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POGetting SlowAES and RijndaelManaged class in .NET to play together
 

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    <p>I'm trying to setup AES encryption / decryption using the javascript library <a href="http://code.google.com/p/slowaes/" rel="nofollow noreferrer">SlowAES</a> and the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndaelmanaged.aspx" rel="nofollow noreferrer">RijndaelManaged</a> class in .NET.</p> <p>I chose this method after reading <a href="https://stackoverflow.com/questions/270510/how-to-encrypt-in-vbscript-using-aes/">this post</a>, where Cheeso has managed to get these two encryption methods to play together </p> <blockquote> <p>"In my tests of the COM-wrapped-SlowAEs, I used CBC mode, and the encryption was completely compatible with the RijndaelManaged class in .NET" - Cheeso</p> </blockquote> <p>I've taken the javascript code from Cheeso's Windows Scripting Component, the latest slowaes libraries, and using the following javascript script to test:</p> <pre><code>var key = "12345678901234567890123456789012"; var message = "watson?"; var decrypted; slowAES.aes.keySize.SIZE_256; slowAES.modeOfOperation.CBC; put_PassPhrase(key); var result = EncryptString(message); decrypted = DecryptCommaDelimitedStringToString(result) document.write("Key:" + key + "&lt;br /&gt;original:" + message + "&lt;br /&gt;Cypher:" + result + "&lt;br /&gt;Decrypted:" + decrypted + "&lt;br /&gt;IV(): " + get_IV()); </code></pre> <p>I'm getting the following output:</p> <pre><code>Key:12345678901234567890123456789012 original:watson? Cypher:245,159,1,1,168,1,1,143,1,1,146,1,1,239,117,1 Decrypted:watson? IV(): 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 </code></pre> <p>I've modified the following example found <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndaelmanaged.aspx" rel="nofollow noreferrer">on MSDN</a> to try and match the encryption in C# :</p> <pre><code>public static void Main() { try { string original = "watson?"; byte[] IV = new byte[16]; // match slowaes IV byte[] key = new System.Text.ASCIIEncoding().GetBytes("12345678901234567890123456789012");// match slowaes KEY RijndaelManaged myRijndael = new RijndaelManaged(); myRijndael.BlockSize = 128; myRijndael.KeySize = 256; myRijndael.Mode = CipherMode.CBC; // Encrypt the string to an array of bytes. byte[] encrypted = encryptStringToBytes_AES(original, key, IV); // Decrypt the bytes to a string. string roundtrip = decryptStringFromBytes_AES(encrypted, key, IV); //Display the original data and the decrypted data. Console.WriteLine("Original: {0}", original); Console.WriteLine("Round Trip: {0}", roundtrip); } catch (Exception e) { Console.WriteLine("Error: {0}", e.Message); } } </code></pre> <p>Watch of the byte array:</p> <pre><code>- encrypted {byte[16]} byte[] [0] 139 byte [1] 104 byte [2] 166 byte [3] 35 byte [4] 8 byte [5] 42 byte [6] 216 byte [7] 160 byte [8] 235 byte [9] 153 byte [10] 23 byte [11] 143 byte [12] 105 byte [13] 3 byte [14] 24 byte [15] 255 byte </code></pre> <p>I've tried all the padding options with the managed .NET class, however I can't get the encrypted outputs to match. Can anyone help me?</p> <p>Thanks,</p> <p>Bob</p>
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