将 VB6 代码转换为 PHP

Question

我想将Visual Basic 6代码转换为PHP代码。我是PHP的新手，请帮助我将VB6代码转换为PHP。到目前为止，当我尝试代码时，我试图将其转换为php代码

，" CryptRC4

= CryptRC4 & Chr$((pvCryptXor(baS((CLng(baS(li(( + baS(lJ(( Mod 256(， Asc(Mid$(sText， lIdx， 1(((((;

部分，我也不知道如何继续子功能。请参阅下面的代码。vb 代码用于encrypt字符串。我想将其转换为 php 格式。

PHP代码

<?php 
function CryptRC4($sText,$sKey){
$baS = array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255);
$baK = array(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255);
$bytSwap = 0;
$li = 0;
$lJ = 0;
$lIdx = 0;
for( $lIdx = 0; $lIdx < 256; $lIdx++){
$baS[$lIdx] = $lIdx;
$baK[$lIdx] = ord(substr($sKey, 1 + ($lIdx % strlen($sKey)), 1));   
}
for($li = 0; $li < 256; $li++){
$lJ = ($baS[$li] + $baK[$li]) % 256;
$bytSwap = $baS[$li];
$baS[$li] = $baS[$lJ];
$baS[$lJ] = $bytSwap;
}
$li = 0;
$lJ = 0;
$data_str = "";
for($lIdx = 0; $lIdx < strlen($sText); $lIdx++){
$li = ($li + 1) % 256;
$lJ = ($lJ + $baS[$li]) % 256;
$bytSwap = $baS[$li];
$baS[$li] = $baS[$lJ];
$baS[$lJ] = $bytSwap;
#echo chr((pvCryptXor($baS[(round(($baS[$li]) + $baS[$lJ])) % 256], ord(substr($sText, $lIdx, 1)))));
$data_str .= chr((pvCryptXor($baS[(round(($baS[$li]) + $baS[$lJ])) % 256], ord(substr($sText, $lIdx, 1)))));
}   
echo $data_str;
}

function pvCryptXor($li, $lJ){
if($li = $lJ){
$pcx = $lJ;
}
else {
$pcx = $li Xor $lJ;
}
return $pcx;
}
unction ToHexDump($sText) {
$lIdx;
for($lIdx = 1; $lIdx < strlen($sText); $lIdx++){
$thd .= Right$("0" & Hex(Asc(Mid(sText, lIdx, 1))), 2)
echo $thd;
}
return $thd;
}
FromHexDump("events");
function FromHexDump($sText) {
$fhd = "";
for($lIdx = 0; $lIdx < strlen($sText); $lIdx++){
$fhd .= chr(CLng("&H" & Mid(sText, lIdx, 2)));
}
return $fhd;
}
?>

VB代码：

Public Function CryptRC4(sText As String, sKey As String) As String
On Error Resume Next
Dim baS(0 To 255) As Byte
Dim baK(0 To 255) As Byte
Dim bytSwap     As Byte
Dim li          As Long
Dim lJ          As Long
Dim lIdx        As Long
For lIdx = 0 To 255
baS(lIdx) = lIdx
baK(lIdx) = Asc(Mid$(sKey, 1 + (lIdx Mod Len(sKey)), 1))
Next
For li = 0 To 255
lJ = (lJ + baS(li) + baK(li)) Mod 256
bytSwap = baS(li)
baS(li) = baS(lJ)
baS(lJ) = bytSwap
Next
li = 0
lJ = 0
For lIdx = 1 To Len(sText)
li = (li + 1) Mod 256
lJ = (lJ + baS(li)) Mod 256
bytSwap = baS(li)
baS(li) = baS(lJ)
baS(lJ) = bytSwap
CryptRC4 = CryptRC4 & Chr$((pvCryptXor(baS((CLng(baS(li)) + baS(lJ)) Mod 256), Asc(Mid$(sText, lIdx, 1)))))
Next
End Function
Private Function pvCryptXor(ByVal li As Long, ByVal lJ As Long) As Long
On Error Resume Next
If li = lJ Then
pvCryptXor = lJ
Else
pvCryptXor = li Xor lJ
End If
End Function
Public Function ToHexDump(sText As String) As String
On Error Resume Next
Dim lIdx            As Long
For lIdx = 1 To Len(sText)
ToHexDump = ToHexDump & Right$("0" & Hex(Asc(Mid(sText, lIdx, 1))), 2)
Next
End Function
Public Function FromHexDump(sText As String) As String
On Error Resume Next
Dim lIdx            As Long
For lIdx = 1 To Len(sText) Step 2
FromHexDump = FromHexDump & Chr$(CLng("&H" & Mid(sText, lIdx, 2)))
Next
End Function

