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PODecrypt WEP wlan profile key using CryptUnprotectData
 

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    <p>I am trying to decrypt WEP profile's key using <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa380882%28v=vs.85%29.aspx">CryptUnprotectData</a>. The way I fetched the profile key is by exporting the profile using netsh.</p> <pre><code>netsh wlan export profile name="MyWEP" folder="./" </code></pre> <p>For now, I manually copied the key material from the .xml file generated by the netsh command to my program. And the way, I am decrypting is -</p> <pre><code>DATA_BLOB DataOut, DataVerify; DataOut.cbData = encryptData.length(); DataOut.pbData = (BYTE*)("I_Manually_Copy_The_WEP_Key_Here"); if (CryptUnprotectData( &amp;DataOut, NULL, NULL, NULL, NULL, 0, &amp;DataVerify)) { printf("The decrypted data is: %s\n", DataVerify.pbData); } else { printf("Failed. Error Code: %d", GetLastError()); } </code></pre> <p>But I am getting the error code <strong>13</strong> citing Invalid Data. What am I doing wrong ? On Win 7 and later, I can directly use <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms706738%28v=vs.85%29.aspx">WlanGetProfile</a> with the parameter <strong>WLAN_PROFILE_GET_PLAINTEXT_KEY</strong> . But I have <strong>NO</strong> option on <strong>Vista</strong> than to use the CryptUnprotectData function. I have seen similar posts <a href="http://social.msdn.microsoft.com/Forums/en/vistawirelesssdk/thread/ad10453a-68a8-4f69-bcc8-76aeae9085f7">here</a>, <a href="http://social.msdn.microsoft.com/Forums/en-US/vbgeneral/thread/7815b530-65e7-4404-888a-02d929439094/">here</a> but didn't get much useful information. Also, I am using the same system with same user log on credentials. Could any one please suggest me how to proceed ?</p> <p>PS: I have posted the same question on Windows Desktop SDK forums, but haven't got response yet. Trying my luck on SO.</p>
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