rijndael+Encryption

i did this way: didnt encrypt 500 char but .......

   const TInt aBlockSize = 128;
   const TInt aBufSize = KBufferSize;

   //input data
   // Secret message (which fits exactly in one block)   
   TBuf8<aBufSize> secret; //will contain encrypted data
   secret.Copy(aText);
   secret.TrimAll();

   TInt number = secret.Length();
   
   // Init stuff
   TUint8 block[aBlockSize];
   TPtr8 blockPtr(block, aBlockSize);
   aes::keyInstance keyInst;
   aes::cipherInstance cipherInst;

   //
   // Generate key instance for encryption.
   // The secret key material is an hex string
   // with a length of keyLen/4 bytes.
   TInt keyLen = aBlockSize;
   TText8* secretKeyMaterial =
          (TText8*) "E5E6E7E9EA292A2B2D256789012345E5";   
   
   keyInst.blockLen = BITSPERBLOCK;
   aes::makeKey(&keyInst, DIR_ENCRYPT,
             keyLen, secretKeyMaterial);

   //
   // Init cipher instance
   cipherInst.blockLen = BITSPERBLOCK;
   aes::cipherInit(&cipherInst, MODE_ECB, NULL);
   
   //
   // Encrypt block
   // Fill block with our secret message
   blockPtr.Append(secret.Ptr(), number);
   aes::blockEncrypt(&cipherInst, &keyInst,
                 block, BITSPERBLOCK, block);
      
   secret.Zero();
   secret.Copy(blockPtr); //copy blockPtr to secret (buffer)
   secret.TrimAll();   
   blockPtr.Zero();