GG
GG(a, b, c, d, x[ 0], S21); /* 17 */
GG(d, a, b, c, x[ 4], S22); /* 18 */
GG(c, d, a, b, x[ 8], S23); /* 19 */
GG(b, c, d, a, x[12], S24); /* 20 */
GG(a, b, c, d, x[ 1], S21); /* 21 */
GG(d, a, b, c, x[ 5], S22); /* 22 */
GG(c, d, a, b, x[ 9], S23); /* 23 */
GG(b, c, d, a, x[13], S24); /* 24 */
GG(a, b, c, d, x[ 2], S21); /* 25 */
GG(d, a, b, c, x[ 6], S22); /* 26 */
GG(c, d, a, b, x[10], S23); /* 27 */
GG(b, c, d, a, x[14], S24); /* 28 */
GG(a, b, c, d, x[ 3], S21); /* 29 */
GG(d, a, b, c, x[ 7], S22); /* 30 */
GG(c, d, a, b, x[11], S23); /* 31 */
GG(b, c, d, a, x[15], S24); /* 32 */
GG(a, b, c, d, x_1, MD5_SHIFT_21, MD5_CONST_e(16)); /* 17 */
GG(d, a, b, c, x_6, MD5_SHIFT_22, MD5_CONST_o(17)); /* 18 */
GG(c, d, a, b, x_11, MD5_SHIFT_23, MD5_CONST_e(18)); /* 19 */
GG(b, c, d, a, x_0, MD5_SHIFT_24, MD5_CONST_o(19)); /* 20 */
GG(a, b, c, d, x_5, MD5_SHIFT_21, MD5_CONST_e(20)); /* 21 */
GG(d, a, b, c, x_10, MD5_SHIFT_22, MD5_CONST_o(21)); /* 22 */
GG(c, d, a, b, x_15, MD5_SHIFT_23, MD5_CONST_e(22)); /* 23 */
GG(b, c, d, a, x_4, MD5_SHIFT_24, MD5_CONST_o(23)); /* 24 */
GG(a, b, c, d, x_9, MD5_SHIFT_21, MD5_CONST_e(24)); /* 25 */
GG(d, a, b, c, x_14, MD5_SHIFT_22, MD5_CONST_o(25)); /* 26 */
GG(c, d, a, b, x_3, MD5_SHIFT_23, MD5_CONST_e(26)); /* 27 */
GG(b, c, d, a, x_8, MD5_SHIFT_24, MD5_CONST_o(27)); /* 28 */
GG(a, b, c, d, x_13, MD5_SHIFT_21, MD5_CONST_e(28)); /* 29 */
GG(d, a, b, c, x_2, MD5_SHIFT_22, MD5_CONST_o(29)); /* 30 */
GG(c, d, a, b, x_7, MD5_SHIFT_23, MD5_CONST_e(30)); /* 31 */
GG(b, c, d, a, x_12, MD5_SHIFT_24, MD5_CONST_o(31)); /* 32 */
GG (a, b, c, d, in[ 1], S21, 4129170786U); /* 17 */
GG (d, a, b, c, in[ 6], S22, 3225465664U); /* 18 */
GG (c, d, a, b, in[11], S23, 643717713U); /* 19 */
GG (b, c, d, a, in[ 0], S24, 3921069994U); /* 20 */
GG (a, b, c, d, in[ 5], S21, 3593408605U); /* 21 */
GG (d, a, b, c, in[10], S22, 38016083U); /* 22 */
GG (c, d, a, b, in[15], S23, 3634488961U); /* 23 */
GG (b, c, d, a, in[ 4], S24, 3889429448U); /* 24 */
GG (a, b, c, d, in[ 9], S21, 568446438U); /* 25 */
GG (d, a, b, c, in[14], S22, 3275163606U); /* 26 */
GG (c, d, a, b, in[ 3], S23, 4107603335U); /* 27 */
GG (b, c, d, a, in[ 8], S24, 1163531501U); /* 28 */
GG (a, b, c, d, in[13], S21, 2850285829U); /* 29 */
GG (d, a, b, c, in[ 2], S22, 4243563512U); /* 30 */
GG (c, d, a, b, in[ 7], S23, 1735328473U); /* 31 */
GG (b, c, d, a, in[12], S24, 2368359562U); /* 32 */
GG (a, b, c, d, in[round2indices[i]], round2consts[i%4]); ROTATE;
GG (a, b, c, d, in[ 0], 3);
GG (d, a, b, c, in[ 4], 5);
GG (c, d, a, b, in[ 8], 9);
GG (b, c, d, a, in[12], 13);
GG (a, b, c, d, in[ 1], 3);
GG (d, a, b, c, in[ 5], 5);
GG (c, d, a, b, in[ 9], 9);
GG (b, c, d, a, in[13], 13);
GG (a, b, c, d, in[ 2], 3);
GG (d, a, b, c, in[ 6], 5);
GG (c, d, a, b, in[10], 9);
GG (b, c, d, a, in[14], 13);
GG (a, b, c, d, in[ 3], 3);
GG (d, a, b, c, in[ 7], 5);
GG (c, d, a, b, in[11], 9);
GG (b, c, d, a, in[15], 13);
GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */