MD5 C++源码 亲测可运行

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源代码:
MD5.h

#pragma once
#include <stdlib.h>
#include <string>
#include <iostream>
#include <stdio.h>
#include <fstream>

typedef unsigned char byte;
typedef unsigned long int UNIT;

using namespace std;
class MD5
{
public:
MD5();
MD5(const string &str);
MD5(const void* input, size_t length);
MD5(ifstream &ifs);
void update(const void* input,size_t length);
void update(const string &str);
void update(ifstream &ifs);
string toString();
const byte* digest();
void reset();
~MD5(void);
private:
void update(const byte*input ,size_t length);
void final();
void transform(const byte block[64]);
void encode(const UNIT *input,byte *output, size_t length);
void decode(const byte *input,UNIT *output, size_t length);
string bytesToHexString(const byte *input,size_t length);
private:
UNIT _state[4];
UNIT _count[2];
byte _buffer[64];
byte _digest[16];
bool _finished;

static const byte PADDING[64];
static const char HEX[16];
static const size_t BUFFER_SIZE = 1024;
};


MD5.cpp

#include "MD5.h"


/* F, G, H and I are basic MD5 functions.
*/
inline UNIT F(UNIT x, UNIT y,UNIT z) {return (UNIT)(((x) & (y)) | ((~x) & (z))); }
inline UNIT G(UNIT x, UNIT y,UNIT z) {return (UNIT)(((x) & (z)) | ((y) & (~z))); }
inline UNIT H(UNIT x, UNIT y, UNIT z) {return (UNIT )((x) ^ (y) ^ (z)) ;}
inline UNIT I(UNIT x, UNIT y, UNIT z) {return (UNIT)((y) ^ ((x) | (~z))) ;}

/* ROTATE_LEFT rotates x left n bits.
*/
inline UNIT ROTATE_LEFT(UNIT x,UNIT n) {return UNIT(((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.
*/
void FF(UNIT &a, UNIT &b, UNIT &c, UNIT &d, UNIT x, UNIT s, UNIT ac){
a += F ((b), (c), (d)) + (x) + ac;
a = ROTATE_LEFT ((a), (s));
a += b;
}
void GG(UNIT &a,UNIT &b, UNIT &c,UNIT &d, UNIT x, UNIT s,UNIT ac) {
(a) += G ((b), (c), (d)) + (x) + ac;
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
void HH(UNIT &a,UNIT &b, UNIT &c,UNIT &d, UNIT x, UNIT s,UNIT ac) {
(a) += H ((b), (c), (d)) + (x) + ac;
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
void II(UNIT &a,UNIT &b, UNIT &c,UNIT &d, UNIT x, UNIT s,UNIT ac) {
(a) += I ((b), (c), (d)) + (x) + ac;
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
const int s[16]={
7,12,17,22,
5,9,14,20,
4,11,16,23,
6,10,15,21
};
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 string &str){
reset();
update(str);
}
MD5::MD5(const void* input,size_t length){
reset();
update(input,length);
}
MD5::MD5(ifstream &ifs){
reset();
update(ifs);
}
void MD5::reset(){
_state[0] = 0x67452301;
_state[1] = 0xefcdab89;
_state[2] = 0x98badcfe;
_state[3] = 0x10325476;

_finished = false;
_count[0]=_count[1]=0;
}

const byte* MD5::digest(){
if(!_finished){
_finished = true;
final();
}
return _digest;
}
void MD5::final(){
byte bits[8];
UNIT oldState[4];
UNIT oldCount[2];
UNIT index,padLen;

memcpy(oldState,_state,16);
memcpy(oldCount,_count,8);

encode(_count,bits,8);

index = (UNIT)((_count[0]>>3)&(0x3f));
padLen = (index < 56)?(56-index):(120-index);

update(PADDING,padLen);
update(bits,8);
encode(_state,_digest,16);


