├── AES.cpp
├── AES.h
├── README
└── Test.cpp


/AES.cpp:
--------------------------------------------------------------------------------
  1 | /*
  2 | */
  3 | 
  4 | 
  5 | #include "AES.h"
  6 | #include <cstdio>
  7 | #include <cstring>
  8 | #include <cassert>
  9 | 
 10 | AES::AES(unsigned char* key)
 11 | {
 12 | 	unsigned char sBox[] =
 13 | 	{ /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f */ 
 14 | 		0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/  
 15 | 		0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/
 16 | 		0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/ 
 17 | 		0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/ 
 18 | 		0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/ 
 19 | 		0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/
 20 | 		0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/  
 21 | 		0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/ 
 22 | 		0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/ 
 23 | 		0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/ 
 24 | 		0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/
 25 | 		0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/
 26 | 		0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/ 
 27 | 		0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/
 28 | 		0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/ 
 29 | 		0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16  /*f*/
 30 | 	};
 31 | 	unsigned char invsBox[256] = 
 32 | 	{ /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f  */  
 33 | 		0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/ 
 34 | 		0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/
 35 | 		0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/ 
 36 | 		0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/ 
 37 | 		0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/ 
 38 | 		0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/ 
 39 | 		0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/ 
 40 | 		0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/
 41 | 		0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/ 
 42 | 		0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/
 43 | 		0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/
 44 | 		0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/ 
 45 | 		0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/ 
 46 | 		0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/ 
 47 | 		0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/ 
 48 | 		0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d  /*f*/
 49 | 	}; 
 50 | 	memcpy(Sbox, sBox, 256);
 51 | 	memcpy(InvSbox, invsBox, 256);
 52 | 	if (key != NULL) {
 53 | 		KeyExpansion(key, w);
 54 | 	}
 55 | }
 56 | 
 57 | AES::~AES()
 58 | {
 59 | 
 60 | }
 61 | 
 62 | void AES::SetKey (unsigned char *key) {
 63 | 	KeyExpansion(key, w);
 64 | }
 65 | 
 66 | unsigned char* AES::Cipher(unsigned char* input, unsigned char *output)
 67 | {
 68 | 	unsigned char state[4][4];
 69 | 	int i,r,c;
 70 | 
 71 | 	for(r=0; r<4; r++)
 72 | 	{
 73 | 		for(c=0; c<4 ;c++)
 74 | 		{
 75 | 			state[r][c] = input[c*4+r];
 76 | 		}
 77 | 	}
 78 | 
 79 | 	AddRoundKey(state,w[0]);
 80 | 
 81 | 	for(i=1; i<=10; i++)
