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POEncryption Algorithm from PHP to Ruby (Vignere variant)
 

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  1. POEncryption Algorithm from PHP to Ruby (Vignere variant)
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    <p>I am a bit stuck with this. I have to interface with an api that uses a version of an encryption algorithm that they seem to have ripped from Typo3 written by Ari Kuorikoski.</p> <p>I need to create a ruby lib to interface with their api, so have to port their algorithm into ruby, and I am a bit out of my depth when it comes to encryption.</p> <p>This is the code:</p> <pre><code>private function keyED($txt) { $encrypt_key = md5($this-&gt;encrypt_key); $ctr=0; $tmp = ""; for ($i=0;$i&lt;strlen($txt);$i++) { if ($ctr==strlen($encrypt_key)) $ctr=0; $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1); $ctr++; } return $tmp; } private function encrypt($txt){ srand((double)microtime()*1000000); $encrypt_key = md5(rand(0,32000)); $ctr=0; $tmp = ""; for ($i=0;$i&lt;strlen($txt);$i++){ if ($ctr==strlen($encrypt_key)) $ctr=0; $tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1)); $ctr++; } return base64_encode($this-&gt;keyED($tmp)); } </code></pre> <p>The part that has me stumped is this, I have to write it for ruby 1.8.6 as that's the server that it will be on. And there's no XOR for strings. Not that I would understand it if there was.</p> <p>Any help, pointers, ideas would be much much appreciated.</p> <p>Addendum:</p> <p>I realize, I didn't put any code up, the only difficulty is actually the xor problem, but here is my code so far:</p> <pre><code>def xor(s1,s2) if s2.empty? then return s1 else a1 = s1.unpack("c*") a2 = s2.unpack("c*") a2 *= 2 while a2.length &lt; a1.length return a1.zip(a2).collect {|c1,c2| c1 ^ c2}.pack("c*") end end def keyED(str) encrypt_key = Digest::MD5.digest(@key) ctr = 0 tmp = '' for i in 0...str.length do ctr = 0 if ctr == encrypt_key.length tmp &lt;&lt; xor(str.slice(i,1), encrypt_key.slice(ctr,1)).to_s ctr = ctr + 1 end return tmp end # === Ported Code # This code was ported from Ari's Typo 3 Session Encryption def encrypt(str) encrypt_key = Digest::MD5.digest(rand(32000).to_s) ctr = 0 tmp = '' for i in 0...str.length do ctr=0 if ctr==encrypt_key.length tmp &lt;&lt; encrypt_key.slice(ctr,1) &lt;&lt; xor(str.slice(i,1), encrypt_key.slice(ctr,1)) ctr = ctr + 1 end return Base64.encode64(keyED(tmp)) end def decrypt(str) txt = keyED(str) tmp = '' for i in 0...txt.length do md = txt.slice(i,1) i = i + 1 tmp &lt;&lt; xor(txt.slice(i,1),md) end puts "Decrypte string:#{Base64.decode64(tmp)}EOSTRING" end </code></pre>
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    1. COOne thing I did find, is that you can get a Fixnum by trying str[i] and encrypt_key[ctr], and perform an xor on those...That didn't work either, but I may have fudged it elsewhere in the code.
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    2. COAs an update, I manages to fix the problem by creating a tokenmaker.php file with the working php functions, and calling it using net/http. I hate doing it this way, but I am on a schedule. I would really really love to find a solution to this problem.
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