CHG: Changed the number of times the call to prng_successor is called.

diff --git a/client/nonce2key/nonce2key.c b/client/nonce2key/nonce2key.c
index ab97f5979dcb32d70855669b3d65adee638545f1..bc8958265a83db79331717ceb14c7cad3b7b79ac 100644 (file)
--- a/client/nonce2key/nonce2key.c
+++ b/client/nonce2key/nonce2key.c
@@ -170,8 +170,9 @@ bool tryMfk32(nonces_t data, uint64_t *outputkey) {
        bool isSuccess = FALSE;
        uint8_t counter = 0;
 
-
-       s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
+       uint32_t p64 = prng_successor(nt, 64);
+       
+       s = lfsr_recovery32(ar0_enc ^ p64, 0);
   
        for(t = s; t->odd | t->even; ++t) {
                lfsr_rollback_word(t, 0, 0);
@@ -180,7 +181,7 @@ bool tryMfk32(nonces_t data, uint64_t *outputkey) {
                crypto1_get_lfsr(t, &key);
                crypto1_word(t, uid ^ nt, 0);
                crypto1_word(t, nr1_enc, 1);
-               if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
+               if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64)) {
                        //PrintAndLog("Found Key: [%012"llx"]", key);
                        outkey = key;
                        ++counter;
@@ -190,7 +191,8 @@ bool tryMfk32(nonces_t data, uint64_t *outputkey) {
        isSuccess = (counter > 0);
        t1 = clock() - t1;
        if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.0f ticks  - possible keys %d\n", (float)t1, counter);
-       *outputkey = ( isSuccess ) ? outkey : 0;
+
+       *outputkey = ( isSuccess ) ? outkey : 0;        
        crypto1_destroy(s);
        return isSuccess;
 }
@@ -213,7 +215,10 @@ bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
        //PrintAndLog("Enter mfkey32_moebius");
        clock_t t1 = clock();
 
-       s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
+       uint32_t p640 = prng_successor(nt0, 64);
+       uint32_t p641 = prng_successor(nt1, 64);
+       
+       s = lfsr_recovery32(ar0_enc ^ p640, 0);
   
        for(t = s; t->odd | t->even; ++t) {
                lfsr_rollback_word(t, 0, 0);
@@ -223,7 +228,7 @@ bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
                
                crypto1_word(t, uid ^ nt1, 0);
                crypto1_word(t, nr1_enc, 1);
-               if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
+               if (ar1_enc == (crypto1_word(t, 0, 0) ^ p641)) {
                        //PrintAndLog("Found Key: [%012"llx"]",key);
                        outkey=key;
                        ++counter;
@@ -233,6 +238,7 @@ bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
     isSuccess  = (counter > 0);
        t1 = clock() - t1;
        if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.0f ticks  - possible keys %d\n", (float)t1, counter);
+
        *outputkey = ( isSuccess ) ? outkey : 0;
        crypto1_destroy(s);
        return isSuccess;
@@ -248,9 +254,9 @@ int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
 }
 
 int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
-       uint64_t key    = 0;                            // recovered key
-       uint32_t ks2;                                           // keystream used to encrypt reader response
-       uint32_t ks3;                                           // keystream used to encrypt tag response
+       uint64_t key = 0;               // recovered key
+       uint32_t ks2;                   // keystream used to encrypt reader response
+       uint32_t ks3;                   // keystream used to encrypt tag response
        struct Crypto1State *revstate;
        
        PrintAndLog("Enter mfkey64");
@@ -265,11 +271,12 @@ int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32
        lfsr_rollback_word(revstate, nr_enc, 1);
        lfsr_rollback_word(revstate, uid ^ nt, 0);
        crypto1_get_lfsr(revstate, &key);
+
        PrintAndLog("Found Key: [%012"llx"]", key);
-       crypto1_destroy(revstate);
-       *outputkey = key;
-       
        t1 = clock() - t1;
        if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.0f ticks \n", (float)t1);
+
+       *outputkey = key;
+       crypto1_destroy(revstate);
        return 0;
 }