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AES128.java
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package re.bytecode.obfuscat.samples;
// AES-128
public class AES128 {
// Original Version from
// Ported and modified from C
// https://github.com/kokke/tiny-AES-c/blob/master/aes.c
private static final int Nb = 4;
private static final int Nk = 4;
private static final int Nr = 10;
private static final byte sbox[] = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0x63, 0x7c, 0x77, 0x7b, (byte) 0xf2, 0x6b, 0x6f, (byte) 0xc5, 0x30, 0x01, 0x67, 0x2b, (byte) 0xfe,
(byte) 0xd7, (byte) 0xab, 0x76, (byte) 0xca, (byte) 0x82, (byte) 0xc9, 0x7d, (byte) 0xfa, 0x59, 0x47,
(byte) 0xf0, (byte) 0xad, (byte) 0xd4, (byte) 0xa2, (byte) 0xaf, (byte) 0x9c, (byte) 0xa4, 0x72,
(byte) 0xc0, (byte) 0xb7, (byte) 0xfd, (byte) 0x93, 0x26, 0x36, 0x3f, (byte) 0xf7, (byte) 0xcc, 0x34,
(byte) 0xa5, (byte) 0xe5, (byte) 0xf1, 0x71, (byte) 0xd8, 0x31, 0x15, 0x04, (byte) 0xc7, 0x23, (byte) 0xc3,
0x18, (byte) 0x96, 0x05, (byte) 0x9a, 0x07, 0x12, (byte) 0x80, (byte) 0xe2, (byte) 0xeb, 0x27, (byte) 0xb2,
0x75, 0x09, (byte) 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, (byte) 0xa0, 0x52, 0x3b, (byte) 0xd6, (byte) 0xb3,
0x29, (byte) 0xe3, 0x2f, (byte) 0x84, 0x53, (byte) 0xd1, 0x00, (byte) 0xed, 0x20, (byte) 0xfc, (byte) 0xb1,
0x5b, 0x6a, (byte) 0xcb, (byte) 0xbe, 0x39, 0x4a, 0x4c, 0x58, (byte) 0xcf, (byte) 0xd0, (byte) 0xef,
(byte) 0xaa, (byte) 0xfb, 0x43, 0x4d, 0x33, (byte) 0x85, 0x45, (byte) 0xf9, 0x02, 0x7f, 0x50, 0x3c,
(byte) 0x9f, (byte) 0xa8, 0x51, (byte) 0xa3, 0x40, (byte) 0x8f, (byte) 0x92, (byte) 0x9d, 0x38, (byte) 0xf5,
(byte) 0xbc, (byte) 0xb6, (byte) 0xda, 0x21, 0x10, (byte) 0xff, (byte) 0xf3, (byte) 0xd2, (byte) 0xcd, 0x0c,
0x13, (byte) 0xec, 0x5f, (byte) 0x97, 0x44, 0x17, (byte) 0xc4, (byte) 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19,
0x73, 0x60, (byte) 0x81, 0x4f, (byte) 0xdc, 0x22, 0x2a, (byte) 0x90, (byte) 0x88, 0x46, (byte) 0xee,
