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C++ MD5 算法
jangogo @ 2009-5-16 10:40:00
[算法代码来自网上,不好意思忘记了是那个作者的了]
头文件 MD5.h
- #ifndef MD5_H
- #define MD5_H
-
- #include <string>
- #include <fstream>
-
-
- typedef unsigned char byte;
- typedef unsigned int uint32_;
-
- using std::string;
- using std::ifstream;
-
-
- 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();
-
- 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);
-
-
- MD5(const MD5&);
- MD5& operator=(const MD5&);
-
- private:
- uint32_ _state[4];
- uint32_ _count[2];
- byte _buffer[64];
- byte _digest[16];
- bool _finished;
-
- static const byte PADDING[64];
- static const char HEX[16];
- enum { BUFFER_SIZE = 1024 };
- };
-
- #endif /*MD5_H*/
MD5.cpp
- #include "md5.h"
-
- using namespace std;
-
-
- #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
-
-
-
-
- #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)))
-
-
-
- #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
-
-
-
-
- #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); \
- }
-
-
- 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'
- };
-
-
-
- MD5::MD5() {
- reset();
- }
-
-
- MD5::MD5(const void* input, size_t length) {
- reset();
- update(input, length);
- }
-
-
- MD5::MD5(const string& str) {
- reset();
- update(str);
- }
-
-
- MD5::MD5(ifstream& in) {
- reset();
- update(in);
- }
-
-
- const byte* MD5::digest() {
-
- if (!_finished) {
- _finished = true;
- final();
- }
- return _digest;
- }
-
-
- void MD5::reset() {
-
- _finished = false;
-
- _count[0] = _count[1] = 0;
-
- _state[0] = 0x67452301;
- _state[1] = 0xefcdab89;
- _state[2] = 0x98badcfe;
- _state[3] = 0x10325476;
- }
-
-
- void MD5::update(const void* input, size_t length) {
- update((const byte*)input, length);
- }
-
-
- void MD5::update(const string& str) {
- update((const byte*)str.c_str(), str.length());
- }
-
-
- 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();
- }
-
-
-
-
-
- void MD5::update(const byte* input, size_t length) {
-
- uint32_ i, index, partLen;
-
- _finished = false;
-
-
- index = (uint32_)((_count[0] >> 3) & 0x3f);
-
-
- if ((_count[0] += ((uint32_)length << 3)) < ((uint32_)length << 3)) {
- ++_count[1];
- }
- _count[1] += ((uint32_)length >> 29);
-
- partLen = 64 - index;
-
-
- 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;
- }
-
-
- memcpy(&_buffer[index], &input[i], length - i);
- }
-
-
-
-
- void MD5::final() {
-
- byte bits[8];
- uint32_ oldState[4];
- uint32_ oldCount[2];
- uint32_ index, padLen;
-
-
- memcpy(oldState, _state, 16);
- memcpy(oldCount, _count, 8);
-
-
- encode(_count, bits, 8);
-
-
- index = (uint32_)((_count[0] >> 3) & 0x3f);
- padLen = (index < 56) ? (56 - index) : (120 - index);
- update(PADDING, padLen);
-
-
- update(bits, 8);
-
-
- encode(_state, _digest, 16);
-
-
- memcpy(_state, oldState, 16);
- memcpy(_count, oldCount, 8);
- }
-
-
- 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);
-
-
- FF (a, b, c, d, x[ 0], S11, 0xd76aa478);
- FF (d, a, b, c, x[ 1], S12, 0xe8c7b756);
- FF (c, d, a, b, x[ 2], S13, 0x242070db);
- FF (b, c, d, a, x[ 3], S14, 0xc1bdceee);
- FF (a, b, c, d, x[ 4], S11, 0xf57c0faf);
- FF (d, a, b, c, x[ 5], S12, 0x4787c62a);
- FF (c, d, a, b, x[ 6], S13, 0xa8304613);
- FF (b, c, d, a, x[ 7], S14, 0xfd469501);
