Notes

import java.nio.ByteBuffer;
import java.util.Arrays;
import javax.xml.bind.DatatypeConverter;

public class Aes_Final_Boss{
int Nb = 4;
int Nk = 4; //for AES 128
int Nr = 10; //for AES 128
int[] K = new int[(Nr + 1) * Nb];
int[][] sbox = {{0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76},
{0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0},
{0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15},
{0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75},
{0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84},
{0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf},
{0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8},
{0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2},
{0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73},
{0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb},
{0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79},
{0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08},
{0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a},
{0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e},
{0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf},
{0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16}};

int[][] invsbox = {{0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb},
{0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb},
{0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e},
{0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25},
{0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92},
{0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84},
{0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06},
{0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b},
{0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73},
{0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e},
{0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b},
{0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4},
{0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f},
{0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef},
{0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61},
{0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d}};

int[] rcon = {0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000, 0x20000000, 0x40000000, 0x80000000, 0x1b000000, 0x36000000};

int[] mixVars = {0x02030101, 0x01020301, 0x01010203, 0x03010102};

int[] invMixVars = {0x0e0b0d09, 0x090e0b0d, 0x0d090e0b, 0x0b0d090e};


public byte fastMul(int a, int e){
while (e != 0x01){
int sign = (a >> 7) & 0x01;
a = (a << 1) & 0xFF;
if (sign == 1)
a = a ^ 0x1b;
e = e/2;
}
return (byte)a;
}

public byte xTimes(int a, int e){
int temp = 0x00;
for (int i = 7; i >0; i--){
if (((e >> i) & 0x01) == 1){
temp = temp ^ fastMul(a, (int)Math.pow(2, i));
}
}
if (e % 2 == 1)
temp = temp ^ a;
return (byte)temp;
}


public int [] transpose(int []k){

int i,j;
byte [][] bytes = new byte[4][4];
for (i=0;i<4;i++){
byte[] tmp = ByteBuffer.allocate(4).putInt(k[i]).array();
for (j=0;j<4;j++)
bytes[j][i] = tmp[j];

}

for (i=0; i<4;i++)
k[i] = ByteBuffer.wrap(bytes[i]).getInt();

return k;
}

public int SubWord(int val){
int[] a = new int[4];
int ret = 0;
byte[] bytearray = new byte[4];
for(int j = 0; j < 4; j++)
a[j] = (val >> (3 - j)*8) & 0xFF;


for(int i = 0; i < 4; i++){
bytearray[i] = (byte) sbox[a[i] >> 4][a[i] & 0xF];

ret = ByteBuffer.wrap(bytearray).getInt();
//System.out.println(Integer.toHexString(ret));

}
return ret;
}
public int[] stateSubWord(int[] state){
int[] tmp = new int[4];
for(int i = 0; i< 4; i++)
ret[i] = SubWord(state[i]);

return tmp;
}




public void printState(int[] state){
for(int j = 0; j < 4; j++)
System.out.println(Integer.toHexString(state[j]));
}



/***
* The bytes in the last three rows of the State are cyclically
* shifted over different numbers of bytes
* @param state
* @return state
*/
public int[] shiftRows(int[] state) {
int []tstate = transpose(state);
for (int i=0;i<4;i++)
tstate [i]=RotateLeft(tstate[i], i*8);
tstate =transpose(tstate);
return tstate;
}


public int[] mixColumns(int[] state){
int[] tstate = transpose(state);
int[] nstate = new int[4];
int[] column = new int[4];
byte[][] matrix = new byte[4][4];
byte[][] mixVarsMatrix = new byte[4][4];

for(int i = 0 ; i < 4; i++){
for(int j = 0; j < 4; j++){
mixVarsMatrix[i][j] = (byte) (mixVars[i] >> (3 - j)*8 & 0xFF);
}
}

for (int i = 0; i < 4; ++i) {
for(int j = 0; j < 4; j++){
column[j] = (tstate[j] >> (3 - i)*8 & 0xFF);
}
for(int j = 0; j < 4; j++){
matrix[j][i] = (fastMul(column[0], mixVarsMatrix[j][0]));

for(int k = 1; k < 4; k++){
matrix[j][i] ^= (fastMul(column[k], (int) mixVarsMatrix[j][k]));
}
}
}

for (int i = 0; i < 4; i++)
nstate[i] = ByteBuffer.wrap(matrix[i]).getInt();
return transpose(nstate);
}

public int[] invMixColumns(int[] state){
int[] tstate = transpose(state);
int[] nstate = new int[4];
int[] column = new int[4];
byte[][] matrix = new byte[4][4];
byte[][] invMixVarsMatrix = new byte[4][4];

for(int i = 0 ; i < 4; i++){
for(int j = 0; j < 4; j++){
invMixVarsMatrix[i][j] = (byte) (invMixVars[i] >> (3 - j)*8 & 0xFF);
}
}

for (int i = 0; i < 4; ++i) {
for(int j = 0; j < 4; j++){
column[j] = (tstate[j] >> (3 - i)*8 & 0xFF);
}
for(int j = 0; j < 4; j++){
matrix[j][i] = (fastMul(column[0], invMixVarsMatrix[j][0]));

for(int k = 1; k < 4; k++){
matrix[j][i] ^= (fastMul(column[k], (int) invMixVarsMatrix[j][k]));
}
}
}

for (int i = 0; i < 4; i++)
nstate[i] = ByteBuffer.wrap(matrix[i]).getInt();
return transpose(nstate);
}



public static int RotateLeft(int w, int n){
return Integer.rotateLeft(w, n);
}


public static void main (String[]args){


int[]state = {0x63cab704,0x0953d051,0xcd60e0e7,0xba70e18c};

Aes_Final_Boss b = new Aes_Final_Boss();

System.out.println("Original staten");
b.printState(state);




System.out.println("nRow Shiftn");
state = b.shiftRows(state);
b.printState(state);

System.out.println("nMix Columnsn");
b.printState(b.mixColumns(state));


}
/*
State:

→
After shifting:
0x6353e08c
0x0960e104
0xcd70b751
0xbacad0e7
*/
}