Wednesday, July 30, 2014

AES Implementation in Java

AES.java

 
import java.util.Arrays;

public class AES {
 
 private static final int BITS = 16;
 private static final int ROUNDS = 10;
 private static final int NO_OF_WORDS_IN_KEY = 44;
 private static final int KEY_LENGTH = 16;
 private static final int BLOCK_LENGTH = 16;
 final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
 int[] RC = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36};
 Word[] Rcon = new Word[ROUNDS]; 
 private byte[] word = null;
 
 static final 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
 };
  
 static final 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
 };
  
 
 public AES() {
  for (int i = 0 ; i < ROUNDS ; i++) {
   Rcon[i] = new Word();
   byte[] temp = new byte[4];
   temp[0] = (byte) (RC[i] & 0xff);
   temp[1] = 0;
   temp[2] = 0;
   temp[3] = 0;
   Rcon[i].setWord(temp);   
  }
  word = new byte[NO_OF_WORDS_IN_KEY];
 }
 
 /* Ref: http://www.samiam.org/galois.html */
 /* Galois Addition*/
 byte gadd(byte a, byte b) {
  return (byte) ((a ^ b) & 0xff);
 }
 /* Galois Subtraction*/
 byte gsub(byte a, byte b) {
  return (byte) ((a ^ b) & 0xff);
 }
 /* Galois Multiplication*/
 byte gmul(byte a, byte b) {
  byte p = 0;
  int counter;
  byte high_bit_set;
  byte byte0x80 = hexStringToByteArray("80")[0];
  for (counter = 0 ; counter < 8 ; counter++) {
   if((b & 0x01) == 1) {
    //System.out.println("lower bit of b is set");
    p = (byte)((p ^ a) & 0xff);
   }   
   high_bit_set = (byte) (a & 0x80);
   //printByte("high_bit_set", high_bit_set);
   a <<= 1;
   if (high_bit_set == byte0x80) {
    //System.out.println("higher bit of a is set");
    a = (byte)((a ^ 0x1b) & 0xff);
   }
   b = (byte)((b >> 1) & 0x7f);
   
   //printByte("a", a);
   //printByte("b", b);
   //printByte("p", p);
  }
  return p;
 }
 
 byte gmul(byte a, int b) {
  byte t = (byte)(b & 0xff);
  return gmul(a, t);
 }
 
 /* Key Expansion */
 private byte[] expandKey(byte[] key) throws Exception {
  //System.out.println(key.length);
  //System.out.println(bytesToHex(key));
  if(key.length != KEY_LENGTH) {
   throw new Exception("Key should be of length, 128 bits");
  }
  Word[] w = new Word[NO_OF_WORDS_IN_KEY]; 
  Word temp;
  for (int i = 0; i < 4; i++) {
   w[i] = new Word(key[4*i], key[4*i+1], key[4*i+2], key[4*i+3]); 
   //System.out.println("w" + i + " = " + w[i]);
  }
  
  for (int i = 4; i < 44; i++) {
   temp = w[i-1];
   Word temp1 = new Word();
   temp1.setWord(temp.getWord());
   //System.out.println("w" + (i-1) + " = " + temp);
   if (i % 4 == 0) {
    temp1.rotWord();
    //System.out.println("Rot=" + temp1);
    temp1.subWord();
    //System.out.println("Sub=" + temp1);
    temp1 = Word.XORWords(temp1, Rcon[(i/4) - 1]);
    //System.out.println("Rcon" + temp1);
   }
   w[i] = Word.XORWords(w[i-4], temp1);
   //System.out.println("w" + i + " = " + w[i]);   
  }
  return Word.wordsToBytes(w);
 }
 
 /* Substitute Bytes */
 private byte[] subBytes(byte[] in) {
  byte[] out = new byte[BITS];
  for (int i = 0 ; i < BITS ; i++) {
   byte a = in[i];
   int row = (a >> 4) & 0x000F;
   int col = a & 0x000F;   
   out[i] = (byte) sBox[row * BITS + col];
  }
  return out;
 }
 
 /* Inverse Substitute Bytes */
 private byte[] inverseSubBytes(byte[] in) {
  byte[] out = new byte[BITS];
  for (int i = 0 ; i < BITS ; i++) {
   byte a = in[i];
   int row = (a >> 4) & 0x000F;
   int col = a & 0x000F;   
   out[i] = (byte) invSBox[row * BITS + col];
  }
  return out;
 }
 
