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POCrypto++ low level AES API (a la SJCL)
 

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    <p>I'm trying to reverse engineer a protocol from a javascript implementation, and I'm stuck on an AES encryption method. I'm programming this in C++, with the Crypto++ library. It's using the SJCL library, and it calls <code>ciphertext = (new sjcl.cipher.aes(key)).encrypt(plaintext)</code>. From the SJCL documentation, I can see that this is a low-level interface. <code>ciphertext</code>, <code>key</code>, and <code>plaintext</code> are all 4-element arrays of 32-bit integers. As far as I know, and could find on google, Crypto++ only provides high-level interfaces. Is there any way to get Crypto++ to do what SJCL is doing? Also, what exactly does that <code>encrypt</code> method do?</p> <p><a href="http://bitwiseshiftleft.github.com/sjcl/doc/symbols/sjcl.cipher.aes.html" rel="nofollow">http://bitwiseshiftleft.github.com/sjcl/doc/symbols/sjcl.cipher.aes.html</a></p> <p>Edit: I noticed the javascript code converted <code>plantext</code> from a string to ints, and I think I tried every combination of changing endianess of every variable. I tried all combinations that made sense, anyway. I also tried creating arrays of <code>int32_t</code>'s and initializing them with what was input into that line of javascript. Here's what I've got now:</p> <pre><code>void crypto() { SecByteBlock key(16); int32_t plain[4] = { 0x93C467E3, 0x7DB0C7A4, 0xD1BE3F81, 0x0152CB56 }, cipher[4]; int32_t* keyBuf = (int32_t*) key.BytePtr(); keyBuf[0] = 1885434739; keyBuf[1] = 2003792484; keyBuf[2] = 0; keyBuf[3] = 0; cout &lt;&lt; "plain = [" &lt;&lt; plain[0] &lt;&lt; ", " &lt;&lt; plain[1] &lt;&lt; ", " &lt;&lt; plain[2] &lt;&lt; ", " &lt;&lt; plain[3] &lt;&lt; "]\n"; cout &lt;&lt; "key = [" &lt;&lt; keyBuf[0] &lt;&lt; ", " &lt;&lt; keyBuf[1] &lt;&lt; ", " &lt;&lt; keyBuf[2] &lt;&lt; ", " &lt;&lt; keyBuf[3] &lt;&lt; "]\n"; ECB_Mode&lt;AES&gt;::Encryption e; e.SetKey(key, key.size()); StringSource((const byte*) plain, 16, true, new StreamTransformationFilter( e, new ArraySink((byte*)cipher, 16) ) ); cout &lt;&lt; "cipher = [" &lt;&lt; cipher[0] &lt;&lt; ", " &lt;&lt; cipher[1] &lt;&lt; ", " &lt;&lt; cipher[2] &lt;&lt; ", " &lt;&lt; cipher[3] &lt;&lt; "]\n"; } function crypto() { var key = [1885434739, 2003792484, 1885434739, 2003792484]; var plain = [0x93C467E3,0x7DB0C7A4,0xD1BE3F81,0x0152CB56]; console.log("plain = "+plain); console.log("key = "+key); var cipher = (new sjcl.cipher.aes(key)).encrypt(plain); console.log("cipher = "+cipher); } </code></pre> <p>Here's the output of the C++ version:</p> <pre><code>plain = [2479122403, 2108737444, 3518906241, 22203222] key = [1885434739, 2003792484, 1885434739, 2003792484] cipher = [3437909595, 1341853431, 2532744872, 2416113380] </code></pre> <p>and JavaScript:</p> <pre><code>plain = 2479122403,2108737444,3518906241,22203222 key = 1885434739,2003792484,1885434739,2003792484 cipher = -1974659585,-1567997661,-1863224381,-318378846 </code></pre>
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