| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Secret sharing |
| 4 | * |
| 5 | * (c) 2005 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of the Python interface to Catacomb. |
| 11 | * |
| 12 | * Catacomb/Python is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb/Python is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with Catacomb/Python; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | /*----- Header files ------------------------------------------------------*/ |
| 28 | |
| 29 | #include "catacomb-python.h" |
| 30 | |
| 31 | /*----- GF(2^8)-based secret-sharing --------------------------------------*/ |
| 32 | |
| 33 | typedef struct gfshare_pyobj { |
| 34 | PyObject_HEAD |
| 35 | gfshare s; |
| 36 | } gfshare_pyobj; |
| 37 | |
| 38 | static PyTypeObject |
| 39 | *gfshare_pytype, *gfsharesplit_pytype, *gfsharejoin_pytype; |
| 40 | #define GFSHARE_PYCHECK(o) PyObject_TypeCheck((o), gfshare_pytype) |
| 41 | #define GFSHARESPLIT_PYCHECK(o) PyObject_TypeCheck((o), gfsharesplit_pytype) |
| 42 | #define GFSHAREJOIN_PYCHECK(o) PyObject_TypeCheck((o), gfsharejoin_pytype) |
| 43 | #define GFSHARE_S(o) (&((gfshare_pyobj *)(o))->s) |
| 44 | |
| 45 | static void gfshare_pydealloc(PyObject *me) |
| 46 | { |
| 47 | gfshare_destroy(GFSHARE_S(me)); |
| 48 | FREEOBJ(me); |
| 49 | } |
| 50 | |
| 51 | static PyObject *gfsget_threshold(PyObject *me, void *hunoz) |
| 52 | { return (PyInt_FromLong(GFSHARE_S(me)->t)); } |
| 53 | static PyObject *gfsget_size(PyObject *me, void *hunoz) |
| 54 | { return (PyInt_FromLong(GFSHARE_S(me)->sz)); } |
| 55 | |
| 56 | static PyGetSetDef gfshare_pygetset[]= { |
| 57 | #define GETSETNAME(op, name) gfs##op##_##name |
| 58 | GET (threshold, "S.threshold -> THRESHOLD") |
| 59 | GET (size, "S.size -> SECRETSZ") |
| 60 | #undef GETSETNAME |
| 61 | { 0 } |
| 62 | }; |
| 63 | |
| 64 | static PyTypeObject gfshare_pytype_skel = { |
| 65 | PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */ |
| 66 | "GFShare", /* @tp_name@ */ |
| 67 | sizeof(gfshare_pyobj), /* @tp_basicsize@ */ |
| 68 | 0, /* @tp_itemsize@ */ |
| 69 | |
| 70 | gfshare_pydealloc, /* @tp_dealloc@ */ |
| 71 | 0, /* @tp_print@ */ |
| 72 | 0, /* @tp_getattr@ */ |
| 73 | 0, /* @tp_setattr@ */ |
| 74 | 0, /* @tp_compare@ */ |
| 75 | 0, /* @tp_repr@ */ |
| 76 | 0, /* @tp_as_number@ */ |
| 77 | 0, /* @tp_as_sequence@ */ |
| 78 | 0, /* @tp_as_mapping@ */ |
| 79 | 0, /* @tp_hash@ */ |
| 80 | 0, /* @tp_call@ */ |
| 81 | 0, /* @tp_str@ */ |
| 82 | 0, /* @tp_getattro@ */ |
| 83 | 0, /* @tp_setattro@ */ |
| 84 | 0, /* @tp_as_buffer@ */ |
| 85 | Py_TPFLAGS_DEFAULT | /* @tp_flags@ */ |
| 86 | Py_TPFLAGS_BASETYPE, |
| 87 | |