 /* Shift Rows */
 private byte[] shiftRows(byte[] in) {
  byte[] out = new byte[BITS];
  byte[] temp = new byte[BITS];
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    temp[4*j+i] = in[4*i+j];
   }
  }
  //System.out.println("temp: " + bytesToHex(temp));
  for (int i = 0 ; i < BITS/4 ; i++) {
   byte[] a = Arrays.copyOfRange(temp, (4 * i), (4 * i + 4));
   byte[] b = leftShift(a, i);
   in[4*i] = b[0];
   in[4*i+1] = b[1];
   in[4*i+2] = b[2];
   in[4*i+3] = b[3];
  }   
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    out[4*j+i] = in[4*i+j];
   }
  }
  return out;
 }
 
 private byte[] leftShift(byte[] in, int times) {
  byte[] out = new byte[4];
  out = Arrays.copyOfRange(in, 0, 4);
  for (int i = 0 ; i < times ; i++) {
   out[0] = in[1];
   out[1] = in[2];
   out[2] = in[3];
   out[3] = in[0];
   in = Arrays.copyOfRange(out, 0, 4);
  }
  return out;
 }
 
 /* Inverse Shift Rows */
 private byte[] inverseShiftRows(byte[] in) {
  byte[] out = new byte[BITS];
  byte[] temp = new byte[BITS];
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    temp[4*j+i] = in[4*i+j];
   }
  }
  for (int i = 0 ; i < BITS/4 ; i++) {
   byte[] a = Arrays.copyOfRange(temp, (4 * i), (4 * i + 4));
   byte[] b = rightShift(a, i);
   in[4 * i] = b[0];
   in[4 * i + 1] = b[1];
   in[4 * i + 2] = b[2];
   in[4 * i + 3] = b[3];
  }
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    out[4*j+i] = in[4*i+j];
   }
  }
  return out;
 }
 
 private byte[] rightShift(byte[] in, int times) {
  byte[] out = new byte[4];
  out = Arrays.copyOfRange(in, 0, 4);
  for (int i = 0 ; i < times ; i++) {
   out[0] = in[3];
   out[1] = in[0];
   out[2] = in[1];
   out[3] = in[2];
   in = Arrays.copyOfRange(out, 0, 4);
  }
  return out;
 }
 
 /* Mix Columns */
 private byte[] mixColumns(byte[] in) {
  byte[] out = new byte[BITS];
  byte[] temp = new byte[BITS];  
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    temp[4*j+i] = in[4*i+j];
   }
  }
  in = temp;
  for (int j = 0 ; j < BITS/4 ; j++) {
   out[4*0+j] = (byte) ((gmul(in[4*0+j], 2)  ^ gmul(in[4*1+j], 3)  ^ in[4*2+j]    ^ in[4*3+j])    & 0xff);
   out[4*1+j] = (byte) ((in[4*0+j]    ^ gmul(in[4*1+j], 2)  ^ gmul(in[4*2+j], 3)  ^ in[4*3+j])    & 0xff);
   out[4*2+j] = (byte) ((in[4*0+j]    ^ in[4*1+j]    ^ gmul(in[4*2+j], 2)  ^ gmul(in[4*3+j], 3))  & 0xff);
   out[4*3+j] = (byte) ((gmul(in[4*0+j], 3)  ^ in[4*1+j]    ^ in[4*2+j]    ^ gmul(in[4*3+j], 2))  & 0xff);
  }
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    temp[4*j+i] = out[4*i+j];
   }
  }
  out = temp;
  return out;
 }
 
 /* Inverse Mix Columns */
 private byte[] inverseMixColumns(byte[] in) {
  byte[] out = new byte[BITS];
  byte[] temp = new byte[BITS];  
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    temp[4*j+i] = in[4*i+j];
   }
  }
  in = temp;
  for (int j = 0 ; j < BITS/4 ; j++) {
   out[4*0+j] = (byte) ((gmul(in[4*0+j], 14)  ^ gmul(in[4*1+j], 11)  ^ gmul(in[4*2+j], 13)  ^ gmul(in[4*3+j], 9))  & 0xff);
   out[4*1+j] = (byte) ((gmul(in[4*0+j], 9)  ^ gmul(in[4*1+j], 14)  ^ gmul(in[4*2+j], 11)  ^ gmul(in[4*3+j], 13))  & 0xff);
   out[4*2+j] = (byte) ((gmul(in[4*0+j], 13)  ^ gmul(in[4*1+j], 9) ^ gmul(in[4*2+j], 14)  ^ gmul(in[4*3+j], 11))  & 0xff);
   out[4*3+j] = (byte) ((gmul(in[4*0+j], 11)  ^ gmul(in[4*1+j], 13) ^ gmul(in[4*2+j], 9) ^ gmul(in[4*3+j], 14))  & 0xff);
  }
  for (int i = 0 ; i < BITS/4 ; i++) {
   for (int j = 0 ; j < BITS/4 ; j++) {
    temp[4*j+i] = out[4*i+j];
   }
  }
  out = temp;
  return out;
 }
 
