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[4sem] isaip03 done

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Andrew Nuark G 2021-05-08 12:18:10 +07:00
parent 451bc1bfdb
commit 99bde2d946
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4sem/isaip/03/AESCryptor/aes_cryptor/lib/aes/aes_crypt.dart Normal file
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library aes_crypt;
import "dart:math";
import "dart:typed_data";
part "src/aes.dart";
part "src/aes_facade.dart";
part "src/utils.dart";

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4sem/isaip/03/AESCryptor/aes_cryptor/lib/aes/src/aes.dart Normal file
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part of aes_crypt;
// This is AES 256 CBC port from PHP phpAES library to Dart lang
// https://github.com/phillipsdata/phpaes
class _AES {
// The S-Box substitution table.
static final Uint8List _sBox = Uint8List.fromList([
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
]);
// The inverse S-Box substitution table.
static final Uint8List _invSBox = Uint8List.fromList([
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
]);
// Log table based on 0xe5
static final Uint8List _ltable = Uint8List.fromList([
0x00, 0xff, 0xc8, 0x08, 0x91, 0x10, 0xd0, 0x36,
0x5a, 0x3e, 0xd8, 0x43, 0x99, 0x77, 0xfe, 0x18,
0x23, 0x20, 0x07, 0x70, 0xa1, 0x6c, 0x0c, 0x7f,
0x62, 0x8b, 0x40, 0x46, 0xc7, 0x4b, 0xe0, 0x0e,
0xeb, 0x16, 0xe8, 0xad, 0xcf, 0xcd, 0x39, 0x53,
0x6a, 0x27, 0x35, 0x93, 0xd4, 0x4e, 0x48, 0xc3,
0x2b, 0x79, 0x54, 0x28, 0x09, 0x78, 0x0f, 0x21,
0x90, 0x87, 0x14, 0x2a, 0xa9, 0x9c, 0xd6, 0x74,
0xb4, 0x7c, 0xde, 0xed, 0xb1, 0x86, 0x76, 0xa4,
0x98, 0xe2, 0x96, 0x8f, 0x02, 0x32, 0x1c, 0xc1,
0x33, 0xee, 0xef, 0x81, 0xfd, 0x30, 0x5c, 0x13,
0x9d, 0x29, 0x17, 0xc4, 0x11, 0x44, 0x8c, 0x80,
0xf3, 0x73, 0x42, 0x1e, 0x1d, 0xb5, 0xf0, 0x12,
0xd1, 0x5b, 0x41, 0xa2, 0xd7, 0x2c, 0xe9, 0xd5,
0x59, 0xcb, 0x50, 0xa8, 0xdc, 0xfc, 0xf2, 0x56,
0x72, 0xa6, 0x65, 0x2f, 0x9f, 0x9b, 0x3d, 0xba,
0x7d, 0xc2, 0x45, 0x82, 0xa7, 0x57, 0xb6, 0xa3,
0x7a, 0x75, 0x4f, 0xae, 0x3f, 0x37, 0x6d, 0x47,
0x61, 0xbe, 0xab, 0xd3, 0x5f, 0xb0, 0x58, 0xaf,
0xca, 0x5e, 0xfa, 0x85, 0xe4, 0x4d, 0x8a, 0x05,
0xfb, 0x60, 0xb7, 0x7b, 0xb8, 0x26, 0x4a, 0x67,