 82 | 	{
 83 | 		SubBytes(state);
 84 | 		ShiftRows(state);
 85 | 		if(i!=10)MixColumns(state);
 86 | 		AddRoundKey(state,w[i]);
 87 | 	}
 88 | 
 89 | 	for(r=0; r<4; r++)
 90 | 	{
 91 | 		for(c=0; c<4 ;c++)
 92 | 		{
 93 | 			output[c*4+r] = state[r][c];
 94 | 		}
 95 | 	}
 96 | 
 97 | 	return output;
 98 | }
 99 | 
100 | unsigned char* AES::InvCipher(unsigned char* input, unsigned char *output)
101 | {
102 | 	unsigned char state[4][4];
103 | 	int i,r,c;
104 | 
105 | 	for(r=0; r<4; r++)
106 | 	{
107 | 		for(c=0; c<4 ;c++)
108 | 		{
109 | 			state[r][c] = input[c*4+r];
110 | 		}
111 | 	}
112 | 
113 | 	AddRoundKey(state, w[10]);
114 | 	for(i=9; i>=0; i--)
115 | 	{
116 | 		InvShiftRows(state);
117 | 		InvSubBytes(state);
118 | 		AddRoundKey(state, w[i]);
119 | 		if(i)
120 | 		{
121 | 			InvMixColumns(state);
122 | 		}
123 | 	}
124 | 	
125 | 	for(r=0; r<4; r++)
126 | 	{
127 | 		for(c=0; c<4 ;c++)
128 | 		{
129 | 			output[c*4+r] = state[r][c];
130 | 		}
131 | 	}
132 | 	return output;
133 | }
134 | 
135 | void* AES::Cipher(void* input,  void *output, int length)
136 | {
137 | 	unsigned char* in = (unsigned char*) input;
138 | 	unsigned char* out = (unsigned char*) output;
139 | 	int i;
140 | 	if(!length)
141 | 	{
142 | 		while(*(in+length++));
143 | 		in = (unsigned char*) input;
144 | 	}
145 | 	for(i=0; i<length; i+=16)
146 | 	{
147 | 		Cipher(in+i, out+i);
148 | 	}
149 | 	return output;
150 | }
151 | 
152 | void* AES::InvCipher(void* input, void* output, int length)
153 | {
154 | 	unsigned char* in = (unsigned char*) input;
155 | 	unsigned char* out = (unsigned char*) output;
156 | 	int i;
157 | 	for(i=0; i<length; i+=16)
158 | 	{
159 | 		InvCipher(in+i, out+i);
160 | 	}
161 | 	return output;
162 | }
163 | 
164 | void AES::KeyExpansion(unsigned char* key, unsigned char w[][4][4])
165 | {
166 | 	int i,j,r,c;
167 | 	unsigned char rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
168 | 	for(r=0; r<4; r++)
169 | 	{
170 | 		for(c=0; c<4; c++)
171 | 		{
172 | 			w[0][r][c] = key[r+c*4];
173 | 		}
174 | 	}
175 | 	for(i=1; i<=10; i++)
176 | 	{
177 | 		for(j=0; j<4; j++)
178 | 		{
179 | 			unsigned char t[4];
180 | 			for(r=0; r<4; r++)
181 | 			{
182 | 				t[r] = j ? w[i][r][j-1] : w[i-1][r][3];
183 | 			}
184 | 			if(j == 0)
185 | 			{
186 | 				unsigned char temp = t[0];
187 | 				for(r=0; r<3; r++)
188 | 				{
189 | 					t[r] = Sbox[t[(r+1)%4]];
190 | 				}
191 | 				t[3] = Sbox[temp];
192 | 				t[0] ^= rc[i-1];
193 | 			}
194 | 			for(r=0; r<4; r++)
195 | 			{
196 | 				w[i][r][j] = w[i-1][r][j] ^ t[r];
197 | 			}
198 | 		}
199 | 	}
200 | }
201 | 
202 | unsigned char AES::FFmul(unsigned char a, unsigned char b)
203 | {
204 | 	unsigned char bw[4];
205 | 	unsigned char res=0;
206 | 	int i;
207 | 	bw[0] = b;
208 | 	for(i=1; i<4; i++)
209 | 	{
210 | 		bw[i] = bw[i-1]<<1;
211 | 		if(bw[i-1]&0x80)
212 | 		{
213 | 			bw[i]^=0x1b;
214 | 		}
215 | 	}
216 | 	for(i=0; i<4; i++)
217 | 	{
218 | 		if((a>>i)&0x01)
219 | 		{
220 | 			res ^= bw[i];
221 | 		}
222 | 	}
223 | 	return res;
224 | }
225 | 
226 | void AES::SubBytes(unsigned char state[][4])
227 | {
228 | 	int r,c;
229 | 	for(r=0; r<4; r++)
230 | 	{
231 | 		for(c=0; c<4; c++)
232 | 		{
233 | 			state[r][c] = Sbox[state[r][c]];
234 | 		}
235 | 	}
236 | }
