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get_key_operations_subaru.cpp
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#include "get_key_operations_subaru.h"
#include <ui_ecu_operations.h>
#include <QRandomGenerator>
GetKeyOperationsSubaru::GetKeyOperationsSubaru(QWidget *parent)
: QDialog(parent),
ui(new Ui::EcuOperationsWindow)
{
ui->setupUi(this);
this->setWindowTitle("Determine Encryption Keys from Unencrypted and Encrypted Files");
this->show();
int result = 0;
ui->progressbar->setValue(0);
result = load_and_apply_linear_approx();
if (result == STATUS_SUCCESS)
{
QMessageBox::information(this, tr("Get Key Operation"), "Get Key operation completed succesfully, press OK to exit");
this->accept();
//this->close();
}
else
{
QMessageBox::warning(this, tr("Get Key Operation"), "Get Key operation failed, press OK to exit and try again");
}
}
GetKeyOperationsSubaru::~GetKeyOperationsSubaru()
{
delete ui;
}
void GetKeyOperationsSubaru::closeEvent(QCloseEvent *bar)
{
//kill_process = true;
//ecuOperations->kill_process = true;
}
int GetKeyOperationsSubaru::load_and_apply_linear_approx()
{
//QFileDialog openDialog;
QString unencryptedFilename = QFileDialog::getOpenFileName(this, tr("Select unencrypted ROM"));
if (unencryptedFilename.isEmpty())
{
QMessageBox::information(this, tr("Unencrypted file"), "No file selected");
}
QString encryptedFilename = QFileDialog::getOpenFileName(this, tr("Select encrypted ROM"));
if (encryptedFilename.isEmpty())
{
QMessageBox::information(this, tr("Encrypted file"), "No file selected");
}
QFile unencryptedFile(unencryptedFilename);
if (!unencryptedFile.open(QIODevice::ReadOnly ))
{
QMessageBox::warning(this, tr("File"), "Unable to open file for reading");
return STATUS_ERROR;
}
QByteArray unencryptedFileData = unencryptedFile.readAll();
unencryptedFile.close();
QFile encryptedFile(encryptedFilename);
if (!encryptedFile.open(QIODevice::ReadOnly ))
{
QMessageBox::warning(this, tr("File"), "Unable to open file for reading");
return STATUS_ERROR;
}
QByteArray encryptedFileData = encryptedFile.readAll();
encryptedFile.close();
emit LOG_I("Files loaded successfully", true, true);
//uint16_t keys[]={
// 0x3b61, 0x8bef, 0x9e51, 0x1075
//};
int inBits[][2]={
{20, 21}, {24, 25}, {28, 29}, {32, 17}
};
int outBits[][2]={
{11, 8}, {15, 12}, {3, 16}, {7, 4}
};
uint32_t plainText, cipherText;
uint16_t x2Text, x3Text, k4, k1, k2, k3, x1, x4, fOutcome;
int counter[4][0x20], nybble, subkey, j, k, total;
bool alreadyExists[0x20000/4];
for (nybble = 0; nybble < 4; nybble++) for (subkey = 0; subkey < 0x20; subkey++) counter[nybble][subkey] = 0;
total = 0;
for(j = 0; j < 0x20000; j+=4)
{
alreadyExists[j/4] = false;
for (k = 0; k < j; k+=4)
{
alreadyExists[j/4] = (unencryptedFileData[j] == unencryptedFileData[k]) && (unencryptedFileData[j+1] == unencryptedFileData[k+1]) && (unencryptedFileData[j+2] == unencryptedFileData[k+2]) && (unencryptedFileData[j+3] == unencryptedFileData[k+3]);
if(alreadyExists[j/4]) k = j;
}
}
emit LOG_I("Start Time", true, true);
for (j = 0; j < 0x20000; j+=4) // 0x20000
{
//emit LOG_I("plaintext value = " + parse_message_to_hex(inDWord) + " ciphertext value = " + parse_message_to_hex(outDWord), true, true);
if (!alreadyExists[j/4])
{
total++;
plainText = ((unencryptedFileData[j] << 24) & 0xFF000000) + ((unencryptedFileData[j+1] << 16) & 0xFF0000) + ((unencryptedFileData[j+2] << 8) & 0xFF00) + (unencryptedFileData[j+3] & 0xFF);