| 88 | /* @tp_doc@ */ |
| 89 | "Binary-field secret sharing base class.", |
| 90 | |
| 91 | 0, /* @tp_traverse@ */ |
| 92 | 0, /* @tp_clear@ */ |
| 93 | 0, /* @tp_richcompare@ */ |
| 94 | 0, /* @tp_weaklistoffset@ */ |
| 95 | 0, /* @tp_iter@ */ |
| 96 | 0, /* @tp_iternext@ */ |
| 97 | 0, /* @tp_methods@ */ |
| 98 | 0, /* @tp_members@ */ |
| 99 | gfshare_pygetset, /* @tp_getset@ */ |
| 100 | 0, /* @tp_base@ */ |
| 101 | 0, /* @tp_dict@ */ |
| 102 | 0, /* @tp_descr_get@ */ |
| 103 | 0, /* @tp_descr_set@ */ |
| 104 | 0, /* @tp_dictoffset@ */ |
| 105 | 0, /* @tp_init@ */ |
| 106 | PyType_GenericAlloc, /* @tp_alloc@ */ |
| 107 | abstract_pynew, /* @tp_new@ */ |
| 108 | 0, /* @tp_free@ */ |
| 109 | 0 /* @tp_is_gc@ */ |
| 110 | }; |
| 111 | |
| 112 | static PyObject *gfsharesplit_pynew(PyTypeObject *ty, |
| 113 | PyObject *arg, PyObject *kw) |
| 114 | { |
| 115 | char *p; |
| 116 | Py_ssize_t n; |
| 117 | unsigned t; |
| 118 | grand *r = &rand_global; |
| 119 | gfshare_pyobj *s; |
| 120 | static const char *const kwlist[] = { "threshold", "secret", "rng", 0 }; |
| 121 | if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&s#|O&:new", KWLIST, |
| 122 | convuint, &t, &p, &n, convgrand, &r)) |
| 123 | goto end; |
| 124 | if (!t || t > 255) VALERR("threshold must be nonzero and < 256"); |
| 125 | s = (gfshare_pyobj *)ty->tp_alloc(ty, 0); |
| 126 | gfshare_create(&s->s, t, n); |
| 127 | gfshare_mkshares(&s->s, r, p); |
| 128 | return ((PyObject *)s); |
| 129 | end: |
| 130 | return (0); |
| 131 | } |
| 132 | |
| 133 | static PyObject *gfsmeth_get(PyObject *me, PyObject *arg) |
| 134 | { |
| 135 | unsigned i; |
| 136 | PyObject *rc = 0; |
| 137 | if (!PyArg_ParseTuple(arg, "O&:get", convuint, &i)) goto end; |
| 138 | if (i >= 255) VALERR("index must be < 255"); |
| 139 | rc = bytestring_pywrap(0, GFSHARE_S(me)->sz); |
| 140 | gfshare_get(GFSHARE_S(me), i, PyString_AS_STRING(rc)); |
| 141 | end: |
| 142 | return (rc); |
| 143 | } |
| 144 | |
| 145 | static PyMethodDef gfsharesplit_pymethods[] = { |
| 146 | #define METHNAME(name) gfsmeth_##name |
| 147 | METH (get, "S.get(I) -> SHARE") |
| 148 | #undef METHNAME |
| 149 | { 0 } |
| 150 | }; |
| 151 | |
| 152 | static PyTypeObject gfsharesplit_pytype_skel = { |
| 153 | PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */ |
| 154 | "GFShareSplit", /* @tp_name@ */ |
| 155 | sizeof(gfshare_pyobj), /* @tp_basicsize@ */ |
| 156 | 0, /* @tp_itemsize@ */ |
| 157 | |
| 158 | gfshare_pydealloc, /* @tp_dealloc@ */ |
| 159 | 0, /* @tp_print@ */ |
| 160 | 0, /* @tp_getattr@ */ |
| 161 | 0, /* @tp_setattr@ */ |
| 162 | 0, /* @tp_compare@ */ |
| 163 | 0, /* @tp_repr@ */ |
| 164 | 0, /* @tp_as_number@ */ |
