C++ MD5加密
2019-06-07
太久没写C++感觉自己变菜了，好吧这个也不是自己写的
先看目录结构
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;
*/
}运行截图看一下
借鉴自：https://blog.csdn.net/linmude/article/details/39274555
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