C++获取MD5算法实现代码_C/C++

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MD5.h

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									#ifndef MD5_H 

									#define MD5_H 

									#include <string> 

									#include <fstream> 

									/* Type define */

									typedef unsigned char byte;

									typedef unsigned int uint32;

									typedef unsigned int uint4;

									using std::string;

									using std::ifstream;

									/* MD5 declaration. */

									class MD5 {

									public:

									  MD5();

									  MD5(const void *input, size_t length);

									  MD5(const string &str);

									  MD5(ifstream &in);

									  void update(const void *input, size_t length);

									  void update(const string &str);

									  void update(ifstream &in);

									  const byte* digest();

									  string toString();

									  void reset();

									  inline uint4 rotate_left(uint4 x, int n);

									  inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);

									  inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);

									  inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);

									  inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);

									private:

									  void update(const byte *input, size_t length);

									  void final();

									  void transform(const byte block[64]);

									  void encode(const uint32 *input, byte *output, size_t length);

									  void decode(const byte *input, uint32 *output, size_t length);

									  string bytesToHexString(const byte *input, size_t length);

									  /* class uncopyable */

									  MD5(const MD5&);

									  MD5& operator=(const MD5&);

									private:

									  uint32 _state[4]; /* state (ABCD) */

									  uint32 _count[2]; /* number of bits, modulo 2^64 (low-order word first) */

									  byte _buffer[64]; /* input buffer */

									  byte _digest[16]; /* message digest */

									  bool _finished; /* calculate finished ? */

									  static const byte PADDING[64]; /* padding for calculate */

									  static const char HEX[16];

									  static const size_t BUFFER_SIZE = 1024;

									};

									string FileDigest(const string &file);

									#endif/*MD5_H*/

MD5.cpp

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									#include "md5.h" 

									using namespace std;

									/* Constants for MD5Transform routine. */

									#define S11 7 

									#define S12 12 

									#define S13 17 

									#define S14 22 

									#define S21 5 

									#define S22 9 

									#define S23 14 

									#define S24 20 

									#define S31 4 

									#define S32 11 

									#define S33 16 

									#define S34 23 

									#define S41 6 

									#define S42 10 

									#define S43 15 

									#define S44 21 

									/* F, G, H and I are basic MD5 functions.

									*/

									#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 

									#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 

									#define H(x, y, z) ((x) ^ (y) ^ (z)) 

									#define I(x, y, z) ((y) ^ ((x) | (~z))) 

									/* ROTATE_LEFT rotates x left n bits.

									*/

									#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 

									/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.

									Rotation is separate from addition to prevent recomputation.

									*/

									//#define FF(a, b, c, d, x, s, ac) { \ 

									//(a) += F((b), (c), (d)) + (x)+ac; \

									//(a) = ROTATE_LEFT((a), (s)); \

									//(a) += (b); \

									//}

									//#define GG(a, b, c, d, x, s, ac) { \ 

									//(a) += G((b), (c), (d)) + (x)+ac; \

									//(a) = ROTATE_LEFT((a), (s)); \

									//(a) += (b); \

									//}

									//#define HH(a, b, c, d, x, s, ac) { \ 

									//(a) += H((b), (c), (d)) + (x)+ac; \

									//(a) = ROTATE_LEFT((a), (s)); \

									//(a) += (b); \

									//}

									//#define II(a, b, c, d, x, s, ac) { \ 

									//(a) += I((b), (c), (d)) + (x)+ac; \

									//(a) = ROTATE_LEFT((a), (s)); \

									//(a) += (b); \

									//}

									inline uint4 MD5::rotate_left(uint4 x, int n) {

									  return (x << n) | (x >> (32 - n));

									}

									inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {

									  a = rotate_left(a + F(b, c, d) + x + ac, s) + b;

									}

									inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {

									  a = rotate_left(a + G(b, c, d) + x + ac, s) + b;

									}

									inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {

									  a = rotate_left(a + H(b, c, d) + x + ac, s) + b;

									}

									inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {

									  a = rotate_left(a + I(b, c, d) + x + ac, s) + b;