| 165 | 0, /* @tp_as_sequence@ */ |
| 166 | 0, /* @tp_as_mapping@ */ |
| 167 | 0, /* @tp_hash@ */ |
| 168 | 0, /* @tp_call@ */ |
| 169 | 0, /* @tp_str@ */ |
| 170 | 0, /* @tp_getattro@ */ |
| 171 | 0, /* @tp_setattro@ */ |
| 172 | 0, /* @tp_as_buffer@ */ |
| 173 | Py_TPFLAGS_DEFAULT | /* @tp_flags@ */ |
| 174 | Py_TPFLAGS_BASETYPE, |
| 175 | |
| 176 | /* @tp_doc@ */ |
| 177 | "GFShareSplit(THRESHOLD, SECRET, [rng = rand]): binary-field sharing:\n\ |
| 178 | split secret into shares.", |
| 179 | |
| 180 | 0, /* @tp_traverse@ */ |
| 181 | 0, /* @tp_clear@ */ |
| 182 | 0, /* @tp_richcompare@ */ |
| 183 | 0, /* @tp_weaklistoffset@ */ |
| 184 | 0, /* @tp_iter@ */ |
| 185 | 0, /* @tp_iternext@ */ |
| 186 | gfsharesplit_pymethods, /* @tp_methods@ */ |
| 187 | 0, /* @tp_members@ */ |
| 188 | 0, /* @tp_getset@ */ |
| 189 | 0, /* @tp_base@ */ |
| 190 | 0, /* @tp_dict@ */ |
| 191 | 0, /* @tp_descr_get@ */ |
| 192 | 0, /* @tp_descr_set@ */ |
| 193 | 0, /* @tp_dictoffset@ */ |
| 194 | 0, /* @tp_init@ */ |
| 195 | PyType_GenericAlloc, /* @tp_alloc@ */ |
| 196 | gfsharesplit_pynew, /* @tp_new@ */ |
| 197 | 0, /* @tp_free@ */ |
| 198 | 0 /* @tp_is_gc@ */ |
| 199 | }; |
| 200 | |
| 201 | static PyObject *gfsharejoin_pynew(PyTypeObject *ty, |
| 202 | PyObject *arg, PyObject *kw) |
| 203 | { |
| 204 | unsigned t, sz; |
| 205 | gfshare_pyobj *s; |
| 206 | static const char *const kwlist[] = { "threshold", "size", 0 }; |
| 207 | if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&:new", KWLIST, |
| 208 | convuint, &t, convuint, &sz)) |
| 209 | goto end; |
| 210 | if (!t || t > 255) VALERR("threshold must be nonzero and < 256"); |
| 211 | s = (gfshare_pyobj *)ty->tp_alloc(ty, 0); |
| 212 | gfshare_create(&s->s, t, sz); |
| 213 | return ((PyObject *)s); |
| 214 | end: |
| 215 | return (0); |
| 216 | } |
| 217 | |
| 218 | static PyObject *gfsmeth_addedp(PyObject *me, PyObject *arg) |
| 219 | { |
| 220 | unsigned i; |
| 221 | if (!PyArg_ParseTuple(arg, "O&:addedp", convuint, &i)) goto end; |
| 222 | if (i > 254) VALERR("index must be < 255"); |
| 223 | return (getbool(gfshare_addedp(GFSHARE_S(me), i))); |
| 224 | end: |
| 225 | return (0); |
| 226 | } |
| 227 | |
| 228 | static PyObject *gfsmeth_add(PyObject *me, PyObject *arg) |
| 229 | { |
| 230 | unsigned i; |
| 231 | char *p; |
| 232 | Py_ssize_t n; |
| 233 | if (!PyArg_ParseTuple(arg, "O&s#:add", convuint, &i, &p, &n)) goto end; |
| 234 | if (i > 254) VALERR("index must be < 255"); |
| 235 | if (n != GFSHARE_S(me)->sz) VALERR("bad share size"); |
| 236 | if (gfshare_addedp(GFSHARE_S(me), i)) VALERR("this share already added"); |
| 237 | if (GFSHARE_S(me)->i >= GFSHARE_S(me)->t) VALERR("enough shares already"); |
