+/*----- Generators from symmetric encryption algorithms -------------------*/
+
+static PyTypeObject *gccrand_pytype, *gcrand_pytype;
+
+typedef grand *gcrand_func(const void *, size_t sz);
+typedef grand *gcirand_func(const void *, size_t sz, uint32);
+typedef grand *gcnrand_func(const void *, size_t sz, const void *);
+typedef struct gccrand_info {
+ const char *name;
+ const octet *keysz;
+ unsigned f;
+ size_t noncesz;
+ gcrand_func *func;
+} gccrand_info;
+
+#define RNGF_INT 1u
+#define RNGF_NONCE 2u
+
+typedef struct gccrand_pyobj {
+ PyHeapTypeObject ty;
+ const gccrand_info *info;
+} gccrand_pyobj;
+#define GCCRAND_INFO(o) (((gccrand_pyobj *)(o))->info)
+
+#define GCCRAND_DEF(name, ksz, func, f, nsz) \
+ static const gccrand_info func##_info = \
+ { name, ksz, f, nsz, (gcrand_func *)func };
+RNGS(GCCRAND_DEF)
+
+static const gccrand_info *const gcrandtab[] = {
+#define GCCRAND_ENTRY(name, ksz, func, f, nsz) &func##_info,
+ RNGS(GCCRAND_ENTRY)
+ 0
+};
+
+static PyObject *gcrand_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
+{
+ const gccrand_info *info = GCCRAND_INFO(ty);
+ static char *kwlist[] = { "key", 0 };
+ char *k;
+ int n;
+
+ if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &k, &n))
+ goto end;
+ if (keysz(n, info->keysz) != n) VALERR("bad key length");
+ return (grand_dopywrap(ty, info->func(k, n), f_freeme));
+end:
+ return (0);
+}
+
+static PyObject *gcirand_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
+{
+ const gccrand_info *info = GCCRAND_INFO(ty);
+ uint32 i = 0;
+ static char *kwlist[] = { "key", "i", 0 };
+ char *k;
+ int n;
+
+ if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#O&:new", kwlist,
+ &k, &n, convu32, &i))
+ goto end;
+ if (keysz(n, info->keysz) != n) VALERR("bad key length");
+ return (grand_dopywrap(ty,
+ ((gcirand_func *)info->func)(k, n, i),
+ f_freeme));
+end:
+ return (0);
+}
+
+static PyObject *gcnrand_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
+{
+ const gccrand_info *info = GCCRAND_INFO(ty);
+ static char *kwlist[] = { "key", "nonce", 0 };
+ char *k, *n;
+ int ksz, nsz;
+
+ if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#s#:new", kwlist,
+ &k, &ksz, &n, &nsz))
+ goto end;
+ if (keysz(ksz, info->keysz) != ksz) VALERR("bad key length");
+ if (nsz != info->noncesz) VALERR("bad nonce length");
+ return (grand_dopywrap(ty,
+ ((gcnrand_func *)info->func)(k, ksz, n),
+ f_freeme));
+end:
+ return (0);
+}
+
+static PyObject *gccrand_pywrap(const gccrand_info *info)
+{
+ gccrand_pyobj *g = newtype(gccrand_pytype, 0, info->name);
+ g->info = info;
+ g->ty.ht_type.tp_basicsize = sizeof(grand_pyobj);
+ g->ty.ht_type.tp_base = gcrand_pytype;
+ Py_INCREF(gcrand_pytype);
+ g->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
+ Py_TPFLAGS_BASETYPE |
+ Py_TPFLAGS_HEAPTYPE);
+ g->ty.ht_type.tp_alloc = PyType_GenericAlloc;
+ g->ty.ht_type.tp_free = 0;
+ if (info->f & RNGF_INT) g->ty.ht_type.tp_new = gcirand_pynew;
+ else if (info->f & RNGF_NONCE) g->ty.ht_type.tp_new = gcnrand_pynew;
