java - Encryption compatible between Android and C# -

i've found plenty of examples how encryption in c#, , couple android, i'm particularly looking way handle encrypting (using aes, tripledes, etc.) android, , wind being decrypted in c#. found example encoding aes in android , encoding/decoding aes in c# not sure if these compatible (c# requires iv, nothing specified in android example). also, recommendation on way of encoding encrypted string transmission on http (base64?) helpful. thanks.

got http://oogifu.blogspot.com/2009/01/aes-in-java-and-c.html.

here java class:

package com.neocodenetworks.smsfwd;  import java.security.*; import javax.crypto.*; import javax.crypto.spec.*; import android.util.log;  public class crypto {     public static final string tag = "smsfwd";      private static cipher aescipher;     private static secretkey secretkey;     private static ivparameterspec ivparameterspec;      private static string cipher_transformation = "aes/cbc/pkcs5padding";     private static string cipher_algorithm = "aes";     // replace me 16-byte key, share between java , c#     private static byte[] rawsecretkey = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,                                           0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};      private static string messagedigest_algorithm = "md5";      public crypto(string passphrase) {         byte[] passwordkey = encodedigest(passphrase);          try {             aescipher = cipher.getinstance(cipher_transformation);         } catch (nosuchalgorithmexception e) {             log.e(tag, "no such algorithm " + cipher_algorithm, e);         } catch (nosuchpaddingexception e) {             log.e(tag, "no such padding pkcs5", e);         }          secretkey = new secretkeyspec(passwordkey, cipher_algorithm);         ivparameterspec = new ivparameterspec(rawsecretkey);     }      public string encryptasbase64(byte[] cleardata) {         byte[] encrypteddata = encrypt(cleardata);         return net.iharder.base64.base64.encodebytes(encrypteddata);     }      public byte[] encrypt(byte[] cleardata) {         try {             aescipher.init(cipher.encrypt_mode, secretkey, ivparameterspec);         } catch (invalidkeyexception e) {             log.e(tag, "invalid key", e);             return null;         } catch (invalidalgorithmparameterexception e) {             log.e(tag, "invalid algorithm " + cipher_algorithm, e);             return null;         }          byte[] encrypteddata;         try {             encrypteddata = aescipher.dofinal(cleardata);         } catch (illegalblocksizeexception e) {             log.e(tag, "illegal block size", e);             return null;         } catch (badpaddingexception e) {             log.e(tag, "bad padding", e);             return null;         }         return encrypteddata;     }      private byte[] encodedigest(string text) {         messagedigest digest;         try {             digest = messagedigest.getinstance(messagedigest_algorithm);             return digest.digest(text.getbytes());         } catch (nosuchalgorithmexception e) {             log.e(tag, "no such algorithm " + messagedigest_algorithm, e);         }          return null;     } } 

i used http://iharder.sourceforge.net/current/java/base64/ base64 encoding.

here's c# class:

using system; using system.text; using system.security.cryptography;  namespace smsfwdclient {     public class crypto     {         private icryptotransform rijndaeldecryptor;         // replace me 16-byte key, share between java , c#         private static byte[] rawsecretkey = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,                                               0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};          public crypto(string passphrase)         {             byte[] passwordkey = encodedigest(passphrase);             rijndaelmanaged rijndael = new rijndaelmanaged();             rijndaeldecryptor = rijndael.createdecryptor(passwordkey, rawsecretkey);         }          public string decrypt(byte[] encrypteddata)         {             byte[] newcleardata = rijndaeldecryptor.transformfinalblock(encrypteddata, 0, encrypteddata.length);             return encoding.ascii.getstring(newcleardata);         }          public string decryptfrombase64(string encryptedbase64)         {             return decrypt(convert.frombase64string(encryptedbase64));         }          private byte[] encodedigest(string text)         {             md5cryptoserviceprovider x = new system.security.cryptography.md5cryptoserviceprovider();             byte[] data = encoding.ascii.getbytes(text);             return x.computehash(data);         }     } } 

i hope helps else!