(byte) 0xb8, 0x14, (byte) 0xde, 0x5e, 0x0b, (byte) 0xdb, (byte) 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24,
0x5c, (byte) 0xc2, (byte) 0xd3, (byte) 0xac, 0x62, (byte) 0x91, (byte) 0x95, (byte) 0xe4, 0x79, (byte) 0xe7,
(byte) 0xc8, 0x37, 0x6d, (byte) 0x8d, (byte) 0xd5, 0x4e, (byte) 0xa9, 0x6c, 0x56, (byte) 0xf4, (byte) 0xea,
0x65, 0x7a, (byte) 0xae, 0x08, (byte) 0xba, 0x78, 0x25, 0x2e, 0x1c, (byte) 0xa6, (byte) 0xb4, (byte) 0xc6,
(byte) 0xe8, (byte) 0xdd, 0x74, 0x1f, 0x4b, (byte) 0xbd, (byte) 0x8b, (byte) 0x8a, 0x70, 0x3e, (byte) 0xb5,
0x66, 0x48, 0x03, (byte) 0xf6, 0x0e, 0x61, 0x35, 0x57, (byte) 0xb9, (byte) 0x86, (byte) 0xc1, 0x1d,
(byte) 0x9e, (byte) 0xe1, (byte) 0xf8, (byte) 0x98, 0x11, 0x69, (byte) 0xd9, (byte) 0x8e, (byte) 0x94,
(byte) 0x9b, 0x1e, (byte) 0x87, (byte) 0xe9, (byte) 0xce, 0x55, 0x28, (byte) 0xdf, (byte) 0x8c, (byte) 0xa1,
(byte) 0x89, 0x0d, (byte) 0xbf, (byte) 0xe6, 0x42, 0x68, 0x41, (byte) 0x99, 0x2d, 0x0f, (byte) 0xb0, 0x54,
(byte) 0xbb, 0x16 };
private static final byte rsbox[] = { 0x52, 0x09, 0x6a, (byte) 0xd5, 0x30, 0x36, (byte) 0xa5, 0x38, (byte) 0xbf,
0x40, (byte) 0xa3, (byte) 0x9e, (byte) 0x81, (byte) 0xf3, (byte) 0xd7, (byte) 0xfb, 0x7c, (byte) 0xe3, 0x39,
(byte) 0x82, (byte) 0x9b, 0x2f, (byte) 0xff, (byte) 0x87, 0x34, (byte) 0x8e, 0x43, 0x44, (byte) 0xc4,
(byte) 0xde, (byte) 0xe9, (byte) 0xcb, 0x54, 0x7b, (byte) 0x94, 0x32, (byte) 0xa6, (byte) 0xc2, 0x23, 0x3d,
(byte) 0xee, 0x4c, (byte) 0x95, 0x0b, 0x42, (byte) 0xfa, (byte) 0xc3, 0x4e, 0x08, 0x2e, (byte) 0xa1, 0x66,
0x28, (byte) 0xd9, 0x24, (byte) 0xb2, 0x76, 0x5b, (byte) 0xa2, 0x49, 0x6d, (byte) 0x8b, (byte) 0xd1, 0x25,
0x72, (byte) 0xf8, (byte) 0xf6, 0x64, (byte) 0x86, 0x68, (byte) 0x98, 0x16, (byte) 0xd4, (byte) 0xa4, 0x5c,
(byte) 0xcc, 0x5d, 0x65, (byte) 0xb6, (byte) 0x92, 0x6c, 0x70, 0x48, 0x50, (byte) 0xfd, (byte) 0xed,
(byte) 0xb9, (byte) 0xda, 0x5e, 0x15, 0x46, 0x57, (byte) 0xa7, (byte) 0x8d, (byte) 0x9d, (byte) 0x84,
(byte) 0x90, (byte) 0xd8, (byte) 0xab, 0x00, (byte) 0x8c, (byte) 0xbc, (byte) 0xd3, 0x0a, (byte) 0xf7,
