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2024-07-06 13:43:21 250人阅读

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转载请注明本文出处：http://blog.csdn.net/hk_jh/article/details/27368279

1、什么是wordpress？

关于wordpress的介绍请自行参照维基百科：http://zh.wikipedia.org/wiki/Wordpress

其实只要掌握了其加密原理，再用高效的语言实现之，暴力破解不就很容易了吗？

2、wordpress用户密码的加密算法

首先，wordpress是开源的，大家可以从官网下载源代码。另外wordpress是用php语言编写的。

wordpress用户密码加密后的密文格式：

$P$BcSda3/tRXQcRZMPj3cUI0jZJFdMgL0
$P$BNclJc4wbM.vSjKPYxKggDPtw3siXQ0

以下是其解压后文件夹/include下的class-phpass.php文件的代码，主要包含了对用户密码进行加密的类及函数；

<?php
/**
 * Portable PHP password hashing framework.
 * @package phpass
 * @since 2.5.0
 * @version 0.3 / WordPress
 * @link http://www.openwall.com/phpass/
 */

#
# Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
# the public domain.  Revised in subsequent years, still public domain.
#
# There's absolutely no warranty.
#
# Please be sure to update the Version line if you edit this file in any way.
# It is suggested that you leave the main version number intact, but indicate
# your project name (after the slash) and add your own revision information.
#
# Please do not change the "private" password hashing method implemented in
# here, thereby making your hashes incompatible.  However, if you must, please
# change the hash type identifier (the "$P$") to something different.
#
# Obviously, since this code is in the public domain, the above are not
# requirements (there can be none), but merely suggestions.
#

/**
 * Portable PHP password hashing framework.
 *
 * @package phpass
 * @version 0.3 / WordPress
 * @link http://www.openwall.com/phpass/
 * @since 2.5.0
 */
class PasswordHash {
	var $itoa64;
	var $iteration_count_log2;
	var $portable_hashes;
	var $random_state;

	function PasswordHash($iteration_count_log2, $portable_hashes)
	{
		$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

		if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)
			$iteration_count_log2 = 8;
		$this->iteration_count_log2 = $iteration_count_log2;

		$this->portable_hashes = $portable_hashes;

		$this->random_state = microtime() . uniqid(rand(), TRUE); // removed getmypid() for compatibility reasons
	}

	function get_random_bytes($count)
	{
		$output = '';
		if ( @is_readable('/dev/urandom') &&
		    ($fh = @fopen('/dev/urandom', 'rb'))) {
			$output = fread($fh, $count);
			fclose($fh);
		}

		if (strlen($output) < $count) {
			$output = '';
			for ($i = 0; $i < $count; $i += 16) {
				$this->random_state =
				    md5(microtime() . $this->random_state);
				$output .=
				    pack('H*', md5($this->random_state));
			}
			$output = substr($output, 0, $count);
		}

		return $output;
	}

	function encode64($input, $count)
	{
		$output = '';
		$i = 0;
		do {
			$value = http://www.mamicode.com/ord($input[$i++]);>
3、算法分析

（1）wordpress密码加密后的密文格式：
$P$B12345678huiyw4r7qhfuhs8yjmd6ef
$P$912345678huiyw4r7qhfuhs8yjmd6ef

第一段：$P$格式固定
第二段：只有一个字符。若php版本大于5.0则为B，否则为9
第三段：8位salt
第四段：22位，真正加密后的密码

（2）密文的加密方法
php版本高于5.0

$hash = md5($salt . $password, TRUE);
		do
		{
			$hash = md5($hash . $password, TRUE);
		} while (--$count);

［注］“.”在php中是连接运算
参数TRUR表示加密结果取16字节二进制
count取2的13次方：8192

php版本低于5.0

$hash = pack('H*', md5($salt . $password));
		do 
		{
			$hash = pack('H*', md5($hash . $password));
		} while (--$count);

［注］php低于5.0 md5返回的是32位十六进制字符串形式
pack（H＊）将md5结果转化为二进制
count取2的11次方：2048

上述方法得到的 $hash 再进行base64加密：
（3）wordpress的base64算法
64位字符表比较特殊，与普通的字符表顺序有差异：
itoa64 = ‘./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz‘;

//input即hash，count＝16

function encode64($input, $count)
	{
		$output = '';
		$i = 0;
		do 
		{
			$value = http://www.mamicode.com/ord($input[$i++]);//返回第一个字符的acsii值>
上述方法即可得到22位加密后的密码

