MD5_SHIFT_31
HH(a, b, c, d, x_5, MD5_SHIFT_31, MD5_CONST_e(32)); /* 33 */
HH(a, b, c, d, x_1, MD5_SHIFT_31, MD5_CONST_e(36)); /* 37 */
HH(a, b, c, d, x_13, MD5_SHIFT_31, MD5_CONST_e(40)); /* 41 */
HH(a, b, c, d, x_9, MD5_SHIFT_31, MD5_CONST_e(44)); /* 45 */