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Linux教程網 >> Linux編程 >> Linux編程 >> MD5的C++源碼

MD5的C++源碼

日期：2017/3/1 10:46:32   编辑：Linux編程

關於MD5的C源碼，請參考另外一篇文章:MD5的C源碼 http://www.linuxidc.com/Linux/2011-12/49783.htm

md5.h:

  1. #ifndef MD5_H
  2. #define MD5_H
  4. #include <string>
  5. #include <fstream>
  7. /* Type define */
  8. typedef unsigned char byte;
  9. typedef unsigned int uint32;
  11. using std::string;
  12. using std::ifstream;
  14. /* MD5 declaration. */
  15. class MD5 {
  16. public:
  17. MD5();
  18. MD5(const void *input, size_t length);
  19. MD5(const string &str);
  20. MD5(ifstream &in);
  21. void update(const void *input, size_t length);
  22. void update(const string &str);
  23. void update(ifstream &in);
  24. const byte* digest();
  25. string toString();
  26. void reset();
  27. private:
  28. void update(const byte *input, size_t length);
  29. void final();
  30. void transform(const byte block[64]);
  31. void encode(const uint32 *input, byte *output, size_t length);
  32. void decode(const byte *input, uint32 *output, size_t length);
  33. string bytesToHexString(const byte *input, size_t length);
  35. /* class uncopyable */
  36. MD5(const MD5&);
  37. MD5& operator=(const MD5&);
  38. private:
  39. uint32 _state[4]; /* state (ABCD) */
  40. uint32 _count[2]; /* number of bits, modulo 2^64 (low-order word first) */
  41. byte _buffer[64]; /* input buffer */
  42. byte _digest[16]; /* message digest */
  43. bool _finished; /* calculate finished ? */
  45. static const byte PADDING[64]; /* padding for calculate */
  46. static const char HEX[16];
  47. static const size_t BUFFER_SIZE = 1024;
  48. };
  50. #endif/*MD5_H*/
md5.cpp:
  1. #include "md5.h"
  3. using namespace std;
  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
  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)))
  31. /* ROTATE_LEFT rotates x left n bits.
  32. */
  33. #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  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. }
  60. const byte MD5::PADDING[64] = { 0x80 };
  61. const char MD5::HEX[16] = {
  62. '0', '1', '2', '3',
  63. '4', '5', '6', '7',
  64. '8', '9', 'a', 'b',
  65. 'c', 'd', 'e', 'f'
  66. };
  68. /* Default construct. */
  69. MD5::MD5() {
  70. reset();
  71. }
  73. /* Construct a MD5 object with a input buffer. */
  74. MD5::MD5(const void *input, size_t length) {
  75. reset();
  76. update(input, length);
  77. }
  79. /* Construct a MD5 object with a string. */
  80. MD5::MD5(const string &str) {
  81. reset();
  82. update(str);
  83. }
  85. /* Construct a MD5 object with a file. */
  86. MD5::MD5(ifstream &in) {
  87. reset();
  88. update(in);
  89. }
  91. /* Return the message-digest */
  92. const byte* MD5::digest() {
  93. if (!_finished) {
  94. _finished = true;
  95. final();
  96. }
  97. return _digest;
  98. }
  100. /* Reset the calculate state */
  101. void MD5::reset() {
  103. _finished = false;
  104. /* reset number of bits. */
  105. _count[0] = _count[1] = 0;
  106. /* Load magic initialization constants. */
  107. _state[0] = 0x67452301;
  108. _state[1] = 0xefcdab89;
  109. _state[2] = 0x98badcfe;
  110. _state[3] = 0x10325476;
  111. }
  113. /* Updating the context with a input buffer. */
  114. void MD5::update(const void *input, size_t length) {
  115. update((const byte*)input, length);
  116. }
  118. /* Updating the context with a string. */
  119. void MD5::update(const string &str) {
  120. update((const byte*)str.c_str(), str.length());
  121. }
  123. /* Updating the context with a file. */
  124. void MD5::update(ifstream &in) {
  126. if (!in)
  127. return;
  129. std::streamsize length;
  130. char buffer[BUFFER_SIZE];
  131. while (!in.eof()) {
  132. in.read(buffer, BUFFER_SIZE);
  133. length = in.gcount();
  134. if (length > 0)
  135. update(buffer, length);
  136. }
  137. in.close();
  138. }
  140. /* MD5 block update operation. Continues an MD5 message-digest
  141. operation, processing another message block, and updating the
  142. context.
  143. */
  144. void MD5::update(const byte *input, size_t length) {
  146. uint32 i, index, partLen;
  148. _finished = false;
  150. /* Compute number of bytes mod 64 */
  151. index = (uint32)((_count[0] >> 3) & 0x3f);
  153. /* update number of bits */
  154. if((_count[0] += ((uint32)length << 3)) < ((uint32)length << 3))
  155. _count[1]++;
  156. _count[1] += ((uint32)length >> 29);
  158. partLen = 64 - index;
  160. /* transform as many times as possible. */
  161. if(length >= partLen) {
  163. memcpy(&_buffer[index], input, partLen);
  164. transform(_buffer);
  166. for (i = partLen; i + 63 < length; i += 64)
  167. transform(&input[i]);
  168. index = 0;
  170. } else {
  171. i = 0;
  172. }
  174. /* Buffer remaining input */
  175. memcpy(&_buffer[index], &input[i], length-i);
  176. }
  178. /* MD5 finalization. Ends an MD5 message-_digest operation, writing the
  179. the message _digest and zeroizing the context.
  180. */
  181. void MD5::final() {
  183. byte bits[8];
  184. uint32 oldState[4];
  185. uint32 oldCount[2];
  186. uint32 index, padLen;
  188. /* Save current state and count. */
  189. memcpy(oldState, _state, 16);
  190. memcpy(oldCount, _count, 8);
  192. /* Save number of bits */
  193. encode(_count, bits, 8);
  195. /* Pad out to 56 mod 64. */
  196. index = (uint32)((_count[0] >> 3) & 0x3f);
  197. padLen = (index < 56) ? (56 - index) : (120 - index);
  198. update(PADDING, padLen);
  200. /* Append length (before padding) */
  201. update(bits, 8);
  203. /* Store state in digest */
  204. encode(_state, _digest, 16);
  206. /* Restore current state and count. */
  207. memcpy(_state, oldState, 16);
  208. memcpy(_count, oldCount, 8);