cipherText = ((encryptedFileData[j] << 24) & 0xFF000000) + ((encryptedFileData[j+1] << 16) & 0xFF0000) + ((encryptedFileData[j+2] << 8) & 0xFF00) + (encryptedFileData[j+3] & 0xFF);
/*
plainText = QRandomGenerator::global()->generate();
//emit LOG_I("Plaintext: " + QString::number(plainText, 16) + " Ciphertext " + QString::number(cipherText, 16), true, true);
cipherText = manyRoundAndFlip(plainText, keys, 4);
cipherText = flipLeftRight(cipherText);
//emit LOG_I("Plaintext: " + QString::number(plainText, 16) + " Ciphertext " + QString::number(cipherText, 16), true, true);
*/
x4 = cipherText & 0xFFFF;
for(nybble = 0; nybble < 4; nybble++)
{
uint8_t p = get_bit(plainText, inBits[nybble][0]) ^ get_bit(plainText, inBits[nybble][1]) ^ get_bit(plainText, outBits[nybble][0]) ^ get_bit(plainText, outBits[nybble][1]);
uint8_t c = get_bit(cipherText, outBits[nybble][0]+16) ^ get_bit(cipherText, outBits[nybble][1]+16);
for(subkey = 0; subkey < 0x20; subkey++)
{
k4 = subkey << (12 - (nybble * 4));
if ((nybble == 0) && (subkey > 0xf)) k4 += 0x01;
fOutcome = fFunction(x4, k4);
x3Text = ((cipherText >> 16) & 0xffff) ^ fOutcome;
//emit LOG_I("plaintext = " + QString::number(plainText, 16) + " ciphertext = " + QString::number(cipherText, 16) + " x3text = " + QString::number(x3Text, 16), true, true);
uint8_t x3_bits = get_bit(x3Text, inBits[nybble][0]) ^ get_bit(x3Text, inBits[nybble][1]);
uint8_t z = p ^ c ^ x3_bits;
//emit LOG_I("p3:" + QString::number(p3, 16) + " p15:" + QString::number(p15, 16) + " p16:" + QString::number(p16, 16) + " p28:" + QString::number(p28, 16) + " p29:" + QString::number(p29, 16) + " c19:" + QString::number(c19, 16) + " c31:" + QString::number(c31, 16) + " c32:" + QString::number(c32, 16) + " x3_28:" + QString::number(x3_28, 16) + " x3_29:" + QString::number(x3_29, 16), true, true);
if (z == 0) counter[nybble][subkey]++;
}
}
}
//if ((j % 3000) == 0) emit LOG_I("Unique plaintext / ciphertext pair tested: " + QString::number(total), true, true);
}
int order[4][0x20];
for(nybble = 0; nybble < 4; nybble++)
{
for (subkey = 0; subkey < 0x20; subkey++)
{
counter[nybble][subkey] = abs(counter[nybble][subkey] - total/2);
order[nybble][subkey] = subkey;
}
}
k4 = 0;
for (nybble = 0; nybble < 4; nybble++)
{
//uint32_t correctKey = ((keys[3] + ((keys[3] & 0x01) << 16)) >> (12 - (nybble * 4))) & 0x1f;
//emit LOG_I("Nybble: " + QString::number(nybble) + " Correct key: 0x" + QString::number(correctKey, 16) + " Count: " + QString::number(counter[nybble][correctKey]), true, true);
int tempMax, tempOrder;
for (subkey = 1; subkey < 0x20; subkey++)
{
tempMax = counter[nybble][subkey];
tempOrder = order[nybble][subkey];
j = subkey - 1;
while (j >= 0 && counter[nybble][j] > tempMax)
{
counter[nybble][j+1] = counter[nybble][j];
order[nybble][j+1] = order[nybble][j];
j--;
}
counter[nybble][j+1] = tempMax;
order[nybble][j+1] = tempOrder;
}
for (j = 0x1f; j > 0x1e; j--)
{
//emit LOG_I("Nybble: " + QString::number(nybble) + " Predicted key: 0x" + QString::number(order[nybble][j], 16) + " Count: " + QString::number(counter[nybble][j]), true, true);
k4 += (order[nybble][0x1f] & 0xf) << (12 - (nybble * 4));
}
}
emit LOG_I("Predicted k4: 0x" + QString::number(k4, 16), true, true);
emit LOG_I("Moving on to k1", true, true);
// now getting k1
for (nybble = 0; nybble < 4; nybble++) for (subkey = 0; subkey < 0x20; subkey++) counter[nybble][subkey] = 0;
total = 0;
for (j = 0; j < 0x20000; j+=4) // 0x20000
{
if (!alreadyExists[j/4])
{
total++;
