c＃Sagepay XOR加密

Question

我想在C＃中编写xor加密，因为sagepay加密仅在VB中记录。

VB代码是：

Public Shared Function simpleXor(ByVal strIn As String, ByVal strKey As String) As String 
    Dim iInIndex As Integer 
    Dim iKeyIndex As Integer 
    Dim strReturn As String 
    If Len(strIn) = 0 Or Len(strKey) = 0 Then 
     simpleXor = "" 
     Exit Function 
    End If 

    iInIndex = 1 
    iKeyIndex = 1 
    strReturn = "" 

    '** Step through the plain text source XORing the character at each point with the next character in the key ** 
    '** Loop through the key characters as necessary ** 
    Do While iInIndex <= Len(strIn) 
     strReturn = strReturn & Chr(Asc(Mid(strIn, iInIndex, 1)) Xor Asc(Mid(strKey, iKeyIndex, 1))) 
     iInIndex = iInIndex + 1 
     If iKeyIndex = Len(strKey) Then iKeyIndex = 0 
     iKeyIndex = iKeyIndex + 1 
    Loop 

    simpleXor = strReturn 
End Function 

到目前为止，我已经转换这

 public static String SimpleXOR(String strIn, String strKey) 
    { 
     Int32 iInIndex, iKeyIndex; 
     String strReturn; 
     iInIndex = 1; 
     iKeyIndex = 1; 
     strReturn = ""; 

     while (iInIndex <= strIn.Length) 
     { 
      strReturn = strReturn & Strings.Chr(Strings.Asc(Strings.Mid(strIn, iInIndex, 1))^Strings.Asc(Strings.Mid(strKey, iKeyIndex, 1))); 
       iInIndex = iInIndex + 1; 
      if (iKeyIndex == strKey.Length) iKeyIndex = 0; 
      iKeyIndex = iKeyIndex + 1; 

     } 

    } 

问题是我不明白这行做

strReturn = strReturn & Chr(Asc(Mid(strIn, iInIndex, 1)) Xor Asc(Mid(strKey, iKeyIndex, 1))) 

所以我运行它通过一个vb到C＃转换器，并得到了上述。但据我所知，这显然不是有效的C＃代码。

任何人都可以帮忙吗？

Answer 1

有两种方法我能想到的要做到这一点：

首先，抓住当前System.Globalization.CultureInfo.CurrentCulture.TextInfo.ANSICodePage线程，传递到使用GetEncoding方法的新的编码类的实例，然后用编码实例的GetBytes方法将字符串转换为字节数组

public static string SimpleXOR(string strIn, string strKey) 
    { 
     if (strIn.Length == 0 || strKey.Length == 0) 
     { 
      return string.Empty; 
     } 

     int inIndex = 0; 
     int keyIndex = 0; 
     string returnString = string.Empty; 

     var currentCodePage = System.Globalization.CultureInfo.CurrentCulture.TextInfo.ANSICodePage; 
     var encoding = Encoding.GetEncoding(currentCodePage); 

     var inString = encoding.GetBytes(strIn); 
     var keyString = encoding.GetBytes(strKey); 

     while (inIndex < inString.Length) 
     { 
      returnString += (char)(inString[inIndex]^keyString[keyIndex]); 

      inIndex++; 

      if (keyIndex == keyString.Length - 1) 
      { 
       keyIndex = 0; 
      } 
      else 
      { 
       keyIndex++; 
      } 
     } 

     return returnString; 
    } 

另一种更简单的方法是在C＃项目中添加对Microsoft.VisualBasic的引用，并让转换器生成代码。字符串类将是可用的，使您可以执行Strings.Chr，Strings.Asc和Strings.Mid。

Answer 2

在C＃中，这将仅仅是

strReturn += (char)(strIn[iInIndex] ^strKey[iKeyIndex]);