(byte) 0xe4, 0x58, 0x05, (byte) 0xb8, (byte) 0xb3, 0x45, 0x06, (byte) 0xd0, 0x2c, 0x1e, (byte) 0x8f,
(byte) 0xca, 0x3f, 0x0f, 0x02, (byte) 0xc1, (byte) 0xaf, (byte) 0xbd, 0x03, 0x01, 0x13, (byte) 0x8a, 0x6b,
0x3a, (byte) 0x91, 0x11, 0x41, 0x4f, 0x67, (byte) 0xdc, (byte) 0xea, (byte) 0x97, (byte) 0xf2, (byte) 0xcf,
(byte) 0xce, (byte) 0xf0, (byte) 0xb4, (byte) 0xe6, 0x73, (byte) 0x96, (byte) 0xac, 0x74, 0x22, (byte) 0xe7,
(byte) 0xad, 0x35, (byte) 0x85, (byte) 0xe2, (byte) 0xf9, 0x37, (byte) 0xe8, 0x1c, 0x75, (byte) 0xdf, 0x6e,
0x47, (byte) 0xf1, 0x1a, 0x71, 0x1d, 0x29, (byte) 0xc5, (byte) 0x89, 0x6f, (byte) 0xb7, 0x62, 0x0e,
(byte) 0xaa, 0x18, (byte) 0xbe, 0x1b, (byte) 0xfc, 0x56, 0x3e, 0x4b, (byte) 0xc6, (byte) 0xd2, 0x79, 0x20,
(byte) 0x9a, (byte) 0xdb, (byte) 0xc0, (byte) 0xfe, 0x78, (byte) 0xcd, 0x5a, (byte) 0xf4, 0x1f, (byte) 0xdd,
(byte) 0xa8, 0x33, (byte) 0x88, 0x07, (byte) 0xc7, 0x31, (byte) 0xb1, 0x12, 0x10, 0x59, 0x27, (byte) 0x80,
(byte) 0xec, 0x5f, 0x60, 0x51, 0x7f, (byte) 0xa9, 0x19, (byte) 0xb5, 0x4a, 0x0d, 0x2d, (byte) 0xe5, 0x7a,
(byte) 0x9f, (byte) 0x93, (byte) 0xc9, (byte) 0x9c, (byte) 0xef, (byte) 0xa0, (byte) 0xe0, 0x3b, 0x4d,
(byte) 0xae, 0x2a, (byte) 0xf5, (byte) 0xb0, (byte) 0xc8, (byte) 0xeb, (byte) 0xbb, 0x3c, (byte) 0x83, 0x53,
(byte) 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, (byte) 0xba, 0x77, (byte) 0xd6, 0x26, (byte) 0xe1, 0x69, 0x14,
0x63, 0x55, 0x21, 0x0c, 0x7d };
private static final byte Rcon[] = { (byte) 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, (byte) 0x80, 0x1b,
0x36 };
private static byte getSBoxValue(byte num) {
return sbox[num & 0xFF];
}
private static void KeyExpansion(byte[] RoundKey, byte[] Key) {
int i, j, k;
byte[] tempa = new byte[4]; // Used for the column/row operations
// The first round key is the key itself.
for (i = 0; i < Nk; ++i) {
RoundKey[(i * 4) + 0] = Key[(i * 4) + 0];
RoundKey[(i * 4) + 1] = Key[(i * 4) + 1];
RoundKey[(i * 4) + 2] = Key[(i * 4) + 2];
RoundKey[(i * 4) + 3] = Key[(i * 4) + 3];
}
// All other round keys are found from the previous round keys.