237 | 
238 | void AES::ShiftRows(unsigned char state[][4])
239 | {
240 | 	unsigned char t[4];
241 | 	int r,c;
242 | 	for(r=1; r<4; r++)
243 | 	{
244 | 		for(c=0; c<4; c++)
245 | 		{
246 | 			t[c] = state[r][(c+r)%4];
247 | 		}
248 | 		for(c=0; c<4; c++)
249 | 		{
250 | 			state[r][c] = t[c];
251 | 		}
252 | 	}
253 | }
254 | 
255 | void AES::MixColumns(unsigned char state[][4])
256 | {
257 | 	unsigned char t[4];
258 | 	int r,c;
259 | 	for(c=0; c< 4; c++)
260 | 	{
261 | 		for(r=0; r<4; r++)
262 | 		{
263 | 			t[r] = state[r][c];
264 | 		}
265 | 		for(r=0; r<4; r++)
266 | 		{
267 | 			state[r][c] = FFmul(0x02, t[r])
268 | 						^ FFmul(0x03, t[(r+1)%4])
269 | 						^ FFmul(0x01, t[(r+2)%4])
270 | 						^ FFmul(0x01, t[(r+3)%4]);
271 | 		}
272 | 	}
273 | }
274 | 
275 | void AES::AddRoundKey(unsigned char state[][4], unsigned char k[][4])
276 | {
277 | 	int r,c;
278 | 	for(c=0; c<4; c++)
279 | 	{
280 | 		for(r=0; r<4; r++)
281 | 		{
282 | 			state[r][c] ^= k[r][c];
283 | 		}
284 | 	}
285 | }
286 | 
287 | void AES::InvSubBytes(unsigned char state[][4])
288 | {
289 | 	int r,c;
290 | 	for(r=0; r<4; r++)
291 | 	{
292 | 		for(c=0; c<4; c++)
293 | 		{
294 | 			state[r][c] = InvSbox[state[r][c]];
295 | 		}
296 | 	}
297 | }
298 | 
299 | void AES::InvShiftRows(unsigned char state[][4])
300 | {
301 | 	unsigned char t[4];
302 | 	int r,c;
303 | 	for(r=1; r<4; r++)
304 | 	{
305 | 		for(c=0; c<4; c++)
306 | 		{
307 | 			t[c] = state[r][(c-r+4)%4];
308 | 		}
309 | 		for(c=0; c<4; c++)
310 | 		{
311 | 			state[r][c] = t[c];
312 | 		}
313 | 	}
314 | }
315 | 
316 | void AES::InvMixColumns(unsigned char state[][4])
317 | {
318 | 	unsigned char t[4];
319 | 	int r,c;
320 | 	for(c=0; c< 4; c++)
321 | 	{
322 | 		for(r=0; r<4; r++)
323 | 		{
324 | 			t[r] = state[r][c];
325 | 		}
326 | 		for(r=0; r<4; r++)
327 | 		{
328 | 			state[r][c] = FFmul(0x0e, t[r])
329 | 						^ FFmul(0x0b, t[(r+1)%4])
330 | 						^ FFmul(0x0d, t[(r+2)%4])
331 | 						^ FFmul(0x09, t[(r+3)%4]);
332 | 		}
333 | 	}
334 | }
335 | 
336 | /**************************************************************/
337 | //AESModeOfOperation
338 | 
339 | AESModeOfOperation::AESModeOfOperation() {
340 | 	m_mode = MODE_ECB;
341 | 	m_aes = NULL;
342 | 	memset(m_key, 0, 16);
343 | 	memset(m_iv, 0, 16);
344 | 	m_aes = new AES(m_key);
345 | 	assert(m_aes != NULL);
346 | }
347 | 
348 | AESModeOfOperation::~AESModeOfOperation() {
349 | 	delete m_aes;
350 | }
351 | 
352 | void AESModeOfOperation::set_mode(AESMode_t _mode) {
353 | 	m_mode = _mode;
354 | }
355 | 
356 | void AESModeOfOperation::set_key(unsigned char *_key) {
357 | 	assert(_key != NULL);
358 | 	memcpy(m_key, _key, 16);
359 | 	m_aes->SetKey(m_key);
360 | }
361 | void AESModeOfOperation::set_iv(unsigned char *_iv) {
362 | 	assert(_iv != NULL);
363 | 	memcpy(m_iv, _iv, 16);
364 | }
365 | 
366 | int AESModeOfOperation::Encrypt(unsigned char *_in, int _length, unsigned char *_out) {
367 | 	bool first_round = true;
368 | 	int rounds = 0;
369 | 	int start = 0;
370 | 	int end = 0;
371 | 	unsigned char input[16] = {0};
372 | 	unsigned char output[16] = {0};
373 | 	unsigned char ciphertext[16] = {0};
374 | 	unsigned char cipherout[256] = {0};
375 | 	unsigned char plaintext[16] = {0};
376 | 	int co_index = 0;
377 | 	// 1. get rounds
