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      1 
      2 #include <stdint.h>
      3 #include <string.h>
      4 
      5 #include "blake2.h"
      6 #include "private/common.h"
      7 
      8 CRYPTO_ALIGN(64)
      9 static const uint64_t blake2b_IV[8] = {
     10     0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL, 0x3c6ef372fe94f82bULL,
     11     0xa54ff53a5f1d36f1ULL, 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
     12     0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
     13 };
     14 
     15 static const uint8_t blake2b_sigma[12][16] = {
     16     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
     17     { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
     18     { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
     19     { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
     20     { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
     21     { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
     22     { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
     23     { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
     24     { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
     25     { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
     26     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
     27     { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
     28 };
     29 
     30 int
     31 blake2b_compress_ref(blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES])
     32 {
     33     uint64_t m[16];
     34     uint64_t v[16];
     35     int      i;
     36 
     37     for (i   = 0; i < 16; ++i)
     38         m[i] = LOAD64_LE(block + i * sizeof(m[i]));
     39 
     40     for (i   = 0; i < 8; ++i)
     41         v[i] = S->h[i];
     42 
     43     v[8]  = blake2b_IV[0];
     44     v[9]  = blake2b_IV[1];
     45     v[10] = blake2b_IV[2];
     46     v[11] = blake2b_IV[3];
     47     v[12] = S->t[0] ^ blake2b_IV[4];
     48     v[13] = S->t[1] ^ blake2b_IV[5];
     49     v[14] = S->f[0] ^ blake2b_IV[6];
     50     v[15] = S->f[1] ^ blake2b_IV[7];
     51 #define G(r, i, a, b, c, d)                         \
     52     do {                                            \
     53         a = a + b + m[blake2b_sigma[r][2 * i + 0]]; \
     54         d = ROTR64(d ^ a, 32);                      \
     55         c = c + d;                                  \
     56         b = ROTR64(b ^ c, 24);                      \
     57         a = a + b + m[blake2b_sigma[r][2 * i + 1]]; \
     58         d = ROTR64(d ^ a, 16);                      \
     59         c = c + d;                                  \
     60         b = ROTR64(b ^ c, 63);                      \
     61     } while (0)
     62 #define ROUND(r)                           \
     63     do {                                   \
     64         G(r, 0, v[0], v[4], v[8], v[12]);  \
     65         G(r, 1, v[1], v[5], v[9], v[13]);  \
     66         G(r, 2, v[2], v[6], v[10], v[14]); \
     67         G(r, 3, v[3], v[7], v[11], v[15]); \
     68         G(r, 4, v[0], v[5], v[10], v[15]); \
     69         G(r, 5, v[1], v[6], v[11], v[12]); \
     70         G(r, 6, v[2], v[7], v[8], v[13]);  \
     71         G(r, 7, v[3], v[4], v[9], v[14]);  \
     72     } while (0)
     73     ROUND(0);
     74     ROUND(1);
     75     ROUND(2);
     76     ROUND(3);
     77     ROUND(4);
     78     ROUND(5);
     79     ROUND(6);
     80     ROUND(7);
     81     ROUND(8);
     82     ROUND(9);
     83     ROUND(10);
     84     ROUND(11);
     85 
     86     for (i = 0; i < 8; ++i) {
     87         S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
     88     }
     89 
     90 #undef G
     91 #undef ROUND
     92     return 0;
     93 }
     94