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Home Backend Development PHP Tutorial PHP加密算法转换delphi出问题

PHP加密算法转换delphi出问题

Jun 20, 2016 pm 12:42 PM

 function encrypt($string,$operation,$key='')    {        $key=md5($key);        $key_length=strlen($key);        $string=$operation=='D'?base64_decode($string):substr(md5($string.$key),0,8).$string;        $string_length=strlen($string);        $rndkey=$box=array();        $result='';        for($i=0;$i<=255;$i++)        {            $rndkey[$i]=ord($key[$i%$key_length]);            $box[$i]=$i;        }        for($j=$i=0;$i<256;$i++)        {            $j=($j+$box[$i]+$rndkey[$i])%256;            $tmp=$box[$i];            $box[$i]=$box[$j];            $box[$j]=$tmp;        }        for($a=$j=$i=0;$i<$string_length;$i++)        {            $a=($a+1)%256;            $j=($j+$box[$a])%256;            $tmp=$box[$a];            $box[$a]=$box[$j];            $box[$j]=$tmp;            $result.=chr(ord($string[$i])^($box[($box[$a]+$box[$j])%256]));        }        if($operation=='D')        {            if(substr($result,0,8)==substr(md5(substr($result,8).$key),0,8))            {                return substr($result,8);            }            else            {                return'';            }        }        else        {            return str_replace('=','',base64_encode($result));        }    }$id = '123sdfsdf';$key = 'aasd1234567985fdgdfdfgdg';$token = encrypt($id, 'E', $key);echo '加密:'.encrypt($id, 'E', $key);echo '<br />';echo '解密:'.encrypt($token, 'D', $key);
Copy after login



function encrypt(str, operation, key: string): string;  function StrToMD5(s: string): string;  var    Md5Encode: TIdHashMessageDigest5;  begin         Md5Encode := TIdHashMessageDigest5.Create;    Result := Md5Encode.AsHex(Md5Encode.HashValue(S));    Md5Encode.Free;       end;var  key_length: Integer;  string_length: Integer;  I, j, A: Integer;  rndkey: array[0..255] of Byte;  Box: array[0..255] of Byte;  tmp: Byte;begin  key := LowerCase(StrToMD5(key));  key_length := Length(key);  if operation = 'D' then    str := DecodeString(str)  else    str := Copy(lowerCase(StrToMD5(str + key)), 1, 8) + str;  string_length := Length(str);  result := '';  for i := 0 to 255 do  begin    rndkey[i] := ord(key[(i mod key_length) + 1]);    Box[i] := i;  end;  j := 0;  for i := 0 to 255 do  begin    j := (j + Box[i] + rndkey[i]) mod 256;    tmp := Box[i];    Box[i] := Box[j];    Box[j] := tmp;  end;  a := 0;  j := 0;  for i := 1 to string_length do  begin    A := (A + 1) mod 256;    j := (j + Box[A]) mod 256;    tmp := Box[A];    Box[A] := Box[j];    Box[j] := tmp;    result := result + chr(ord(str[i]) xor (Box[(Box[A] + Box[j]) mod 256]));  end;  if (operation = 'D') then  begin      if (copy(result, 1, 8) = copy(lowerCase(StrToMd5(copy(result, 9, Length(Result) - 8) + key)), 1, 8)) then    begin      Result := copy(result, 9, Length(Result) - 8);    end    else    begin      Result := '';    end;  end  else  begin    Result := StringReplace(EncodeString(result), '=', '', [rfReplaceAll]);  end; end;
Copy after login

自己网上找的PHP加密算法,但是转成DELPHI 时候只有加密正确 解密不正确
求前辈帮忙完美转换


回复讨论(解决方案)

这个完全没什么技术难度,你只是不会调试而已。
既然能把代码转过去了,哪行对应哪行就清楚了
取一行php输出一下变量,delphi输出一下变量,如果变量值有不同就是这行错了。
程序就在那里慢慢查肯定能查出是哪行错了,实在不行一行行对比也行啊。
 所以找到问题只是时间问题,这个完全没有难度只是费时费力而已。

你这个是什么加密算法?

delphi 的 DecodeString 是对应 php 的 base64_decode 吗?
那么 DecodeString 函数是残废的 base64 串是如何处理的?
建议你补齐尾部的 =

这个完全没什么技术难度,你只是不会调试而已。
既然能把代码转过去了,哪行对应哪行就清楚了
取一行php输出一下变量,delphi输出一下变量,如果变量值有不同就是这行错了。
程序就在那里慢慢查肯定能查出是哪行错了,实在不行一行行对比也行啊。
 所以找到问题只是时间问题,这个完全没有难度只是费时费力而已。


调试过了 DecodeString 后解密出来的字符串 delphi 比 php 少了2位

delphi 的 DecodeString 是对应 php 的 base64_decode 吗?
那么 DecodeString 函数是残废的 base64 串是如何处理的?
建议你补齐尾部的 =



我试试吧后尾补=看看,

delphi 的 DecodeString 是对应 php 的 base64_decode 吗?
那么 DecodeString 函数是残废的 base64 串是如何处理的?
建议你补齐尾部的 =


补齐尾部的=也不行,现在发现DecodeString解密出来的字符出错了

按你给出的参数,$token 尾部有一个 = 被删去
这与你 delphi 比 php 少了2位 的说法是吻合的
base64 将 3 个字解扩展成 4 个字节 ,尾部的 2 个字符扩展后需用 = 补齐
解码时如果因残废了而舍弃,就正好少了2个字符

你怎么补的?贴出代码




按你给出的参数,$token 尾部有一个 = 被删去
这与你 delphi 比 php 少了2位 的说法是吻合的
base64 将 3 个字解扩展成 4 个字节 ,尾部的 2 个字符扩展后需用 = 补齐
解码时如果因残废了而舍弃,就正好少了2个字符



按照你的方法我的delphi 版后面加了 = 
然后解密出来 字符再转成 Asc码比对了下delphi 和 PHP 分别为
delphi 版
1571920612038416510212118647183621641859132545612373206113391
php 版
157192061203841651021211864718362164185913254561237320611339
后面少了个1

  if operation = 'D' then
     在这里给 str 加上 (4 - Length(str)%4)%4 个 =
    str := DecodeString(str)
  else

或者你看看
DecodeString("YWI=")

DecodeString("YWI")
的结果分别是什么

  if operation = 'D' then
     在这里给 str 加上 (4 - Length(str)%4)%4 个 =
    str := DecodeString(str)
  else



按照你的方法可以了,原来要补齐4的整数=谢谢版主
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