plainText = ((unencryptedFileData[j] << 24) & 0xFF000000) + ((unencryptedFileData[j+1] << 16) & 0xFF0000) + ((unencryptedFileData[j+2] << 8) & 0xFF00) + (unencryptedFileData[j+3] & 0xFF);
cipherText = ((encryptedFileData[j] << 24) & 0xFF000000) + ((encryptedFileData[j+1] << 16) & 0xFF0000) + ((encryptedFileData[j+2] << 8) & 0xFF00) + (encryptedFileData[j+3] & 0xFF);
x4 = cipherText & 0xFFFF;
fOutcome = fFunction(x4, k4);
x3Text = ((cipherText >> 16) & 0xffff) ^ fOutcome;
x1 = plainText & 0xFFFF;
for(nybble = 0; nybble < 4; nybble++)
{
uint8_t p = get_bit(plainText, outBits[nybble][0]+16) ^ get_bit(plainText, outBits[nybble][1]+16);
uint8_t c = get_bit(x3Text, outBits[nybble][0]+16) ^ get_bit(x3Text, outBits[nybble][1]+16);
for(subkey = 0; subkey < 0x20; subkey++)
{
k1 = subkey << (12 - (nybble * 4));
if ((nybble == 0) && (subkey > 0xf)) k1 += 0x01;
fOutcome = fFunction(x1, k1);
x2Text = ((plainText >> 16) & 0xffff) ^ fOutcome;
//emit LOG_I("plaintext = " + QString::number(plainText, 16) + " ciphertext = " + QString::number(cipherText, 16) + " x3text = " + QString::number(x3Text, 16), true, true);
uint8_t x2_bits = get_bit(x2Text, inBits[nybble][0]) ^ get_bit(x2Text, inBits[nybble][1]);
uint8_t z = p ^ c ^ x2_bits;
//emit LOG_I("p3:" + QString::number(p3, 16) + " p15:" + QString::number(p15, 16) + " p16:" + QString::number(p16, 16) + " p28:" + QString::number(p28, 16) + " p29:" + QString::number(p29, 16) + " c19:" + QString::number(c19, 16) + " c31:" + QString::number(c31, 16) + " c32:" + QString::number(c32, 16) + " x3_28:" + QString::number(x3_28, 16) + " x3_29:" + QString::number(x3_29, 16), true, true);
if (z == 0) counter[nybble][subkey]++;
}
}
}
//if ((j % 3000) == 0) emit LOG_I("Unique plaintext / ciphertext pair tested: " + QString::number(total), true, true);
}
for(nybble = 0; nybble < 4; nybble++)
{
for (subkey = 0; subkey < 0x20; subkey++)
{
counter[nybble][subkey] = abs(counter[nybble][subkey] - total/2);
order[nybble][subkey] = subkey;
}
}
k1 = 0;
for (nybble = 0; nybble < 4; nybble++)
{
//uint32_t correctKey = ((keys[0] + ((keys[0] & 0x01) << 16)) >> (12 - (nybble * 4))) & 0x1f;
//emit LOG_I("Nybble: " + QString::number(nybble) + " Correct key: 0x" + QString::number(correctKey, 16) + " Count: " + QString::number(counter[nybble][correctKey]), true, true);
int tempMax, tempOrder;
for (subkey = 1; subkey < 0x20; subkey++)
{
tempMax = counter[nybble][subkey];
tempOrder = order[nybble][subkey];
j = subkey - 1;
while (j >= 0 && counter[nybble][j] > tempMax)
{
counter[nybble][j+1] = counter[nybble][j];
order[nybble][j+1] = order[nybble][j];
j--;
}
counter[nybble][j+1] = tempMax;
order[nybble][j+1] = tempOrder;
}
for (j = 0x1f; j > 0x1e; j--)
{
//emit LOG_I("Nybble: " + QString::number(nybble) + " Predicted key: 0x" + QString::number(order[nybble][j], 16) + " Count: " + QString::number(counter[nybble][j]), true, true);
k1 += (order[nybble][0x1f] & 0xf) << (12 - (nybble * 4));
}
}
emit LOG_I("Predicted k1: 0x" + QString::number(k1, 16), true, true);
emit LOG_I("Moving on to k2", true, true);
// k2 using last plaintext, ciphertext pair
x2Text = ((plainText >> 16) & 0xffff) ^ fFunction(plainText & 0xffff, k1);
x3Text = ((cipherText >> 16) & 0xffff) ^ fFunction(cipherText & 0xffff, k4);
//emit LOG_I("Plaintext: " + QString::number(plainText, 16) + " Ciphertext: " + QString::number(cipherText, 16), true, true);
//emit LOG_I("x2Text: " + QString::number(x2Text, 16) + " x3 Text: " + QString::number(x3Text, 16), true, true);