378 | 	if ( _length % 16 == 0) {
379 | 		rounds = _length / 16;
380 | 	} else {
381 | 		rounds = _length / 16 + 1;
382 | 	}
383 | 	// 2. for all rounds 
384 | 	for (int j = 0; j < rounds; ++j) {
385 | 		start = j*16;
386 | 		end = j*16 + 16;
387 | 		if (end > _length) end = _length;	// end of input
388 | 		// 3. copyt input to m_plaintext
389 | 		memset(plaintext, 0, 16);
390 | 		memcpy(plaintext, _in + start, end - start);
391 | 		// 4. handle all modes
392 | 		if (m_mode == MODE_CFB) {
393 | 			if (first_round == true) {
394 | 				m_aes->Cipher(m_iv, output);
395 | 				first_round = false;
396 | 			} else {
397 | 				m_aes->Cipher(input,output);
398 | 			}
399 | 			for (int i = 0; i < 16; ++i) {
400 | 				if ( (end - start) - 1 < i) {
401 | 					ciphertext[i] = 0 ^ output[i];
402 | 				} else {
403 | 					ciphertext[i] = plaintext[i] ^ output[i];
404 | 				}
405 | 			}
406 | 			for (int k = 0 ; k < end - start; ++k) {
407 | 				cipherout[co_index++] = ciphertext[k];
408 | 			}
409 | 			//memset(input,0, 16);
410 | 			memcpy(input,ciphertext, 16);
411 | 		} else if (m_mode == MODE_OFB) {			// MODE_OFB
412 | 			if (first_round == true) {
413 | 				m_aes->Cipher(m_iv,output); // 
414 | 				first_round = false;
415 | 			} else {
416 | 				m_aes->Cipher(input, output);
417 | 			}
418 | 			// ciphertext = plaintext ^ output
419 | 			for (int i = 0; i < 16; ++i) {
420 | 				if ( (end - start) - 1 < i) {
421 | 					ciphertext[i] = 0 ^ output[i];
422 | 				} else {
423 | 					ciphertext[i] = plaintext[i] ^ output[i];
424 | 				}
425 | 			}
426 | 			// 
427 | 			for (int k = 0; k < end - start; ++k) {
428 | 				cipherout[co_index++] = ciphertext[k];
429 | 			}
430 | 			//memset(input,0,16);
431 | 			memcpy(input, output, 16);
432 | 		} else if (m_mode == MODE_CBC) {			// MODE_CBC
433 | 			printf("-----plaintext------");
434 | 			print(plaintext, 16);
435 | 			printf("--------------------\n");
436 | //			printf("-----m_iv-----------\n");
437 | //			print (m_iv, 16);
438 | //			printf("--------------------\n");
439 | 			for (int i = 0; i < 16; ++i) {
440 | 				if (first_round == true) {
441 | 					input[i] = plaintext[i] ^ m_iv[i];
442 | 				} else {
443 | 					input[i] = plaintext[i] ^ ciphertext[i];
444 | 				}
445 | 			}
446 | 			first_round = false;
447 | //			printf("^^^^^^^^^^^^\n");
448 | //			print(input, 16);
449 | //			printf("^^^^^^^^^^^^\n");
450 | 			m_aes->Cipher(input, ciphertext);
451 | 			printf("****ciphertext****");
452 | 			print(ciphertext, 16);
453 | 			printf("************\n");
454 | 			for (int k = 0; k < end - start; ++k){
455 | 				cipherout[co_index++] = ciphertext[k];
456 | 			}
457 | 			//memcpy(cipherout, ciphertext, 16);
458 | 			//co_index = 16;
459 | 		} else if (m_mode == MODE_ECB) {
460 | 			// TODO: 
461 | 		}
462 | 	}
463 | 	memcpy(_out, cipherout, co_index);
464 | 	return co_index;
465 | }
466 | 
467 | int AESModeOfOperation::Decrypt(unsigned char *_in, int _length, unsigned char *_out) {
468 | 	// TODO :
469 | 	bool first_round = true;
470 | 	int rounds = 0;
471 | 	unsigned char ciphertext[16] = {0};
472 | 	unsigned char input[16] = {0};
473 | 	unsigned char output[16] = {0};
474 | 	unsigned char plaintext[16] = {0};
475 | 	unsigned char plainout[256] = {0};
