1036845195", 10) n := new(big.Int).Mul(a, b) N, _ := NewModulus(n.Bytes()) A := NewNat().setBig(a).ExpandFor(N) B := NewNat().setBig(b).ExpandFor(N) if A.Mul(B, N).IsZero() != 1 { t.Error("a * b mod (a * b) != 0") } i := new(big.Int).ModInverse(a, b) N, _ = NewModulus(b.Bytes()) A = NewNat().setBig(a).ExpandFor(N) I := NewNat().setBig(i).ExpandFor(N) one := NewNat().setBig(big.NewInt(1)).ExpandFor(N) if A.Mul(I, N).Equal(one) != 1 { t.Error("a * inv(a) mod b != 1") } } func TestMul(t *testing.T)...