0xc6, 0x1a, 0xf8, 0x69, 0x25, 0xb3, 0xdb, 0xbd,
0x66, 0xdd, 0xf1, 0xd2, 0xdf, 0x03, 0x8d, 0x34,
0xd9, 0x92, 0x0d, 0x63, 0x55, 0xaa, 0x49, 0xec,
0xbc, 0x95, 0x3c, 0x84, 0x0b, 0xf5, 0xe6, 0xe7,
0xe5, 0xac, 0x7e, 0x6e, 0xb9, 0xf9, 0xda, 0x8e,
0x9a, 0xc9, 0x24, 0xe1, 0x0a, 0x15, 0x6b, 0x3a,
0xa0, 0x51, 0xf4, 0xea, 0xb2, 0x97, 0x9e, 0x5d,
0x22, 0x88, 0x94, 0xce, 0x19, 0x01, 0x71, 0x4c,
0xa5, 0xe3, 0xc5, 0x31, 0xbb, 0xcc, 0x1f, 0x2d,
0x3b, 0x52, 0x6f, 0xf6, 0x2e, 0x89, 0xf7, 0xc0,
0x68, 0x1b, 0x64, 0x04, 0x06, 0xbf, 0x83, 0x38
]);
// Inverse log table
static final Uint8List _atable = Uint8List.fromList([
0x01, 0xe5, 0x4c, 0xb5, 0xfb, 0x9f, 0xfc, 0x12,
0x03, 0x34, 0xd4, 0xc4, 0x16, 0xba, 0x1f, 0x36,
0x05, 0x5c, 0x67, 0x57, 0x3a, 0xd5, 0x21, 0x5a,
0x0f, 0xe4, 0xa9, 0xf9, 0x4e, 0x64, 0x63, 0xee,
0x11, 0x37, 0xe0, 0x10, 0xd2, 0xac, 0xa5, 0x29,
0x33, 0x59, 0x3b, 0x30, 0x6d, 0xef, 0xf4, 0x7b,
0x55, 0xeb, 0x4d, 0x50, 0xb7, 0x2a, 0x07, 0x8d,
0xff, 0x26, 0xd7, 0xf0, 0xc2, 0x7e, 0x09, 0x8c,
0x1a, 0x6a, 0x62, 0x0b, 0x5d, 0x82, 0x1b, 0x8f,
0x2e, 0xbe, 0xa6, 0x1d, 0xe7, 0x9d, 0x2d, 0x8a,
0x72, 0xd9, 0xf1, 0x27, 0x32, 0xbc, 0x77, 0x85,
0x96, 0x70, 0x08, 0x69, 0x56, 0xdf, 0x99, 0x94,
0xa1, 0x90, 0x18, 0xbb, 0xfa, 0x7a, 0xb0, 0xa7,
0xf8, 0xab, 0x28, 0xd6, 0x15, 0x8e, 0xcb, 0xf2,
0x13, 0xe6, 0x78, 0x61, 0x3f, 0x89, 0x46, 0x0d,
0x35, 0x31, 0x88, 0xa3, 0x41, 0x80, 0xca, 0x17,
0x5f, 0x53, 0x83, 0xfe, 0xc3, 0x9b, 0x45, 0x39,
0xe1, 0xf5, 0x9e, 0x19, 0x5e, 0xb6, 0xcf, 0x4b,
0x38, 0x04, 0xb9, 0x2b, 0xe2, 0xc1, 0x4a, 0xdd,
0x48, 0x0c, 0xd0, 0x7d, 0x3d, 0x58, 0xde, 0x7c,
0xd8, 0x14, 0x6b, 0x87, 0x47, 0xe8, 0x79, 0x84,
0x73, 0x3c, 0xbd, 0x92, 0xc9, 0x23, 0x8b, 0x97,
0x95, 0x44, 0xdc, 0xad, 0x40, 0x65, 0x86, 0xa2,
0xa4, 0xcc, 0x7f, 0xec, 0xc0, 0xaf, 0x91, 0xfd,
0xf7, 0x4f, 0x81, 0x2f, 0x5b, 0xea, 0xa8, 0x1c,
0x02, 0xd1, 0x98, 0x71, 0xed, 0x25, 0xe3, 0x24,
0x06, 0x68, 0xb3, 0x93, 0x2c, 0x6f, 0x3e, 0x6c,
0x0a, 0xb8, 0xce, 0xae, 0x74, 0xb1, 0x42, 0xb4,
0x1e, 0xd3, 0x49, 0xe9, 0x9c, 0xc8, 0xc6, 0xc7,
0x22, 0x6e, 0xdb, 0x20, 0xbf, 0x43, 0x51, 0x52,
0x66, 0xb2, 0x76, 0x60, 0xda, 0xc5, 0xf3, 0xf6,
0xaa, 0xcd, 0x9a, 0xa0, 0x75, 0x54, 0x0e, 0x01
]);
// The number of 32-bit words comprising the plaintext and columns comprising the state matrix of an AES cipher.