476 | 	int po_index = 0 ;
477 | 	if (_length % 16 == 0) {
478 | 		rounds = _length / 16;
479 | 	} else {
480 | 		rounds = _length / 16 + 1;
481 | 	}
482 | 	
483 | 	int start = 0;
484 | 	int end = 0;
485 | 	
486 | 	for (int j = 0; j < rounds; j++) {
487 | 		start = j * 16;
488 | 		end   = start + 16;
489 | 		if ( end > _length) {
490 | 			end = _length;
491 | 		}
492 | 		memset(ciphertext, 0, 16);
493 | 		memcpy(ciphertext, _in + start, end - start);
494 | 		if ( m_mode == MODE_CFB ) {
495 | 			if (first_round == true) {
496 | 				m_aes->Cipher(m_iv, output);
497 | 				first_round = false;
498 | 			} else {
499 | 				m_aes->Cipher(input, output);
500 | 			}
501 | 			for (int i = 0; i < 16; i++) {
502 | 				if ( end - start - 1 < i) {
503 | 					plaintext[i] = output[i] ^ 0;
504 | 				} else {
505 | 					plaintext[i] = output[i] ^ ciphertext[i];
506 | 				}
507 | 			}
508 | 			for (int k = 0; k < end - start; ++k) {
509 | 				plainout[po_index++] = plaintext[k];
510 | 			}
511 | 			//memset(input, 0, 16);
512 | 			memcpy(input, ciphertext, 16);
513 | 		} else if (m_mode == MODE_OFB) {
514 | 			if (first_round == true) {
515 | 				m_aes->Cipher(m_iv, output);
516 | 				first_round = false;
517 | 			} else {
518 | 				m_aes->Cipher(input, output);
519 | 			}
520 | 			for (int i = 0; i < 16; i++) {
521 | 				if ( end - start -1 < i) {
522 | 					plaintext[i] = 0 ^ ciphertext[i];
523 | 					first_round = false;
524 | 				} else {
525 | 					plaintext[i] = output[i] ^ ciphertext[i];
526 | 				}
527 | 			}
528 | 			for (int k = 0; k < end - start; ++k) {
529 | 				plainout[po_index++] = plaintext[k];
530 | 			}
531 | 			memcpy(input, output, 16);
532 | 		} else if (m_mode == MODE_CBC) {
533 | 			printf("------ciphertext------");
534 | 			print(ciphertext, 16);
535 | 			printf("----------------------\n");
536 | 			m_aes->InvCipher(ciphertext, output);
537 | 			printf("------output------");
538 | 			print(output, 16);
539 | 			printf("----------------------\n");
540 | 			for (int i = 0; i < 16; ++i) {
541 | 				if ( first_round == true) {
542 | 					plaintext[i] =  m_iv[i] ^  output[i];
543 | 				} else {
544 | 					plaintext[i] = input[i] ^ output[i];
545 | 				}
546 | 			}
547 | 			first_round = false;
548 | 			for ( int k = 0; k < end - start; ++k) {
549 | 				plainout[po_index++] = plaintext[k];
550 | 			}
551 | 			memcpy(input, ciphertext, 16);
552 | 		} else {
553 | 			// TODO
554 | 		}
555 | 	}
556 |     memcpy(_out, plainout, po_index);
557 |     return po_index;
558 | }
559 | 
560 | 


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/AES.h:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * FileName : AES.h
 3 |  * 
 4 |  */
 5 | #ifndef __AES_H__
 6 | #define __AES_H__
 7 | 
 8 | #include <cstdio>
 9 | 
10 | extern void print(unsigned char* state, int len);
11 | 
12 | class AES  
13 | {
14 | public:
15 | 	AES(unsigned char* key = NULL);
16 | 	virtual ~AES();
17 | 	void SetKey(unsigned char *key);
18 | 	unsigned char* Cipher(unsigned char* input, unsigned char* output);
19 | 	unsigned char* InvCipher(unsigned char* input, unsigned char* output);
20 | 	void* Cipher(void* input, void *output, int length=0);
21 | 	void* InvCipher(void* input,void *output, int length);
22 | 
23 | private:
24 | 	unsigned char Sbox[256];
25 | 	unsigned char InvSbox[256];
26 | 	unsigned char w[11][4][4];
27 | 
28 | 	void KeyExpansion(unsigned char* key, unsigned char w[][4][4]);
29 | 	unsigned char FFmul(unsigned char a, unsigned char b);
30 | 
31 | 	void SubBytes(unsigned char state[][4]);
32 | 	void ShiftRows(unsigned char state[][4]);
33 | 	void MixColumns(unsigned char state[][4]);
34 | 	void AddRoundKey(unsigned char state[][4], unsigned char k[][4]);
35 | 
36 | 	void InvSubBytes(unsigned char state[][4]);
37 | 	void InvShiftRows(unsigned char state[][4]);
38 | 	void InvMixColumns(unsigned char state[][4]);
39 | };
40 | 
41 | enum AESMode_t { MODE_OFB = 1, MODE_CFB, MODE_CBC, MODE_ECB };
42 | class AESModeOfOperation {
43 | private:
44 | 	AES *m_aes;
45 | 	AESMode_t	  m_mode;
46 | 	unsigned char m_key[16];
47 | 	unsigned char m_iv[16];
48 | //	bool		  m_firstround;
49 | public:
50 | 	AESModeOfOperation();
51 | 	~AESModeOfOperation();
52 | 	void set_mode(AESMode_t _mode);
53 | 	//AESMode_t get_mode();
54 | 	void set_key (unsigned char *key);
55 | 	void set_iv(unsigned char *iv);
56 | 	int  Encrypt(unsigned char *input, int length, unsigned char *output);
57 | 	int  Decrypt(unsigned char *input, int length, unsigned char *output);
58 | };
59 | 
60 | 
61 | 
62 | #endif 
63 | 


--------------------------------------------------------------------------------
/README:
--------------------------------------------------------------------------------
1 | AESCipher
2 | 	support AES core, and CFB, OFB, CBC, ECB
3 | 


--------------------------------------------------------------------------------
/Test.cpp:
--------------------------------------------------------------------------------
 1 | #include <cstring>
 2 | #include "AES.h"
 3 | 
 4 | void print(unsigned char* state, int len);
 5 | 
 6 | int main(int argc, char* argv[])
 7 | {
 8 | 	unsigned char input[] = {84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 116, 101, 115, 116, 33, 84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 116, 101, 115, 116, 33, 84, 104, 105, 115, 32, 105, 115, 32, 97, 46};
 9 | 	unsigned char iv[]    = {103,35,148,239,76,213,47,118,255,222,123,176,106,134,98,92};
10 | 	unsigned char key[]   = {143,194,34,208,145,203,230,143,177,246,97,206,145,92,255,84};
11 | 	unsigned char output[100] ={0};
12 |     unsigned char temp[100] = {0};
13 | //	unsigned char 
14 | 	AESModeOfOperation moo;
15 | 	moo.set_key(key);
16 | 	moo.set_mode(MODE_OFB);
17 | 	moo.set_iv(iv);
18 |     int olen = sizeof input;
19 | 
20 |     memcpy(temp, input, sizeof input);
21 | 	int len = moo.Encrypt(temp, olen, output);
22 | 	printf("len = %d\n", len);
23 |     printf("output");
24 | 	print(output, len);
25 | 	printf("\n\nDecrypt----------\n");
26 | 	len = moo.Decrypt(output, len, input);
27 | 	printf("len = %d\n", len);
28 |     printf("input");
29 | 	print(input, len);
30 | 	
31 | 	return 0;
32 | }
33 | 
34 | void print(unsigned char* state, int len)
35 | {
36 | 	int i;
37 | 	for(i=0; i<len; i++)
38 | 	{
39 |         if ( i%16 == 0) printf("\n");
40 | //		printf("%s%X ",state[i]>15 ? "" : "0", state[i]);
41 |         printf("%d  ", (int)(state[i] & 0xff));
42 | 	}
43 | 	printf("\n");
44 | }
45 | 
46 | 


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