MD5.h
1 #ifndef MD5_H
2 #define MD5_H
3
4 #include
5 #include
6
7 /* Type define */
8 typedef unsigned char byte;
9 typedef unsigned int uint32;
10 typedef unsigned int uint4;
11
12 using std::string;
13 using std::ifstream;
14
15 /* MD5 declaration. */
16 class MD5 {
17 public:
18 MD5();
19 MD5(const void *input, size_t length);
20 MD5(const string &str);
21 MD5(ifstream &in);
22 void update(const void *input, size_t length);
23 void update(const string &str);
24 void update(ifstream &in);
25 const byte* digest();
26 string toString();
27 void reset();
28
29 inline uint4 rotate_left(uint4 x, int n);
30 inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
31 inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
32 inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
33 inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
34
35 private:
36 void update(const byte *input, size_t length);
37 void final();
38 void transform(const byte block[64]);
39 void encode(const uint32 *input, byte *output, size_t length);
40 void decode(const byte *input, uint32 *output, size_t length);
41 string bytesToHexString(const byte *input, size_t length);
42
43 /* class uncopyable */
44 MD5(const MD5&);
45 MD5& operator=(const MD5&);
46 private:
47 uint32 _state[4]; /* state (ABCD) */
48 uint32 _count[2]; /* number of bits, modulo 2^64 (low-order word first) */
49 byte _buffer[64]; /* input buffer */
50 byte _digest[16]; /* message digest */
51 bool _finished; /* calculate finished ? */
52
53 static const byte PADDING[64]; /* padding for calculate */
54 static const char HEX[16];
55 static const size_t BUFFER_SIZE = 1024;
56 };
57
58 string FileDigest(const string &file);
59
60 #endif/*MD5_H*/
MD5.cpp
1 #include "md5.h"
2
3 using namespace std;
4
5 /* Constants for MD5Transform routine. */
6 #define S11 7
7 #define S12 12
8 #define S13 17
9 #define S14 22
10 #define S21 5
11 #define S22 9
12 #define S23 14
13 #define S24 20
14 #define S31 4
15 #define S32 11
16 #define S33 16
17 #define S34 23
18 #define S41 6
19 #define S42 10
20 #define S43 15
21 #define S44 21
22
23
24 /* F, G, H and I are basic MD5 functions.
25 */
26 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
27 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
28 #define H(x, y, z) ((x) ^ (y) ^ (z))
29 #define I(x, y, z) ((y) ^ ((x) | (~z)))
30
31 /* ROTATE_LEFT rotates x left n bits.
32 */
33 #define ROTATE_LEFT(x, n) (((x) > (32-(n))))
34
35 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
36 Rotation is separate from addition to prevent recomputation.
37 */
38 //#define FF(a, b, c, d, x, s, ac) { \
39 //(a) += F((b), (c), (d)) + (x)+ac; \
40 //(a) = ROTATE_LEFT((a), (s)); \
41 //(a) += (b); \
42 //}
43 //#define GG(a, b, c, d, x, s, ac) { \
44 //(a) += G((b), (c), (d)) + (x)+ac; \
45 //(a) = ROTATE_LEFT((a), (s)); \
46 //(a) += (b); \
47 //}
48 //#define HH(a, b, c, d, x, s, ac) { \
49 //(a) += H((b), (c), (d)) + (x)+ac; \
50 //(a) = ROTATE_LEFT((a), (s)); \
51 //(a) += (b); \
52 //}
53 //#define II(a, b, c, d, x, s, ac) { \
54 //(a) += I((b), (c), (d)) + (x)+ac; \
55 //(a) = ROTATE_LEFT((a), (s)); \
56 //(a) += (b); \
57 //}
58
59 inline uint4 MD5::rotate_left(uint4 x, int n) {
60 return (x > (32 - n));
61 }
62
63 inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
64 a = rotate_left(a + F(b, c, d) + x + ac, s) + b;
65 }
66
67 inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
68 a = rotate_left(a + G(b, c, d) + x + ac, s) + b;
69 }
70
71 inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
72 a = rotate_left(a + H(b, c, d) + x + ac, s) + b;
73 }
74
75 inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
76 a = rotate_left(a + I(b, c, d) + x + ac, s) + b;
77 }
78
79 const byte MD5::PADDING[64] = { 0x80 };
80 const char MD5::HEX[16] = {
81 '0', '1', '2', '3',
82 '4', '5', '6', '7',
83 '8', '9', 'a', 'b',
84 'c', 'd', 'e', 'f'
85 };
86
87 /* Default construct. */
88 MD5::MD5() {
89 reset();
90 }
91
92 /* Construct a MD5 object with a input buffer. */
93 MD5::MD5(const void *input, size_t length) {
94 reset();
95 update(input, length);
96 }
97
98 /* Construct a MD5 object with a string. */
99 MD5::MD5(const string &str) {
100 reset();
101 update(str);
102 }
103
104 /* Construct a MD5 object with a file. */
105 MD5::MD5(ifstream &in) {
106 reset();
107 update(in);
108 }
109
110 /* Return the message-digest */
111 const byte* MD5::digest() {
112 if (!_finished) {
113 _finished = true;
114 final();
115 }
116 return _digest;
117 }
118
119 /* Reset the calculate state */
120 void MD5::reset() {
121
122 _finished = false;
123 /* reset number of bits. */
124 _count[0] = _count[1] = 0;
125 /* Load magic initialization constants. */
126 _state[0] = 0x67452301;
127 _state[1] = 0xefcdab89;
128 _state[2] = 0x98badcfe;
129 _state[3] = 0x10325476;
130 }
131
132 /* Updating the context with a input buffer. */
133 void MD5::update(const void *input, size_t length) {
134 update((const byte*)input, length);
135 }
136
137 /* Updating the context with a string. */
138 void MD5::update(const string &str) {
139 update((const byte*)str.c_str(), str.length());
140 }
141
142 /* Updating the context with a file. */
143 void MD5::update(ifstream &in) {
144
145 if (!in)
146 return;
147
148 std::streamsize length;
149 char buffer[BUFFER_SIZE];
150 while (!in.eof()) {
151 in.read(buffer, BUFFER_SIZE);
152 length = in.gcount();
153 if (length > 0)
154 update(buffer, length);
155 }
156 in.close();
157 }
158
159 /* MD5 block update operation. Continues an MD5 message-digest
160 operation, processing another message block, and updating the
161 context.
