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  1. uint32_t myrand(void)
  2. {
  3.     static uint32_t vec[] = {1, 1812433254, 3713160357, 3109174145};
  4.     static int i = 4;
  5.     __m128i x, y, z;
  6.     if (i == 4) {
  7.         x = _mm_load_si128((__m128i *)vec);
  8.         y = _mm_xor_si128(x, _mm_slli_si128(x, 1));
  9.         z = _mm_xor_si128(y, _mm_srli_si128(_mm_srli_epi64(y, 5), 8));
  10.         _mm_store_si128((__m128i *)vec, _mm_xor_si128(z, _mm_slli_si128(_mm_slli_epi64(z, 11), 8)));
  11.         i = 0;
  12.     }
  13.     return vec[i++];
  14. }
  15.  
  16. void set_random_key(MULTI2 *m2)
  17. {
  18.     uint8_t key[8];
  19.     uint32_t n;
  20.     n = myrand();
  21.     key[0]  = (n >> 24) & 0xFF;
  22.     key[1]  = (n >> 16) & 0xFF;
  23.     key[2]  = (n >>  8) & 0xFF;
  24.     key[3]  = (n >>  0) & 0xFF;
  25.     n = myrand();
  26.     key[4]  = (n >> 24) & 0xFF;
  27.     key[5]  = (n >> 16) & 0xFF;
  28.     key[6]  = (n >>  8) & 0xFF;
  29.     key[7]  = (n >>  0) & 0xFF;
  30.     m2->set_scramble_key(m2, key);
  31. }
Not running #stdin #stdout 0s 0KB
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https://ideone.com/qozIg
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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