 private byte[] hexStringToByteArray(String string) {
  int length = string.length();
  int n = (int)Math.ceil((length + 1) / 2);
  byte[] result = new byte[n];  
  for (int i = length - 1; i >= 0 ; i -= 2) { 
   if (i == 0) {
    result[i / 2] = (byte) ((Character.digit('0', 16) << 4)
      + Character.digit(string.charAt(i), 16));
   } else {
    result[i / 2] = (byte) ((Character.digit(string.charAt(i - 1), 16) << 4)
     + Character.digit(string.charAt(i), 16));
   }
  }
  return result;
 }
 
 /* http://stackoverflow.com/questions/9655181/convert-from-byte-array-to-hex-string-in-java */
 public static String bytesToHex(byte[] bytes) {
     char[] hexChars = new char[bytes.length * 2];
     for ( int j = 0; j < bytes.length; j++ ) {
         int v = bytes[j] & 0xFF;
         hexChars[j * 2] = hexArray[v >>> 4];
         hexChars[j * 2 + 1] = hexArray[v & 0x0F];
     }
     return new String(hexChars);
 }
 
 private void printBytes(byte[] input) {    
  for (int i = 0 ; i < input.length; i++) {
   System.out.print(byteToBits(input[i]) + " ");
  }
  System.out.println();
 }
 
 private void printByte(String msg, byte input) {
  byte[] temp = new byte[1];
  temp[0] = input;
  System.out.println(msg + ": " + bytesToHex(temp));  
 }
 
 private String byteToBits(byte b) {
  StringBuffer buffer = new StringBuffer();
  for (int i = 0 ; i < 8 ; i++)
   buffer.append((int)(b >> (8-(i+1)) & 0x0001));
  return buffer.toString();
 }
 
 private byte[] getRoundKey(int round) {
  byte[] out = new byte[KEY_LENGTH];
  out = Arrays.copyOfRange(word, 16*round, 16*round+16);  
  return out;
 }
 
 public static byte[] XORBytes(byte[] in1, byte[] in2) {  
  byte[] out = new byte[BLOCK_LENGTH];
  for (int i = 0 ; i < BLOCK_LENGTH ; i++) {
   out[i] = (byte)((in1[i] ^ in2[i]) & 0xff);
  }   
  return out;
 }
 
 public byte[] encrypt(byte[] plainText, byte[] key) throws Exception {
  byte[] cipher = new byte[BLOCK_LENGTH];  
  this.word = expandKey(key);
  byte[] roundKey = getRoundKey(0);
  /* Round 0 */
  cipher = XORBytes(plainText, roundKey);
  //System.out.println("Round 0\n" + bytesToHex(cipher));
  /* Rounds 1 to 9*/
  for (int i = 1 ; i < 10 ; i++) {
   //System.out.println("Round " + i);
   cipher = subBytes(cipher);
   //System.out.println("SubBytes: " + bytesToHex(cipher));
   cipher = shiftRows(cipher);
   //System.out.println("ShiftRows: " + bytesToHex(cipher));
   cipher = mixColumns(cipher);
   //System.out.println("MixColumns: " + bytesToHex(cipher));
   roundKey = getRoundKey(i);
   //System.out.println("RoundKey: " + bytesToHex(roundKey));
   cipher = XORBytes(cipher, roundKey);   
   //System.out.println("CIPHER: " + bytesToHex(cipher));
  }
  /* Round 10*/
  //System.out.println("Round 10");
  cipher = subBytes(cipher);
  //System.out.println("SubBytes: " + bytesToHex(cipher));
  cipher = shiftRows(cipher);
  //System.out.println("ShiftRows: " + bytesToHex(cipher));
  roundKey = getRoundKey(10);
  //System.out.println("RoundKey: " + bytesToHex(roundKey));
  cipher = XORBytes(cipher, roundKey);
  //System.out.println("CIPHER: " + bytesToHex(cipher));
  return cipher;
 }
 
