Ejemplo n.º 1
0
func TestPKCS7UnPadding(t *testing.T) {
	// Verify the PKCS7 unpadding, using a human readable plaintext.

	// 0 byte/length message
	expected := []byte("")
	msg := []byte{16, 16, 16, 16,
		16, 16, 16, 16,
		16, 16, 16, 16,
		16, 16, 16, 16}

	result, _ := primitives.PKCS7UnPadding(msg)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}

	// 1 byte/length message
	expected = []byte("0")
	msg = []byte{'0', 15, 15, 15,
		15, 15, 15, 15,
		15, 15, 15, 15,
		15, 15, 15, 15}

	result, _ = primitives.PKCS7UnPadding(msg)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}

	// 2 byte/length message
	expected = []byte("01")
	msg = []byte{'0', '1', 14, 14,
		14, 14, 14, 14,
		14, 14, 14, 14,
		14, 14, 14, 14}

	result, _ = primitives.PKCS7UnPadding(msg)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}

	// 3 to aes.BlockSize-1 byte messages
	for i := 3; i < aes.BlockSize; i++ {
		base := []byte("0123456789ABCDEF")

		iPad := aes.BlockSize - i
		padding := bytes.Repeat([]byte{byte(iPad)}, iPad)
		msg = append(base[:i], padding...)

		expected := base[:i]
		result, _ := primitives.PKCS7UnPadding(msg)

		if !bytes.Equal(result, expected) {
			t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
		}

	}

	// aes.BlockSize length message
	expected = bytes.Repeat([]byte{byte('x')}, aes.BlockSize)

	padding := bytes.Repeat([]byte{byte(aes.BlockSize)},
		aes.BlockSize)
	msg = append(expected, padding...)

	result, _ = primitives.PKCS7UnPadding(msg)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}
}
Ejemplo n.º 2
0
// TestPKCS7UnPadding verifies the PKCS#7 unpadding, using a human readable plaintext.
func TestPKCS7UnPadding(t *testing.T) {

	// 0 byte/length ptext
	expected := []byte("")
	ptext := []byte{16, 16, 16, 16,
		16, 16, 16, 16,
		16, 16, 16, 16,
		16, 16, 16, 16}

	result, _ := primitives.PKCS7UnPadding(ptext)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}

	// 1 byte/length ptext
	expected = []byte("1")
	ptext = []byte{'1', 15, 15, 15,
		15, 15, 15, 15,
		15, 15, 15, 15,
		15, 15, 15, 15}

	result, _ = primitives.PKCS7UnPadding(ptext)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}

	// 2 byte/length ptext
	expected = []byte("12")
	ptext = []byte{'1', '2', 14, 14,
		14, 14, 14, 14,
		14, 14, 14, 14,
		14, 14, 14, 14}

	result, _ = primitives.PKCS7UnPadding(ptext)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}

	// 3 to aes.BlockSize-1 byte plaintext
	base := []byte("1234567890ABCDEF")
	for i := 3; i < aes.BlockSize; i++ {
		iPad := aes.BlockSize - i
		padding := bytes.Repeat([]byte{byte(iPad)}, iPad)
		ptext = append(base[:i], padding...)

		expected := base[:i]
		result, _ := primitives.PKCS7UnPadding(ptext)

		if !bytes.Equal(result, expected) {
			t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
		}

	}

	// aes.BlockSize length ptext
	expected = bytes.Repeat([]byte{byte('x')}, aes.BlockSize)
	padding := bytes.Repeat([]byte{byte(aes.BlockSize)}, aes.BlockSize)
	ptext = append(expected, padding...)

	result, _ = primitives.PKCS7UnPadding(ptext)

	if !bytes.Equal(expected, result) {
		t.Fatal("UnPadding error! Expected: '", expected, "', received: '", result, "'")
	}
}