ABytes := A.Bytes(M) mBig := new(big.Int).SetBytes(m) aBig := new(big.Int).SetBytes(a) bBig := new(big.Int).SetBytes(b) nBig := new(big.Int).Mul(aBig, bBig) nBig.Mod(nBig, mBig) nBigBytes := make([]byte, len(ABytes)) nBig.FillBytes(nBigBytes) if !bytes.Equal(ABytes, nBigBytes) { t.Errorf("got %x, want %x", ABytes, nBigBytes) } } func TestIs(t *testing.T) { checkYes := func(c choice, err string) { t.Helper() if c != yes { t.Error(err) } } checkNot := func(c choice, err string) { t.Helper() if c != no...