1  /*
       2   * Written in 2013 by Dmitry Chestnykh <dmitry@codingrobots.com>
       3   * Modified for CPython by Christian Heimes <christian@python.org>
       4   *
       5   * To the extent possible under law, the author have dedicated all
       6   * copyright and related and neighboring rights to this software to
       7   * the public domain worldwide. This software is distributed without
       8   * any warranty. http://creativecommons.org/publicdomain/zero/1.0/
       9   */
      10  
      11  #ifndef Py_BUILD_CORE_BUILTIN
      12  #  define Py_BUILD_CORE_MODULE 1
      13  #endif
      14  
      15  #include "Python.h"
      16  #include "blake2module.h"
      17  
      18  extern PyType_Spec blake2b_type_spec;
      19  extern PyType_Spec blake2s_type_spec;
      20  
      21  PyDoc_STRVAR(blake2mod__doc__,
      22  "_blake2b provides BLAKE2b for hashlib\n"
      23  );
      24  
      25  typedef struct {
      26      PyTypeObject* blake2b_type;
      27      PyTypeObject* blake2s_type;
      28  } Blake2State;
      29  
      30  static inline Blake2State*
      31  blake2_get_state(PyObject *module)
      32  {
      33      void *state = PyModule_GetState(module);
      34      assert(state != NULL);
      35      return (Blake2State *)state;
      36  }
      37  
      38  static struct PyMethodDef blake2mod_functions[] = {
      39      {NULL, NULL}
      40  };
      41  
      42  static int
      43  _blake2_traverse(PyObject *module, visitproc visit, void *arg)
      44  {
      45      Blake2State *state = blake2_get_state(module);
      46      Py_VISIT(state->blake2b_type);
      47      Py_VISIT(state->blake2s_type);
      48      return 0;
      49  }
      50  
      51  static int
      52  _blake2_clear(PyObject *module)
      53  {
      54      Blake2State *state = blake2_get_state(module);
      55      Py_CLEAR(state->blake2b_type);
      56      Py_CLEAR(state->blake2s_type);
      57      return 0;
      58  }
      59  
      60  static void
      61  _blake2_free(void *module)
      62  {
      63      _blake2_clear((PyObject *)module);
      64  }
      65  
      66  #define ADD_INT(d, name, value) do { \
      67      PyObject *x = PyLong_FromLong(value); \
      68      if (!x) \
      69          return -1; \
      70      if (PyDict_SetItemString(d, name, x) < 0) { \
      71          Py_DECREF(x); \
      72          return -1; \
      73      } \
      74      Py_DECREF(x); \
      75  } while(0)
      76  
      77  static int
      78  blake2_exec(PyObject *m)
      79  {
      80      Blake2State* st = blake2_get_state(m);
      81  
      82      st->blake2b_type = (PyTypeObject *)PyType_FromModuleAndSpec(
      83          m, &blake2b_type_spec, NULL);
      84  
      85      if (NULL == st->blake2b_type)
      86          return -1;
      87      /* BLAKE2b */
      88      if (PyModule_AddType(m, st->blake2b_type) < 0) {
      89          return -1;
      90      }
      91  
      92      PyObject *d = st->blake2b_type->tp_dict;
      93      ADD_INT(d, "SALT_SIZE", BLAKE2B_SALTBYTES);
      94      ADD_INT(d, "PERSON_SIZE", BLAKE2B_PERSONALBYTES);
      95      ADD_INT(d, "MAX_KEY_SIZE", BLAKE2B_KEYBYTES);
      96      ADD_INT(d, "MAX_DIGEST_SIZE", BLAKE2B_OUTBYTES);
      97  
      98      PyModule_AddIntConstant(m, "BLAKE2B_SALT_SIZE", BLAKE2B_SALTBYTES);
      99      PyModule_AddIntConstant(m, "BLAKE2B_PERSON_SIZE", BLAKE2B_PERSONALBYTES);
     100      PyModule_AddIntConstant(m, "BLAKE2B_MAX_KEY_SIZE", BLAKE2B_KEYBYTES);
     101      PyModule_AddIntConstant(m, "BLAKE2B_MAX_DIGEST_SIZE", BLAKE2B_OUTBYTES);
     102  
     103      /* BLAKE2s */
     104      st->blake2s_type = (PyTypeObject *)PyType_FromModuleAndSpec(
     105          m, &blake2s_type_spec, NULL);
     106  
     107      if (NULL == st->blake2s_type)
     108          return -1;
     109  
     110      if (PyModule_AddType(m, st->blake2s_type) < 0) {
     111          return -1;
     112      }
     113  
     114      d = st->blake2s_type->tp_dict;
     115      ADD_INT(d, "SALT_SIZE", BLAKE2S_SALTBYTES);
     116      ADD_INT(d, "PERSON_SIZE", BLAKE2S_PERSONALBYTES);
     117      ADD_INT(d, "MAX_KEY_SIZE", BLAKE2S_KEYBYTES);
     118      ADD_INT(d, "MAX_DIGEST_SIZE", BLAKE2S_OUTBYTES);
     119  
     120      PyModule_AddIntConstant(m, "BLAKE2S_SALT_SIZE", BLAKE2S_SALTBYTES);
     121      PyModule_AddIntConstant(m, "BLAKE2S_PERSON_SIZE", BLAKE2S_PERSONALBYTES);
     122      PyModule_AddIntConstant(m, "BLAKE2S_MAX_KEY_SIZE", BLAKE2S_KEYBYTES);
     123      PyModule_AddIntConstant(m, "BLAKE2S_MAX_DIGEST_SIZE", BLAKE2S_OUTBYTES);
     124  
     125      return 0;
     126  }
     127  
     128  static PyModuleDef_Slot _blake2_slots[] = {
     129      {Py_mod_exec, blake2_exec},
     130      {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
     131      {0, NULL}
     132  };
     133  
     134  static struct PyModuleDef blake2_module = {
     135      PyModuleDef_HEAD_INIT,
     136      "_blake2",
     137      .m_doc = blake2mod__doc__,
     138      .m_size = sizeof(Blake2State),
     139      .m_methods = blake2mod_functions,
     140      .m_slots = _blake2_slots,
     141      .m_traverse = _blake2_traverse,
     142      .m_clear = _blake2_clear,
     143      .m_free = _blake2_free,
     144  };
     145  
     146  PyMODINIT_FUNC
     147  PyInit__blake2(void)
     148  {
     149      return PyModuleDef_Init(&blake2_module);
     150  }