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
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