Added support for A5/2, A5/3, A5/4. Issue #85
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@ -3,15 +3,25 @@
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<name>Decryption</name>
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<name>Decryption</name>
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<key>gsm_decryption</key>
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<key>gsm_decryption</key>
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<import>import grgsm</import>
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<import>import grgsm</import>
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<make>grgsm.decryption($k_c)</make>
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<make>grgsm.decryption($k_c, $a5_version)</make>
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<param>
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<param>
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<name>Kc session key</name>
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<name>Kc session key</name>
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<key>k_c</key>
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<key>k_c</key>
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<value>[0,0,0,0,0,0,0,0]</value>
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<value>[0,0,0,0,0,0,0,0]</value>
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<type>int_vector</type>
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<type>int_vector</type>
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</param>
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</param>
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<param>
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<name>A5 version</name>
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<key>a5_version</key>
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<value>1</value>
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<type>int</type>
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</param>
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<check>$a5_version > 0</check>
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<check>$a5_version < 5</check>
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<sink>
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<sink>
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<name>bursts</name>
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<name>bursts</name>
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<type>message</type>
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<type>message</type>
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@ -20,5 +30,5 @@
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<name>bursts</name>
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<name>bursts</name>
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<type>message</type>
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<type>message</type>
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</source>
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</source>
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</block>
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</block>
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@ -1,14 +1,14 @@
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/* -*- c++ -*- */
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/* -*- c++ -*- */
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/*
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/*
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* @file
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* @file
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* @author Piotr Krysik <ptrkrysik@gmail.com>
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* @author Piotr Krysik <ptrkrysik@gmail.com>
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* @section LICENSE
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* @section LICENSE
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*
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*
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* Gr-gsm is free software; you can redistribute it and/or modify
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* Gr-gsm is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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* any later version.
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*
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*
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* Gr-gsm is distributed in the hope that it will be useful,
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* Gr-gsm is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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@ -18,7 +18,7 @@
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* along with gr-gsm; see the file COPYING. If not, write to
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* along with gr-gsm; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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* Boston, MA 02110-1301, USA.
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*
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*
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*/
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*/
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@ -50,8 +50,9 @@ namespace gr {
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* class. gsm::decryption::make is the public interface for
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* class. gsm::decryption::make is the public interface for
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* creating new instances.
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* creating new instances.
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*/
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*/
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static sptr make(const std::vector<uint8_t> & k_c);
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static sptr make(const std::vector<uint8_t> & k_c, unsigned int a5_version);
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virtual void set_k_c(const std::vector<uint8_t> & k_c) = 0;
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virtual void set_k_c(const std::vector<uint8_t> & k_c) = 0;
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virtual void set_a5_version(unsigned int a5_version) = 0;
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};
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};
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} // namespace gsm
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} // namespace gsm
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@ -25,6 +25,7 @@
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#include <gnuradio/io_signature.h>
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#include <gnuradio/io_signature.h>
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#include <grgsm/gsmtap.h>
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#include <grgsm/gsmtap.h>
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#include <grgsm/endian.h>
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#include <grgsm/endian.h>
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#include <numeric>
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#include "decryption_impl.h"
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#include "decryption_impl.h"
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extern "C" {
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extern "C" {
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@ -37,21 +38,24 @@ namespace gr {
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namespace gsm {
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namespace gsm {
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decryption::sptr
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decryption::sptr
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decryption::make(const std::vector<uint8_t> & k_c)
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decryption::make(const std::vector<uint8_t> & k_c, unsigned int a5_version)
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{
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{
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return gnuradio::get_initial_sptr
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return gnuradio::get_initial_sptr
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(new decryption_impl(k_c));
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(new decryption_impl(k_c, a5_version));
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}
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}
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/*
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/*
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* The private constructor
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* The private constructor
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*/
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*/
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decryption_impl::decryption_impl(const std::vector<uint8_t> & k_c)
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decryption_impl::decryption_impl(const std::vector<uint8_t> & k_c, unsigned int a5_version)
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: gr::block("decryption",
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: gr::block("decryption",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0))
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gr::io_signature::make(0, 0, 0)),
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d_k_c_valid(false)
