sha256_transform

DECLSPEC void sha256_transform (const u32 *w0, const u32 *w1, const u32 *w2, const u32 *w3, u32 *digest)
{
  u32 a = digest[];
  u32 b = digest[];
  u32 c = digest[];
  u32 d = digest[];
  u32 e = digest[];
  u32 f = digest[];
  u32 g = digest[];
  u32 h = digest[];

  u32 w0_t = w0[];
  u32 w1_t = w0[];
  u32 w2_t = w0[];
  u32 w3_t = w0[];
  u32 w4_t = w1[];
  u32 w5_t = w1[];
  u32 w6_t = w1[];
  u32 w7_t = w1[];
  u32 w8_t = w2[];
  u32 w9_t = w2[];
  u32 wa_t = w2[];
  u32 wb_t = w2[];
  u32 wc_t = w3[];
  u32 wd_t = w3[];
  u32 we_t = w3[];
  u32 wf_t = w3[];

  #define ROUND_EXPAND_S()                            \
  {                                                   \
    w0_t = SHA256_EXPAND_S (we_t, w9_t, w1_t, w0_t);  \
    w1_t = SHA256_EXPAND_S (wf_t, wa_t, w2_t, w1_t);  \
    w2_t = SHA256_EXPAND_S (w0_t, wb_t, w3_t, w2_t);  \
    w3_t = SHA256_EXPAND_S (w1_t, wc_t, w4_t, w3_t);  \
    w4_t = SHA256_EXPAND_S (w2_t, wd_t, w5_t, w4_t);  \
    w5_t = SHA256_EXPAND_S (w3_t, we_t, w6_t, w5_t);  \
    w6_t = SHA256_EXPAND_S (w4_t, wf_t, w7_t, w6_t);  \
    w7_t = SHA256_EXPAND_S (w5_t, w0_t, w8_t, w7_t);  \
    w8_t = SHA256_EXPAND_S (w6_t, w1_t, w9_t, w8_t);  \
    w9_t = SHA256_EXPAND_S (w7_t, w2_t, wa_t, w9_t);  \
    wa_t = SHA256_EXPAND_S (w8_t, w3_t, wb_t, wa_t);  \
    wb_t = SHA256_EXPAND_S (w9_t, w4_t, wc_t, wb_t);  \
    wc_t = SHA256_EXPAND_S (wa_t, w5_t, wd_t, wc_t);  \
    wd_t = SHA256_EXPAND_S (wb_t, w6_t, we_t, wd_t);  \
    we_t = SHA256_EXPAND_S (wc_t, w7_t, wf_t, we_t);  \
    wf_t = SHA256_EXPAND_S (wd_t, w8_t, w0_t, wf_t);  \
  }

  #define ROUND_STEP_S(i)                                                                   \
  {                                                                                         \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, a, b, c, d, e, f, g, h, w0_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, h, a, b, c, d, e, f, g, w1_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, g, h, a, b, c, d, e, f, w2_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, f, g, h, a, b, c, d, e, w3_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, e, f, g, h, a, b, c, d, w4_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, d, e, f, g, h, a, b, c, w5_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, c, d, e, f, g, h, a, b, w6_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, b, c, d, e, f, g, h, a, w7_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, a, b, c, d, e, f, g, h, w8_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, h, a, b, c, d, e, f, g, w9_t, k_sha256[i +  ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, g, h, a, b, c, d, e, f, wa_t, k_sha256[i + ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, f, g, h, a, b, c, d, e, wb_t, k_sha256[i + ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, e, f, g, h, a, b, c, d, wc_t, k_sha256[i + ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, d, e, f, g, h, a, b, c, wd_t, k_sha256[i + ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, c, d, e, f, g, h, a, b, we_t, k_sha256[i + ]); \
    SHA256_STEP_S (SHA256_F0o, SHA256_F1o, b, c, d, e, f, g, h, a, wf_t, k_sha256[i + ]); \
  }

  ROUND_STEP_S ();

  #ifdef _unroll
  #pragma unroll
  #endif
  for (int i = ; i < ; i += )
  {
    ROUND_EXPAND_S (); ROUND_STEP_S (i);
  }

  #undef ROUND_EXPAND_S
  #undef ROUND_STEP_S

  digest[] += a;
  digest[] += b;
  digest[] += c;
  digest[] += d;
  digest[] += e;
  digest[] += f;
  digest[] += g;
  digest[] += h;
}