C++与Java实现相同MD5算法(读取文件+字符串)

Java计算MD5，这里直接用的MessageDigest类
要计算的文件+追加字符串

简单看下文件内容

JAVA代码

import java.security.MessageDigest;
import  java.util.Random;
import  java.io.*;

public class md5{
   public static void main (String args[]){
       try {    
            
            File f = new File("C:\\Users\\lenovo\\Desktop\\随笔\\C++与Java实现相同MD5算法(读取文件+字符串)\\MD5_Test.bin");
            byte[] data = new byte[2048];
            new FileInputStream(f).read(data);
            MessageDigest instance = MessageDigest.getInstance("MD5");
            instance.update(data);
            instance.update(Integer.toString(270843106).getBytes());
            byte[] md5Key = instance.digest();
            StringBuilder stringBuilder = new StringBuilder(md5Key.length * 2);
            char[] cArr = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
            for (int i2 = 0; i2 < 16; i2++) {
                byte b = md5Key[i2];
                stringBuilder.append(cArr[(b >>> 4) & 15]).append(cArr[b & 15]);
            }
            String stringBuilder2 = stringBuilder.toString();
            System.out.println("xxxx:"+stringBuilder2);
        
       }catch (Throwable t) {
           System.out.println("222222");
           
       }       
    }
    
}

这里直接cmd运行

C++代码（这里网上随便找的 C代码，改了下源码，封装成C++）
New_MD5.h

#pragma once
#ifndef   MD5ADD_H
#define   MD5ADD_H


using namespace std;
//typedef unsigned long int UINT4;


class  NEW_MD5
{
    struct MD5_CTX {
        unsigned long int  i[2];                   /* number of _bits_ handled mod 2^64 */
        unsigned long int  buf[4];                                    /* scratch buffer */
        unsigned char in[64];                              /* input buffer */
        unsigned char digest[16];     /* actual digest after MD5Final call */
    }*PMD5_CTX;
public:
    NEW_MD5();
    ~NEW_MD5();


    /************************************************************************/
    /*计算（文件指定长度+传入字符串）MD5*/
    /* path:文件路径,
    /* BeReadSize：读取文件长度
    /* md5_len：返回MD5长度（16/32）
    /* SpliceString：追加字符串
    /************************************************************************/
    static char * MD5_file(const char *path, int BeReadSize, int md5_len, const char* SpliceString);


public:
    void MD5Init();
    void MD5Init1(MD5_CTX *mdContext);
    void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen);
    void MD5Final(MD5_CTX *mdContext);
    void Transform(unsigned long int  *buf, unsigned long int *in);
     
};

#endif /*MD5ADDH*/

New_MD5.cpp

#include "pch.h"
#include "New_MD5.h"
#include <memory.h>
#include <stdlib.h>  
#include <string.h>  
#include <iostream>

using namespace std;
static unsigned char PADDING[64] = {
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

NEW_MD5::NEW_MD5()
{
    

}

NEW_MD5::~NEW_MD5()
{

}

void NEW_MD5::MD5Init()
{

}

void NEW_MD5::MD5Init1(MD5_CTX *mdContext)
{
    mdContext->i[0] = mdContext->i[1] = (unsigned long int)0;

    mdContext->buf[0] = (unsigned long int)0x67452301;
    mdContext->buf[1] = (unsigned long int)0xefcdab89;
    mdContext->buf[2] = (unsigned long int)0x98badcfe;
    mdContext->buf[3] = (unsigned long int)0x10325476;
    
}


/* F, G and H are basic MD5 functions: selection, majority, parity */
#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) + (unsigned long int)(ac);  (a) = ROTATE_LEFT ((a), (s));  (a) += (b);}  
#define GG(a, b, c, d, x, s, ac) {(a) += G ((b), (c), (d)) + (x) + (unsigned long int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }  
#define HH(a, b, c, d, x, s, ac) {(a) += H ((b), (c), (d)) + (x) + (unsigned long int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }  
#define II(a, b, c, d, x, s, ac) {(a) += I ((b), (c), (d)) + (x) + (unsigned long int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }  


void NEW_MD5::MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
{
    unsigned long int in[16];
    int mdi;
    unsigned int i, ii;

    /* compute number of bytes mod 64 */
    mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

    /* update number of bits */
    if ((mdContext->i[0] + ((unsigned long int)inLen << 3)) < mdContext->i[0])
        mdContext->i[1]++;
    mdContext->i[0] += ((unsigned long int)inLen << 3);
    mdContext->i[1] += ((unsigned long int)inLen >> 29);

    while (inLen--) {
        /* add new character to buffer, increment mdi */
        mdContext->in[mdi++] = *inBuf++;

