Home | History | Annotate | Line # | Download | only in ref 
      1 #include "crypto_shorthash_siphash24.h"
      2 #include "private/common.h"
      3 #include "shorthash_siphash_ref.h"
      4 
      5 int
      6 crypto_shorthash_siphashx24(unsigned char *out, const unsigned char *in,
      7                             unsigned long long inlen, const unsigned char *k)
      8 {
      9     uint64_t       v0 = 0x736f6d6570736575ULL;
     10     uint64_t       v1 = 0x646f72616e646f83ULL;
     11     uint64_t       v2 = 0x6c7967656e657261ULL;
     12     uint64_t       v3 = 0x7465646279746573ULL;
     13     uint64_t       b;
     14     uint64_t       k0 = LOAD64_LE(k);
     15     uint64_t       k1 = LOAD64_LE(k + 8);
     16     uint64_t       m;
     17     const uint8_t *end  = in + inlen - (inlen % sizeof(uint64_t));
     18     const int      left = inlen & 7;
     19 
     20     b = ((uint64_t) inlen) << 56;
     21     v3 ^= k1;
     22     v2 ^= k0;
     23     v1 ^= k1;
     24     v0 ^= k0;
     25     for (; in != end; in += 8) {
     26         m = LOAD64_LE(in);
     27         v3 ^= m;
     28         SIPROUND;
     29         SIPROUND;
     30         v0 ^= m;
     31     }
     32     switch (left) {
     33     case 7:
     34         b |= ((uint64_t) in[6]) << 48;
     35     case 6:
     36         b |= ((uint64_t) in[5]) << 40;
     37     case 5:
     38         b |= ((uint64_t) in[4]) << 32;
     39     case 4:
     40         b |= ((uint64_t) in[3]) << 24;
     41     case 3:
     42         b |= ((uint64_t) in[2]) << 16;
     43     case 2:
     44         b |= ((uint64_t) in[1]) << 8;
     45     case 1:
     46         b |= ((uint64_t) in[0]);
     47         break;
     48     case 0:
     49         break;
     50     }
     51     v3 ^= b;
     52     SIPROUND;
     53     SIPROUND;
     54     v0 ^= b;
     55     v2 ^= 0xee;
     56     SIPROUND;
     57     SIPROUND;
     58     SIPROUND;
     59     SIPROUND;
     60     b = v0 ^ v1 ^ v2 ^ v3;
     61     STORE64_LE(out, b);
     62     v1 ^= 0xdd;
     63     SIPROUND;
     64     SIPROUND;
     65     SIPROUND;
     66     SIPROUND;
     67     b = v0 ^ v1 ^ v2 ^ v3;
     68     STORE64_LE(out + 8, b);
     69 
     70     return 0;
     71 }
     72