 public byte[] decrypt(byte[] cipher, byte[] key) throws Exception {
  byte[] plainText = new byte[BLOCK_LENGTH];  
  this.word = expandKey(key);
  byte[] roundKey = getRoundKey(10);
  /* Round 0 */
  plainText = XORBytes(cipher, roundKey);
  /* Rounds 1 to 9*/
  for (int i = 9 ; i > 0 ; i--) {
   plainText = inverseShiftRows(plainText);
   plainText = inverseSubBytes(plainText);
   roundKey = getRoundKey(i);
   plainText = XORBytes(plainText, roundKey);
   plainText = inverseMixColumns(plainText);
  }
  /* Round 10*/
  plainText = inverseShiftRows(plainText);
  plainText = inverseSubBytes(plainText);
  roundKey = getRoundKey(0);
  plainText = XORBytes(plainText, roundKey);
  return plainText;
 }
 
 public static void main(String[] args) throws Exception {
  AES aes = new AES();
  byte[] plainText = aes.hexStringToByteArray("0123456789abcdeffedcba9876543210");
  System.out.println("PLAIN TEXT: " + bytesToHex(plainText));
  byte[] key = aes.hexStringToByteArray("0f1571c947d9e8590cb7add6af7f6798");
  System.out.println("KEY: " + bytesToHex(key));
  byte[] cipher = aes.encrypt(plainText, key);
  System.out.println("CIPHER TEXT: " + bytesToHex(cipher)); 
  plainText = aes.decrypt(cipher, key);
  System.out.println("DECRYPTED CIPHER TEXT: " + bytesToHex(plainText));
    
 }
}
Word.java

 

public class Word {
 
 private byte[] word = null;
 
 public Word() {
  word = new byte[4];
 }
 
 public Word(byte k0, byte k1, byte k2, byte k3) {
  this();
  word[0] = k0;
  word[1] = k1;
  word[2] = k2;
  word[3] = k3;
 }
 
 public byte[] getWord() {
  return word;
 }
 
 public void setWord(byte[] word) {
  this.word = word;
 }
 
 public static byte[] wordToBytes(Word word) {
  return word.getWord();
 }
 
 public static byte[] wordsToBytes(Word[] words) {
  byte[] out = new byte[4 * words.length];
  for (int i = 0 ; i < words.length ; i++) {
   byte[] temp = words[i].getWord();
   out[4*i] = temp[0];
   out[4*i+1] = temp[1];
   out[4*i+2] = temp[2];
   out[4*i+3] = temp[3];   
  }
  return out;
 }
 
 public void rotWord() {
  byte[] temp = this.getWord();
  byte[] newWord = new byte[4];
  newWord[0] = temp[1];
  newWord[1] = temp[2];
  newWord[2] = temp[3];
  newWord[3] = temp[0]; 
  this.setWord(newWord);
 }
 
 public void subWord() {
  byte[] in = this.getWord();
  byte[] out = new byte[4];  
  for (int i = 0 ; i < 4 ; i++) {
   byte a = in[i];
   int row = (a >> 4) & 0x000F;
   int col = a & 0x000F;   
   out[i] = (byte) AES.sBox[row * 16 + col];
  }
  for (int i = 0 ; i < 4 ; i++) {
   this.word[i] = out[i];
  }  
 } 
 
 public static Word XORWords(Word word1, Word word2) {
  Word outWord = new Word();
  byte[] in1 = word1.getWord();
  byte[] in2 = word2.getWord();
  byte[] out = new byte[4];
  for (int i = 0 ; i < 4 ; i++) {
   out[i] = (byte)((in1[i] ^ in2[i]) & 0xff);
  }
  outWord.setWord(out);  
  return outWord;
 }
 
 public String toString() {
  return AES.bytesToHex(this.getWord());
 }
}

Output

PLAIN TEXT: 0123456789ABCDEFFEDCBA9876543210
KEY: 0F1571C947D9E8590CB7ADD6AF7F6798
CIPHER TEXT: FF0B844A0853BF7C6934AB4364148FB9
DECRYPTED CIPHER TEXT: 0123456789ABCDEFFEDCBA9876543210

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