        /* transform if necessary */
        if (mdi == 0x40) {
            for (i = 0, ii = 0; i < 16; i++, ii += 4)
                in[i] = (((unsigned long int)mdContext->in[ii + 3]) << 24) |
                (((unsigned long int)mdContext->in[ii + 2]) << 16) |
                (((unsigned long int)mdContext->in[ii + 1]) << 8) |
                ((unsigned long int)mdContext->in[ii]);
            Transform(mdContext->buf, in);
            mdi = 0;
        }
    }
}

void NEW_MD5::MD5Final(MD5_CTX *mdContext)

{
    unsigned long int in[16];
    int mdi;
    unsigned int i, ii;
    unsigned int padLen;

    /* save number of bits */
    in[14] = mdContext->i[0];
    in[15] = mdContext->i[1];

    /* compute number of bytes mod 64 */
    mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

    /* pad out to 56 mod 64 */
    padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
    MD5Update(mdContext, PADDING, padLen);

    /* append length in bits and transform */
    for (i = 0, ii = 0; i < 14; i++, ii += 4)
        in[i] = (((unsigned long int)mdContext->in[ii + 3]) << 24) |
        (((unsigned long int)mdContext->in[ii + 2]) << 16) |
        (((unsigned long int)mdContext->in[ii + 1]) << 8) |
        ((unsigned long int)mdContext->in[ii]);
    Transform(mdContext->buf, in);

    /* store buffer in digest */
    for (i = 0, ii = 0; i < 4; i++, ii += 4) {
        mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
        mdContext->digest[ii + 1] =
            (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
        mdContext->digest[ii + 2] =
            (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
        mdContext->digest[ii + 3] =
            (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
    }
}

/* Basic MD5 step. Transform buf based on in.
*/
void NEW_MD5::Transform(unsigned long int *buf, unsigned long int *in)
{
    unsigned long int a = buf[0], b = buf[1], c = buf[2], d = buf[3];

    /* Round 1 */
#define S11 7  
#define S12 12  
#define S13 17  
#define S14 22  
    FF(a, b, c, d, in[0], S11, 3614090360); /* 1 */
    FF(d, a, b, c, in[1], S12, 3905402710); /* 2 */
    FF(c, d, a, b, in[2], S13, 606105819); /* 3 */
    FF(b, c, d, a, in[3], S14, 3250441966); /* 4 */
    FF(a, b, c, d, in[4], S11, 4118548399); /* 5 */
    FF(d, a, b, c, in[5], S12, 1200080426); /* 6 */
    FF(c, d, a, b, in[6], S13, 2821735955); /* 7 */
    FF(b, c, d, a, in[7], S14, 4249261313); /* 8 */
    FF(a, b, c, d, in[8], S11, 1770035416); /* 9 */
    FF(d, a, b, c, in[9], S12, 2336552879); /* 10 */
    FF(c, d, a, b, in[10], S13, 4294925233); /* 11 */
    FF(b, c, d, a, in[11], S14, 2304563134); /* 12 */
    FF(a, b, c, d, in[12], S11, 1804603682); /* 13 */
    FF(d, a, b, c, in[13], S12, 4254626195); /* 14 */
    FF(c, d, a, b, in[14], S13, 2792965006); /* 15 */
    FF(b, c, d, a, in[15], S14, 1236535329); /* 16 */

    /* Round 2 */
#define S21 5  
#define S22 9  
#define S23 14  
#define S24 20  
    GG(a, b, c, d, in[1], S21, 4129170786); /* 17 */
    GG(d, a, b, c, in[6], S22, 3225465664); /* 18 */
    GG(c, d, a, b, in[11], S23, 643717713); /* 19 */
    GG(b, c, d, a, in[0], S24, 3921069994); /* 20 */
    GG(a, b, c, d, in[5], S21, 3593408605); /* 21 */
    GG(d, a, b, c, in[10], S22, 38016083); /* 22 */
    GG(c, d, a, b, in[15], S23, 3634488961); /* 23 */
    GG(b, c, d, a, in[4], S24, 3889429448); /* 24 */
    GG(a, b, c, d, in[9], S21, 568446438); /* 25 */
    GG(d, a, b, c, in[14], S22, 3275163606); /* 26 */
    GG(c, d, a, b, in[3], S23, 4107603335); /* 27 */
    GG(b, c, d, a, in[8], S24, 1163531501); /* 28 */
    GG(a, b, c, d, in[13], S21, 2850285829); /* 29 */
    GG(d, a, b, c, in[2], S22, 4243563512); /* 30 */
    GG(c, d, a, b, in[7], S23, 1735328473); /* 31 */
    GG(b, c, d, a, in[12], S24, 2368359562); /* 32 */