4、用C实现wordpress的加密

以下是本人自己用C实现的代码，如有错误，敬请指正！

wordpress.c 文件：

#include <stdio.h>
#include <string.h>
#include "md5.h"
#include "wordpress.h"

#define WORDPRESS_MD5_CHAR_NUM 16

unsigned char base64Char[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

void md5_to_unsigned_char(unsigned char *hash)
{
	int i;
	unsigned char md5[17];

	for (i = 0; i < 16; i++)
	{
		if (hash[2*i] >= '0' && hash[2*i] <= '9')
			md5[i] = (hash[2*i] - '0') << 4;
		else if (hash[2*i] >= 'a' && hash[2*i] <= 'f')
			md5[i] = (hash[2*i] - 'a') <<4;

		if (hash[2*i+1] >= '0' && hash[2*i+1] <= '9')
			md5[i] = md5[i] | ((hash[2*i+1] - '0') & 0x0f);
		else if (hash[2*i+1] >= 'a' && hash[2*i+1] <= 'f')
			md5[i] = md5[i] | ((hash[2*i+1] - 'a') & 0x0f);
	}
	md5[16] = '\0';

	for (i = 0; i < 16; i++)
		hash[i] = md5[i];
	hash[16] = '\0';
}

void base64Encode(unsigned char *md5, unsigned char *result)
{
	int num_24bits = 5;
	int i;
  
	for (i = 0; i < num_24bits; ++i)
	{
		result[4 * i + 0] = base64Char[(md5[3 * i] >> 2) & 0x3F];  
		result[4 * i + 1] = base64Char[(((md5[3 * i] & 0x3) << 4) | (md5[3 * i + 1] >> 4)) & 0x3F];  
		result[4 * i + 2] = base64Char[((md5[3 * i + 1] << 2) | (md5[3 * i + 2] >> 6)) & 0x3F];  
		result[4 * i + 3] = base64Char[md5[3 * i + 2] & 0x3F];
	}
	result[20] = base64Char[md5[15] >> 2];
	result[21] = base64Char[(md5[15] << 4) & 0x3F];

	result[22] = '\0';
}  


int wordpress( unsigned char * salt, unsigned char *passwd, int count, unsigned char *code )
{
	int i, j;
	char symbol;
	unsigned char buffer[100];
	unsigned char base64_code[23];

	int len = strlen( (char *)passwd );


	if (strlen( (char *)salt ) != 8)
	{
		printf("illegal salt!\n");
		return 1;
	}

	if (count != 8192 && count != 2048)
	{
		printf("illegal count!\n");
		return 1;
	}

	//first time use md5 function with salt
	strcpy( (char *)buffer, (char *)salt );
	strcat( (char *)buffer, (char *)passwd );
	MD5( buffer, strlen( (char *)buffer), buffer, 0 );
	md5_to_unsigned_char( buffer );

	//count times md5 function
	for (i = 0; i < count; i++)
	{
		memcpy( (void *)&buffer[WORDPRESS_MD5_CHAR_NUM], passwd, len );

		MD5( buffer, WORDPRESS_MD5_CHAR_NUM + len, buffer, 0 );

		md5_to_unsigned_char( buffer );
	}

	memcpy( (void *)code, buffer, 32);

	base64Encode( buffer, base64_code );

	if (count == 8192)
		symbol = 'B';
	else if(count == 2048)
		symbol = '9';

	strcpy( (char *)code, "$P$" );

	code[3] = symbol;
	code[4] = '\0';

	strcat( (char *)code, (char *)salt);

	memcpy( (void *)&code[12], base64_code, 22);

	return 0;

}

附上以前自己写的md5代码：

#include "md5.h"
#include <stdio.h>
#include <memory.h>
#include <string.h>


#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 + 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; }                                              
void MD5Init(MD5_CTX *context);
void MD5Update(MD5_CTX *context,unsigned char *input,unsigned int inputlen);
void MD5Final(MD5_CTX *context,unsigned char digest[16]);
void MD5Transform(unsigned int state[4],unsigned char block[64]);
void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len);
void MD5Decode(unsigned int *output,unsigned char *input,unsigned int len);
 
      
    unsigned char PADDING[]={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};
      
