processBlock method

@override void processBlock()

Process a whole block of data in extender digest.

Implementation

@override
void processBlock() {
  int i;
  // [REF1] 5.3.2 消息扩展
  // [REF2] 3.3.2 Message Extension
  _W.setAll(0, buffer);
  for (i = 16; i < 68; ++i) {
    _W[i] = _P1(_W[i - 16] ^ _W[i - 9] ^ rotl32(_W[i - 3], 15)) ^
        rotl32(_W[i - 13], 7) ^
        _W[i - 6];
  }
  // [REF1] 5.3.3 压缩函数
  // [REF2] 3.3.3 Compression Function
  var A = state[0];
  var B = state[1];
  var C = state[2];
  var D = state[3];
  var E = state[4];
  var F = state[5];
  var G = state[6];
  var H = state[7];
  int SS1, SS2, TT1, TT2, Tj;
  for (i = 0; i < 16; ++i) {
    Tj = 0x79cc4519;
    SS1 = rotl32(clip32(rotl32(A, 12) + E + rotl32(Tj, i)), 7);
    SS2 = SS1 ^ rotl32(A, 12);
    TT1 = clip32(_FF1(A, B, C) + D + SS2 + (_W[i] ^ _W[i + 4]));
    TT2 = clip32(_GG1(E, F, G) + H + SS1 + _W[i]);
    D = C;
    C = rotl32(B, 9);
    B = A;
    A = TT1;
    H = G;
    G = rotl32(F, 19);
    F = E;
    E = _P0(TT2);
  }
  for (i = 16; i < 64; ++i) {
    Tj = 0x7a879d8a;
    SS1 = rotl32(clip32(rotl32(A, 12) + E + rotl32(Tj, i)), 7);
    SS2 = SS1 ^ rotl32(A, 12);
    TT1 = clip32(_FF2(A, B, C) + D + SS2 + (_W[i] ^ _W[i + 4]));
    TT2 = clip32(_GG2(E, F, G) + H + SS1 + _W[i]);
    D = C;
    C = rotl32(B, 9);
    B = A;
    A = TT1;
    H = G;
    G = rotl32(F, 19);
    F = E;
    E = _P0(TT2);
  }
  state[0] ^= A;
  state[1] ^= B;
  state[2] ^= C;
  state[3] ^= D;
  state[4] ^= E;
  state[5] ^= F;
  state[6] ^= G;
  state[7] ^= H;
}