; tbl <= *end; *++tbl <<= 1)
@@ -109,26 +69,27 @@ extend_table(uint32_t *tbl, uint32_t **end, int bit, int m1, int m2, uint32_t in
  */
 static inline void extend_table_simple(uint32_t *tbl, uint32_t **end, int bit)
 {
-	for(*tbl <<= 1; tbl <= *end; *++tbl <<= 1)
+	for(*tbl <<= 1; tbl <= *end; *++tbl <<= 1) {
 		if(filter(*tbl) ^ filter(*tbl | 1)) {	// replace
 			*tbl |= filter(*tbl) ^ bit;
 		} else if(filter(*tbl) == bit) {		// insert
 			*++*end = *++tbl;
 			*tbl = tbl[-1] | 1;
-		} else									// drop
+		} else	{								// drop
 			*tbl-- = *(*end)--;
+		}
+	}
 }
-
-
 /** recover
  * recursively narrow down the search space, 4 bits of keystream at a time
  */
 static struct Crypto1State*
 recover(uint32_t *o_head, uint32_t *o_tail, uint32_t oks,
 	uint32_t *e_head, uint32_t *e_tail, uint32_t eks, int rem,
-	struct Crypto1State *sl, uint32_t in)
+	struct Crypto1State *sl, uint32_t in, bucket_array_t bucket)
 {
-	uint32_t *o, *e, i;
+	uint32_t *o, *e;
+	bucket_info_t bucket_info;
 
 	if(rem == -1) {
 		for(e = e_head; e <= e_tail; ++e) {
@@ -142,35 +103,26 @@ recover(uint32_t *o_head, uint32_t *o_tail, uint32_t oks,
 		return sl;
 	}
 
-	for(i = 0; i < 4 && rem--; i++) {
+	for(uint32_t i = 0; i < 4 && rem--; i++) {
 		oks >>= 1;
 		eks >>= 1;
 		in >>= 2;
-		extend_table(o_head, &o_tail, oks & 1, LF_POLY_EVEN << 1 | 1,
-			     LF_POLY_ODD << 1, 0);
+		extend_table(o_head, &o_tail, oks & 1, LF_POLY_EVEN << 1 | 1, LF_POLY_ODD << 1, 0);
 		if(o_head > o_tail)
 			return sl;
 
-		extend_table(e_head, &e_tail, eks & 1, LF_POLY_ODD,
-			     LF_POLY_EVEN << 1 | 1, in & 3);
+		extend_table(e_head, &e_tail, eks & 1, LF_POLY_ODD, LF_POLY_EVEN << 1 | 1, in & 3);
 		if(e_head > e_tail)
 			return sl;
 	}
 
-	quicksort(o_head, o_tail);
-	quicksort(e_head, e_tail);
+	bucket_sort_intersect(e_head, e_tail, o_head, o_tail, &bucket_info, bucket);
 
-	while(o_tail >= o_head && e_tail >= e_head)
-		if(((*o_tail ^ *e_tail) >> 24) == 0) {
-			o_tail = binsearch(o_head, o = o_tail);
-			e_tail = binsearch(e_head, e = e_tail);
-			sl = recover(o_tail--, o, oks,
-				     e_tail--, e, eks, rem, sl, in);
+	for (int i = bucket_info.numbuckets - 1; i >= 0; i--) {
+		sl = recover(bucket_info.bucket_info[1][i].head, bucket_info.bucket_info[1][i].tail, oks,
+					 bucket_info.bucket_info[0][i].head, bucket_info.bucket_info[0][i].tail, eks,
+					 rem, sl, in, bucket);
 	}
-		else if(*o_tail > *e_tail)
-			o_tail = binsearch(o_head, o_tail) - 1;
-		else
-			e_tail = binsearch(e_head, e_tail) - 1;
 
 	return sl;
 }
@@ -203,6 +155,18 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in)
 
 	statelist->odd = statelist->even = 0;
 
+	// allocate memory for out of place bucket_sort
+	bucket_array_t bucket;
+	
+	for (uint32_t i = 0; i < 2; i++) {
+		for (uint32_t j = 0; j <= 0xff; j++) {
+			bucket[i][j].head = malloc(sizeof(uint32_t)<<14);
+			if (!bucket[i][j].head) {
+				 goto out;
+			}
+		}
+	}
+
 	// initialize statelists: add all possible states which would result into the rightmost 2 bits of the keystream
 	for(i = 1 << 20; i >= 0; --i) {
 		if(filter(i) == (oks & 1))
@@ -220,17 +184,19 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in)
 	// the statelists now contain all states which could have generated the last 10 Bits of the keystream.
 	// 22 bits to go to recover 32 bits in total. From now on, we need to take the "in"
 	// parameter into account.
-	in = (in >> 16 & 0xff) | (in << 16) | (in & 0xff00);
-	recover(odd_head, odd_tail, oks,
-		even_head, even_tail, eks, 11, statelist, in << 1);
+	in = (in >> 16 & 0xff) | (in << 16) | (in & 0xff00);		// Byte swapping
+	recover(odd_head, odd_tail, oks, even_head, even_tail, eks, 11, statelist, in << 1, bucket);
 
 out:
+	for (uint32_t i = 0; i < 2; i++)
+		for (uint32_t j = 0; j <= 0xff; j++)
+			free(bucket[i][j].head);
 	free(odd_head);
 	free(even_head);
 	return statelist;
 }
 
