md4_round1
md4_round1(&A, B, C, D, X0, 3);
md4_round1(&D, A, B, C, X1, 7);
md4_round1(&C, D, A, B, X2, 11);
md4_round1(&B, C, D, A, X3, 19);
md4_round1(&A, B, C, D, X4, 3);
md4_round1(&D, A, B, C, X5, 7);
md4_round1(&C, D, A, B, X6, 11);
md4_round1(&B, C, D, A, X7, 19);
md4_round1(&A, B, C, D, X8, 3);
md4_round1(&D, A, B, C, X9, 7);
md4_round1(&C, D, A, B, X10, 11);
md4_round1(&B, C, D, A, X11, 19);
md4_round1(&A, B, C, D, X12, 3);
md4_round1(&D, A, B, C, X13, 7);
md4_round1(&C, D, A, B, X14, 11);
md4_round1(&B, C, D, A, X15, 19);