MD5_SHIFT_23
GG(c, d, a, b, x_11, MD5_SHIFT_23, MD5_CONST_e(18)); /* 19 */
GG(c, d, a, b, x_15, MD5_SHIFT_23, MD5_CONST_e(22)); /* 23 */
GG(c, d, a, b, x_3, MD5_SHIFT_23, MD5_CONST_e(26)); /* 27 */
GG(c, d, a, b, x_7, MD5_SHIFT_23, MD5_CONST_e(30)); /* 31 */