for (k2 = 0; k2 < 0x10000; k2++)
{
if ((fFunction(x2Text, k2) ^ (plainText & 0xffff)) == x3Text) break;
}
emit LOG_I("Predicted k2: 0x" + QString::number(k2, 16), true, true);
emit LOG_I("Moving on to k3", true, true);
// k3 using last plaintext, ciphertext pair
for (k3 = 0; k3 < 0x10000; k3++)
{
if ((fFunction(x3Text, k3) ^ (cipherText & 0xffff)) == x2Text) break;
}
emit LOG_I("Predicted k3: 0x" + QString::number(k3, 16), true, true);
emit LOG_I("End Time", true, true);
return STATUS_SUCCESS;
}
uint8_t GetKeyOperationsSubaru::get_bit(uint32_t value, int bit_num)
{
return (value >> (32 - bit_num)) & 0x01;
}
int GetKeyOperationsSubaru::linear_approx_test()
{
uint16_t cIndexOfMax, dIndexOfMax;
uint16_t **approxTable = new uint16_t*[0x20];
for(int i = 0; i < 0x20; i++) approxTable[i] = new uint16_t[0x10];
uint16_t c, d;
for (c = 0; c < 0x10; c++)
for (d = 0; d < 0x20; d++)
approxTable[d][c] = 0;
findApprox(approxTable);
for (c = 0; c < 0x10; c++)
for (d = 0; d < 0x20; d++)
emit LOG_I("Results of Linear Approx: ," + QString::number(approxTable[d][c]) + "," + QString::number(d) + "," + QString::number(c), true, true);
return STATUS_SUCCESS;
}
uint16_t GetKeyOperationsSubaru::applyMask(uint16_t value, uint16_t mask)
{
uint16_t interValue = value & mask;
uint16_t cum = 0;
uint16_t bitValue;
while (interValue > 0)
{
bitValue = interValue % 2;
interValue /= 2;
cum = cum ^ bitValue;
}
return cum;
}
uint32_t GetKeyOperationsSubaru::manyRoundAndFlip(uint32_t input, uint16_t *keys, int numRounds)
{
int n;
uint32_t temp = input;
for(n = 0; n < numRounds; n++) temp = roundAndFlip(temp, keys[n]);
return temp;
}
uint32_t GetKeyOperationsSubaru::roundAndFlip(uint32_t input, uint16_t keyInput)
{
uint32_t roundOutcome;
roundOutcome = roundFunction(input, keyInput);
roundOutcome = flipLeftRight(roundOutcome);
return roundOutcome;
}
uint32_t GetKeyOperationsSubaru::flipLeftRight(uint32_t flipInput)
{
return (flipInput >> 16) + (flipInput << 16);
}
uint32_t GetKeyOperationsSubaru::roundFunction(uint32_t roundInput, uint16_t keyInput)
{
uint16_t highWord, lowWord, fBoxOutcome, highRoundOutcome, lowRoundOutcome;
highWord = roundInput >> 16;
lowWord = roundInput & 0xFFFF;
fBoxOutcome = fFunction(lowWord, keyInput);
highRoundOutcome = highWord ^ fBoxOutcome;
lowRoundOutcome = lowWord;
return (highRoundOutcome << 16) + lowRoundOutcome;
}
uint16_t GetKeyOperationsSubaru::fFunction(uint16_t wordInput, uint16_t keyInput)
{
int n;
uint16_t fBoxOutcome = 0;
uint32_t temp;
temp = keyInput ^ wordInput;
temp += temp << 16;
for (n = 0; n < 4; n++) fBoxOutcome += sBox((temp >> (n * 4)) & 0x1F) << (n * 4);
fBoxOutcome = (fBoxOutcome >> 3) + (fBoxOutcome << 13);
return fBoxOutcome;
}
uint16_t GetKeyOperationsSubaru::sBox(uint16_t sBoxInput)
{
const uint8_t indextransformation[]={
0x5, 0x6, 0x7, 0x1, 0x9, 0xC, 0xD, 0x8,
0xA, 0xD, 0x2, 0xB, 0xF, 0x4, 0x0, 0x3,
0xB, 0x4, 0x6, 0x0, 0xF, 0x2, 0xD, 0x9,
0x5, 0xC, 0x1, 0xA, 0x3, 0xD, 0xE, 0x8
};
return indextransformation[sBoxInput];
}
void GetKeyOperationsSubaru::findApprox(uint16_t **approxTable)
{
uint16_t c, d, e;
for (c = 0; c < 0x10; c++)
{
emit LOG_I("Got to: " + QString::number(c), true, true);
for (d = 0; d < 0x20; d++)
{
for (e = 0; e < 0x20; e++)
{
if (applyMask(e, d) ^ applyMask(sBox(e), c) == 0)
{
approxTable[d][c]++;
//emit LOG_I(QString::number(d) + "," + QString::number(c) + "," + QString::number(approxTable[d][c]), true, true);
}
}
}
}
}