    void MD5Init(MD5_CTX *context)
    {
        context->count[0] = 0;
        context->count[1] = 0;
        context->state[0] = 0x67452301;
        context->state[1] = 0xEFCDAB89;
        context->state[2] = 0x98BADCFE;
        context->state[3] = 0x10325476;
    }
    void MD5Update(MD5_CTX *context,unsigned char *input,unsigned int inputlen)  
    {  
        unsigned int i = 0,index = 0,partlen = 0;  
        index = (context->count[0] >> 3) & 0x3F;  
        partlen = 64 - index;  
        context->count[0] += inputlen << 3;  
        if(context->count[0] < (inputlen << 3))  
            context->count[1]++;  
        context->count[1] += inputlen >> 29;  
      
        if(inputlen >= partlen)  
        {  
            memcpy(&context->buffer[index],input,partlen);  
            MD5Transform(context->state,context->buffer);  
            for(i = partlen;i+64 <= inputlen;i+=64)  
                MD5Transform(context->state,&input[i]);  
            index = 0;          
        }    
        else  
        {  
            i = 0;  
        }  
        memcpy(&context->buffer[index],&input[i],inputlen-i);  
    }  
    void MD5Final(MD5_CTX *context,unsigned char digest[16])  
    {  
        unsigned int index = 0,padlen = 0;  
        unsigned char bits[8];  
        index = (context->count[0] >> 3) & 0x3F;  
        padlen = (index < 56)?(56-index):(120-index);  
        MD5Encode(bits,context->count,8);  
        MD5Update(context,PADDING,padlen);  
        MD5Update(context,bits,8);  
        MD5Encode(digest,context->state,16);  
    }  
    void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len)  
    {  
        unsigned int i = 0,j = 0;  
        while(j < len)  
        {  
            output[j] = input[i] & 0xFF;    
            output[j+1] = (input[i] >> 8) & 0xFF;  
            output[j+2] = (input[i] >> 16) & 0xFF;  
            output[j+3] = (input[i] >> 24) & 0xFF;  
            i++;  
            j+=4;  
        }  
    }  
    void MD5Decode(unsigned int *output,unsigned char *input,unsigned int len)
    {  
        unsigned int i = 0,j = 0;  
        while(j < len)  
        {  
            output[i] = (input[j]) |  
                (input[j+1] << 8) |  
                (input[j+2] << 16) |  
                (input[j+3] << 24);  
            i++;  
            j+=4;   
        }  
    }  
    void MD5Transform(unsigned int state[4],unsigned char block[64])
    {  
        unsigned int a = state[0];  
        unsigned int b = state[1];  
        unsigned int c = state[2];  
        unsigned int d = state[3];  
        unsigned int x[64];  
        MD5Decode(x,block,64);  
        FF(a, b, c, d, x[ 0], 7, 0xd76aa478);   
        FF(d, a, b, c, x[ 1], 12, 0xe8c7b756);   
        FF(c, d, a, b, x[ 2], 17, 0x242070db);   
        FF(b, c, d, a, x[ 3], 22, 0xc1bdceee);   
        FF(a, b, c, d, x[ 4], 7, 0xf57c0faf);   
        FF(d, a, b, c, x[ 5], 12, 0x4787c62a);   
        FF(c, d, a, b, x[ 6], 17, 0xa8304613);   
        FF(b, c, d, a, x[ 7], 22, 0xfd469501);   
        FF(a, b, c, d, x[ 8], 7, 0x698098d8);   
        FF(d, a, b, c, x[ 9], 12, 0x8b44f7af);   
        FF(c, d, a, b, x[10], 17, 0xffff5bb1);   
        FF(b, c, d, a, x[11], 22, 0x895cd7be);   
        FF(a, b, c, d, x[12], 7, 0x6b901122);   
        FF(d, a, b, c, x[13], 12, 0xfd987193);   
        FF(c, d, a, b, x[14], 17, 0xa679438e);   
        FF(b, c, d, a, x[15], 22, 0x49b40821);   
      
          
        GG(a, b, c, d, x[ 1], 5, 0xf61e2562);   
        GG(d, a, b, c, x[ 6], 9, 0xc040b340);   
        GG(c, d, a, b, x[11], 14, 0x265e5a51);   
        GG(b, c, d, a, x[ 0], 20, 0xe9b6c7aa);   
        GG(a, b, c, d, x[ 5], 5, 0xd62f105d);   
        GG(d, a, b, c, x[10], 9,  0x2441453);   
        GG(c, d, a, b, x[15], 14, 0xd8a1e681);   
        GG(b, c, d, a, x[ 4], 20, 0xe7d3fbc8);   
        GG(a, b, c, d, x[ 9], 5, 0x21e1cde6);   
        GG(d, a, b, c, x[14], 9, 0xc33707d6);   
        GG(c, d, a, b, x[ 3], 14, 0xf4d50d87);   
        GG(b, c, d, a, x[ 8], 20, 0x455a14ed);   
        GG(a, b, c, d, x[13], 5, 0xa9e3e905);   
        GG(d, a, b, c, x[ 2], 9, 0xfcefa3f8);   
        GG(c, d, a, b, x[ 7], 14, 0x676f02d9);   
        GG(b, c, d, a, x[12], 20, 0x8d2a4c8a);   
      