| 238 | gfshare_add(GFSHARE_S(me), i, p); |
| 239 | return (PyInt_FromLong(GFSHARE_S(me)->t - GFSHARE_S(me)->i)); |
| 240 | end: |
| 241 | return (0); |
| 242 | } |
| 243 | |
| 244 | static PyObject *gfsmeth_combine(PyObject *me, PyObject *arg) |
| 245 | { |
| 246 | PyObject *rc = 0; |
| 247 | if (!PyArg_ParseTuple(arg, ":combine")) goto end; |
| 248 | if (GFSHARE_S(me)->i < GFSHARE_S(me)->t) VALERR("not enough shares yet"); |
| 249 | rc = bytestring_pywrap(0, GFSHARE_S(me)->sz); |
| 250 | gfshare_combine(GFSHARE_S(me), PyString_AS_STRING(rc)); |
| 251 | end: |
| 252 | return (rc); |
| 253 | } |
| 254 | |
| 255 | static PyMethodDef gfsharejoin_pymethods[] = { |
| 256 | #define METHNAME(name) gfsmeth_##name |
| 257 | METH (addedp, "S.addedp(I) -> BOOL") |
| 258 | METH (add, "S.add(I, SHARE) -> REMAIN") |
| 259 | METH (combine, "S.combine() -> SECRET") |
| 260 | #undef METHNAME |
| 261 | { 0 } |
| 262 | }; |
| 263 | |
| 264 | static PyObject *gfsget_remain(PyObject *me, void *hunoz) |
| 265 | { return (PyInt_FromLong(GFSHARE_S(me)->t - GFSHARE_S(me)->i)); } |
| 266 | |
| 267 | static PyGetSetDef gfsharejoin_pygetset[]= { |
| 268 | #define GETSETNAME(op, name) gfs##op##_##name |
| 269 | GET (remain, "S.remain -> REMAIN") |
| 270 | #undef GETSETNAME |
| 271 | { 0 } |
| 272 | }; |
| 273 | |
| 274 | static PyTypeObject gfsharejoin_pytype_skel = { |
| 275 | PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */ |
| 276 | "GFShareJoin", /* @tp_name@ */ |
| 277 | sizeof(gfshare_pyobj), /* @tp_basicsize@ */ |
| 278 | 0, /* @tp_itemsize@ */ |
| 279 | |
| 280 | gfshare_pydealloc, /* @tp_dealloc@ */ |
| 281 | 0, /* @tp_print@ */ |
| 282 | 0, /* @tp_getattr@ */ |
| 283 | 0, /* @tp_setattr@ */ |
| 284 | 0, /* @tp_compare@ */ |
| 285 | 0, /* @tp_repr@ */ |
| 286 | 0, /* @tp_as_number@ */ |
| 287 | 0, /* @tp_as_sequence@ */ |
| 288 | 0, /* @tp_as_mapping@ */ |
| 289 | 0, /* @tp_hash@ */ |
| 290 | 0, /* @tp_call@ */ |
| 291 | 0, /* @tp_str@ */ |
| 292 | 0, /* @tp_getattro@ */ |
| 293 | 0, /* @tp_setattro@ */ |
| 294 | 0, /* @tp_as_buffer@ */ |
| 295 | Py_TPFLAGS_DEFAULT | /* @tp_flags@ */ |
| 296 | Py_TPFLAGS_BASETYPE, |
| 297 | |
| 298 | /* @tp_doc@ */ |
| 299 | "GFShareJoin(THRESHOLD, SIZE): binary field sharing:\n\ |
| 300 | join shares to recover secret.", |
| 301 | |
| 302 | 0, /* @tp_traverse@ */ |
| 303 | 0, /* @tp_clear@ */ |
| 304 | 0, /* @tp_richcompare@ */ |
| 305 | 0, /* @tp_weaklistoffset@ */ |
| 306 | 0, /* @tp_iter@ */ |
| 307 | 0, /* @tp_iternext@ */ |
| 308 | gfsharejoin_pymethods, /* @tp_methods@ */ |
| 309 | 0, /* @tp_members@ */ |
| 310 | gfsharejoin_pygetset, /* @tp_getset@ */ |
