s_mp_add_d
MP_CHECKOK(s_mp_add_d(r,1));
mp_err s_mp_add_d(mp_int *mp, mp_digit d); /* unsigned digit addition */
s_mp_add_d(&mu, 1);
if((res = s_mp_add_d(mp, val)) != MP_OKAY)
res = s_mp_add_d(mp, (mp_digit)((v >> (ix * CHAR_BIT)) & UCHAR_MAX));
res = s_mp_add_d(mp, (mp_digit)((z >> (ix * CHAR_BIT)) & UCHAR_MAX));
if((res = s_mp_add_d(&tmp, d)) != MP_OKAY)
if((res = s_mp_add_d(&tmp, d)) != MP_OKAY)