  209. }
  211. /* MD5 basic transformation. Transforms _state based on block. */
  212. void MD5::transform(const byte block[64]) {
  214. uint32 a = _state[0], b = _state[1], c = _state[2], d = _state[3], x[16];
  216. decode(block, x, 64);
  218. /* Round 1 */
  219. FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  220. FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  221. FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  222. FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  223. FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  224. FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  225. FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  226. FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  227. FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  228. FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  229. FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  230. FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  231. FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  232. FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  233. FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  234. FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
  236. /* Round 2 */
  237. GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  238. GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  239. GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  240. GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  241. GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  242. GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
  243. GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  244. GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  245. GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  246. GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  247. GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
  248. GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  249. GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  250. GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  251. GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  252. GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
  254. /* Round 3 */
  255. HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  256. HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  257. HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  258. HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  259. HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  260. HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  261. HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  262. HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  263. HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  264. HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  265. HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  266. HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
  267. HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  268. HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  269. HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  270. HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
  272. /* Round 4 */
  273. II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  274. II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  275. II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  276. II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  277. II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  278. II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  279. II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  280. II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  281. II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  282. II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  283. II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  284. II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  285. II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  286. II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  287. II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  288. II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
  290. _state[0] += a;
  291. _state[1] += b;
  292. _state[2] += c;
  293. _state[3] += d;
  294. }
  296. /* Encodes input (ulong) into output (byte). Assumes length is
  297. a multiple of 4.
  298. */
  299. void MD5::encode(const uint32 *input, byte *output, size_t length) {
  301. for(size_t i=0, j=0; j<length; i++, j+=4) {
  302. output[j]= (byte)(input[i] & 0xff);
  303. output[j+1] = (byte)((input[i] >> 8) & 0xff);
  304. output[j+2] = (byte)((input[i] >> 16) & 0xff);
  305. output[j+3] = (byte)((input[i] >> 24) & 0xff);
  306. }
  307. }
  309. /* Decodes input (byte) into output (ulong). Assumes length is
  310. a multiple of 4.
  311. */
  312. void MD5::decode(const byte *input, uint32 *output, size_t length) {
  314. for(size_t i=0, j=0; j<length; i++, j+=4) {
  315. output[i] = ((uint32)input[j]) | (((uint32)input[j+1]) << 8) |
  316. (((uint32)input[j+2]) << 16) | (((uint32)input[j+3]) << 24);
  317. }
  318. }
  320. /* Convert byte array to hex string. */
  321. string MD5::bytesToHexString(const byte *input, size_t length) {
  322. string str;
  323. str.reserve(length << 1);
  324. for(size_t i = 0; i < length; i++) {
  325. int t = input[i];
  326. int a = t / 16;
  327. int b = t % 16;
  328. str.append(1, HEX[a]);
  329. str.append(1, HEX[b]);
  330. }
  331. return str;
  332. }
  334. /* Convert digest to string value */
  335. string MD5::toString() {
  336. return bytesToHexString(digest(), 16);
  337. }

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