X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/8130eba4d127d1093f55334998f25230f0731a92..ab74872d40cf1f6b91344909e307ae788a3f8497:/client/nonce2key/crapto1.c diff --git a/client/nonce2key/crapto1.c b/client/nonce2key/crapto1.c index 8754c3c9..9f6f7f6b 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, @@ -501,6 +467,21 @@ 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) { + + uint32_t c = 0; + + sl->odd = odd ^ fastfwd[1][c]; + sl->even = even ^ fastfwd[0][c]; + + lfsr_rollback_bit(sl, 0, 0); + lfsr_rollback_bit(sl, 0, 0); + lfsr_rollback_bit(sl, 0, 0); + lfsr_rollback_word(sl, 0, 0); + lfsr_rollback_word(sl, prefix | c << 5, 1); + + return ++sl; +} /** lfsr_common_prefix * Implentation of the common prefix attack. @@ -520,12 +501,11 @@ 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) << 21); + 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) @@ -537,7 +517,39 @@ 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); + } + + // in this version, -1 signifies end of states + s->odd = s->even = -1; + +out: free(odd); free(even); return statelist;