-static const uint32_t S1[] = {     0x62141, 0x310A0, 0x18850, 0x0C428, 0x06214,
+static const uint32_t S1[] = { 0x62141, 0x310A0, 0x18850, 0x0C428, 0x06214,
 	0x0310A, 0x85E30, 0xC69AD, 0x634D6, 0xB5CDE, 0xDE8DA, 0x6F46D, 0xB3C83,
 	0x59E41, 0xA8995, 0xD027F, 0x6813F, 0x3409F, 0x9E6FA};
 static const uint32_t S2[] = {  0x3A557B00, 0x5D2ABD80, 0x2E955EC0, 0x174AAF60,
@@ -417,7 +383,7 @@ uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb)
 /** nonce_distance
  * x,y valid tag nonces, then prng_successor(x, nonce_distance(x, y)) = y
  */
-static uint16_t *dist = 0;
+static uint16_t *dist;
 int nonce_distance(uint32_t from, uint32_t to)
 {
 	uint16_t x, i;
@@ -425,7 +391,7 @@ int nonce_distance(uint32_t from, uint32_t to)
 		dist = malloc(2 << 16);
 		if(!dist)
 			return -1;
-		for (x = i = 1; i; ++i) {
+		for (x = 1, i = 1; i; ++i) {
 			dist[(x & 0xff) << 8 | x >> 8] = i;
 			x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15;
 		}
@@ -501,6 +467,24 @@ static struct Crypto1State* check_pfx_parity(uint32_t prefix, uint32_t rresp, ui
 
 	return sl + good;
 }
+static struct Crypto1State* check_pfx_parity_ex(uint32_t prefix, uint32_t odd, uint32_t even, struct Crypto1State* sl) {
+	struct Crypto1State s;
+	uint32_t c = 0;
+
+	s.odd = odd ^ fastfwd[1][c];
+	s.even = even ^ fastfwd[0][c];
+	
+	lfsr_rollback_bit(&s, 0, 0);
+	lfsr_rollback_bit(&s, 0, 0);
+	lfsr_rollback_bit(&s, 0, 0);
+	
+	lfsr_rollback_word(&s, 0, 0);
+	lfsr_rollback_word(&s, prefix | c << 5, 1);
+	
+	sl->odd = s.odd;
+	sl->even = s.even;
+	return ++sl;
+}
 
 /** lfsr_common_prefix
  * Implentation of the common prefix attack.
@@ -523,9 +507,8 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 	s = statelist = malloc((sizeof *statelist) << 20);
 	if(!s || !odd || !even) {
 		free(statelist);
-		free(odd);
-		free(even);
-		return 0;
+		statelist = 0;
+		goto out;
 	}
 
 	for(o = odd; *o + 1; ++o)
@@ -537,8 +520,45 @@ 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;
+}
+
+struct Crypto1State* lfsr_common_prefix_ex(uint32_t pfx, uint8_t ks[8])
+{
+	struct Crypto1State *statelist, *s;
+	uint32_t *odd, *even, *o, *e, top;
+
+	odd = lfsr_prefix_ks(ks, 1);
+	even = lfsr_prefix_ks(ks, 0);
 
+	s = statelist = malloc((sizeof *statelist) << 20);
+	if(!s || !odd || !even) {
+		free(statelist);
+		statelist = 0;
+		goto out;
+	}
+
+	// for(o = odd; *o + 1; ++o)
+		// for(e = even; *e + 1; ++e)
+			// for(top = 0; top < 64; ++top) {
+				// *o += 1 << 21;
+				// *e += (!(top & 7) + 1) << 21;
+				// s = check_pfx_parity_ex(pfx, *o, *e, s);
+			// }
+	for(o = odd; *o != -1; ++o)
+		for(e = even; *e != -1; ++e)
+			for(top = 0; top < 64; ++top) {
+				*o = (*o & 0x1fffff) | (top << 21);
+				*e = (*e & 0x1fffff) | (top >> 3) << 21;
+				s = check_pfx_parity_ex(pfx, *o, *e, s);
+			}
+
+	s->odd = s->even = -1;	
+out:
 	free(odd);
 	free(even);
 	return statelist;
-}
\ No newline at end of file
+}