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{
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{
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set_k_c(k_c);
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set_k_c(k_c);
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set_a5_version(a5_version);
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validate_k_c();
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// std::cout << "Be careful with decryption block - it wasn't tested yet!" << std::endl;
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// std::cout << "Be careful with decryption block - it wasn't tested yet!" << std::endl;
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message_port_register_in(pmt::mp("bursts"));
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message_port_register_in(pmt::mp("bursts"));
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@ -68,29 +72,50 @@ namespace gr {
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void decryption_impl::set_k_c(const std::vector<uint8_t> & k_c)
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void decryption_impl::set_k_c(const std::vector<uint8_t> & k_c)
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{
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{
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if (k_c.size() == 8)
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d_k_c = k_c;
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}
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void decryption_impl::set_a5_version(unsigned int a5_version)
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{
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d_a5_version = 1;
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if (a5_version >= 1 && a5_version <= 4)
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{
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{
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for (int i=0; i<8; i++)
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d_a5_version = a5_version;
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{
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}
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d_k_c[i] = k_c[i];
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}
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}
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void decryption_impl::validate_k_c()
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{
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if (d_k_c.size() == 0)
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{
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d_k_c_valid = false;
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return;
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}
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else if ((d_a5_version < 4 && d_k_c.size() != 8) || (d_a5_version == 4 && d_k_c.size() != 16))
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{
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d_k_c_valid = false;
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return;
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}
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}
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else
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else
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{
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{
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for (int i=0; i<8; i++)
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for (int i=0; i<d_k_c.size(); i++)
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{
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{
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d_k_c[i] = 0;
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if (d_k_c[i] != 0)
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{
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d_k_c_valid = true;
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return;
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}
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}
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}
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}
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}
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}
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}
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void decryption_impl::decrypt(pmt::pmt_t msg)
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void decryption_impl::decrypt(pmt::pmt_t msg)
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{
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{
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if(d_k_c[0] == 0 && d_k_c[1] == 0 && d_k_c[2] == 0 && d_k_c[3] == 0 &
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if (!d_k_c_valid)
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d_k_c[4] == 0 && d_k_c[5] == 0 && d_k_c[6] == 0 && d_k_c[7] == 0)
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{
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{
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message_port_pub(pmt::mp("bursts"), msg);
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message_port_pub(pmt::mp("bursts"), msg);
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} else
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}
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else
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{
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{
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uint8_t decrypted_data[BURST_SIZE];
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uint8_t decrypted_data[BURST_SIZE];
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uint8_t keystream[114];
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uint8_t keystream[114];
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@ -104,10 +129,10 @@ namespace gr {
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if(uplink_burst){
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if(uplink_burst){
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//process uplink burst
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//process uplink burst
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osmo_a5(1, d_k_c, frame_number, NULL, keystream);
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osmo_a5(d_a5_version, &d_k_c[0], frame_number, NULL, keystream);
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} else {
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} else {
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//process downlink burst
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//process downlink burst
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osmo_a5(1, d_k_c, frame_number, keystream, NULL);
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osmo_a5(d_a5_version, &d_k_c[0], frame_number, keystream, NULL);
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}
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}
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/* guard bits */
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/* guard bits */
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for (int i = 0; i < 3; i++) {
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for (int i = 0; i < 3; i++) {
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class decryption_impl : public decryption
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class decryption_impl : public decryption
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{
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{
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private:
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private:
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// std::vector<uint8_t> d_k_c;
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std::vector<uint8_t> d_k_c;
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uint8_t d_k_c[8];
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bool d_k_c_valid;
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uint8_t d_a5_version;
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void decrypt(pmt::pmt_t msg);
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void decrypt(pmt::pmt_t msg);
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void validate_k_c();
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public:
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public:
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decryption_impl(const std::vector<uint8_t> & k_c);
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decryption_impl(const std::vector<uint8_t> & k_c, unsigned int a5_version);
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~decryption_impl();
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~decryption_impl();
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virtual void set_k_c(const std::vector<uint8_t> & k_c);
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virtual void set_k_c(const std::vector<uint8_t> & k_c);
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virtual void set_a5_version(unsigned int a5_version);
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};
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};
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} // namespace gsm
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} // namespace gsm
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} // namespace gr
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} // namespace gr
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