MD5_SHIFT_32
HH(d, a, b, c, x_8, MD5_SHIFT_32, MD5_CONST_o(33)); /* 34 */
HH(d, a, b, c, x_4, MD5_SHIFT_32, MD5_CONST_o(37)); /* 38 */
HH(d, a, b, c, x_0, MD5_SHIFT_32, MD5_CONST_o(41)); /* 42 */
HH(d, a, b, c, x_12, MD5_SHIFT_32, MD5_CONST_o(45)); /* 46 */