  a = SHA_ROTL(b,5)+SHA_F3(c,d,e)+a+XW(n)+K2; c=SHA_ROTL(c,30) 
#define SHA_RND4(a,b,c,d,e,n) \
  a = SHA_ROTL(b,5)+SHA_F4(c,d,e)+a+XW(n)+K3; c=SHA_ROTL(c,30) 

#define LOAD(n) XW(n) = SHA_HTONL(inbuf[n])

  A = XH(0);
  B = XH(1);
  C = XH(2);
  D = XH(3);