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POTripleDES Encrypting in C# and PHP not coming out the same (PKCS7, ECB)?
 

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  1. POTripleDES Encrypting in C# and PHP not coming out the same (PKCS7, ECB)?
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    <p>I've spent a couple hours now trying to figure this out, but I just can't get it to work. I've got a C# encryption routine that I need to match in php. I can't change the C# version, that's not an option (3rd party is firm on this).</p> <p>Here's the C# code:</p> <pre><code>//In C# // Console.WriteLine(ApiEncode("testing", "56dsfkj3kj23asdf83kseegflkj43458afdl")); // Results in: // XvHbR/CsLTo= public static string ApiEncode(string data, string secret) { byte[] clear; var encoding = new UTF8Encoding(); var md5 = new MD5CryptoServiceProvider(); byte[] key = md5.ComputeHash(encoding.GetBytes(secret)); TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider(); des.Key = key; des.Mode = CipherMode.ECB; des.Padding = PaddingMode.PKCS7; byte[] input = encoding.GetBytes(data); try { clear = des.CreateEncryptor().TransformFinalBlock(input, 0, input.Length); } finally { des.Clear(); md5.Clear(); } return Convert.ToBase64String(clear); } </code></pre> <p>Here's the best of what I've come up with in PHP:</p> <pre><code>//In PHP // echo apiEncode("testing", "56dsfkj3kj23asdf83kseegflkj43458afdl"); // Results in: // 5aqvY6q1T54= function apiEncode($data, $secret) { //Generate a key from a hash $key = md5(utf8_encode($secret), true); //Create init vector $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_3DES, MCRYPT_MODE_ecb), MCRYPT_RAND); //Pad for PKCS7 $blockSize = mcrypt_get_block_size('tripledes', 'ecb'); $len = strlen($data); $pad = $blockSize - ($len % $blockSize); $data .= str_repeat(chr($pad), $pad); //Encrypt data $encData = mcrypt_encrypt('tripledes', $key, $data, 'ecb'); //, $iv); return base64_encode($encData); } </code></pre> <p>To the best of my knowledge, I'm handling the PKCS7 padding properly on the PHP side. I'm not sure what else to try.</p> <p>One thing to note, the C# is happening on windows, and the PHP on linux, not sure that should make a difference.</p>
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    1. COcould it be the character encoding thats different - its explicitly utf-8 in c#, but what is it in php? what are the outputs of the md5 call in both languages.
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    2. COPossible duplicate of [tripledes encryption not yielding same results in PHP and C#](http://stackoverflow.com/questions/2467419/tripledes-encryption-not-yielding-same-results-in-php-and-c).
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      1. POTripleDES Encrypting in C# and PHP not coming out the same (PKCS7, ECB)?
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    3. CO@netcoder - Not quite the same answer, so I would say not a duplicate.
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