static const int _Nb = 4;
// The number of 32-bit words comprising the cipher key in this AES cipher.
static const int _Nk = 8;
// The number of rounds in this AES cipher.
static const int _Nr = 16;
// The key schedule in this AES cipher.
Uint32List _w; // _Nb*(_Nr+1) 32-bit words
final List<Uint8List> _state = List.generate(4, (i) => Uint8List(4), growable:false);
// The encryption key
Uint8List _key;
// The initialization vector used in advanced cipher modes
Uint8List _iv;
_AES() {
_iv = Uint8List(0);
_key = Uint8List(0);
_w = Uint32List(_Nb*(_Nr+1));
}
// Sets AES encryption key [key] and the initialization vector [iv].
//
// ignore: non_constant_identifier_names
void SetKeys(Uint8List key, Uint8List iv) {
assert(key.length == 32, "Invalid key length for AES. Provided ${key.length * 8} bits, expected 256 bits.");
assert(iv.length == 16, "Invalid IV length for AES. The initialization vector must be 128 bits long.");
_key = Uint8List.fromList(key);
_iv = (iv == null || iv.isEmpty)? Uint8List(0) : Uint8List.fromList(iv);
_keyExpansion(_key); // places expanded key in w
}
// Encrypts binary data [data] with AES algorithm.
//
// ignore: non_constant_identifier_names
Uint8List Encrypt(Uint8List data) {
assert(_key != null && _key.isNotEmpty, "AES encryption key is null or empty.");
assert(data.length % 16 == 0, "Invalid data length for AES: ${data.length} bytes.");
Uint8List encData = Uint8List(data.length);
Uint8List t = Uint8List(16);
Uint8List block16 = Uint8List.fromList(_iv);
for (int i = 0; i < data.length; i += 16) {
for (int j = 0; j < 16; ++j) {
// For CBC, XOR this block of plaintext with the initialization vector
t[j] = ((i+j) < data.length? data[i+j] : 0) ^ block16[j];
}
block16 = encryptBlock(t);
encData.setRange(i, i+16, block16);
}
return encData;
}
// Decrypts binary data [data] encrypted with AES algorithm.
//
// ignore: non_constant_identifier_names
Uint8List Decrypt(Uint8List data) {
assert(_key != null && _key.isNotEmpty, "AES encryption key is null or empty.");
assert(data.length % 16 == 0, "Invalid data length for AES: ${data.length} bytes.");
Uint8List decData = Uint8List(data.length); // returned decrypted data;
Uint8List t = Uint8List(16); // 16-byte block
Uint8List xBlock;
Uint8List block16 = Uint8List.fromList(_iv); // 16-byte block to hold the temporary output of the cipher
for (int i = 0; i < data.length; i += 16) {
for (int j = 0; j < 16; ++j) {
if ((i+j) < data.length) { t[j] = data[i+j]; }
else { t[j] = 0; }
}
xBlock = decryptBlock(t);
// For CBC, XOR the iv(previous cipher) block with this decrypted cipher block
for (int j = 0; j < 16; ++j) {
xBlock[j] = xBlock[j] ^ block16[j];
}
block16 = Uint8List.fromList(t);
decData.setRange(i, i+16, xBlock);
}
return decData;
}
// Encrypts the 16-byte data block.
