From 8130eba4d127d1093f55334998f25230f0731a92 Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Tue, 19 Jan 2016 18:01:16 +0100
Subject: [PATCH] CHG: Syncronized so all different parts uses the same
 implementation of Crapto1 v3.3

---
 armsrc/crapto1.c             | 31 ++++++++++++++++---------------
 armsrc/crapto1.h             |  5 ++---
 client/nonce2key/crapto1.c   |  2 +-
 client/nonce2key/crapto1.h   |  3 +--
 client/nonce2key/nonce2key.c |  1 +
 tools/mfkey/crapto1.c        | 17 +++++++----------
 tools/mfkey/crapto1.h        |  3 +--
 tools/mfkey/crypto1.c        |  3 ++-
 tools/nonce2key/crapto1.c    | 17 +++++++----------
 tools/nonce2key/crapto1.h    |  4 +---
 tools/nonce2key/crypto1.c    |  3 ++-
 11 files changed, 41 insertions(+), 48 deletions(-)

diff --git a/armsrc/crapto1.c b/armsrc/crapto1.c
index 4b4e240e..627cce4f 100644
--- a/armsrc/crapto1.c
+++ b/armsrc/crapto1.c
@@ -15,7 +15,7 @@
     Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA  02110-1301, US$
 
-    Copyright (C) 2008-2008 bla <blapost@gmail.com>
+    Copyright (C) 2008-2014 bla <blapost@gmail.com>
 */
 #include "crapto1.h"
 #include <stdlib.h>
@@ -85,7 +85,8 @@ 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)
@@ -183,6 +184,7 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in)
 	uint32_t *even_head = 0, *even_tail = 0, eks = 0;
 	int i;
 
+	// split the keystream into an odd and even part
 	for(i = 31; i >= 0; i -= 2)
 		oks = oks << 1 | BEBIT(ks2, i);
 	for(i = 30; i >= 0; i -= 2)
@@ -199,6 +201,7 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in)
 
 	statelist->odd = statelist->even = 0;
 
+	// 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))
 			*++odd_tail = i;
@@ -206,11 +209,15 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in)
 			*++even_tail = i;
 	}
 
+	// extend the statelists. Look at the next 8 Bits of the keystream (4 Bit each odd and even):
 	for(i = 0; i < 4; i++) {
 		extend_table_simple(odd_head,  &odd_tail, (oks >>= 1) & 1);
 		extend_table_simple(even_head, &even_tail, (eks >>= 1) & 1);
 	}
 
+	// 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);
@@ -439,16 +446,14 @@ 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
  */
- // TO VERIFY 
 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd)
 {
 	uint32_t *candidates = malloc(4 << 10);
+	if(!candidates) return 0;
+	
 	uint32_t c,  entry;
 	int size = 0, i, good;
 
-	if(!candidates)
-		return 0;
-
 	for(i = 0; i < 1 << 21; ++i) {
 		for(c = 0, good = 1; good && c < 8; ++c) {
 			entry = i ^ fastfwd[isodd][c];
@@ -467,9 +472,7 @@ uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd)
 /** check_pfx_parity
  * helper function which eliminates possible secret states using parity bits
  */
-static struct Crypto1State*
-check_pfx_parity(uint32_t prefix, uint32_t rresp, uint8_t parities[8][8],
-          	uint32_t odd, uint32_t even, struct Crypto1State* sl)
+static struct Crypto1State* check_pfx_parity(uint32_t prefix, uint32_t rresp, uint8_t parities[8][8], uint32_t odd, uint32_t even, struct Crypto1State* sl)
 {
 	uint32_t ks1, nr, ks2, rr, ks3, c, good = 1;
 
@@ -497,7 +500,6 @@ check_pfx_parity(uint32_t prefix, uint32_t rresp, uint8_t parities[8][8],
 	return sl + good;
 }
 
-
 /** lfsr_common_prefix
  * Implentation of the common prefix attack.
  * Requires the 28 bit constant prefix used as reader nonce (pfx)
@@ -507,8 +509,8 @@ check_pfx_parity(uint32_t prefix, uint32_t rresp, uint8_t parities[8][8],
  * 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* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8])
 {
 	struct Crypto1State *statelist, *s;
 	uint32_t *odd, *even, *o, *e, top;
@@ -516,7 +518,7 @@ lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8])
 	odd = lfsr_prefix_ks(ks, 1);
 	even = lfsr_prefix_ks(ks, 0);
 	