									}

									const byte MD5::PADDING[64] = { 0x80 };

									const char MD5::HEX[16] = {

									  '0', '1', '2', '3',

									  '4', '5', '6', '7',

									  '8', '9', 'a', 'b',

									  'c', 'd', 'e', 'f'

									};

									/* Default construct. */

									MD5::MD5() {

									  reset();

									}

									/* Construct a MD5 object with a input buffer. */

									MD5::MD5(const void *input, size_t length) {

									  reset();

									  update(input, length);

									}

									/* Construct a MD5 object with a string. */

									MD5::MD5(const string &str) {

									  reset();

									  update(str);

									}

									/* Construct a MD5 object with a file. */

									MD5::MD5(ifstream &in) {

									  reset();

									  update(in);

									}

									/* Return the message-digest */

									const byte* MD5::digest() {

									  if (!_finished) {

									    _finished = true;

									    final();

									  }

									  return _digest;

									}

									/* Reset the calculate state */

									void MD5::reset() {

									  _finished = false;

									  /* reset number of bits. */

									  _count[0] = _count[1] = 0;

									  /* Load magic initialization constants. */

									  _state[0] = 0x67452301;

									  _state[1] = 0xefcdab89;

									  _state[2] = 0x98badcfe;

									  _state[3] = 0x10325476;

									}

									/* Updating the context with a input buffer. */

									void MD5::update(const void *input, size_t length) {

									  update((const byte*)input, length);

									}

									/* Updating the context with a string. */

									void MD5::update(const string &str) {

									  update((const byte*)str.c_str(), str.length());

									}

									/* Updating the context with a file. */

									void MD5::update(ifstream &in) {

									  if (!in)

									    return;

									  std::streamsize length;

									  char buffer[BUFFER_SIZE];

									  while (!in.eof()) {

									    in.read(buffer, BUFFER_SIZE);

									    length = in.gcount();

									    if (length > 0)

									      update(buffer, length);

									  }

									  in.close();

									}

									/* MD5 block update operation. Continues an MD5 message-digest

									operation, processing another message block, and updating the

									context.

									*/

									void MD5::update(const byte *input, size_t length) {

									  uint32 i, index, partLen;

									  _finished = false;

									  /* Compute number of bytes mod 64 */

									  index = (uint32)((_count[0] >> 3) & 0x3f);

									  /* update number of bits */

									  if ((_count[0] += ((uint32)length << 3)) < ((uint32)length << 3))

									    _count[1]++;

									  _count[1] += ((uint32)length >> 29);

									  partLen = 64 - index;

									  /* transform as many times as possible. */

									  if (length >= partLen) {

									    memcpy(&_buffer[index], input, partLen);

									    transform(_buffer);

									    for (i = partLen; i + 63 < length; i += 64)

									      transform(&input[i]);

									    index = 0;

									  }

									  else {

									    i = 0;

									  }

									  /* Buffer remaining input */

									  memcpy(&_buffer[index], &input[i], length - i);

									}

									/* MD5 finalization. Ends an MD5 message-_digest operation, writing the

									the message _digest and zeroizing the context.

									*/

									void MD5::final() {

									  byte bits[8];

									  uint32 oldState[4];

									  uint32 oldCount[2];

									  uint32 index, padLen;

									  /* Save current state and count. */

									  memcpy(oldState, _state, 16);

									  memcpy(oldCount, _count, 8);

									  /* Save number of bits */

									  encode(_count, bits, 8);

									  /* Pad out to 56 mod 64. */

									  index = (uint32)((_count[0] >> 3) & 0x3f);

									  padLen = (index < 56) ? (56 - index) : (120 - index);

									  update(PADDING, padLen);

									  /* Append length (before padding) */

									  update(bits, 8);

									  /* Store state in digest */

									  encode(_state, _digest, 16);

									  /* Restore current state and count. */

									  memcpy(_state, oldState, 16);

									  memcpy(_count, oldCount, 8);

									}

									/* MD5 basic transformation. Transforms _state based on block. */

									void MD5::transform(const byte block[64]) {

									  uint32 a = _state[0], b = _state[1], c = _state[2], d = _state[3], x[16];

									  decode(block, x, 64);