| 311 | 0, /* @tp_base@ */ |
| 312 | 0, /* @tp_dict@ */ |
| 313 | 0, /* @tp_descr_get@ */ |
| 314 | 0, /* @tp_descr_set@ */ |
| 315 | 0, /* @tp_dictoffset@ */ |
| 316 | 0, /* @tp_init@ */ |
| 317 | PyType_GenericAlloc, /* @tp_alloc@ */ |
| 318 | gfsharejoin_pynew, /* @tp_new@ */ |
| 319 | 0, /* @tp_free@ */ |
| 320 | 0 /* @tp_is_gc@ */ |
| 321 | }; |
| 322 | |
| 323 | /*----- Prime-field secret-sharing ----------------------------------------*/ |
| 324 | |
| 325 | typedef struct share_pyobj { |
| 326 | PyObject_HEAD |
| 327 | share s; |
| 328 | } share_pyobj; |
| 329 | |
| 330 | static PyTypeObject |
| 331 | *share_pytype, *sharesplit_pytype, *sharejoin_pytype; |
| 332 | #define SHARE_PYCHECK(o) PyObject_TypeCheck((o), share_pytype) |
| 333 | #define SHARESPLIT_PYCHECK(o) PyObject_TypeCheck((o), sharesplit_pytype) |
| 334 | #define SHAREJOIN_PYCHECK(o) PyObject_TypeCheck((o), sharejoin_pytype) |
| 335 | #define SHARE_S(o) (&((share_pyobj *)(o))->s) |
| 336 | |
| 337 | static void share_pydealloc(PyObject *me) |
| 338 | { |
| 339 | share_destroy(SHARE_S(me)); |
| 340 | FREEOBJ(me); |
| 341 | } |
| 342 | |
| 343 | static PyObject *sget_threshold(PyObject *me, void *hunoz) |
| 344 | { return (PyInt_FromLong(SHARE_S(me)->t)); } |
| 345 | static PyObject *sget_modulus(PyObject *me, void *hunoz) |
| 346 | { return (mp_pywrap(SHARE_S(me)->p)); } |
| 347 | |
| 348 | static PyGetSetDef share_pygetset[]= { |
| 349 | #define GETSETNAME(op, name) s##op##_##name |
| 350 | GET (threshold, "S.threshold -> THRESHOLD") |
| 351 | GET (modulus, "S.modulus -> MODULUS") |
| 352 | #undef GETSETNAME |
| 353 | { 0 } |
| 354 | }; |
| 355 | |
| 356 | static PyTypeObject share_pytype_skel = { |
| 357 | PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */ |
| 358 | "Share", /* @tp_name@ */ |
| 359 | sizeof(share_pyobj), /* @tp_basicsize@ */ |
| 360 | 0, /* @tp_itemsize@ */ |
| 361 | |
| 362 | share_pydealloc, /* @tp_dealloc@ */ |
| 363 | 0, /* @tp_print@ */ |
| 364 | 0, /* @tp_getattr@ */ |
| 365 | 0, /* @tp_setattr@ */ |
| 366 | 0, /* @tp_compare@ */ |
| 367 | 0, /* @tp_repr@ */ |
| 368 | 0, /* @tp_as_number@ */ |
| 369 | 0, /* @tp_as_sequence@ */ |
| 370 | 0, /* @tp_as_mapping@ */ |
| 371 | 0, /* @tp_hash@ */ |
| 372 | 0, /* @tp_call@ */ |
| 373 | 0, /* @tp_str@ */ |
| 374 | 0, /* @tp_getattro@ */ |
| 375 | 0, /* @tp_setattro@ */ |
| 376 | 0, /* @tp_as_buffer@ */ |
| 377 | Py_TPFLAGS_DEFAULT | /* @tp_flags@ */ |
| 378 | Py_TPFLAGS_BASETYPE, |
| 379 | |
| 380 | /* @tp_doc@ */ |
| 381 | "Prime-field secret sharing base class.", |
| 382 | |
| 383 | 0, /* @tp_traverse@ */ |
| 384 | 0, /* @tp_clear@ */ |
| 385 | 0, /* @tp_richcompare@ */ |