Uint8List encryptBlock(Uint8List data) {
Uint8List encBlock = Uint8List(16);
int i;
// place input data into the initial state matrix in column order
for (i = 0; i < 4*_Nb; ++i) {
_state[i % 4][(i - i%_Nb) ~/ _Nb] = data[i];
}
// add round key
_addRoundKey(0);
for (i = 1; i < _Nr; ++i) {
// substitute bytes
_subBytes();
// shift rows
_shiftRows();
// mix columns
_mixColumns();
// add round key
_addRoundKey(i);
}
// substitute bytes
_subBytes();
// shift rows
_shiftRows();
// add round key
_addRoundKey(i);
// place state matrix _state into encBlock in column order
for (i = 0; i < 4*_Nb; ++i) {
encBlock[i] = _state[i % 4][(i - i%_Nb) ~/ _Nb];
}
return encBlock;
}
// Decrypts the 16-byte data block.
Uint8List decryptBlock(Uint8List data) {
Uint8List decBlock = Uint8List(16);
int i;
// place input data into the initial state matrix in column order
for (i = 0; i < 4*_Nb; ++i) {
_state[i % 4][(i - i%_Nb) ~/ _Nb] = data[i];
}
// add round key
_addRoundKey(_Nr);
for (i = _Nr-1; i > 0; --i) {
// inverse shift rows
_invShiftRows();
// inverse sub bytes
_invSubBytes();
// add round key
_addRoundKey(i);
// inverse mix columns
_invMixColumns();
}
// inverse shift rows
_invShiftRows();
// inverse sub bytes
_invSubBytes();
// add round key
_addRoundKey(i);
// place state matrix s into decBlock in column order
for (i = 0; i < 4*_Nb; ++i) {
decBlock[i] = _state[i % 4][(i - i%_Nb) ~/ _Nb];
}
return decBlock;
}
// Expands small key to big one
void _keyExpansion(Uint8List key) {
const rconBase = [ 0x00000000,
0x01000000, 0x02000000, 0x04000000, 0x08000000,
0x10000000, 0x20000000, 0x40000000, 0x80000000,
0x1b000000, 0x36000000, 0x6c000000, 0xd8000000,
0xab000000, 0x4d000000, 0x9a000000, 0x2f000000
];
int temp;
int i;
// the first _Nk words of w are the cipher key z
for (i = 0; i < _Nk; ++i) {
_w[i] = key.buffer.asByteData().getUint32(i*4);
}
while (i < _Nb*(_Nr+1)) {
temp = _w[i-1];
if (i % _Nk == 0) {
temp = _subWord(_rotWord(temp)) ^ rconBase[i ~/ _Nk];
} else if (_Nk > 6 && i%_Nk == 4) {
temp = _subWord(temp);
}
_w[i] = (_w[i-_Nk] ^ temp) & 0xFFFFFFFF;
++i;
}
}
// Adds the key schedule for a round to a state matrix.
void _addRoundKey(int round) {
int temp;
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < _Nb; ++j) {
// place the i-th byte of the j-th word from expanded key w into temp
temp = (_w[round*_Nb + j] >> (3-i)*8) & 0xFF;
_state[i][j] ^= temp;
}
}
}
// Mixes each column of a state matrix.
void _mixColumns() {
int s0; int s1; int s2; int s3;
// There are _Nb columns
for (int i = 0; i < _Nb; ++i) {
s0 = _state[0][i];
s1 = _state[1][i];
s2 = _state[2][i];
s3 = _state[3][i];
_state[0][i] = _mult(0x02, s0) ^ _mult(0x03, s1) ^ _mult(0x01, s2) ^ _mult(0x01, s3);
_state[1][i] = _mult(0x01, s0) ^ _mult(0x02, s1) ^ _mult(0x03, s2) ^ _mult(0x01, s3);
_state[2][i] = _mult(0x01, s0) ^ _mult(0x01, s1) ^ _mult(0x02, s2) ^ _mult(0x03, s3);
_state[3][i] = _mult(0x03, s0) ^ _mult(0x01, s1) ^ _mult(0x01, s2) ^ _mult(0x02, s3);
}
}
// Unmixes each column of a state matrix.