-	s = statelist = malloc((sizeof *statelist) << 20);
+	s = statelist = malloc((sizeof *statelist) << 21);
 	if(!s || !odd || !even) {
 		free(statelist);
 		free(odd);
@@ -536,6 +538,5 @@ lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8])
 
 	free(odd);
 	free(even);
-
 	return statelist;
-}
+}
\ No newline at end of file
diff --git a/armsrc/crapto1.h b/armsrc/crapto1.h
index 50654db9..9262b956 100644
--- a/armsrc/crapto1.h
+++ b/armsrc/crapto1.h
@@ -36,8 +36,7 @@ uint32_t prng_successor(uint32_t x, uint32_t n);
 struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
 struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
-struct Crypto1State*
-lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
+struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
 
 uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
 uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
@@ -69,7 +68,7 @@ static inline int parity(uint32_t x)
 	x ^= x >> 4;
 	return BIT(0x6996, x & 0xf);
 #else
-        asm(    "movl %1, %%eax\n"
+	__asm__(	"movl %1, %%eax\n"
 		"mov %%ax, %%cx\n"
 		"shrl $0x10, %%eax\n"
 		"xor %%ax, %%cx\n"
diff --git a/client/nonce2key/crapto1.c b/client/nonce2key/crapto1.c
index 4ecc5943..8754c3c9 100644
--- a/client/nonce2key/crapto1.c
+++ b/client/nonce2key/crapto1.c
@@ -520,7 +520,7 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 	odd = lfsr_prefix_ks(ks, 1);
 	even = lfsr_prefix_ks(ks, 0);
 
-	s = statelist = malloc((sizeof *statelist) << 20);
+	s = statelist = malloc((sizeof *statelist) << 21);
 	if(!s || !odd || !even) {
 		free(statelist);
 		free(odd);
diff --git a/client/nonce2key/crapto1.h b/client/nonce2key/crapto1.h
index c5e2ea0a..a1094e3f 100644
--- a/client/nonce2key/crapto1.h
+++ b/client/nonce2key/crapto1.h
@@ -37,7 +37,6 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
 struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
 struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
-struct Crypto1State* lfsr_common_prefix_ex(uint32_t pfx, uint8_t ks[8], uint8_t par[8][8]);
 
 uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
 uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
@@ -69,7 +68,7 @@ static inline int parity(uint32_t x)
 	x ^= x >> 4;
 	return BIT(0x6996, x & 0xf);
 #else
-	__asm__(	"movl %1, %%eax\n"
+        __asm__(    "movl %1, %%eax\n"
 			"mov %%ax, %%cx\n"
 			"shrl $0x10, %%eax\n"
 			"xor %%ax, %%cx\n"
diff --git a/client/nonce2key/nonce2key.c b/client/nonce2key/nonce2key.c
index 99ede9e0..b0f2c93d 100644
--- a/client/nonce2key/nonce2key.c
+++ b/client/nonce2key/nonce2key.c
@@ -59,6 +59,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
 	state = lfsr_common_prefix(nr, rr, ks3x, par);
 	lfsr_rollback_word(state, uid^nt, 0);
 	crypto1_get_lfsr(state, key);
+    printf("\nkey recovered: %012"llx"\n\n",key);
 	crypto1_destroy(state);
 	return 0;
 }
diff --git a/tools/mfkey/crapto1.c b/tools/mfkey/crapto1.c
index 995d0069..04d48d20 100755
--- a/tools/mfkey/crapto1.c
+++ b/tools/mfkey/crapto1.c
@@ -349,7 +349,7 @@ uint8_t lfsr_rollback_byte(struct Crypto1State *s, uint32_t in, int fb)
 	for (i = 7; i >= 0; --i)
 		ret |= lfsr_rollback_bit(s, BIT(in, i), fb) << i;
 */
-
+// unfold loop 20160112
 	uint8_t ret = 0;
 	ret |= lfsr_rollback_bit(s, BIT(in, 7), fb) << 7;
 	ret |= lfsr_rollback_bit(s, BIT(in, 6), fb) << 6;
@@ -372,7 +372,7 @@ uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb)
 	for (i = 31; i >= 0; --i)
 		ret |= lfsr_rollback_bit(s, BEBIT(in, i), fb) << (i ^ 24);
 */
-	
+// unfold loop 20160112
 	uint32_t ret = 0;
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 31), fb) << (31 ^ 24);
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 30), fb) << (30 ^ 24);
@@ -409,7 +409,6 @@ uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb)
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 2), fb) << (2 ^ 24);
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 1), fb) << (1 ^ 24);
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 0), fb) << (0 ^ 24);
-	
 	return ret;
 }
 
