C++ 递归遍历文件并计算MD5的实例代码

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);
}

到此这篇关于C++ 递归遍历文件并计算MD5的实例代码的文章就介绍到这了,更多相关C++ 递归遍历文件并计算MD5内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们!

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