void _invMixColumns() {
int s0; int s1; int s2; int s3;
// There are _Nb columns
for (int i = 0; i < _Nb; ++i) {
s0 = _state[0][i];
s1 = _state[1][i];
s2 = _state[2][i];
s3 = _state[3][i];
_state[0][i] = _mult(0x0e, s0) ^ _mult(0x0b, s1) ^ _mult(0x0d, s2) ^ _mult(0x09, s3);
_state[1][i] = _mult(0x09, s0) ^ _mult(0x0e, s1) ^ _mult(0x0b, s2) ^ _mult(0x0d, s3);
_state[2][i] = _mult(0x0d, s0) ^ _mult(0x09, s1) ^ _mult(0x0e, s2) ^ _mult(0x0b, s3);
_state[3][i] = _mult(0x0b, s0) ^ _mult(0x0d, s1) ^ _mult(0x09, s2) ^ _mult(0x0e, s3);
}
}
// Applies a cyclic shift to the last 3 rows of a state matrix.
void _shiftRows() {
var temp = List<int>(_Nb);
for (int i = 1; i < 4; ++i) {
for (int j = 0; j < _Nb; ++j) {
temp[j] = _state[i][(j+i) % _Nb];
}
for (int j = 0; j < _Nb; ++j) {
_state[i][j] = temp[j];
}
}
}
// Applies an inverse cyclic shift to the last 3 rows of a state matrix.
void _invShiftRows() {
var temp = List<int>(_Nb);
for (int i = 1; i < 4; ++i) {
for (int j = 0; j < _Nb; ++j) {
temp[(i+j) % _Nb] = _state[i][j];
}
for (int j = 0; j < _Nb; ++j) {
_state[i][j] = temp[j];
}
}
}
// Applies S-Box substitution to each byte of a state matrix.
void _subBytes() {
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < _Nb; ++j) {
_state[i][j] = _sBox[_state[i][j]];
}
}
}
// Applies inverse S-Box substitution to each byte of a state matrix.
void _invSubBytes() {
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < _Nb; ++j) {
_state[i][j] = _invSBox[_state[i][j]];
}
}
}
// Multiplies two polynomials a(x), b(x) in GF(2^8) modulo the irreducible polynomial m(x) = x^8+x^4+x^3+x+1
int _mult(int a, int b) {
int sum = _ltable[a] + _ltable[b];
sum %= 255;
// Get the inverse log
sum = _atable[sum];
return (a == 0? 0 : (b == 0? 0:sum));
}
// Applies a cyclic permutation to a 4-byte word.
int _rotWord(int w) => ((w << 8) & 0xFFFFFFFF) | ((w >> 24) & 0xFF);
// Applies S-box substitution to each byte of a 4-byte word.
int _subWord(int w) {
int temp = 0;
// loop through 4 bytes of a word
for (int i = 0; i < 4; ++i) {
temp = (w >> 24) & 0xFF; // put the first 8-bits into temp
w = ((w << 8) & 0xFFFFFFFF) | _sBox[temp]; // add the substituted byte back
}
return w;
}
}

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4sem/isaip/03/AESCryptor/aes_cryptor/lib/aes/src/aes_facade.dart Normal file
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part of aes_crypt;
// Facade class for encryption and decryption methods and algorithms.
class AESCrypt {
final _secureRandom = Random.secure();
final _aes = _AES();
// Creates random encryption key of [length] bytes long.
Uint8List createKey([int length = 32]) {
return Uint8List.fromList(List<int>.generate(length, (i) => _secureRandom.nextInt(256)));
}
// Creates random initialization vector.
Uint8List createIV() => createKey(16);
// Sets AES encryption key [key] and the initialization vector [iv].
void setKeys(Uint8List key, Uint8List iv) => _aes.SetKeys(key, iv);
// Encrypts binary data [data] with AES algorithm.
