Java与C++实现相同的MD5加密算法简单实例

Java与C++实现相同的MD5加密算法简单实例

1、java版

package com.lyz.utils.common;

import java.io.UnsupportedEncodingException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

/**

* MD5加密

* @author liuyazhuang

*/

public class MD5Hash {

public static String md5Java(String message) {

String digest = null;

try {

MessageDigest md = MessageDigest.getInstance("MD5");

byte[] hash = md.digest(message.getBytes("UTF-8"));

//converting byte array to Hexadecimal String

StringBuilder sb = new StringBuilder(2 * hash.length);

for (byte b : hash) {

sb.append(String.format("%02x", b & 0xff));

}

digest = sb.toString();

} catch (UnsupportedEncodingException ex) {

//Logger.getLogger(StringReplace.class.getName()).log(Level.SEVERE, null, ex);

} catch (NoSuchAlgorithmException ex) {

//Logger.getLogger(StringReplace.class.getName()).log(Level.SEVERE, null, ex);

}

return digest;

}

public static void main(String[] args) {

System.out.println(md5Java("admin").toUpperCase());

}

}

2、C++代码

(1)md5.h

#include

#include

#include

#include

void MD5Digest(char *pszInput, unsigned long nInputSize, char *pszOutPut);

(2)md5.cpp

#include

#include

#include

#include

#include "md5.h"

typedef unsigned char *POINTER;

typedef unsigned short int UINT2;

typedef unsigned long int UINT4;

typedef struct

{

UINT4 state[4];

UINT4 count[2];

unsigned char buffer[64];

} MD5_CTX;

void MD5Init(MD5_CTX *);

void MD5Update(MD5_CTX *, unsigned char *, unsigned int);

void MD5Final(unsigned char [16], MD5_CTX *);

#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

static unsigned char PADDING[64] = {

0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

};

#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)))

#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

#define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }

#define GG(a, b, c, d, x, s, ac) { (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }

#define HH(a, b, c, d, x, s, ac) { (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }

#define II(a, b, c, d, x, s, ac) { (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }

inline void Encode(unsigned char *output, UINT4 *input, unsigned int len)

{

unsigned int i, j;

for (i = 0, j = 0; j < len; i++, j += 4) {

output[j] = (unsigned char)(input[i] & 0xff);

output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);

output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);

output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);

}

}

inline void Decode(UINT4 *output, unsigned char *input, unsigned int len)

{

unsigned int i, j;

for (i = 0, j = 0; j < len; i++, j += 4)

output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |

(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);

}

inline void MD5Transform (UINT4 state[4], unsigned char block[64])

{

UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

Decode (x, block, 64);

FF (a, b, c, d, x[ 0], S11, 0xd76aa478);

FF (d, a, b, c, x[ 1], S12, 0xe8c7b756);

FF (c, d, a, b, x[ 2], S13, 0x242070db);

FF (b, c, d, a, x[ 3], S14, 0xc1bdceee);

FF (a, b, c, d, x[ 4], S11, 0xf57c0faf);

FF (d, a, b, c, x[ 5], S12, 0x4787c62a);

FF (c, d, a, b, x[ 6], S13, 0xa8304613);

FF (b, c, d, a, x[ 7], S14, 0xfd469501);

FF (a, b, c, d, x[ 8], S11, 0x698098d8);

FF (d, a, b, c, x[ 9], S12, 0x8b44f7af);

FF (c, d, a, b, x[10], S13, 0xffff5bb1);

FF (b, c, d, a, x[11], S14, 0x895cd7be);

FF (a, b, c, d, x[12], S11, 0x6b901122);

FF (d, a, b, c, x[13], S12, 0xfd987193);

FF (c, d, a, b, x[14], S13, 0xa679438e);

FF (b, c, d, a, x[15], S14, 0x49b40821);

GG (a, b, c, d, x[ 1], S21, 0xf61e2562);

GG (d, a, b, c, x[ 6], S22, 0xc040b340);

GG (c, d, a, b, x[11], S23, 0x265e5a51);

GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa);

GG (a, b, c, d, x[ 5], S21, 0xd62f105d);

GG (d, a, b, c, x[10], S22, 0x2441453);

GG (c, d, a, b, x[15], S23, 0xd8a1e681);

GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8);

GG (a, b, c, d, x[ 9], S21, 0x21e1cde6);

GG (d, a, b, c, x[14], S22, 0xc33707d6);

GG (c, d, a, b, x[ 3], S23, 0xf4d50d87);

GG (b, c, d, a, x[ 8], S24, 0x455a14ed);

GG (a, b, c, d, x[13], S21, 0xa9e3e905);

GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8);

GG (c, d, a, b, x[ 7], S23, 0x676f02d9);

GG (b, c, d, a, x[12], S24, 0x8d2a4c8a);

HH (a, b, c, d, x[ 5], S31, 0xfffa3942);

HH (d, a, b, c, x[ 8], S32, 0x8771f681);

HH (c, d, a, b, x[11], S33, 0x6d9d6122);

HH (b, c, d, a, x[14], S34, 0xfde5380c);

HH (a, b, c, d, x[ 1], S31, 0xa4beea44);

HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9);

HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60);

HH (b, c, d, a, x[10], S34, 0xbebfbc70);

HH (a, b, c, d, x[13], S31, 0x289b7ec6);

HH (d, a, b, c, x[ 0], S32, 0xeaa127fa);

HH (c, d, a, b, x[ 3], S33, 0xd4ef3085);

HH (b, c, d, a, x[ 6], S34, 0x4881d05);

HH (a, b, c, d, x[ 9], S31, 0xd9d4d039);

HH (d, a, b, c, x[12], S32, 0xe6db99e5);

HH (c, d, a, b, x[15], S33, 0x1fa27cf8);

HH (b, c, d, a, x[ 2], S34, 0xc4ac5665);

II (a, b, c, d, x[ 0], S41, 0xf4292244);

II (d, a, b, c, x[ 7], S42, 0x432aff97);

II (c, d, a, b, x[14], S43, 0xab9423a7);

II (b, c, d, a, x[ 5], S44, 0xfc93a039);

II (a, b, c, d, x[12], S41, 0x655b59c3);

II (d, a, b, c, x[ 3], S42, 0x8f0ccc92);

II (c, d, a, b, x[10], S43, 0xffeff47d);

II (b, c, d, a, x[ 1], S44, 0x85845dd1);

II (a, b, c, d, x[ 8], S41, 0x6fa87e4f);

II (d, a, b, c, x[15], S42, 0xfe2ce6e0);

II (c, d, a, b, x[ 6], S43, 0xa3014314);

II (b, c, d, a, x[13], S44, 0x4e0811a1);

II (a, b, c, d, x[ 4], S41, 0xf7537e82);

II (d, a, b, c, x[11], S42, 0xbd3af235);

II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb);

II (b, c, d, a, x[ 9], S44, 0xeb86d391);

state[0] += a;

state[1] += b;

state[2] += c;

state[3] += d;

memset ((POINTER)x, 0, sizeof (x));

}

inline void MD5Init(MD5_CTX *context)

{

context->count[0] = context->count[1] = 0;

context->state[0] = 0x67452301;

context->state[1] = 0xefcdab89;

context->state[2] = 0x98badcfe;

context->state[3] = 0x10325476;

}

inline void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen)

{

unsigned int i, index, partLen;

index = (unsigned int)((context->count[0] >> 3) & 0x3F);

if ((context->count[0] += ((UINT4)inputLen << 3))

< ((UINT4)inputLen << 3))

context->count[1]++;

context->count[1] += ((UINT4)inputLen >> 29);

partLen = 64 - index;

if (inputLen >= partLen) {

memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);

MD5Transform(context->state, context->buffer);

for (i = partLen; i + 63 < inputLen; i += 64)

MD5Transform (context->state, &input[i]);

index = 0;

}

else

i = 0;

memcpy((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);

}

inline void MD5Final(unsigned char digest[16], MD5_CTX *context)

{

unsigned char bits[8];

unsigned int index, padLen;

Encode (bits, context->count, 8);

index = (unsigned int)((context->count[0] >> 3) & 0x3f);

padLen = (index < 56) ? (56 - index) : (120 - index);

MD5Update (context, PADDING, padLen);

MD5Update (context, bits, 8);

Encode (digest, context->state, 16);

memset ((POINTER)context, 0, sizeof (*context));

}

void MD5Digest(char *pszInput, unsigned long nInputSize, char *pszOutPut)

{

MD5_CTX context;

unsigned int len = strlen (pszInput);

MD5Init (&context);

MD5Update (&context, (unsigned char *)pszInput, len);

MD5Final ((unsigned char *)pszOutPut, &context);

}

main()

{ char szDigest[16];

char encrypt[200];

printf("请输入要计算MD5值的字符串:");

gets(encrypt);

printf("\n加密结果:");

MD5Digest(encrypt,strlen(encrypt),szDigest);

int i;

for (i=0;i<16;i++) printf ("%02X",(unsigned char)szDigest[i]);

getchar();

}

3、运行效果

这里我们都以输入123456为例

(1)java输出结果如下：

(2)C++输出结果如下：

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