text: 
  #include <stdint.h>
  #include <string.h>
  
  #include "blake2.h"
  #include <sodium/private/common.h>
  
  CRYPTO_ALIGN(64)
  static const uint64_t blake2b_IV[8] = {
      0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL, 0x3c6ef372fe94f82bULL,
      0xa54ff53a5f1d36f1ULL, 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
      0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL};
  
  static const uint8_t blake2b_sigma[12][16] = {
      {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
      {14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3},
      {11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4},
      {7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8},
      {9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13},
      {2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9},
      {12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11},
      {13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10},
      {6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5},
      {10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0},
      {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
      {14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3}};
  
  int
  blake2b_compress_ref(blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES])
  {
    uint64_t m[16];
    uint64_t v[16];
    int i;
  
    for(i = 0; i < 16; ++i)
    {
      m[i] = LOAD64_LE(block + i * sizeof(m[i]));
    }
    for(i = 0; i < 8; ++i)
    {
      v[i] = S->h[i];
    }
    v[8]  = blake2b_IV[0];
    v[9]  = blake2b_IV[1];
    v[10] = blake2b_IV[2];
    v[11] = blake2b_IV[3];
    v[12] = S->t[0] ^ blake2b_IV[4];
    v[13] = S->t[1] ^ blake2b_IV[5];
    v[14] = S->f[0] ^ blake2b_IV[6];
    v[15] = S->f[1] ^ blake2b_IV[7];
  #define G(r, i, a, b, c, d)                     \
    do                                            \
    {                                             \
      a = a + b + m[blake2b_sigma[r][2 * i + 0]]; \
      d = ROTR64(d ^ a, 32);                      \
      c = c + d;                                  \
      b = ROTR64(b ^ c, 24);                      \
      a = a + b + m[blake2b_sigma[r][2 * i + 1]]; \
      d = ROTR64(d ^ a, 16);                      \
      c = c + d;                                  \
      b = ROTR64(b ^ c, 63);                      \
    } while(0)
  #define ROUND(r)                       \
    do                                   \
    {                                    \
      G(r, 0, v[0], v[4], v[8], v[12]);  \
      G(r, 1, v[1], v[5], v[9], v[13]);  \
      G(r, 2, v[2], v[6], v[10], v[14]); \
      G(r, 3, v[3], v[7], v[11], v[15]); \
      G(r, 4, v[0], v[5], v[10], v[15]); \
      G(r, 5, v[1], v[6], v[11], v[12]); \
      G(r, 6, v[2], v[7], v[8], v[13]);  \
      G(r, 7, v[3], v[4], v[9], v[14]);  \
    } while(0)
    ROUND(0);
    ROUND(1);
    ROUND(2);
    ROUND(3);
    ROUND(4);
    ROUND(5);
    ROUND(6);
    ROUND(7);
    ROUND(8);
    ROUND(9);
    ROUND(10);
    ROUND(11);
  
    for(i = 0; i < 8; ++i)
    {
      S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
    }
  
  #undef G
  #undef ROUND
    return 0;
  }
  