| 386 | 0, /* @tp_weaklistoffset@ */ |
| 387 | 0, /* @tp_iter@ */ |
| 388 | 0, /* @tp_iternext@ */ |
| 389 | 0, /* @tp_methods@ */ |
| 390 | 0, /* @tp_members@ */ |
| 391 | share_pygetset, /* @tp_getset@ */ |
| 392 | 0, /* @tp_base@ */ |
| 393 | 0, /* @tp_dict@ */ |
| 394 | 0, /* @tp_descr_get@ */ |
| 395 | 0, /* @tp_descr_set@ */ |
| 396 | 0, /* @tp_dictoffset@ */ |
| 397 | 0, /* @tp_init@ */ |
| 398 | PyType_GenericAlloc, /* @tp_alloc@ */ |
| 399 | abstract_pynew, /* @tp_new@ */ |
| 400 | 0, /* @tp_free@ */ |
| 401 | 0 /* @tp_is_gc@ */ |
| 402 | }; |
| 403 | |
| 404 | static PyObject *sharesplit_pynew(PyTypeObject *ty, |
| 405 | PyObject *arg, PyObject *kw) |
| 406 | { |
| 407 | mp *sec = 0; |
| 408 | unsigned t; |
| 409 | grand *r = &rand_global; |
| 410 | mp *m = 0; |
| 411 | share_pyobj *s; |
| 412 | static const char *const kwlist[] = |
| 413 | { "threshold", "secret", "modulus", "rng", 0 }; |
| 414 | |
| 415 | if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&|O&O&:new", KWLIST, |
| 416 | convuint, &t, convmp, &sec, |
| 417 | convmp, &m, convgrand, &r)) |
| 418 | goto end; |
| 419 | if (!t) VALERR("threshold must be nonzero"); |
| 420 | s = (share_pyobj *)ty->tp_alloc(ty, 0); |
| 421 | share_create(&s->s, t); |
| 422 | s->s.p = m; |
| 423 | share_mkshares(&s->s, r, sec); |
| 424 | mp_drop(sec); |
| 425 | return ((PyObject *)s); |
| 426 | end: |
| 427 | mp_drop(m); |
| 428 | mp_drop(sec); |
| 429 | return (0); |
| 430 | } |
| 431 | |
| 432 | static PyObject *smeth_get(PyObject *me, PyObject *arg) |
| 433 | { |
| 434 | unsigned i; |
| 435 | PyObject *rc = 0; |
| 436 | if (!PyArg_ParseTuple(arg, "O&:get", convuint, &i)) goto end; |
| 437 | rc = mp_pywrap(share_get(SHARE_S(me), MP_NEW, i)); |
| 438 | end: |
| 439 | return (rc); |
| 440 | } |
| 441 | |
| 442 | static PyMethodDef sharesplit_pymethods[] = { |
| 443 | #define METHNAME(name) smeth_##name |
| 444 | METH (get, "S.get(I) -> SHARE") |
| 445 | #undef METHNAME |
| 446 | { 0 } |
| 447 | }; |
| 448 | |
| 449 | static PyTypeObject sharesplit_pytype_skel = { |
| 450 | PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */ |
| 451 | "ShareSplit", /* @tp_name@ */ |
| 452 | sizeof(share_pyobj), /* @tp_basicsize@ */ |
| 453 | 0, /* @tp_itemsize@ */ |
| 454 | |
| 455 | share_pydealloc, /* @tp_dealloc@ */ |
| 456 | 0, /* @tp_print@ */ |
| 457 | 0, /* @tp_getattr@ */ |
| 458 | 0, /* @tp_setattr@ */ |
| 459 | 0, /* @tp_compare@ */ |
| 460 | 0, /* @tp_repr@ */ |
| 461 | 0, /* @tp_as_number@ */ |
| 462 | 0, /* @tp_as_sequence@ */ |
| 463 | 0, /* @tp_as_mapping@ */ |
| 464 | 0, /* @tp_hash@ */ |
| 465 | 0, /* @tp_call@ */ |
| 466 | 0, /* @tp_str@ */ |