+ else g->ty.ht_type.tp_new = gcrand_pynew;
+ typeready(&g->ty.ht_type);
+ return ((PyObject *)g);
+}
+
+static PyObject *gccrget_name(PyObject *me, void *hunoz)
+ { return (PyString_FromString(GCCRAND_INFO(me)->name)); }
+static PyObject *gccrget_keysz(PyObject *me, void *hunoz)
+ { return (keysz_pywrap(GCCRAND_INFO(me)->keysz)); }
+
+static PyGetSetDef gccrand_pygetset[] = {
+#define GETSETNAME(op, name) gccr##op##_##name
+ GET (keysz, "CR.keysz -> acceptable key sizes")
+ GET (name, "CR.name -> name of this kind of generator")
+#undef GETSETNAME
+ { 0 }
+};
+
+static PyTypeObject gccrand_pytype_skel = {
+ PyObject_HEAD_INIT(0) 0, /* Header */
+ "GCCRand", /* @tp_name@ */
+ sizeof(gccrand_pyobj), /* @tp_basicsize@ */
+ 0, /* @tp_itemsize@ */
+
+ 0, /* @tp_dealloc@ */
+ 0, /* @tp_print@ */
+ 0, /* @tp_getattr@ */
+ 0, /* @tp_setattr@ */
+ 0, /* @tp_compare@ */
+ 0, /* @tp_repr@ */
+ 0, /* @tp_as_number@ */
+ 0, /* @tp_as_sequence@ */
+ 0, /* @tp_as_mapping@ */
+ 0, /* @tp_hash@ */
+ 0, /* @tp_call@ */
+ 0, /* @tp_str@ */
+ 0, /* @tp_getattro@ */
+ 0, /* @tp_setattro@ */
+ 0, /* @tp_as_buffer@ */
+ Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
+ Py_TPFLAGS_BASETYPE,
+
+ /* @tp_doc@ */
+"Metaclass for symmetric crypto-based generators.",
+
+ 0, /* @tp_traverse@ */
+ 0, /* @tp_clear@ */
+ 0, /* @tp_richcompare@ */
+ 0, /* @tp_weaklistoffset@ */
+ 0, /* @tp_iter@ */
+ 0, /* @tp_iternext@ */
+ 0, /* @tp_methods@ */
+ 0, /* @tp_members@ */
+ gccrand_pygetset, /* @tp_getset@ */
+ 0, /* @tp_base@ */
+ 0, /* @tp_dict@ */
+ 0, /* @tp_descr_get@ */
+ 0, /* @tp_descr_set@ */
+ 0, /* @tp_dictoffset@ */
+ 0, /* @tp_init@ */
+ PyType_GenericAlloc, /* @tp_alloc@ */
+ abstract_pynew, /* @tp_new@ */
+ 0, /* @tp_free@ */
+ 0 /* @tp_is_gc@ */
+};
+
+static PyTypeObject gcrand_pytype_skel = {
+ PyObject_HEAD_INIT(0) 0, /* Header */
+ "GCRand", /* @tp_name@ */
+ sizeof(grand_pyobj), /* @tp_basicsize@ */
+ 0, /* @tp_itemsize@ */
+
+ grand_pydealloc, /* @tp_dealloc@ */
+ 0, /* @tp_print@ */
+ 0, /* @tp_getattr@ */
+ 0, /* @tp_setattr@ */
+ 0, /* @tp_compare@ */
+ 0, /* @tp_repr@ */
+ 0, /* @tp_as_number@ */
+ 0, /* @tp_as_sequence@ */
+ 0, /* @tp_as_mapping@ */
+ 0, /* @tp_hash@ */
+ 0, /* @tp_call@ */
+ 0, /* @tp_str@ */
+ 0, /* @tp_getattro@ */
+ 0, /* @tp_setattro@ */
+ 0, /* @tp_as_buffer@ */
+ Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
+ Py_TPFLAGS_BASETYPE,
+
+ /* @tp_doc@ */
+"Abstract base class for symmetric crypto-based generators.",
+
+ 0, /* @tp_traverse@ */
+ 0, /* @tp_clear@ */
+ 0, /* @tp_richcompare@ */
+ 0, /* @tp_weaklistoffset@ */
+ 0, /* @tp_iter@ */
+ 0, /* @tp_iternext@ */
+ 0, /* @tp_methods@ */
+ 0, /* @tp_members@ */
+ 0, /* @tp_getset@ */
+ 0, /* @tp_base@ */
+ 0, /* @tp_dict@ */
+ 0, /* @tp_descr_get@ */
+ 0, /* @tp_descr_set@ */
+ 0, /* @tp_dictoffset@ */
+ 0, /* @tp_init@ */
+ PyType_GenericAlloc, /* @tp_alloc@ */
+ abstract_pynew, /* @tp_new@ */
+ 0, /* @tp_free@ */
+ 0 /* @tp_is_gc@ */
+};
+