lib/crypto/py_crypto.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba crypto functions
   4
   5    Copyright (C) Alexander Bokovoy <ab@samba.org> 2017
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <Python.h>
  22 #include "includes.h"
  23 #include "python/py3compat.h"
  24 #include "lib/crypto/arcfour.h"
  25
  26 static PyObject *py_crypto_arcfour_crypt_blob(PyObject *module, PyObject *args, PyObject *kwargs)
  27 {
  28         DATA_BLOB data, key;
  29         PyObject *py_data, *py_key, *result;
  30         TALLOC_CTX *ctx;
  31
  32         if (!PyArg_ParseTuple(args, "OO", &py_data, &py_key))
  33                 return NULL;
  34
  35         if (!PyBytes_Check(py_data)) {
  36                 PyErr_Format(PyExc_TypeError, "bytes expected");
  37                 return NULL;
  38         }
  39
  40         if (!PyBytes_Check(py_key)) {
  41                 PyErr_Format(PyExc_TypeError, "bytes expected");
  42                 return NULL;
  43         }
  44
  45         ctx = talloc_new(NULL);
  46
  47         data.length = PyBytes_Size(py_data);
  48         data.data = talloc_memdup(ctx, PyBytes_AsString(py_data), data.length);
  49         if (!data.data) {
  50                 talloc_free(ctx);
  51                 return PyErr_NoMemory();
  52         }
  53
  54         key.data = (uint8_t *)PyBytes_AsString(py_key);
  55         key.length = PyBytes_Size(py_key);
  56
  57         arcfour_crypt_blob(data.data, data.length, &key);
  58
  59         result = PyBytes_FromStringAndSize((const char*) data.data, data.length);
  60         talloc_free(ctx);
  61         return result;
  62 }
  63
  64
  65 static const char py_crypto_arcfour_crypt_blob_doc[] = "arcfour_crypt_blob(data, key)\n"
  66                                          "Encrypt the data with RC4 algorithm using the key";
  67
  68 static PyMethodDef py_crypto_methods[] = {
  69         { "arcfour_crypt_blob", (PyCFunction)py_crypto_arcfour_crypt_blob, METH_VARARGS, py_crypto_arcfour_crypt_blob_doc },
  70         { NULL },
  71 };
  72
  73 static struct PyModuleDef moduledef = {
  74         PyModuleDef_HEAD_INIT,
  75         .m_name = "crypto",
  76         .m_doc = "Crypto functions required for SMB",
  77         .m_size = -1,
  78         .m_methods = py_crypto_methods,
  79 };
  80
  81 MODULE_INIT_FUNC(crypto)
  82 {
  83         PyObject *m;
  84
  85         m = PyModule_Create(&moduledef);
  86         if (m == NULL)
  87                 return NULL;
  88
  89         return m;
  90 }