| 467 | 0, /* @tp_getattro@ */ |
| 468 | 0, /* @tp_setattro@ */ |
| 469 | 0, /* @tp_as_buffer@ */ |
| 470 | Py_TPFLAGS_DEFAULT | /* @tp_flags@ */ |
| 471 | Py_TPFLAGS_BASETYPE, |
| 472 | |
| 473 | /* @tp_doc@ */ |
| 474 | "ShareSplit(THRESHOLD, SECRET, [modulus = ?], [rng = rand]):\n\ |
| 475 | prime field secret sharing: split secret into shares.", |
| 476 | |
| 477 | 0, /* @tp_traverse@ */ |
| 478 | 0, /* @tp_clear@ */ |
| 479 | 0, /* @tp_richcompare@ */ |
| 480 | 0, /* @tp_weaklistoffset@ */ |
| 481 | 0, /* @tp_iter@ */ |
| 482 | 0, /* @tp_iternext@ */ |
| 483 | sharesplit_pymethods, /* @tp_methods@ */ |
| 484 | 0, /* @tp_members@ */ |
| 485 | 0, /* @tp_getset@ */ |
| 486 | 0, /* @tp_base@ */ |
| 487 | 0, /* @tp_dict@ */ |
| 488 | 0, /* @tp_descr_get@ */ |
| 489 | 0, /* @tp_descr_set@ */ |
| 490 | 0, /* @tp_dictoffset@ */ |
| 491 | 0, /* @tp_init@ */ |
| 492 | PyType_GenericAlloc, /* @tp_alloc@ */ |
| 493 | sharesplit_pynew, /* @tp_new@ */ |
| 494 | 0, /* @tp_free@ */ |
| 495 | 0 /* @tp_is_gc@ */ |
| 496 | }; |
| 497 | |
| 498 | static PyObject *sharejoin_pynew(PyTypeObject *ty, |
| 499 | PyObject *arg, PyObject *kw) |
| 500 | { |
| 501 | unsigned t; |
| 502 | mp *m = 0; |
| 503 | share_pyobj *s; |
| 504 | static const char *const kwlist[] = { "threshold", "modulus", 0 }; |
| 505 | if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&:new", KWLIST, |
| 506 | convuint, &t, convmp, &m)) |
| 507 | goto end; |
| 508 | if (!t) VALERR("threshold must be nonzero"); |
| 509 | s = (share_pyobj *)ty->tp_alloc(ty, 0); |
| 510 | share_create(&s->s, t); |
| 511 | s->s.p = m; |
| 512 | return ((PyObject *)s); |
| 513 | end: |
| 514 | mp_drop(m); |
| 515 | return (0); |
| 516 | } |
| 517 | |
| 518 | static PyObject *smeth_addedp(PyObject *me, PyObject *arg) |
| 519 | { |
| 520 | unsigned i; |
| 521 | if (!PyArg_ParseTuple(arg, "O&:addedp", convuint, &i)) goto end; |
| 522 | return (getbool(share_addedp(SHARE_S(me), i))); |
| 523 | end: |
| 524 | return (0); |
| 525 | } |
| 526 | |
| 527 | static PyObject *smeth_add(PyObject *me, PyObject *arg) |
| 528 | { |
| 529 | unsigned i; |
| 530 | mp *s = 0; |
| 531 | PyObject *rc = 0; |
| 532 | if (!PyArg_ParseTuple(arg, "O&O&:add", convuint, &i, convmp, &s)) goto end; |
| 533 | if (MP_NEGP(s) || MP_CMP(s, >=, SHARE_S(me)->p)) |
| 534 | VALERR("share out of range"); |
| 535 | if (share_addedp(SHARE_S(me), i)) VALERR("this share already added"); |
| 536 | if (SHARE_S(me)->i >= SHARE_S(me)->t) VALERR("enough shares already"); |
| 537 | share_add(SHARE_S(me), i, s); |
| 538 | rc = PyInt_FromLong(SHARE_S(me)->t - SHARE_S(me)->i); |
| 539 | end: |
| 540 | mp_drop(s); |
| 541 | return (rc); |
| 542 | } |
