t.Fatalf("mul(%#x, %#x) = %#x, want %#x", i, j, x, s) } } } } // Check that S-boxes are inverses of each other. // They have more structure that we could test, // but if this sanity check passes, we'll assume // the cut and paste from the FIPS PDF worked. func TestSboxes(t *testing.T) { for i := 0; i < 256; i++ { if j := sbox0[sbox1[i]]; j != byte(i) { t.Errorf("sbox0[sbox1[%#x]] = %#x", i, j) } if j := sbox1[sbox0[i]]; j != byte(i) { t.Errorf("sbox1[sbox0[%#x]] = %#x", i, j) } } } // Test that encryption...