md5可逆反，这样的程序代码你看看

[shine_yzl]

$rkey = $s; //取机器码
$sn = $snn; //序列号
$skey = $s1; //激活码
$ma = $gSkey[2]; //取ma 无意义
//print "04 ".$ma." <BR>";
$ma = split( "\\[\\]", $ma ); //修改ma
//print "05 ".$ma." <BR>";
$ma = base64_decode( $ma[2] ); //修改ma 为最后8个字符作用
print "机器信息：".$ma." <BR>";
$skey = strtolower( $s1 ); //激活码小写
$sn = strtolower( $sn ); //序列号小写
$rkey = strtolower( $rkey ); //取机器码小写
print "激活码小写：".$rkey." <BR>";
print "序列号小写：".$sn." <BR>";
print "取机器码小写：".$skey." <BR>";
$mkey = strtolower( substr( $skey, 8, 16 ) ); //激活码的8-16位字符为mkey
print "激活码的8-16位字符为：".$mkey." <BR>";
$r1 = md5( $mkey ); //mkey 处理1 MD5--r1
$r1 = base64_encode( $sn.$r1 ); //mkey 处理2 sn encode --r1
$r1 = md5( $r1 ); //md5 --r1
print "r1字符为：".$r1." <BR>";
$r2 = base64_encode( $sn.$mkey ); //mkey sn encode --r2
$r2 = md5( $r2 ); //md5 --r2
print "r2字符为：".$r2." <BR>";
$r3 = md5( md5( base64_encode( $sn ) ).md5( base64_encode( $mkey ) ) ); //md5 md5 sn,mkey--r3
print "r3字符为：".$r3." <BR>";
$rr = "01234567890123456789012345678901"; //rr-字符
$a = 0;
for ( ; $a < 32; ++$a )
{
$b1 = hexdec( $r1[$a] );
$b2 = hexdec( $r2[$a] );
$b3 = hexdec( $r3[$a] );
$b = dechex( ( $b1 + $b2 + $b3 ) % 16 );
$rr[$a] = $b;
}
$rr = strtolower( substr( $rr, 8, 16 ) );
print "rr字符为：".$rr." <BR>";
$hhbz = 0;
$kk = $rkey; //取机器码已经小写
$LL = substr( $kk, 0, 8 ); //取机器码0-7 --LL
$RR = substr( $kk, 8, 24 ); //取机器码8-16 --RR
//主要对比是这块，怎么就让前8个字符与后24个字符MD5就可以
print "kk字符为：".$kk." <BR>";
print "对比字符为：".substr( md5( $RR ), 0, 8 ) ." <BR>";
print "LL字符为：".$LL." <BR>";
print "RR字符为：".$RR." <BR>";
if ( $LL != substr( md5( $RR ), 0, 8 ) ) //LL <> rr(0-8) MD5 比较
{
$hhbz = 1;
}
print "对比字符为：".substr( $rkey, 8, 16 )." <BR>";
print "rr字符为：".$rr." <BR>";
if ( substr( $rkey, 8, 16 ) != $rr ) //rkey 8-16 rr 8-16 比较
{
$hhbz = 1;
}

[xuzuning]

胡说八道

[fl49809045]

.......

[satanzhf]

md5是不可逆的·····

[iwantnet]

如果md5可逆，那你这贴子可发错地方了。

[骄傲青蛙]

代码实践过？？

[jlzan1314]

[Quote=引用 5 楼 iwantnet 的回复:]
如果md5可逆，那你这贴子可发错地方了。


[/Quote]有道理

[ltx851201]

md5加密的是不可逆的，所以，楼主应该是发错地方啦；

[dld11111]

吓我一跳，赶紧进来看看