//
// ignore: non_constant_identifier_names
Uint8List Encrypt(Uint8List data) => _aes.Encrypt(data);
// Decrypts binary data [data] encrypted with AES algorithm.
//
// ignore: non_constant_identifier_names
Uint8List Decrypt(Uint8List data) => _aes.Decrypt(data);
}

76
4sem/isaip/03/AESCryptor/aes_cryptor/lib/aes/src/utils.dart Normal file
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part of aes_crypt;
// ignore: non_constant_identifier_names
Uint8List StringToBytes(String string) {
List<int> _data = [];
string.codeUnits.forEach((hexB) {
_data.addAll([
(hexB & 0xff00) >> 8,
hexB & 0x00ff
]);
});
return Uint8List.fromList(_data);
}
// ignore: non_constant_identifier_names
String BytesToString(Uint8List bytes) {
assert(bytes.length % 2 == 0, "This method requires even data input!");
String string = "";
for (int i = 0; i < bytes.length; i += 2) {
string += String.fromCharCode((bytes[i] << 8) + bytes[i+1]);
}
return string;
}
// ignore: non_constant_identifier_names
Uint8List KeyFromString(String strKey) {
var runes = strKey.runes.toList(growable: false);
Uint8List base = Uint8List(32);
for (int i = 0; i < 32; i++) {
base[i] = runes[i % runes.length];
}
return base;
}
// ignore: non_constant_identifier_names
String PadString(String originalStr) {
if (originalStr.length % 16 == 0) {
return originalStr;
}
var width = originalStr.length + 16 - (originalStr.length % 16);
return originalStr.padRight(width, "`");
}
// ignore: non_constant_identifier_names
String UnpadString(String originalStr) {
while (originalStr.endsWith("`")) {
originalStr = originalStr.substring(0, originalStr.length-1);
}
return originalStr;
}
// ignore: non_constant_identifier_names
String BytesToHexString(Uint8List list) {
StringBuffer str = StringBuffer();
list.forEach((item) {
str.write(item.toRadixString(16).toUpperCase().padLeft(2, '0'));
str.write(" ");
});
return str.toString();
}
// ignore: non_constant_identifier_names
Uint8List HexStringToBytes(String hexString) {
hexString = hexString.replaceAll(" ", "");
assert(hexString.length % 2 == 0, "This method requires even data input!");
var rxp = new RegExp(r".{2}");
Iterable<Match> matches = rxp.allMatches(hexString);
var bytes = matches.map((m) => int.parse(m.group(0), radix: 16)).toList();
return Uint8List.fromList(bytes);
}

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4sem/isaip/03/AESCryptor/aes_cryptor/lib/main.dart Normal file
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import 'dart:typed_data';
import 'package:aes_cryptor/aes/aes_crypt.dart';
import "package:flutter/material.dart";
import "package:window_size/window_size.dart";
void main() async {
WidgetsFlutterBinding.ensureInitialized();
const currSize = const Size(1280, 720);
setWindowMinSize(currSize);
runApp(App());
}
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: "AES Cryptor",
theme: ThemeData.dark(),
home: MainPage(),
);
}
}
class MainPage extends StatefulWidget {
MainPage({Key key}) : super(key: key);
final cryptor = AESCrypt();
@override
_MainPageState createState() => _MainPageState();
}
class _MainPageState extends State<MainPage> {
// ignore: non_constant_identifier_names
TextEditingController _iv_controller;
// ignore: non_constant_identifier_names
TextEditingController _key_controller;
// ignore: non_constant_identifier_names
TextEditingController _plain_input_controller;
// ignore: non_constant_identifier_names
TextEditingController _cypher_input_controller;
// ignore: non_constant_identifier_names
Uint8List aes_key, iv;