}

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 &ifs){
if(!ifs){
return;
}
streamsize length;
char buffer[BUFFER_SIZE];
while(!ifs.eof()){
ifs.read(buffer,BUFFER_SIZE);
length = ifs.gcount();
if(length >0){
update(buffer,length);
}
}
ifs.close();
}
void MD5::update(const byte* input,size_t length){
UNIT index,partLen,i;
_finished = false;
//Compute number of bytes mod 64
index = (UNIT)((_count[0]>>3)&0x3f);

if((_count[0] += ((UNIT)length<<3))<((UNIT)length<<3)){
_count[1]++;
}
_count[1] += ((UNIT)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::transform(const byte block[64]){
UNIT a = _state[0], b = _state[1],c = _state[2], d = _state[3],x[16];
decode(block,x,64);
int i=0;

FF (a, b, c, d, x[ 0], s[i++], 0xd76aa478); /* 1 */
FF (d, a, b, c, x[ 1], s[i++], 0xe8c7b756); /* 2 */
FF (c, d, a, b, x[ 2], s[i++], 0x242070db); /* 3 */
FF (b, c, d, a, x[ 3], s[i++], 0xc1bdceee); /* 4 */
i-=4;
FF (a, b, c, d, x[ 4], s[i++], 0xf57c0faf); /* 5 */
FF (d, a, b, c, x[ 5], s[i++], 0x4787c62a); /* 6 */
FF (c, d, a, b, x[ 6], s[i++], 0xa8304613); /* 7 */
FF (b, c, d, a, x[ 7], s[i++], 0xfd469501); /* 8 */
i-=4;
FF (a, b, c, d, x[ 8], s[i++], 0x698098d8); /* 9 */
FF (d, a, b, c, x[ 9], s[i++], 0x8b44f7af); /* 10 */
FF (c, d, a, b, x[10], s[i++], 0xffff5bb1); /* 11 */
FF (b, c, d, a, x[11], s[i++], 0x895cd7be); /* 12 */
i-=4;
FF (a, b, c, d, x[12], s[i++], 0x6b901122); /* 13 */
FF (d, a, b, c, x[13], s[i++], 0xfd987193); /* 14 */
FF (c, d, a, b, x[14], s[i++], 0xa679438e); /* 15 */
FF (b, c, d, a, x[15], s[i++], 0x49b40821); /* 16 */


/* Round 2 */
GG (a, b, c, d, x[ 1], s[i++], 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], s[i++], 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], s[i++], 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], s[i++], 0xe9b6c7aa); /* 20 */
i-=4;
GG (a, b, c, d, x[ 5], s[i++], 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], s[i++], 0x2441453); /* 22 */
GG (c, d, a, b, x[15], s[i++], 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], s[i++], 0xe7d3fbc8); /* 24 */
i-=4;
GG (a, b, c, d, x[ 9], s[i++], 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], s[i++], 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], s[i++], 0xf4d50d87); /* 27 */
GG (b, c, d, a, x[ 8], s[i++], 0x455a14ed); /* 28 */
i-=4;
GG (a, b, c, d, x[13], s[i++], 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], s[i++], 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], s[i++], 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], s[i++], 0x8d2a4c8a); /* 32 */

/* Round 3 */
HH (a, b, c, d, x[ 5], s[i++], 0xfffa3942); /* 33 */
HH (d, a, b, c, x[ 8], s[i++], 0x8771f681); /* 34 */
HH (c, d, a, b, x[11], s[i++], 0x6d9d6122); /* 35 */
HH (b, c, d, a, x[14], s[i++], 0xfde5380c); /* 36 */
i-=4;
HH (a, b, c, d, x[ 1], s[i++], 0xa4beea44); /* 37 */
HH (d, a, b, c, x[ 4], s[i++], 0x4bdecfa9); /* 38 */
HH (c, d, a, b, x[ 7], s[i++], 0xf6bb4b60); /* 39 */
HH (b, c, d, a, x[10], s[i++], 0xbebfbc70); /* 40 */
i-=4;
HH (a, b, c, d, x[13], s[i++], 0x289b7ec6); /* 41 */
HH (d, a, b, c, x[ 0], s[i++], 0xeaa127fa); /* 42 */
HH (c, d, a, b, x[ 3], s[i++], 0xd4ef3085); /* 43 */
HH (b, c, d, a, x[ 6], s[i++], 0x4881d05); /* 44 */
i-=4;
HH (a, b, c, d, x[ 9], s[i++], 0xd9d4d039); /* 45 */
HH (d, a, b, c, x[12], s[i++], 0xe6db99e5); /* 46 */
HH (c, d, a, b, x[15], s[i++], 0x1fa27cf8); /* 47 */
HH (b, c, d, a, x[ 2], s[i++], 0xc4ac5665); /* 48 */

