Sms Encryption - Decryption

A few years ago, i tried to do a mobile sms cryption applicatio with bouncycastle.


public byte[] smsEncodedMessage ( byte[] smsEncContent , byte[] smsEncPKey ) throws Exception {
        try {
            cipherEngine = new PaddedBufferedBlockCipher ( createEngine () );
            cipherEngine.init ( true , new KeyParameter ( smsEncPKey ) );
            cipherText = new byte[ cipherEngine.getOutputSize ( smsEncContent.length ) ];
            cipherTextLength = cipherEngine.processBytes ( smsEncContent , 0 , smsEncContent.length , cipherText , 0 );
            cipherEngine.doFinal ( cipherText , cipherTextLength );
            out = new ByteArrayOutputStream ();
            dout = new DataOutputStream ( out );
            dout.writeShort ( cipherText.length );
            out.write ( cipherText );
        } catch ( Exception e ) {
            main.errorMessage ( "<ERROR BLOCK - inLine < 1 > >: " + e.getMessage () );
        }

        return out.toByteArray ();
    }

    public String smsDecodedMessage ( byte smsDecContent[] , byte[] smsDecPKey ) throws Exception {
        try {
            in = new ByteArrayInputStream ( smsDecContent );
            din = new DataInputStream ( in );
            cipherTextLength = din.readShort ();
            cipherText = new byte[ cipherTextLength ];
            in.read ( cipherText , 0 , cipherTextLength );
            cipherEngine = new PaddedBufferedBlockCipher ( createEngine () );
            cipherEngine.init ( false , new KeyParameter ( smsDecPKey ) );
            plainText = new byte[ cipherEngine.getOutputSize ( cipherTextLength ) ];
            size = cipherEngine.processBytes ( cipherText , 0 , cipherTextLength , plainText , 0 );
            cipherEngine.doFinal ( plainText , size );
            resultText = ( new String ( plainText ) ).trim ();
        } catch ( Exception e ) {
            main.errorMessage ( "<ERROR BLOCK - inLine < 2 > >: " + e.getMessage () );
        }
        return resultText;
    }