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POc# shorten query string parameter
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copied!<p>I need to pass a URL as a parameter into my querystring, since the URLs can be long I need to shorten the URL while passing and then be able to decrypt them on server side.</p> <p>The URL that I am trying to pass does <strong>not</strong> contain sensitive information so string encryption techniques are not required, I am just looking to convert a long string to a short string and be able to reconstruct it back to a string.</p> <p>I have tried AES encryption and it works but the resulting string is sometimes longer than the URL value itself.</p> <p>Example of what I've tried so far :</p> <pre><code>private static byte[] key = { 252, 217, 19, 11, 24, 26, 85, 45, 114, 184, 27, 162, 37, 112, 222, 209, 241, 24, 175, 144, 173, 53, 196, 29, 24, 26, 17, 218, 131, 236, 53, 209 }; private static byte[] vector = { 152, 64, 191, 111, 23, 3, 113, 119, 231, 121, 221, 112, 79, 32, 114, 156 }; private ICryptoTransform encryptor, decryptor; private UTF8Encoding encoder; public SimpleAES() { RijndaelManaged rm = new RijndaelManaged(); encryptor = rm.CreateEncryptor(key, vector); decryptor = rm.CreateDecryptor(key, vector); encoder = new UTF8Encoding(); } public string Encrypt(string unencrypted) { return Convert.ToBase64String(Encrypt(encoder.GetBytes(unencrypted))); } public string Decrypt(string encrypted) { return encoder.GetString(Decrypt(Convert.FromBase64String(encrypted))); } public string EncryptToUrl(string unencrypted) { return HttpUtility.UrlEncode(Encrypt(unencrypted)); } public string DecryptFromUrl(string encrypted) { return Decrypt(HttpUtility.UrlDecode(encrypted)); } public byte[] Encrypt(byte[] buffer) { return Transform(buffer, encryptor); } public byte[] Decrypt(byte[] buffer) { return Transform(buffer, decryptor); } protected byte[] Transform(byte[] buffer, ICryptoTransform transform) { MemoryStream stream = new MemoryStream(); using (CryptoStream cs = new CryptoStream(stream, transform, CryptoStreamMode.Write)) { cs.Write(buffer, 0, buffer.Length); } return stream.ToArray(); } </code></pre> <p>Example TEST :</p> <pre><code>string unencrypted = "/exampleurl/this_is_a_long_string_the_length_of_this_url_is_112_charachters_/this_string_needs_to_be-shortened/"; var result = EncryptToUrl(unencrypted); "MHMyQdwbJpw8ah%2fbhAr2eJwTFa%2fyupemjuOVcBJmxTIdzcR0PZKCNSa5Fvi7kNrY3Kxlk5KWqAAEspWVtJfNjwwPs%2bCDGpC9Fn8CeGezWhXEbLT6CST2v%2fKpvptHVi3fBYSk1w3q1FYMx3C5DdKueQ%3d%3d" </code></pre> <p>The actual string is 112 charachters long and the result is 165 charahcters long.</p>

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