- FF (a, b, c, d, x[ 8], S11, 0x698098d8);
- FF (d, a, b, c, x[ 9], S12, 0x8b44f7af);
- FF (c, d, a, b, x[10], S13, 0xffff5bb1);
- FF (b, c, d, a, x[11], S14, 0x895cd7be);
- FF (a, b, c, d, x[12], S11, 0x6b901122);
- FF (d, a, b, c, x[13], S12, 0xfd987193);
- FF (c, d, a, b, x[14], S13, 0xa679438e);
- FF (b, c, d, a, x[15], S14, 0x49b40821);
-
-
- GG (a, b, c, d, x[ 1], S21, 0xf61e2562);
- GG (d, a, b, c, x[ 6], S22, 0xc040b340);
- GG (c, d, a, b, x[11], S23, 0x265e5a51);
- GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa);
- GG (a, b, c, d, x[ 5], S21, 0xd62f105d);
- GG (d, a, b, c, x[10], S22, 0x2441453);
- GG (c, d, a, b, x[15], S23, 0xd8a1e681);
- GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8);
- GG (a, b, c, d, x[ 9], S21, 0x21e1cde6);
- GG (d, a, b, c, x[14], S22, 0xc33707d6);
- GG (c, d, a, b, x[ 3], S23, 0xf4d50d87);
- GG (b, c, d, a, x[ 8], S24, 0x455a14ed);
- GG (a, b, c, d, x[13], S21, 0xa9e3e905);
- GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8);
- GG (c, d, a, b, x[ 7], S23, 0x676f02d9);
- GG (b, c, d, a, x[12], S24, 0x8d2a4c8a);
-
-
- HH (a, b, c, d, x[ 5], S31, 0xfffa3942);
- HH (d, a, b, c, x[ 8], S32, 0x8771f681);
- HH (c, d, a, b, x[11], S33, 0x6d9d6122);
- HH (b, c, d, a, x[14], S34, 0xfde5380c);
- HH (a, b, c, d, x[ 1], S31, 0xa4beea44);
- HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9);
- HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60);
- HH (b, c, d, a, x[10], S34, 0xbebfbc70);
- HH (a, b, c, d, x[13], S31, 0x289b7ec6);
- HH (d, a, b, c, x[ 0], S32, 0xeaa127fa);
- HH (c, d, a, b, x[ 3], S33, 0xd4ef3085);
- HH (b, c, d, a, x[ 6], S34, 0x4881d05);
- HH (a, b, c, d, x[ 9], S31, 0xd9d4d039);
- HH (d, a, b, c, x[12], S32, 0xe6db99e5);
- HH (c, d, a, b, x[15], S33, 0x1fa27cf8);
- HH (b, c, d, a, x[ 2], S34, 0xc4ac5665);
-
-
- II (a, b, c, d, x[ 0], S41, 0xf4292244);
- II (d, a, b, c, x[ 7], S42, 0x432aff97);
- II (c, d, a, b, x[14], S43, 0xab9423a7);
- II (b, c, d, a, x[ 5], S44, 0xfc93a039);
- II (a, b, c, d, x[12], S41, 0x655b59c3);
- II (d, a, b, c, x[ 3], S42, 0x8f0ccc92);
- II (c, d, a, b, x[10], S43, 0xffeff47d);
- II (b, c, d, a, x[ 1], S44, 0x85845dd1);
- II (a, b, c, d, x[ 8], S41, 0x6fa87e4f);
- II (d, a, b, c, x[15], S42, 0xfe2ce6e0);
- II (c, d, a, b, x[ 6], S43, 0xa3014314);
- II (b, c, d, a, x[13], S44, 0x4e0811a1);
- II (a, b, c, d, x[ 4], S41, 0xf7537e82);
- II (d, a, b, c, x[11], S42, 0xbd3af235);
- II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb);
- II (b, c, d, a, x[ 9], S44, 0xeb86d391);
-
- _state[0] += a;
- _state[1] += b;
- _state[2] += c;
- _state[3] += d;
- }
-
-
-
-
- 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);
- }
- }
-
-
-
-
- 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);
- }
- }
-
-
- 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;
- }
-
-
- string MD5::toString() {
- return bytesToHexString(digest(), 16);
- }
Howto Use
-
-
- MD5 md5;
- md5.update("abc");
- const int len=(INT)strlen(md5.toString().c_str())*2;
- char *mv=new char[len];
- strcpy(mv,md5.toString().c_str());
- TCHAR *sz=new TCHAR[len];
- MultiByteToWideChar(CP_UTF8, 0, strupr(mv),-1, sz, len);
- delete []mv;
- MessageBox(NULL,(LPCWSTR)sz,L"Java Script",MB_OK);
- delete []sz;
-
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