@@ -450,12 +449,11 @@ static uint32_t fastfwd[2][8] = {
 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd)
 {
 	uint32_t *candidates = malloc(4 << 10);
+	if(!candidates) return 0;
+	
 	uint32_t c,  entry;
 	int size = 0, i, good;
 
-	if(!candidates)
-		return 0;
-
 	for(i = 0; i < 1 << 21; ++i) {
 		for(c = 0, good = 1; good && c < 8; ++c) {
 			entry = i ^ fastfwd[isodd][c];
@@ -502,7 +500,6 @@ static struct Crypto1State* check_pfx_parity(uint32_t prefix, uint32_t rresp, ui
 	return sl + good;
 } 
 
-
 /** lfsr_common_prefix
  * Implentation of the common prefix attack.
  * Requires the 28 bit constant prefix used as reader nonce (pfx)
@@ -512,6 +509,7 @@ 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;
@@ -520,7 +518,7 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 	odd = lfsr_prefix_ks(ks, 1);
 	even = lfsr_prefix_ks(ks, 0);
 
-	s = statelist = malloc((sizeof *statelist) << 20);
+	s = statelist = malloc((sizeof *statelist) << 21);
 	if(!s || !odd || !even) {
 		free(statelist);
 		free(odd);
@@ -540,6 +538,5 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 
 	free(odd);
 	free(even);
-
 	return statelist;
-}
+}
\ No newline at end of file
diff --git a/tools/mfkey/crapto1.h b/tools/mfkey/crapto1.h
index a7483d72..555de2fe 100755
--- a/tools/mfkey/crapto1.h
+++ b/tools/mfkey/crapto1.h
@@ -36,8 +36,7 @@ uint32_t prng_successor(uint32_t x, uint32_t n);
 struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
 struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
-struct Crypto1State*
-lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
+struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
 
 uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
 uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
diff --git a/tools/mfkey/crypto1.c b/tools/mfkey/crypto1.c
index f4554605..d15a40e3 100755
--- a/tools/mfkey/crypto1.c
+++ b/tools/mfkey/crypto1.c
@@ -69,7 +69,7 @@ uint8_t crypto1_byte(struct Crypto1State *s, uint8_t in, int is_encrypted)
 	for (i = 0; i < 8; ++i)
 		ret |= crypto1_bit(s, BIT(in, i), is_encrypted) << i;
 	*/
-	// unfold loop
+// unfold loop 20161012
 	uint8_t ret = 0;
 	ret |= crypto1_bit(s, BIT(in, 0), is_encrypted) << 0;
 	ret |= crypto1_bit(s, BIT(in, 1), is_encrypted) << 1;
@@ -89,6 +89,7 @@ uint32_t crypto1_word(struct Crypto1State *s, uint32_t in, int is_encrypted)
 	for (i = 0; i < 32; ++i)
 		ret |= crypto1_bit(s, BEBIT(in, i), is_encrypted) << (i ^ 24);
 */
+//unfold loop 2016012
 	uint32_t ret = 0;
 	ret |= crypto1_bit(s, BEBIT(in, 0), is_encrypted) << (0 ^ 24);
 	ret |= crypto1_bit(s, BEBIT(in, 1), is_encrypted) << (1 ^ 24);
diff --git a/tools/nonce2key/crapto1.c b/tools/nonce2key/crapto1.c
index 10dedcb5..ca2a30da 100644
--- a/tools/nonce2key/crapto1.c
+++ b/tools/nonce2key/crapto1.c
@@ -349,7 +349,7 @@ uint8_t lfsr_rollback_byte(struct Crypto1State *s, uint32_t in, int fb)
 	for (i = 7; i >= 0; --i)
 		ret |= lfsr_rollback_bit(s, BIT(in, i), fb) << i;
 */
-
+// unfold loop 20160112
 	uint8_t ret = 0;
 	ret |= lfsr_rollback_bit(s, BIT(in, 7), fb) << 7;
 	ret |= lfsr_rollback_bit(s, BIT(in, 6), fb) << 6;
@@ -372,7 +372,7 @@ uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb)
 	for (i = 31; i >= 0; --i)
 		ret |= lfsr_rollback_bit(s, BEBIT(in, i), fb) << (i ^ 24);
 */
-	
+// unfold loop 20160112
 	uint32_t ret = 0;
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 31), fb) << (31 ^ 24);
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 30), fb) << (30 ^ 24);
@@ -409,7 +409,6 @@ uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb)
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 2), fb) << (2 ^ 24);
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 1), fb) << (1 ^ 24);
 	ret |= lfsr_rollback_bit(s, BEBIT(in, 0), fb) << (0 ^ 24);
-	
 	return ret;
 }
 