          
        HH(a, b, c, d, x[ 5], 4, 0xfffa3942);   
        HH(d, a, b, c, x[ 8], 11, 0x8771f681);   
        HH(c, d, a, b, x[11], 16, 0x6d9d6122);   
        HH(b, c, d, a, x[14], 23, 0xfde5380c);   
        HH(a, b, c, d, x[ 1], 4, 0xa4beea44);   
        HH(d, a, b, c, x[ 4], 11, 0x4bdecfa9);   
        HH(c, d, a, b, x[ 7], 16, 0xf6bb4b60);   
        HH(b, c, d, a, x[10], 23, 0xbebfbc70);   
        HH(a, b, c, d, x[13], 4, 0x289b7ec6);   
        HH(d, a, b, c, x[ 0], 11, 0xeaa127fa);   
        HH(c, d, a, b, x[ 3], 16, 0xd4ef3085);   
        HH(b, c, d, a, x[ 6], 23,  0x4881d05);   
        HH(a, b, c, d, x[ 9], 4, 0xd9d4d039);   
        HH(d, a, b, c, x[12], 11, 0xe6db99e5);   
        HH(c, d, a, b, x[15], 16, 0x1fa27cf8);   
        HH(b, c, d, a, x[ 2], 23, 0xc4ac5665);   
      
          
        II(a, b, c, d, x[ 0], 6, 0xf4292244);   
        II(d, a, b, c, x[ 7], 10, 0x432aff97);   
        II(c, d, a, b, x[14], 15, 0xab9423a7);   
        II(b, c, d, a, x[ 5], 21, 0xfc93a039);   
        II(a, b, c, d, x[12], 6, 0x655b59c3);   
        II(d, a, b, c, x[ 3], 10, 0x8f0ccc92);   
        II(c, d, a, b, x[10], 15, 0xffeff47d);   
        II(b, c, d, a, x[ 1], 21, 0x85845dd1);   
        II(a, b, c, d, x[ 8], 6, 0x6fa87e4f);   
        II(d, a, b, c, x[15], 10, 0xfe2ce6e0);   
        II(c, d, a, b, x[ 6], 15, 0xa3014314);
        II(b, c, d, a, x[13], 21, 0x4e0811a1);   
        II(a, b, c, d, x[ 4], 6, 0xf7537e82);
        II(d, a, b, c, x[11], 10, 0xbd3af235);
        II(c, d, a, b, x[ 2], 15, 0x2ad7d2bb);
        II(b, c, d, a, x[ 9], 21, 0xeb86d391);
        state[0] += a;
        state[1] += b;
        state[2] += c;
        state[3] += d;
    } 


void MD5(unsigned char * buf, unsigned int len, unsigned char *out, int type)
{
    int i;
    MD5_CTX md5;
    unsigned char digest[16];

    char hex[]="0123456789abcdef";
    char HEX[]="0123456789ABCDEF";

    MD5Init(&md5);
    MD5Update(&md5, buf,len);
    MD5Final(&md5, digest);

    if (type == 0)
    {
            for (i = 0; i < 16; i++) 
        {
            out[i+i]   = hex[digest[i] >> 4];
            out[i+i+1] = hex[digest[i] & 0x0f];
        }
    }
    else if (type == 1)
    {
        for (i = 0; i < 16; i++) 
        {
            out[i+i]   = HEX[digest[i] >> 4];
            out[i+i+1] = HEX[digest[i] & 0x0f];
        }
    }
    out[i+i] = '\0';
}

测试代码：

#include <stdio.h>
#include "wordpress.h"

int main()
{
	unsigned char passwd[] = "12345678";

	unsigned char salt[] = "12345687";

	unsigned char code[40];

	wordpress(salt, passwd, 8192, code);

	printf("code: %s\n", code);

	return 0;
}

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