162 */
163 void MD5::update(const byte *input, size_t length) {
164
165 uint32 i, index, partLen;
166
167 _finished = false;
168
169 /* Compute number of bytes mod 64 */
170 index = (uint32)((_count[0] >> 3) & 0x3f);
171
172 /* update number of bits */
173 if ((_count[0] += ((uint32)length 29);
176
177 partLen = 64 - index;
178
179 /* transform as many times as possible. */
180 if (length >= partLen) {
181
182 memcpy(&_buffer[index], input, partLen);
183 transform(_buffer);
184
185 for (i = partLen; i + 63 < length; i += 64)
186 transform(&input[i]);
187 index = 0;
188
189 }
190 else {
191 i = 0;
192 }
193
194 /* Buffer remaining input */
195 memcpy(&_buffer[index], &input[i], length - i);
196 }
197
198 /* MD5 finalization. Ends an MD5 message-_digest operation, writing the
199 the message _digest and zeroizing the context.
200 */
201 void MD5::final() {
202
203 byte bits[8];
204 uint32 oldState[4];
205 uint32 oldCount[2];
206 uint32 index, padLen;
207
208 /* Save current state and count. */
209 memcpy(oldState, _state, 16);
210 memcpy(oldCount, _count, 8);
211
212 /* Save number of bits */
213 encode(_count, bits, 8);
214
215 /* Pad out to 56 mod 64. */
216 index = (uint32)((_count[0] >> 3) & 0x3f);
217 padLen = (index < 56) ? (56 - index) : (120 - index);
218 update(PADDING, padLen);
219
220 /* Append length (before padding) */
221 update(bits, 8);
222
223 /* Store state in digest */
224 encode(_state, _digest, 16);
225
226 /* Restore current state and count. */
227 memcpy(_state, oldState, 16);
228 memcpy(_count, oldCount, 8);
229 }
230
231 /* MD5 basic transformation. Transforms _state based on block. */
232 void MD5::transform(const byte block[64]) {
233
234 uint32 a = _state[0], b = _state[1], c = _state[2], d = _state[3], x[16];
235
236 decode(block, x, 64);
237
238 /* Round 1 */
239 FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
240 FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
241 FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */
242 FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
243 FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
244 FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
245 FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
246 FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
247 FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
248 FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
249 FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
250 FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
251 FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
252 FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
253 FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
254 FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
255
256 /* Round 2 */
257 GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
258 GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
259 GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
260 GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
261 GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
262 GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
263 GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
264 GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
265 GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
266 GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
267 GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
268 GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
269 GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
270 GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
271 GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
272 GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
273
274 /* Round 3 */
275 HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
276 HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
277 HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
278 HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
279 HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
280 HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
281 HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
282 HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
283 HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
284 HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
285 HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
286 HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
287 HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
288 HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
289 HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
290 HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
291
292 /* Round 4 */
293 II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
294 II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
295 II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
296 II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
297 II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
298 II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
299 II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
300 II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
301 II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
302 II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
303 II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
304 II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
305 II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
306 II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
307 II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
308 II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
309
310 _state[0] += a;
311 _state[1] += b;
312 _state[2] += c;
313 _state[3] += d;
314 }
315
316 /* Encodes input (ulong) into output (byte). Assumes length is
317 a multiple of 4.
318 */
319 void MD5::encode(const uint32 *input, byte *output, size_t length) {
320
321 for (size_t i = 0, j = 0; j> 8) & 0xff);
324 output[j + 2] = (byte)((input[i] >> 16) & 0xff);
325 output[j + 3] = (byte)((input[i] >> 24) & 0xff);
326 }
327 }
328
329 /* Decodes input (byte) into output (ulong). Assumes length is
330 a multiple of 4.
331 */
332 void MD5::decode(const byte *input, uint32 *output, size_t length) {
333
334 for (size_t i = 0, j = 0; j
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