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POc# Sagepay XOR encryption
 

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  1. POc# Sagepay XOR encryption
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    <p>I am trying to write the xor encryption in C# as sagepay encryption is only documented in VB.</p> <p>the vb code is:</p> <pre><code>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 &lt;= Len(strIn) strReturn = strReturn &amp; 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 </code></pre> <p>So far I have converted this to </p> <pre><code> public static String SimpleXOR(String strIn, String strKey) { Int32 iInIndex, iKeyIndex; String strReturn; iInIndex = 1; iKeyIndex = 1; strReturn = ""; while (iInIndex &lt;= strIn.Length) { strReturn = strReturn &amp; 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; } } </code></pre> <p>The problem is I didn't understand what this line is doing</p> <pre><code>strReturn = strReturn &amp; Chr(Asc(Mid(strIn, iInIndex, 1)) Xor Asc(Mid(strKey, iKeyIndex, 1))) </code></pre> <p>so I ran it through a vb to c# converter and got the above. But it clearly is not valid c# code as far as I am aware.</p> <p>Can anyone help?</p>
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    1. USjimmy
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    1. COIf your payment processor invents its own encryption, I would not touch it with a ten foot pole.
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      1. USSLaks
    2. CO@SLaks SagePay is kind of a biggie.
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      1. USJon B
 

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