782 mp_err mp_sub(const mp_int *a, const mp_int *b, mp_int *c)  in mp_sub()  function
1358        (res = mp_sub(&t, a, &t)) != MP_OKAY)  in mp_sqrt()
1372     if((res = mp_sub(&x, &t, &x)) != MP_OKAY)  in mp_sqrt()
1437   if((res = mp_sub(a, b, c)) != MP_OKAY)  in mp_submod()
1861     if((res = mp_sub(&u, &v, &t)) != MP_OKAY)  in mp_gcd()
1993 	MP_CHECKOK( mp_sub(&B, &xc, &B) );  in mp_xgcd()
2006 	MP_CHECKOK( mp_sub(&D, &xc, &D) );  in mp_xgcd()
2012       MP_CHECKOK( mp_sub(&u, &v, &u) );  in mp_xgcd()
2013       MP_CHECKOK( mp_sub(&A, &C, &A) );  in mp_xgcd()
2014       MP_CHECKOK( mp_sub(&B, &D, &B) );  in mp_xgcd()
2016       MP_CHECKOK( mp_sub(&v, &u, &v) );  in mp_xgcd()
2017       MP_CHECKOK( mp_sub(&C, &A, &C) );  in mp_xgcd()
2018       MP_CHECKOK( mp_sub(&D, &B, &D) );  in mp_xgcd()
2138       MP_CHECKOK( mp_sub(&f, &g, &f) );	/* f = f - g */  in s_mp_almost_inverse()
2139       MP_CHECKOK( mp_sub(c,  &d,  c) );	/* c = c - d */  in s_mp_almost_inverse()
2324     MP_CHECKOK( mp_sub(&two, &tmp, &tmp) );  in s_mp_invmod_2d()
2398   MP_CHECKOK( mp_sub(&evenPart, &oddPart,   &tmp1) );  in s_mp_invmod_even_m()
4406   if((res = mp_sub(x, &q, x)) != MP_OKAY)  in s_mp_reduce()