									  /* Round 1 */

									  FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */

									  FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */

									  FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */

									  FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */

									  FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */

									  FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */

									  FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */

									  FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */

									  FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */

									  FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */

									  FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */

									  FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */

									  FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */

									  FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */

									  FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */

									  FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

									                      /* Round 2 */

									  GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */

									  GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */

									  GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */

									  GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */

									  GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */

									  GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */

									  GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */

									  GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */

									  GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */

									  GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */

									  GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */

									  GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */

									  GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */

									  GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */

									  GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */

									  GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

									                      /* Round 3 */

									  HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */

									  HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */

									  HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */

									  HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */

									  HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */

									  HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */

									  HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */

									  HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */

									  HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */

									  HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */

									  HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */

									  HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */

									  HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */

									  HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */

									  HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */

									  HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */

									                      /* Round 4 */

									  II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */

									  II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */

									  II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */

									  II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */

									  II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */

									  II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */

									  II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */

									  II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */

									  II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */

									  II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */

									  II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */

									  II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */

									  II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */

									  II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */

									  II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */

									  II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */

									  _state[0] += a;

									  _state[1] += b;

									  _state[2] += c;

									  _state[3] += d;

									}

									/* Encodes input (ulong) into output (byte). Assumes length is

									a multiple of 4.

									*/

									void MD5::encode(const uint32 *input, byte *output, size_t length) {

									  for (size_t i = 0, j = 0; j<length; i++, j += 4) {

									    output[j] = (byte)(input[i] & 0xff);

									    output[j + 1] = (byte)((input[i] >> 8) & 0xff);

									    output[j + 2] = (byte)((input[i] >> 16) & 0xff);

									    output[j + 3] = (byte)((input[i] >> 24) & 0xff);

									  }

									}

									/* Decodes input (byte) into output (ulong). Assumes length is

									a multiple of 4.

									*/

									void MD5::decode(const byte *input, uint32 *output, size_t length) {

									  for (size_t i = 0, j = 0; j<length; i++, j += 4) {

									    output[i] = ((uint32)input[j]) | (((uint32)input[j + 1]) << 8) |

									      (((uint32)input[j + 2]) << 16) | (((uint32)input[j + 3]) << 24);

									  }

									}

									/* Convert byte array to hex string. */

									string MD5::bytesToHexString(const byte *input, size_t length) {

									  string str;

									  str.reserve(length << 1);

									  for (size_t i = 0; i < length; i++) {

									    int t = input[i];

									    int a = t / 16;

									    int b = t % 16;

									    str.append(1, HEX[a]);

									    str.append(1, HEX[b]);

									  }

									  return str;

									}

									/* Convert digest to string value */

									string MD5::toString() {

									  return bytesToHexString(digest(), 16);

									}

									//得到二进制文件的MD5码

									string FileDigest(const string &file) {

									  ifstream in(file.c_str(), ios::binary);

									  if (!in)

									    return "";

									  MD5 md5;

									  md5.reset();

									  std::streamsize length;

									  char buffer[1024];

									  while (!in.eof()) {

									    in.read(buffer, 1024);

									    length = in.gcount();

									    if (length > 0)

									      md5.update(buffer, length);

									  }

									  in.close();

									  return md5.toString();

									}

调用main.cpp

				?

									// Md5Test.cpp : 定义控制台应用程序的入口点。

									//

									#include "stdafx.h"

									#include "MD5.h"

									#include <fstream>

									#include <process.h>

									int main()

									{

									  std::ifstream of("ReadMe.txt", std::ios::in | std::ios::binary);

									  if (!of.is_open())return 0;

									  MD5 fileMd5(of);

									  printf("%s\r\n", fileMd5.toString().c_str());

									  MD5 strMd5("123456789");

									  printf("%s\r\n", strMd5.toString().c_str());

									  system("pause");

									  return 0;

									}