Superyeti420's Blog

Hey everyone, while working on my latest project, i discovered the need to search the address book for a phone number. Through my travels, I DID discover that it seems this functionality isn’t exposed by default with the native iOS libraries, or if it is, its with NSArrays, and NSObjects which can be slower than native MT components. So with a bit of help from Clancy, i came up with this helper class for the MonoTouch ABAddressBook. Enjoy.


public class ContactHelper
{
public ContactHelper ()
{

}


hey guys, today FAK finally released his AWESOME 3d mapping library, and i began to cut my teeth on it. it annoyed me that double tap wasn’t there so i added it in, and removed the tilt during zoom functionality as well. I was thinking either 3 touch tilt (ahill’s idea) or maybe a touch and hold button and use the accelerometer to tilt your display of the map, that’d be kinda cool. Also i think the compass, and gps should be tied into the core library, for map orientation, and location capabilitites. I’ll be adding this release to FAK’s source if he wants when he gets back, but i wanted to start a good forum on ideas/suggestions for the library while it was fresh until FAK gets up a forum, or suggestion list. Cheers Warren. I’m lazy and didnt feel like posting the file elsewhere. Just right-click and save-as the link below and remove the .jpg extension from the file to reveal the tar.gz. l8rs

Download Source Here, rename to *.tar.gz

Hey guys, i was informed that i used a weak cipher combination on my last post and example. I’ve done some more reading, learned a ton more about encryption today , and have come up with this based on the MSDN examples, and some more reading. Cheers.

public static class PageSecurity
    {
        private const string bKey = "Fvjh834funw0uw34nf9we80yfw07FYB3Q4FNH74329";

        private static byte[] bSalt {
            get { return new byte[] { 0x23, 0x5e, 0x2d, 0x65, 0x94, 0x7a, 0x62, 0x64, 0x5d, 0x3c,0xe3, 0xee, 0xfa }; }
        }

        public static string EncryptString (string plainText)
        {
            Rfc2898DeriveBytes rdb = new Rfc2898DeriveBytes (bKey + UIDevice.CurrentDevice.UniqueIdentifier, bSalt);

            byte[] Key = rdb.GetBytes (32);

            byte[] IV = rdb.GetBytes (16);

            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException ("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException ("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException ("IV");

            // Declare the stream used to encrypt to an in memory
            // array of bytes.
            MemoryStream msEncrypt = null;

            // Declare the RijndaelManaged object
            // used to encrypt the data.
            RijndaelManaged aesAlg = null;

            try {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged ();
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create a decrytor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor (aesAlg.Key, aesAlg.IV);

                // Create the streams used for encryption.
                msEncrypt = new MemoryStream ();
                using (CryptoStream csEncrypt = new CryptoStream (msEncrypt, encryptor, CryptoStreamMode.Write)) {
                    using (StreamWriter swEncrypt = new StreamWriter (csEncrypt)) {

                        //Write all data to the stream.
                        swEncrypt.Write (plainText);
                    }
                }
            } finally {
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear ();
            }

            // Return the encrypted bytes from the memory stream.
            byte[] retArray = msEncrypt.ToArray ();

            return Convert.ToBase64String (retArray, 0, retArray.Length);

        }

        public static string DecryptString (string cipher)
        {
            Rfc2898DeriveBytes rdb = new Rfc2898DeriveBytes (bKey + UIDevice.CurrentDevice.UniqueIdentifier, bSalt);

            byte[] Key = rdb.GetBytes (32);

            byte[] IV = rdb.GetBytes (16);

            byte[] cipherText = Convert.FromBase64String (cipher);

            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException ("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException ("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException ("IV");

            // Declare the RijndaelManaged object
            // used to decrypt the data.
            RijndaelManaged aesAlg = null;

            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

            try {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged ();
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor (aesAlg.Key, aesAlg.IV);
                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream (cipherText)) {
                    using (CryptoStream csDecrypt = new CryptoStream (msDecrypt, decryptor, CryptoStreamMode.Read)) {
                        using (StreamReader srDecrypt = new StreamReader (csDecrypt))

                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd ();
                    }
                }
            } finally {
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear ();
            }

            return plaintext;
        }

        public static string EncryptString (int value)
        {
            return EncryptString (value.ToString ());

        }
    }

Hey everyone. I threw this together a week ago to facilitate xml serialization of .net objects and storing them encrypted in StandardUserDefaults, or for transmitting encrypted data or whatever. Here’s the class enjoy.


public static class PageSecurity
{
private const string bkey = "AnyAlphaNumbericStr1ng";

return UTF8Encoding.UTF8.GetString(resultArray);
}
}