    /* Round 3 */
#define S31 4  
#define S32 11  
#define S33 16  
#define S34 23  
    HH(a, b, c, d, in[5], S31, 4294588738); /* 33 */
    HH(d, a, b, c, in[8], S32, 2272392833); /* 34 */
    HH(c, d, a, b, in[11], S33, 1839030562); /* 35 */
    HH(b, c, d, a, in[14], S34, 4259657740); /* 36 */
    HH(a, b, c, d, in[1], S31, 2763975236); /* 37 */
    HH(d, a, b, c, in[4], S32, 1272893353); /* 38 */
    HH(c, d, a, b, in[7], S33, 4139469664); /* 39 */
    HH(b, c, d, a, in[10], S34, 3200236656); /* 40 */
    HH(a, b, c, d, in[13], S31, 681279174); /* 41 */
    HH(d, a, b, c, in[0], S32, 3936430074); /* 42 */
    HH(c, d, a, b, in[3], S33, 3572445317); /* 43 */
    HH(b, c, d, a, in[6], S34, 76029189); /* 44 */
    HH(a, b, c, d, in[9], S31, 3654602809); /* 45 */
    HH(d, a, b, c, in[12], S32, 3873151461); /* 46 */
    HH(c, d, a, b, in[15], S33, 530742520); /* 47 */
    HH(b, c, d, a, in[2], S34, 3299628645); /* 48 */

    /* Round 4 */
#define S41 6  
#define S42 10  
#define S43 15  
#define S44 21  
    II(a, b, c, d, in[0], S41, 4096336452); /* 49 */
    II(d, a, b, c, in[7], S42, 1126891415); /* 50 */
    II(c, d, a, b, in[14], S43, 2878612391); /* 51 */
    II(b, c, d, a, in[5], S44, 4237533241); /* 52 */
    II(a, b, c, d, in[12], S41, 1700485571); /* 53 */
    II(d, a, b, c, in[3], S42, 2399980690); /* 54 */
    II(c, d, a, b, in[10], S43, 4293915773); /* 55 */
    II(b, c, d, a, in[1], S44, 2240044497); /* 56 */
    II(a, b, c, d, in[8], S41, 1873313359); /* 57 */
    II(d, a, b, c, in[15], S42, 4264355552); /* 58 */
    II(c, d, a, b, in[6], S43, 2734768916); /* 59 */
    II(b, c, d, a, in[13], S44, 1309151649); /* 60 */
    II(a, b, c, d, in[4], S41, 4149444226); /* 61 */
    II(d, a, b, c, in[11], S42, 3174756917); /* 62 */
    II(c, d, a, b, in[2], S43, 718787259); /* 63 */
    II(b, c, d, a, in[9], S44, 3951481745); /* 64 */

    buf[0] += a;
    buf[1] += b;
    buf[2] += c;
    buf[3] += d;
}

/************************************************************************/
/*计算文件md5值*/
/*path:文件路径
*BeReadSize:预读文件长度
*md5_len:MD5长度（32/16）
*SpliceString:追加字符串
/************************************************************************/
char *NEW_MD5::MD5_file(const char *path, int BeReadSize, int md5_len, const char* SpliceString)
{
    NEW_MD5 md;
    FILE *fp = fopen(path, "rb");
    MD5_CTX mdContext;
    int bytes;
    char *file_md5;
    int i;


    if (fp == NULL) {
        fprintf(stderr, "fopen %s failed\n", path);
        return NULL;
    }

    unsigned char *data = (unsigned char*)malloc(BeReadSize + strlen(SpliceString));
    md.MD5Init1(&mdContext);
    bytes = fread(data, 1, BeReadSize, fp);


    for (int i = 0; i < strlen(SpliceString); i++)
    {
        data[BeReadSize + i] = SpliceString[i];
    }

    int kk = strlen(SpliceString);

    md.MD5Update(&mdContext, data, bytes + strlen(SpliceString));

    md.MD5Final(&mdContext);

    file_md5 = (char *)malloc((md5_len + 1) * sizeof(char));
    if (file_md5 == NULL)
    {
        fprintf(stderr, "malloc failed.\n");
        return NULL;
    }
    memset(file_md5, 0, (md5_len + 1));

    if (md5_len == 16)
    {
        for (i = 4; i < 12; i++)
        {
            sprintf(&file_md5[(i - 4) * 2], "%02x", mdContext.digest[i]);
        }
    }
    else if (md5_len == 32)
    {
        for (i = 0; i < 16; i++)
        {
            sprintf(&file_md5[i * 2], "%02x", mdContext.digest[i]);
        }
    }
    else
    {
        fclose(fp);
        free(file_md5);
        return NULL;
    }

    fclose(fp);
    return file_md5;
}

main.cpp

#include "pch.h"
#include "New_MD5.h"
#include <iostream>

using namespace std;
int main()
{
    //char *NEW_MD5::MD5_file(const char *path, int BeReadSize, int md5_len, const char* SpliceString)
    const char* strFilePath = "C:\\Users\\lenovo\\Desktop\\随笔\\C++与Java实现相同MD5算法(读取文件+字符串)\\MD5_Test.bin";
    const char* strSpliceString = "270843106";
    std::string strMd5 = NEW_MD5::MD5_file(strFilePath,2048,32, strSpliceString);
    cout << "测试："<<strMd5.c_str() << endl;

    return 0;
}

运行结果

C++与Java实现相同MD5算法(读取文件+字符串)

猜你喜欢