int main(){
printf("Please give the value of the sbox output\n");
int sbox[16];
int i,j;
for(i=0;i<16;i++){
scanf("%d",&sbox[i]);
//printf("%d\t",sbox[i]);
}
data input[16];
data output[16];
for(i=0;i<16;i++){
input[i] = convertToData(i);
output[i] = convertToData(sbox[i]);
}
int diffMatrix[16][16];
for(i=0;i<16;i++){
for(j=0;j<16;j++){
diffMatrix[i][j]=matrixEntry(i,j,input,output);
printf("%d\t",diffMatrix[i][j]);
}
printf("\n");
}
printf("\n");
}
//Function used for applying reverse substitution function using sboxes
bitString substitution(bitString k,bitString a){
int i;
int sbox1[16] = {3,8,15,1,10,6,5,11,14,13,4,2,7,0,9,12};
int sbox2[16] = {15,12,2,7,9,0,5,10,1,11,14,8,6,13,3,4};
int sbox3[16] = {8,6,7,9,3,12,10,15,13,1,14,4,0,11,5,2};
int sbox4[16] = {0,15,11,8,12,9,6,3,13,1,2,4,10,7,5,14};
//int sbox5[16] = {0,15,11,8,12,9,6,3,13,1,2,4,10,7,5,14};
int sbox5[16] = {1,15,8,3,12,0,11,6,2,5,4,10,9,14,7,13};
data m[8];int e[8];data d[8];
for(i=0;i<8;i++){
m[i]= bitStringToData(k,4*i);
e[i]= sbox5[converttoint(m[i])];
d[i]= convertToData(e[i]);
}
//BitString used to select the correct combination of sboxes
bitString b = intToBitstring(e[0],e[1],e[2],e[3],e[4],e[5],e[6],e[7]);
data initial[8];//Divide the input bitstring into 8 parts of 4 bits each
int middle[8]; //Pass the each 4-bit box into corresponding sbox and get the new output
data final[8]; //Converting the integer to bitstring format
for(i=0;i<8;i++){
initial[i] = bitStringToData(a,4*i);
if(d[i].a3==0&&d[i].a2==0)
middle[i]=getIndex(sbox1,converttoint(initial[i]));
if(d[i].a3==0&&d[i].a2==1)
middle[i]=getIndex(sbox2,converttoint(initial[i]));
if(d[i].a3==1&&d[i].a2==0)
middle[i]=getIndex(sbox3,converttoint(initial[i]));
if(d[i].a3==1&&d[i].a2==1)
middle[i]=getIndex(sbox4,converttoint(initial[i]));
final[i]= convertToData(middle[i]);
}
int matrixEntry(int a, int b,data* input, data* output){
int results[16],i,count=0;
data temp1 = convertToData(a);
for(i=0;i<16;i++){
data x = input[i];
data y = output[i];
data x1 = XORdata(x,temp1);
int x1Num = converttoint(x1);
data y1 = output[x1Num];
data res = XORdata(y,y1);
if(converttoint(res)==b)
count++;
}
return count;
}
//Function used for converting set of 8 integers to a bitstring
bitString intToBitstring(int e1,int e2,int e3,int e4,int e5,int e6,int e7,int e8){
data d[8];
d[0] = convertToData(e1);
d[1] = convertToData(e2);
d[2] = convertToData(e3);
d[3] = convertToData(e4);
d[4] = convertToData(e5);
d[5] = convertToData(e6);
d[6] = convertToData(e7);
d[7] = convertToData(e8);
bitString b;
int i,j;
for(i=0;i<8;i++){
b.a[4*i] = d[i].a3;
b.a[4*i+1] = d[i].a2;
b.a[4*i+2] = d[i].a1;
b.a[4*i+3] = d[i].a0;
}
return b;
}
int main(void)
{
int i;
for (i = 0; i < 800; i++)
{
receivedData[i] = 0;
}
// init IO
DDRB |= (1 << OUTPUT_PIN); // Set the output pin
DDRC &= ~(1 << INPUT_PIN); // Set the input pin
PORTC |= (1 << INPUT_PIN); // Enable pull-up resistor
/*TCCR0A |= (1 << WGM01); // Set the Timer Mode to CTC
OCR0A = 0x7D; // Set the value that you want to count to
TIMSK0 |= (1 << OCIE0A); //Set the ISR COMPA vect
sei(); //enable interrupts
TCCR0B |= (1 << CS02); // set prescaler to 256 and start the timer*/
/* USART INIT START */
USART0Init();
stdout =& usart0_output;
stdin =& usart0_input;
/* USART INIT STOP */
SPIInit(); // Init the SPI bus
//char input[100] = "Now, this is a story all about how My life got flipped-turned upside down";
char input[100] = "";
printf("\n\n\n\nSTART CODE WITH THIS INPUT: %s\n\n", input); // Print the input string
uint8_t* dataToSend = fillDataArray(input); // Convert data to base2
unsigned int time;
time = (1000 / OUTPUT_BAUDRATE) * dataLength;
printf("Baudtime: %i\n", 1000/OUTPUT_BAUDRATE);
printf("Time needed to send: %i ms\n", time);
sendData(dataToSend);
printf("datalength: %i\n", dataLength);
char* received = convertToData(receivedData, dataLength); // Convert base2 to data
if (received[0] == -1)
{
printf("Error detected...\n");
}
else
{
printf("\nReceived data: %s\n\n", received); // Print the received data
}
printf("Entering loop now....\n");
PORTB &= ~(1 << OUTPUT_PIN);
while (1)
{
// Main loop
}
}
