crypt_test.go

package cryptanalysis

import (
	"bytes"
	"testing"
)

func TestEncryptXor(t *testing.T) {
	key := []byte("ABC")
	data := []byte("TESTDATA")
	cipher := EncryptXor(data, key)
	res := []byte{21, 7, 16, 21, 6, 2, 21, 3}

	if bytes.Compare(cipher, res) != 0 {
		t.Error("Expected", res, "got", cipher)
	}
}

func TestEncryptEcb(t *testing.T) {
	key := []byte("YELLOW SUBMARINE")
	plain := []byte("This is a test of ECB.")
	expected := []byte{0xf6, 0xd6, 0xbb, 0xa9, 0xf4, 0x88, 0xc9, 0xe2, 0xbd,
		0xa5, 0x04, 0x27, 0x38, 0x28, 0x11, 0x2f, 0x8e, 0x81, 0x4d, 0xd8, 0xee,
		0xe7, 0xf3, 0x2c, 0x74, 0x9c, 0x7b, 0x62, 0xad, 0xfb, 0x19, 0xe4}

	cipher, err := EncryptEcb(plain, key)

	if err != nil {
		t.Error(err)
	}

	if bytes.Compare(cipher, expected) != 0 {
		t.Error("Expected", expected, "got", cipher)
	}
}

func TestDecryptEcb(t *testing.T) {
	key := []byte("YELLOW SUBMARINE")
	cipher := []byte{0xf6, 0xd6, 0xbb, 0xa9, 0xf4, 0x88, 0xc9, 0xe2, 0xbd,
		0xa5, 0x04, 0x27, 0x38, 0x28, 0x11, 0x2f, 0x8e, 0x81, 0x4d, 0xd8, 0xee,
		0xe7, 0xf3, 0x2c, 0x74, 0x9c, 0x7b, 0x62, 0xad, 0xfb, 0x19, 0xe4}
	expected := []byte("This is a test of ECB.\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a")

	plain, err := DecryptEcb(cipher, key)

	if err != nil {
		t.Error(err)
	}

	if bytes.Compare(plain, expected) != 0 {
		t.Error("Expected", expected, "got", plain)
	}
}

func TestEncryptCbc(t *testing.T) {
	key := []byte("YELLOW SUBMARINE")
	iv := make([]byte, 16)
	plain := []byte("This is a test of CBC.")
	expected := []byte{0xf6, 0xd6, 0xbb, 0xa9, 0xf4, 0x88, 0xc9, 0xe2, 0xbd,
		0xa5, 0x04, 0x27, 0x38, 0x28, 0x11, 0x2f, 0xe8, 0xf6, 0x27, 0xc3, 0xf4,
		0x7f, 0x38, 0xad, 0xbf, 0xa0, 0xd8, 0xbe, 0x5a, 0x02, 0x54, 0xde}

	cipher, err := EncryptCbc(plain, key, iv)

	if err != nil {
		t.Error(err)
	}

	if bytes.Compare(cipher, expected) != 0 {
		t.Error("Expected", expected, "got", cipher)
	}
}

func TestDecryptCbc(t *testing.T) {
	key := []byte("YELLOW SUBMARINE")
	iv := make([]byte, 16)
	cipher := []byte{0xf6, 0xd6, 0xbb, 0xa9, 0xf4, 0x88, 0xc9, 0xe2, 0xbd,
		0xa5, 0x04, 0x27, 0x38, 0x28, 0x11, 0x2f, 0xe8, 0xf6, 0x27, 0xc3, 0xf4,
		0x7f, 0x38, 0xad, 0xbf, 0xa0, 0xd8, 0xbe, 0x5a, 0x02, 0x54, 0xde}
	expected := []byte("This is a test of CBC.\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a")

	plain, err := DecryptCbc(cipher, key, iv)

	if err != nil {
		t.Error(err)
	}

	if bytes.Compare(plain, expected) != 0 {
		t.Error("Expected", expected, "got", plain)
	}
}