@@ -450,12 +449,11 @@ static uint32_t fastfwd[2][8] = {
 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd)
 {
 	uint32_t *candidates = malloc(4 << 10);
+	if(!candidates) return 0;
+	
 	uint32_t c,  entry;
 	int size = 0, i, good;
 
-	if(!candidates)
-		return 0;
-
 	for(i = 0; i < 1 << 21; ++i) {
 		for(c = 0, good = 1; good && c < 8; ++c) {
 			entry = i ^ fastfwd[isodd][c];
@@ -502,7 +500,6 @@ static struct Crypto1State* check_pfx_parity(uint32_t prefix, uint32_t rresp, ui
 	return sl + good;
 } 
 
-
 /** lfsr_common_prefix
  * Implentation of the common prefix attack.
  * Requires the 28 bit constant prefix used as reader nonce (pfx)
@@ -512,6 +509,7 @@ 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;
@@ -520,7 +518,7 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 	odd = lfsr_prefix_ks(ks, 1);
 	even = lfsr_prefix_ks(ks, 0);
 
-	s = statelist = malloc((sizeof *statelist) << 20);
+	s = statelist = malloc((sizeof *statelist) << 21);
 	if(!s || !odd || !even) {
 		free(statelist);
 		free(odd);
@@ -540,6 +538,5 @@ struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8]
 
 	free(odd);
 	free(even);
-
 	return statelist;
-}
+}
\ No newline at end of file
diff --git a/tools/nonce2key/crapto1.h b/tools/nonce2key/crapto1.h
index cc49b2e6..d3a71eb0 100644
--- a/tools/nonce2key/crapto1.h
+++ b/tools/nonce2key/crapto1.h
@@ -37,8 +37,6 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
 struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
 struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
-struct Crypto1State* lfsr_common_prefix_ex(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
-
 
 uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
 uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
@@ -70,7 +68,7 @@ static inline int parity(uint32_t x)
 	x ^= x >> 4;
 	return BIT(0x6996, x & 0xf);
 #else
-	__asm__(	"movl %1, %%eax\n"
+        __asm__(    "movl %1, %%eax\n"
 		"mov %%ax, %%cx\n"
 		"shrl $0x10, %%eax\n"
 		"xor %%ax, %%cx\n"
diff --git a/tools/nonce2key/crypto1.c b/tools/nonce2key/crypto1.c
index f4554605..d15a40e3 100644
--- a/tools/nonce2key/crypto1.c
+++ b/tools/nonce2key/crypto1.c
@@ -69,7 +69,7 @@ uint8_t crypto1_byte(struct Crypto1State *s, uint8_t in, int is_encrypted)
 	for (i = 0; i < 8; ++i)
 		ret |= crypto1_bit(s, BIT(in, i), is_encrypted) << i;
 	*/
-	// unfold loop
+// unfold loop 20161012
 	uint8_t ret = 0;
 	ret |= crypto1_bit(s, BIT(in, 0), is_encrypted) << 0;
 	ret |= crypto1_bit(s, BIT(in, 1), is_encrypted) << 1;
@@ -89,6 +89,7 @@ uint32_t crypto1_word(struct Crypto1State *s, uint32_t in, int is_encrypted)
 	for (i = 0; i < 32; ++i)
 		ret |= crypto1_bit(s, BEBIT(in, i), is_encrypted) << (i ^ 24);
 */
+//unfold loop 2016012
 	uint32_t ret = 0;
 	ret |= crypto1_bit(s, BEBIT(in, 0), is_encrypted) << (0 ^ 24);
 	ret |= crypto1_bit(s, BEBIT(in, 1), is_encrypted) << (1 ^ 24);
-- 
2.39.5