C++ 递归遍历文件并计算MD5的实例代码
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2022-06-22 23:33:39
递归遍历文件夹，对比文件md5首先，需要引用 md5 的相关代码，参考这篇文章，防止链接内容被删除，这里再记录一次：md5.h #ifndef md5_h #define md5_h #...
递归遍历文件夹，对比文件md5
首先，需要引用 md5 的相关代码，参考这篇文章，防止链接内容被删除，这里再记录一次：
md5.h
#ifndef md5_h
#define md5_h
#include <string>
#include <fstream>
/* type define */
typedef unsigned char byte;
typedef unsigned int uint32;
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();
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];
enum { buffer_size = 1024 };
};
#endif /*md5_h*/
md5.cpp
#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); }
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);
}
调用例子:
#include "md5.h"
#include <iostream>
using namespace std;
void printmd5(const string& str, md5& md5) {
cout << "md5("" << str << "") = " << md5.tostring() << endl;
}
int main() {
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;
}
配置好了以后开始写我们的递归遍历函数：
/* 遍历目录下所有文件,对比 md5
path：文件夹路径（末尾不要有‘\‘）
format：要筛选的文件后缀名
str_md5：md5 字符串
isfound：是否匹配到与 str_md5 相等的 md5 值
*/
void findallfile_md5(const char * path,const char * format,string str_md5,bool &isfound)
{
// 路径末尾追加 ‘\*.*‘
char newpath[200];
strcpy(newpath, path);
strcat(newpath, "\\*.*");
// 找到目录下的第一个文件 #include <io.h>
_finddata_t finddata;
/* 文件信息结构体
struct _finddata_t{
unsigned attrib; // 文件属性
time_t time_create; // 创建时的时间戳
time_t time_access; // 最后一次被访问时的时间戳
time_t time_write; // 最后一次被修改时的时间戳
_fsize_t size; // 文件字节大小
char name[_max_fname]; // 文件名
};
*/
long handle = _findfirst(newpath, &finddata);
if (handle == -1){return;}
// 遍历文件和文件夹
while (_findnext(handle, &finddata) == 0){
// 文件夹
if (finddata.attrib & _a_subdir){
// 文件夹名不能有敏感字符 ‘.‘、‘..‘
if (strcmp(finddata.name, ".") == 0 || strcmp(finddata.name, "..") == 0){continue;}
// 进入这个文件夹继续遍历
strcpy(newpath, path);
strcat(newpath, "\\");
strcat(newpath, finddata.name);
findallfile_md5(newpath,format,str_md5,isfound);
}
// 文件
else{
// 判断是不是指定后缀的文件
if(strstr( finddata.name,format)){
// 输出（用来测试）
//cout << "finddata.size = " << finddata.size << endl;
//cout << "finddata.name = " << finddata.name << endl;
//cout << "path = " << path << endl;
// 取文件全路径
string str_fullpath = path;
str_fullpath+="\\"; str_fullpath+=finddata.name;
// 取文件 md5,判断是否匹配特征
md5 md5;
md5.reset();
md5.update(ifstream(str_fullpath));
if(md5.tostring() == str_md5){isfound = true;}
}
}
}
// 关闭搜索句柄
_findclose(handle);
}
调用例子（遍历%temp% 下的文件）
// 获取 %temp% 目录
tchar lptemppathbuffer[max_path];
gettemppath(max_path,lptemppathbuffer);
// 删除末尾 ‘\‘
string str_temppath = lptemppathbuffer;
str_temppath = str_temppath.substr(0,str_temppath.length()-1);
// 遍历目录下所有 exe 文件,匹配 md5
bool isfound = false;
findallfile_md5(stringtocharp(str_temppath),".exe","52f5ce92c6f72c7e193b560bf4e76330",isfound);
if(isfound){cout << "找到了！" << endl;;}
知识点扩展：
c++计算md5
#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); \
}
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);
}
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