Answer 1

我修改了您更新的代码，似乎您只有一些小错误，外观和我的更改：

我想您可以使用 PHP 函数hex2bin和bin2hex中的构建来代替您自己的十六进制转换。

function CryptRC4($sText,$sKey){
$baS = range(0, 255); // you can use range instead of your manual arrays
$baK = range(0, 255);
$bytSwap = 0;
$li = 0;
$lJ = 0;
$lIdx = 0;
for( $lIdx = 0; $lIdx < 256; $lIdx++){
$baS[$lIdx] = $lIdx;
$baK[$lIdx] = ord(substr($sKey, 1 + ($lIdx % strlen($sKey)), 1));
}
for($li = 0; $li < 256; $li++){
$lJ = ($baS[$li] + $baK[$li]) % 256;
$bytSwap = $baS[$li];
$baS[$li] = $baS[$lJ];
$baS[$lJ] = $bytSwap;
}
$li = 0;
$lJ = 0;
$data_str = "";
for($lIdx = 0; $lIdx < strlen($sText); $lIdx++){
$li = ($li + 1) % 256;
$lJ = ($lJ + $baS[$li]) % 256;
$bytSwap = $baS[$li];
$baS[$li] = $baS[$lJ];
$baS[$lJ] = $bytSwap;
#echo chr((pvCryptXor($baS[(round(($baS[$li]) + $baS[$lJ])) % 256], ord(substr($sText, $lIdx, 1)))));
$data_str .= chr((pvCryptXor($baS[(round(($baS[$li]) + $baS[$lJ])) % 256], ord(substr($sText, $lIdx, 1)))));
}
return $data_str; // changed from echo to return
}
function pvCryptXor($li, $lJ){
if($li == $lJ){ // you had an error here, use == to compare instead of a single =
$pcx = $lJ;
}
else {
$pcx = $li ^ $lJ; // XOR function in PHP is the ^ operator
}
return $pcx;
}

$str_hex = bin2hex("events");
$str_enc = CryptRC4($str_hex,"password");
$str_dec = hex2bin(CryptRC4($str_enc,"password"));
echo $str_hex . PHP_EOL . $str_enc . PHP_EOL . $str_dec;

输出：

6576656e7473

' ~i

事件

所以在我看来，它实际上是正确编码和解码！？

Answer 2

似乎CryptRC4函数的原始 VB6 实现来自我对 SO 上的"VB6 使用密码加密文本"问题的回答。

因此，让我尝试用 VB6 代码片段中所有公共函数的简短php实现来回答您的问题：

function CryptRC4($text, $key) {
return openssl_encrypt($text, "RC4-40", $key, 1 | 2);
}
function ToHexDump($text) {
return strtoupper(bin2hex($text));
}
function FromHexDump($text) {
return hex2bin($text);
}

您可以使用如下所示的内容来练习这些单行代码：

$text = "a message here";
$password = "password";
$encr = ToHexDump(CryptRC4($text, $password));
$decr = CryptRC4(FromHexDump($encr), $password);
echo $text . PHP_EOL . $encr . PHP_EOL . $decr;

Answer 3

由于它是用于密码的，因此您可以省去很多麻烦。PHP 内置了函数(版本 5.5 及更高版本(，这些函数旨在处理密码的哈希处理以及根据用户提交的密码验证哈希密码。通读 PHP 相关的 PHP 手册页 http://php.net/manual/en/book.password.php