void _generateInitialVector() {
_cypher_input_controller.clear();
iv = widget.cryptor.createIV();
_iv_controller.text = _toString(iv);
if (aes_key != null && aes_key.isNotEmpty) {
widget.cryptor.setKeys(aes_key, iv);
}
}
String _toString(Uint8List data) {
return (data != null && data.isNotEmpty) ? BytesToHexString(data) : "";
}
void _showSnack(String text) {
ScaffoldMessenger.of(context)
..removeCurrentSnackBar()
..showSnackBar(SnackBar(
content: Text(text),
));
}
void _secretKeyChanged(String newData) {
_cypher_input_controller.clear();
if (newData.isEmpty) {
aes_key = null;
_showSnack("Cleared key");
return;
}
aes_key = KeyFromString(newData);
if (iv != null && iv.isNotEmpty) {
widget.cryptor.setKeys(aes_key, iv);
}
_showSnack("Hex value of key: ${_toString(aes_key)}");
}
void _plainTextChanged(String newData) {
if (iv == null || aes_key == null || iv.isEmpty || aes_key.isEmpty) {
_showSnack("Key or IV is empty, or both.");
return;
}
var encData = widget.cryptor.Encrypt(StringToBytes(PadString(newData)));
_cypher_input_controller.text = BytesToHexString(encData);
}
void _cypherTextChanged(String newData) {
if (iv == null || aes_key == null || iv.isEmpty || aes_key.isEmpty) {
_showSnack("Key or IV is empty, or both.");
return;
}
var encData = HexStringToBytes(newData);
var decData = widget.cryptor.Decrypt(encData);
var decStr = UnpadString(BytesToString(decData));
_plain_input_controller.text = decStr;
}
@override
void initState() {
super.initState();
_iv_controller = TextEditingController();
_key_controller = TextEditingController();
_plain_input_controller = TextEditingController();
_cypher_input_controller = TextEditingController();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("AES Cryptor"),
),
body: Container(
padding: EdgeInsets.all(16),
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
TextFormField(
controller: _key_controller,
onFieldSubmitted: _secretKeyChanged,
cursorColor: Theme.of(context).textSelectionTheme.cursorColor,
maxLength: 32,
decoration: InputDecoration(
icon: Icon(Icons.vpn_key),
labelText: "Secret key",
enabledBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Color(0xFF6200EE)),
),
),
),
SizedBox(height: 32),
Row(
children: [
Expanded(
child: GestureDetector(
onDoubleTap: _generateInitialVector,
child: TextFormField(
controller: _iv_controller,
enabled: false,
cursorColor: Theme.of(context).textSelectionTheme.cursorColor,
decoration: InputDecoration(
icon: Icon(Icons.shield),
labelText: "Initial Vector",
errorText: "Double click, to regenerate",
border: OutlineInputBorder(),
errorStyle: TextStyle(
color: Theme.of(context).disabledColor, // or any other color
),
),
),
),
),
],
),
SizedBox(height: 32),
Row(
mainAxisSize: MainAxisSize.max,
children: [
Expanded(
child: TextFormField(
keyboardType: TextInputType.multiline,
maxLines: 13,
controller: _plain_input_controller,
onChanged: _plainTextChanged,
cursorColor: Theme.of(context).textSelectionTheme.cursorColor,
decoration: InputDecoration(
labelText: "Plain text",
floatingLabelBehavior: FloatingLabelBehavior.always,
border: OutlineInputBorder(),
),
),
),
SizedBox(width: 32),
Expanded(
child: TextFormField(
keyboardType: TextInputType.multiline,
maxLines: 13,
controller: _cypher_input_controller,
onChanged: _cypherTextChanged,
cursorColor: Theme.of(context).textSelectionTheme.cursorColor,
decoration: InputDecoration(
labelText: "Cypher text",
floatingLabelBehavior: FloatingLabelBehavior.always,
border: OutlineInputBorder(),
),
),
),
],
)
],
),
),
),
);
}
}