X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a1afa550ea5b602b6d8bc69bdc6f018696b21ff0..b416b7d2870e24d23f72b863b8d4ff7b73557301:/tools/mfkey/crapto1.c diff --git a/tools/mfkey/crapto1.c b/tools/mfkey/crapto1.c index 995d0069..b6e0e87d 100755 --- a/tools/mfkey/crapto1.c +++ b/tools/mfkey/crapto1.c @@ -31,49 +31,75 @@ static void __attribute__((constructor)) fill_lut() #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) + + +typedef struct bucket { + uint32_t *head; + uint32_t *bp; +} bucket_t; + +typedef bucket_t bucket_array_t[2][0x100]; + +typedef struct bucket_info { + struct { + uint32_t *head, *tail; + } bucket_info[2][0x100]; + uint32_t numbuckets; + } bucket_info_t; + + +static void bucket_sort_intersect(uint32_t* const estart, uint32_t* const estop, + uint32_t* const ostart, uint32_t* const ostop, + bucket_info_t *bucket_info, bucket_array_t bucket) { - 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; + uint32_t *p1, *p2; + uint32_t *start[2]; + uint32_t *stop[2]; + + start[0] = estart; + stop[0] = estop; + start[1] = ostart; + stop[1] = ostop; + + // init buckets to be empty + for (uint32_t i = 0; i < 2; i++) { + for (uint32_t j = 0x00; j <= 0xff; j++) { + bucket[i][j].bp = bucket[i][j].head; + } + } + + // sort the lists into the buckets based on the MSB (contribution bits) + for (uint32_t i = 0; i < 2; i++) { + for (p1 = start[i]; p1 <= stop[i]; p1++) { + uint32_t bucket_index = (*p1 & 0xff000000) >> 24; + *(bucket[i][bucket_index].bp++) = *p1; + } + } + + + // write back intersecting buckets as sorted list. + // fill in bucket_info with head and tail of the bucket contents in the list and number of non-empty buckets. + uint32_t nonempty_bucket; + for (uint32_t i = 0; i < 2; i++) { + p1 = start[i]; + nonempty_bucket = 0; + for (uint32_t j = 0x00; j <= 0xff; j++) { + if (bucket[0][j].bp != bucket[0][j].head && bucket[1][j].bp != bucket[1][j].head) { // non-empty intersecting buckets only + bucket_info->bucket_info[i][nonempty_bucket].head = p1; + for (p2 = bucket[i][j].head; p2 < bucket[i][j].bp; *p1++ = *p2++); + bucket_info->bucket_info[i][nonempty_bucket].tail = p1 - 1; + nonempty_bucket++; + } + } + bucket_info->numbuckets = nonempty_bucket; + } } + /** 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 +111,7 @@ 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) @@ -109,14 +134,16 @@ 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) - if(filter(*tbl) ^ filter(*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) { + } else if(filter(*tbl) == bit) { // insert *++*end = *++tbl; *tbl = tbl[-1] | 1; - } else + } else { // drop *tbl-- = *(*end)--; + } + } } /** recover * recursively narrow down the search space, 4 bits of keystream at a time @@ -124,9 +151,10 @@ static inline void extend_table_simple(uint32_t *tbl, uint32_t **end, int bit) 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) { @@ -140,35 +168,26 @@ 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; } @@ -201,6 +220,18 @@ 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)) @@ -218,11 +249,13 @@ 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; @@ -349,7 +382,7 @@ 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 +405,7 @@ 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 +442,6 @@ 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 +482,11 @@ 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 +533,6 @@ 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 +542,7 @@ 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; @@ -523,9 +554,8 @@ 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) @@ -537,9 +567,8 @@ 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; }