/* Round 4 */
II (a, b, c, d, x[ 0], s[i++], 0xf4292244); /* 49 */
II (d, a, b, c, x[ 7], s[i++], 0x432aff97); /* 50 */
II (c, d, a, b, x[14], s[i++], 0xab9423a7); /* 51 */
II (b, c, d, a, x[ 5], s[i++], 0xfc93a039); /* 52 */
i-=4;
II (a, b, c, d, x[12], s[i++], 0x655b59c3); /* 53 */
II (d, a, b, c, x[ 3], s[i++], 0x8f0ccc92); /* 54 */
II (c, d, a, b, x[10], s[i++], 0xffeff47d); /* 55 */
II (b, c, d, a, x[ 1], s[i++], 0x85845dd1); /* 56 */
i-=4;
II (a, b, c, d, x[ 8], s[i++], 0x6fa87e4f); /* 57 */
II (d, a, b, c, x[15], s[i++], 0xfe2ce6e0); /* 58 */
II (c, d, a, b, x[ 6], s[i++], 0xa3014314); /* 59 */
II (b, c, d, a, x[13], s[i++], 0x4e0811a1); /* 60 */
i-=4;
II (a, b, c, d, x[ 4], s[i++], 0xf7537e82); /* 61 */
II (d, a, b, c, x[11], s[i++], 0xbd3af235); /* 62 */
II (c, d, a, b, x[ 2], s[i++], 0x2ad7d2bb); /* 63 */
II (b, c, d, a, x[ 9], s[i++], 0xeb86d391); /* 64 */

_state[0] += a;
_state[1] += b;
_state[2] += c;
_state[3] += d;
}
void MD5::encode(const UNIT *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,UNIT *output,size_t length){
for(size_t i=0,j=0;j<length;i++,j+=4){
output[i] = ((UNIT)(input[j])|((UNIT)(input[j+1])<<8)
|((UNIT)(input[j+2])<<16)|((UNIT)(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);
}
MD5::~MD5(void)
{
}



test.cpp

#include "md5.h"
#include <iostream>

using namespace std;

void PrintMD5(const string &str, MD5 &md5) {
cout << "MD5(\"" << str << "\") = " << md5.toString() << endl;
}

string FileDigest(const string &file) {

ifstream in(file.c_str(), ios::binary);
if (!in)
return "";

MD5 md5;
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();
}

int main() {

cout<<"Please input a string:"<<endl;
string str;
while(getline(cin,str)){
cout<<"Source Code:"<<str<<endl<<"MD5:"<<MD5(str).toString()<<endl;
cout<<"Please input a string:"<<endl;
}
system("pause");
/*cout << MD5(ifstream("D:\\test.txt")).toString() << endl;
cout << MD5(ifstream("D:\\test.exe", ios::binary)).toString() << endl;
cout << FileDigest("D:\\test.exe") << endl;
*/

/* MD5 md5;
md5.update("");
PrintMD5("", md5);

md5.update("a");
PrintMD5("a", md5);

md5.update("bc");
PrintMD5("abc", md5);

md5.update("defghijklmnopqrstuvwxyz");
PrintMD5("abcdefghijklmnopqrstuvwxyz", md5);

md5.reset();
md5.update("message digest");
PrintMD5("message digest", md5);

md5.reset();
md5.update(ifstream("D:\\test.txt"));
PrintMD5("D:\\test.txt", md5);
return 0;
*/
}

截图:
MD5 C++源码 亲测可运行 - Eric - hacktimelin的博客
 
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