for (i = Nk; i < Nb * (Nr + 1); ++i) {
{
k = (i - 1) * 4;
tempa[0] = RoundKey[k + 0];
tempa[1] = RoundKey[k + 1];
tempa[2] = RoundKey[k + 2];
tempa[3] = RoundKey[k + 3];
}
if (i % Nk == 0) {
{
byte u8tmp = tempa[0];
tempa[0] = tempa[1];
tempa[1] = tempa[2];
tempa[2] = tempa[3];
tempa[3] = u8tmp;
}
{
tempa[0] = getSBoxValue(tempa[0]);
tempa[1] = getSBoxValue(tempa[1]);
tempa[2] = getSBoxValue(tempa[2]);
tempa[3] = getSBoxValue(tempa[3]);
}
tempa[0] = (byte) (tempa[0] ^ Rcon[i / Nk]);
}
j = i * 4;
k = (i - Nk) * 4;
RoundKey[j + 0] = (byte) (RoundKey[k + 0] ^ tempa[0]);
RoundKey[j + 1] = (byte) (RoundKey[k + 1] ^ tempa[1]);
RoundKey[j + 2] = (byte) (RoundKey[k + 2] ^ tempa[2]);
RoundKey[j + 3] = (byte) (RoundKey[k + 3] ^ tempa[3]);
}
}
private static void AES_init_ctx(byte[] RoundKey, byte[] key) {
KeyExpansion(RoundKey, key);
}
private static void AddRoundKey(byte round, byte[] state, byte[] RoundKey) {
int i, j;
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j) {
state[i * 4 + j] ^= RoundKey[(round * Nb * 4) + (i * Nb) + j];
}
}
}
private static void SubBytes(byte[] state) {
int i, j;
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j) {
state[i * 4 + j] = getSBoxValue(state[i * 4 + j]);
}
}
}
private static void ShiftRows(byte[] state) {
byte temp;
temp = state[0 * 4 + 1];
state[0 * 4 + 1] = state[1 * 4 + 1];
state[1 * 4 + 1] = state[2 * 4 + 1];
state[2 * 4 + 1] = state[3 * 4 + 1];
state[3 * 4 + 1] = temp;
temp = state[0 * 4 + 2];
state[0 * 4 + 2] = state[2 * 4 + 2];
state[2 * 4 + 2] = temp;
temp = state[1 * 4 + 2];
state[1 * 4 + 2] = state[3 * 4 + 2];
state[3 * 4 + 2] = temp;
temp = state[0 * 4 + 3];
state[0 * 4 + 3] = state[3 * 4 + 3];
state[3 * 4 + 3] = state[2 * 4 + 3];
state[2 * 4 + 3] = state[1 * 4 + 3];
state[1 * 4 + 3] = temp;
}
private static byte xtime(byte x) {
return (byte) ((x << 1) ^ (((x >> 7) & 1) * 0x1b));
}
private static void MixColumns(byte[] state) {
int i;
byte Tmp, Tm, t;
for (i = 0; i < 4; ++i) {
t = state[i * 4 + 0];
Tmp = (byte) (state[i * 4 + 0] ^ state[i * 4 + 1] ^ state[i * 4 + 2] ^ state[i * 4 + 3]);
Tm = (byte) (state[i * 4 + 0] ^ state[i * 4 + 1]);
Tm = xtime(Tm);
state[i * 4 + 0] ^= Tm ^ Tmp;
Tm = (byte) (state[i * 4 + 1] ^ state[i * 4 + 2]);
Tm = xtime(Tm);
state[i * 4 + 1] ^= Tm ^ Tmp;
Tm = (byte) (state[i * 4 + 2] ^ state[i * 4 + 3]);
Tm = xtime(Tm);
state[i * 4 + 2] ^= Tm ^ Tmp;
Tm = (byte) (state[i * 4 + 3] ^ t);
Tm = xtime(Tm);
state[i * 4 + 3] ^= Tm ^ Tmp;
}
}
private static byte Multiply(byte x, byte y) {
return (byte) (((y & 1) * x) ^ ((y >> 1 & 1) * xtime(x)) ^ ((y >> 2 & 1) * xtime(xtime(x)))
^ ((y >> 3 & 1) * xtime(xtime(xtime(x))))
^ ((y >> 4 & 1) * xtime(xtime(xtime(xtime(x)))))); /* this last call to xtime() can be omitted */
}
private static byte getSBoxInvert(byte num) {
return rsbox[num & 0xFF];
}
// MixColumns function mixes the columns of the state matrix.
// The method used to multiply may be difficult to understand for the
// inexperienced.
