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      1 #include "crypto_shorthash_siphash24.h"
      2 #include "private/common.h"
      3 #include "shorthash_siphash_ref.h"
      4 
      5 int
      6 crypto_shorthash_siphash24(unsigned char *out, const unsigned char *in,
      7                            unsigned long long inlen, const unsigned char *k)
      8 {
      9     /* "somepseudorandomlygeneratedbytes" */
     10     uint64_t       v0 = 0x736f6d6570736575ULL;
     11     uint64_t       v1 = 0x646f72616e646f6dULL;
     12     uint64_t       v2 = 0x6c7967656e657261ULL;
     13     uint64_t       v3 = 0x7465646279746573ULL;
     14     uint64_t       b;
     15     uint64_t       k0 = LOAD64_LE(k);
     16     uint64_t       k1 = LOAD64_LE(k + 8);
     17     uint64_t       m;
     18     const uint8_t *end  = in + inlen - (inlen % sizeof(uint64_t));
     19     const int      left = inlen & 7;
     20 
     21     b = ((uint64_t) inlen) << 56;
     22     v3 ^= k1;
     23     v2 ^= k0;
     24     v1 ^= k1;
     25     v0 ^= k0;
     26     for (; in != end; in += 8) {
     27         m = LOAD64_LE(in);
     28         v3 ^= m;
     29         SIPROUND;
     30         SIPROUND;
     31         v0 ^= m;
     32     }
     33     switch (left) {
     34     case 7:
     35         b |= ((uint64_t) in[6]) << 48;
     36     case 6:
     37         b |= ((uint64_t) in[5]) << 40;
     38     case 5:
     39         b |= ((uint64_t) in[4]) << 32;
     40     case 4:
     41         b |= ((uint64_t) in[3]) << 24;
     42     case 3:
     43         b |= ((uint64_t) in[2]) << 16;
     44     case 2:
     45         b |= ((uint64_t) in[1]) << 8;
     46     case 1:
     47         b |= ((uint64_t) in[0]);
     48         break;
     49     case 0:
     50         break;
     51     }
     52     v3 ^= b;
     53     SIPROUND;
     54     SIPROUND;
     55     v0 ^= b;
     56     v2 ^= 0xff;
     57     SIPROUND;
     58     SIPROUND;
     59     SIPROUND;
     60     SIPROUND;
     61     b = v0 ^ v1 ^ v2 ^ v3;
     62     STORE64_LE(out, b);
     63 
     64     return 0;
     65 }
     66