vbs base64 解密脚本代码
作者 佚名
来源 ASP编程
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发布时间 2013-07-09
复制代码 代码如下: Function fDecode(sStringToDecode) ''This function will decode a Base64 encoded string and returns the decoded string. ''This becomes usefull when attempting to hide passwords from prying eyes. Const CharList = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" Dim iDataLength, sOutputString, iGroupInitialCharacter sStringToDecode = Replace(Replace(Replace(sStringToDecode, vbCrLf, ""), vbTab, ""), " ", "") iDataLength = Len(sStringToDecode) If iDataLength Mod 4 <> 0 Then fDecode = "Bad string passed to fDecode() function." Exit Function End If For iGroupInitialCharacter = 1 To iDataLength Step 4 Dim iDataByteCount, iCharacterCounter, sCharacter, iData, iGroup, sPreliminaryOutString iDataByteCount = 3 iGroup = 0 For iCharacterCounter = 0 To 3 sCharacter = Mid(sStringToDecode, iGroupInitialCharacter + iCharacterCounter, 1) If sCharacter = "=" Then iDataByteCount = iDataByteCount - 1 iData = 0 Else iData = InStr(1, CharList, sCharacter, 0) - 1 If iData = -1 Then fDecode = "Bad string passed to fDecode() function." Exit Function End If End If iGroup = 64 * iGroup + iData Next iGroup = Hex(iGroup) iGroup = String(6 - Len(iGroup), "0") & iGroup sPreliminaryOutString = Chr(CByte("&H" & Mid(iGroup, 1, 2))) & Chr(CByte("&H" & Mid(iGroup, 3, 2))) & Chr(CByte("&H" & Mid(iGroup, 5, 2))) sOutputString = sOutputString & Left(sPreliminaryOutString, iDataByteCount) Next fDecode = sOutputString End Function base64 测试代码： 复制代码 代码如下: Function fDecode(sStringToDecode) ''This function will decode a Base64 encoded string and returns the decoded string. ''This becomes usefull when attempting to hide passwords from prying eyes. Const CharList = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" Dim iDataLength, sOutputString, iGroupInitialCharacter sStringToDecode = Replace(Replace(Replace(sStringToDecode, vbCrLf, ""), vbTab, ""), " ", "") iDataLength = Len(sStringToDecode) If iDataLength Mod 4 <> 0 Then fDecode = "Bad string passed to fDecode() function." Exit Function End If For iGroupInitialCharacter = 1 To iDataLength Step 4 Dim iDataByteCount, iCharacterCounter, sCharacter, iData, iGroup, sPreliminaryOutString iDataByteCount = 3 iGroup = 0 For iCharacterCounter = 0 To 3 sCharacter = Mid(sStringToDecode, iGroupInitialCharacter + iCharacterCounter, 1) If sCharacter = "=" Then iDataByteCount = iDataByteCount - 1 iData = 0 Else iData = InStr(1, CharList, sCharacter, 0) - 1 If iData = -1 Then fDecode = "Bad string passed to fDecode() function." Exit Function End If End If iGroup = 64 * iGroup + iData Next iGroup = Hex(iGroup) iGroup = String(6 - Len(iGroup), "0") & iGroup sPreliminaryOutString = Chr(CByte("&H" & Mid(iGroup, 1, 2))) & Chr(CByte("&H" & Mid(iGroup, 3, 2))) & Chr(CByte("&H" & Mid(iGroup, 5, 2))) sOutputString = sOutputString & Left(sPreliminaryOutString, iDataByteCount) Next fDecode = sOutputString End Function msgbox fDecode("d3d3LmpiNTEubmV0") 需要测试加密的代码的朋友可以访问 http://www |
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