// Please use the references to gain more information.
private static void InvMixColumns(byte[] state) {
int i;
byte a, b, c, d;
for (i = 0; i < 4; ++i) {
a = state[i * 4 + 0];
b = state[i * 4 + 1];
c = state[i * 4 + 2];
d = state[i * 4 + 3];
state[i * 4 + 0] = (byte) (Multiply(a, (byte) 0x0e) ^ Multiply(b, (byte) 0x0b) ^ Multiply(c, (byte) 0x0d)
^ Multiply(d, (byte) 0x09));
state[i * 4 + 1] = (byte) (Multiply(a, (byte) 0x09) ^ Multiply(b, (byte) 0x0e) ^ Multiply(c, (byte) 0x0b)
^ Multiply(d, (byte) 0x0d));
state[i * 4 + 2] = (byte) (Multiply(a, (byte) 0x0d) ^ Multiply(b, (byte) 0x09) ^ Multiply(c, (byte) 0x0e)
^ Multiply(d, (byte) 0x0b));
state[i * 4 + 3] = (byte) (Multiply(a, (byte) 0x0b) ^ Multiply(b, (byte) 0x0d) ^ Multiply(c, (byte) 0x09)
^ Multiply(d, (byte) 0x0e));
}
}
// The SubBytes Function Substitutes the values in the
// state matrix with values in an S-box.
private static void InvSubBytes(byte[] state) {
int i, j;
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j) {
state[j * 4 + i] = getSBoxInvert(state[j * 4 + i]);
}
}
}
private static void InvShiftRows(byte[] state) {
byte temp;
temp = state[3 * 4 + 1];
state[3 * 4 + 1] = state[2 * 4 + 1];
state[2 * 4 + 1] = state[1 * 4 + 1];
state[1 * 4 + 1] = state[0 * 4 + 1];
state[0 * 4 + 1] = temp;
temp = state[0 * 4 + 2];
state[0 * 4 + 2] = state[2 * 4 + 2];
state[2 * 4 + 2] = temp;
temp = state[1 * 4 + 2];
state[1 * 4 + 2] = state[3 * 4 + 2];
state[3 * 4 + 2] = temp;
temp = state[0 * 4 + 3];
state[0 * 4 + 3] = state[1 * 4 + 3];
state[1 * 4 + 3] = state[2 * 4 + 3];
state[2 * 4 + 3] = state[3 * 4 + 3];
state[3 * 4 + 3] = temp;
}
private static void Cipher(byte[] state, byte[] RoundKey) {
int round = 0;
AddRoundKey((byte) 0, state, RoundKey);
for (round = 1;; ++round) {
SubBytes(state);
ShiftRows(state);
if (round == Nr) {
break;
}
MixColumns(state);
AddRoundKey((byte) round, state, RoundKey);
}
// Add round key to last round
AddRoundKey((byte) Nr, state, RoundKey);
}
private static void InvCipher(byte[] state, byte[] RoundKey) {
int round = 0;
AddRoundKey((byte) Nr, state, RoundKey);
for (round = (Nr - 1);; --round) {
InvShiftRows(state);
InvSubBytes(state);
AddRoundKey((byte) round, state, RoundKey);
if (round == 0) {
break;
}
InvMixColumns(state);
}
}
private static void AES_ECB_encrypt(byte[] RoundKey, byte[] buf) {
Cipher(buf, RoundKey);
}
private static void AES_ECB_decrypt(byte[] RoundKey, byte[] buf) {
InvCipher(buf, RoundKey);
}
public static int entry(byte[] message, int len) {
byte[] key = new byte[16];
for(int i=0;i<16;i++)
key[i] = (byte)i;
byte[] roundKey = new byte[176];
AES_init_ctx(roundKey, key);
int res = 0;
byte[] data = new byte[16];
for(int i=0;i<len;i+=16) {
for(int j=0;j<16;j++)
data[j] = 0;
for(int j=0;j<16 && j<(len-i);j++)
data[j] = message[i+j];
AES_ECB_encrypt(roundKey, data); // reencrypt it to test
AES_ECB_decrypt(roundKey, data); // if encrypt and decryption is symmetric
res ^= data[0];
}
return res;
}
}