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POEncrypting on PHP but can't decrypt on C#
 

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  1. POEncrypting on PHP but can't decrypt on C#
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    <p>I have a test.php with the following: <pre><code>echo encrypt("something"); function encrypt($str) { $enc_key = "my key is 8 char long"; $ivArray=array( 0x10, 0x12, 5, 0x11, 0x23, 1, 0x55, 0x43 ); $iv=null; foreach ($ivArray as $element) $iv.=CHR($element); return strtoupper(bin2hex(base64_encode(mcrypt_encrypt(MCRYPT_DES, $enc_key, $str, MCRYPT_MODE_CBC, $iv)))); } </code></pre> <hr> <p>Then on my C# code I have:</p> <pre><code>private static byte[] iv = new byte[] { 0x10, 0x12, 5, 0x11, 0x23, 1, 0x55, 0x43 }; public string ConvertString(string input, string myKey) { try { input = byteArrayString(input); byte[] bytes = Encoding.UTF8.GetBytes(myKey); byte[] buffer = Convert.FromBase64String(input); DESCryptoServiceProvider provider = new DESCryptoServiceProvider(); MemoryStream stream = new MemoryStream(); CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(bytes, iv), CryptoStreamMode.Write); stream2.Write(buffer, 0, buffer.Length); stream2.FlushFinalBlock(); return Encoding.UTF8.GetString(stream.ToArray()); } catch { return string.Empty; } } private string byteArrayString(string input) { byte[] buffer = new byte[input.Length / 2]; for (int i = 0; i &lt; input.Length; i += 2) { if (i &lt; input.Length) { buffer[i / 2] = (byte)((Uri.FromHex(input[i]) * 0x10) + Uri.FromHex(input[i + 1])); } } return Encoding.UTF8.GetString(buffer); } </code></pre> <hr> <p>If I do it all on C# it works the difference from the PHP to the C# is 12 bytes on the resulting encryption from the PHP.</p> <p><strong>What am I doing wrong at the PHP side to match the encryption ?</strong></p> <hr> <p>Update (PKCS7):</p> <pre><code>$block = mcrypt_get_block_size('des', 'cbc'); $len = strlen($str); $padding = $block - ($len % $block); $str .= str_repeat(chr($padding),$padding); </code></pre>
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    1. COMost likely caused by different padding.
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    2. CO@CodesInChaos yes but which padding should I be using PKCS7 ? if so I have tried it as well.
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    3. COBtw. this code is obviously not secure. DES takes a 56 bit key, and is thus easy to brute-force. A constant isn't a proper IV, it's missing authentication,...
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      1. POEncrypting on PHP but can't decrypt on C#
      1. USCodesInChaos
 

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