S41
II (a, b, c, d, in[ 0], S41, 4096336452U); /* 49 */
II (a, b, c, d, in[12], S41, 1700485571U); /* 53 */
II (a, b, c, d, in[ 8], S41, 1873313359U); /* 57 */
II (a, b, c, d, in[ 4], S41, 4149444226U); /* 61 */
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */