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copied!<p>I have come out with <a href="http://itscommonsensestupid.blogspot.com/2009/06/how-to-encrypt-string-in-net-and.html" rel="nofollow noreferrer">a solution in my blog</a>. </p> <p>Here is an excerpt :</p> <pre><code> private static string CreateEncryptedString(string myString, string hexiv, string key) { RijndaelManaged alg = new RijndaelManaged(); alg.Padding = PaddingMode.Zeros; alg.Mode = CipherMode.CBC; alg.BlockSize = 16 * 8; alg.Key = ASCIIEncoding.UTF8.GetBytes(key); alg.IV = StringToByteArray(hexiv); ICryptoTransform encryptor = alg.CreateEncryptor(alg.Key, alg.IV); MemoryStream msStream = new MemoryStream(); CryptoStream mCSWriter = new CryptoStream(msStream, encryptor, CryptoStreamMode.Write); StreamWriter mSWriter = new StreamWriter(mCSWriter); mSWriter.Write(myString); mSWriter.Flush(); mCSWriter.FlushFinalBlock(); var EncryptedByte = new byte[msStream.Length]; msStream.Position = 0; msStream.Read(EncryptedByte, 0, (int)msStream.Length); return ByteArrayToHexString(EncryptedByte); } public static byte[] StringToByteArray(String hex) { int NumberChars = hex.Length; byte[] bytes = new byte[NumberChars / 2]; for (int i = 0; i < NumberChars; i += 2) bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16); return bytes; } public static string ByteArrayToHexString(byte[] ba) { StringBuilder hex = new StringBuilder(ba.Length * 2); foreach (byte b in ba) hex.AppendFormat("{0:x2}", b); return hex.ToString(); } </code></pre> <p>There is one thing to note. The key size must be 16. Which means that key parameter must be a string with 16 characters. Or else the encryption won't work and will throw a CryptographicException.</p> <p>On the PHP end, here's how you do the decoding:</p> <pre><code>$cipher_alg = MCRYPT_RIJNDAEL_128; $decrypted_string = mcrypt_decrypt($cipher_alg, $key, $encrypted_string , MCRYPT_MODE_CBC, trim(hex2bin(trim($hexiv)))); </code></pre>

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