C++|C++ 递归遍历文件并计算MD5的实例代码 C++递归遍历文件并计算MD5的实

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 #include /* 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-digestoperation, processing another message block, and updating thecontext.*/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 thethe 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 isa 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 isa 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 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 _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; ; }

【C++|C++ 递归遍历文件并计算MD5的实例代码】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-digestoperation, processing another message block, and updating thecontext.*/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 thethe 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 isa 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 isa 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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