| 543 | |
| 544 | static PyObject *smeth_combine(PyObject *me, PyObject *arg) |
| 545 | { |
| 546 | PyObject *rc = 0; |
| 547 | if (!PyArg_ParseTuple(arg, ":combine")) goto end; |
| 548 | if (SHARE_S(me)->i < SHARE_S(me)->t) VALERR("not enough shares yet"); |
| 549 | rc = mp_pywrap(share_combine(SHARE_S(me))); |
| 550 | end: |
| 551 | return (rc); |
| 552 | } |
| 553 | |
| 554 | static PyMethodDef sharejoin_pymethods[] = { |
| 555 | #define METHNAME(name) smeth_##name |
| 556 | METH (addedp, "S.addedp(I) -> BOOL") |
| 557 | METH (add, "S.add(I, SHARE) -> REMAIN") |
| 558 | METH (combine, "S.combine() -> SECRET") |
| 559 | #undef METHNAME |
| 560 | { 0 } |
| 561 | }; |
| 562 | |
| 563 | static PyObject *sget_remain(PyObject *me, void *hunoz) |
| 564 | { return (PyInt_FromLong(SHARE_S(me)->t - SHARE_S(me)->i)); } |
| 565 | |
| 566 | static PyGetSetDef sharejoin_pygetset[]= { |
| 567 | #define GETSETNAME(op, name) s##op##_##name |
| 568 | GET (remain, "S.remain -> REMAIN") |
| 569 | #undef GETSETNAME |
| 570 | { 0 } |
| 571 | }; |
| 572 | |
| 573 | static PyTypeObject sharejoin_pytype_skel = { |
| 574 | PyObject_HEAD_INIT(&PyType_Type) 0, /* Header */ |
| 575 | "ShareJoin", /* @tp_name@ */ |
| 576 | sizeof(share_pyobj), /* @tp_basicsize@ */ |
| 577 | 0, /* @tp_itemsize@ */ |
| 578 | |
| 579 | share_pydealloc, /* @tp_dealloc@ */ |
| 580 | 0, /* @tp_print@ */ |
| 581 | 0, /* @tp_getattr@ */ |
| 582 | 0, /* @tp_setattr@ */ |
| 583 | 0, /* @tp_compare@ */ |
| 584 | 0, /* @tp_repr@ */ |
| 585 | 0, /* @tp_as_number@ */ |
| 586 | 0, /* @tp_as_sequence@ */ |
| 587 | 0, /* @tp_as_mapping@ */ |
| 588 | 0, /* @tp_hash@ */ |
| 589 | 0, /* @tp_call@ */ |
| 590 | 0, /* @tp_str@ */ |
| 591 | 0, /* @tp_getattro@ */ |
| 592 | 0, /* @tp_setattro@ */ |
| 593 | 0, /* @tp_as_buffer@ */ |
| 594 | Py_TPFLAGS_DEFAULT | /* @tp_flags@ */ |
| 595 | Py_TPFLAGS_BASETYPE, |
| 596 | |
| 597 | /* @tp_doc@ */ |
| 598 | "ShareJoin(THRESHOLD, MODULUS): prime field secret sharing:\n\ |
| 599 | join shares to recover secret.", |
| 600 | |
| 601 | 0, /* @tp_traverse@ */ |
| 602 | 0, /* @tp_clear@ */ |
| 603 | 0, /* @tp_richcompare@ */ |
| 604 | 0, /* @tp_weaklistoffset@ */ |
| 605 | 0, /* @tp_iter@ */ |
| 606 | 0, /* @tp_iternext@ */ |
| 607 | sharejoin_pymethods, /* @tp_methods@ */ |
| 608 | 0, /* @tp_members@ */ |
| 609 | sharejoin_pygetset, /* @tp_getset@ */ |
| 610 | 0, /* @tp_base@ */ |
| 611 | 0, /* @tp_dict@ */ |
| 612 | 0, /* @tp_descr_get@ */ |
| 613 | 0, /* @tp_descr_set@ */ |
| 614 | 0, /* @tp_dictoffset@ */ |
| 615 | 0, /* @tp_init@ */ |
| 616 | PyType_GenericAlloc, /* @tp_alloc@ */ |
| 617 | sharejoin_pynew, /* @tp_new@ */ |
| 618 | 0, /* @tp_free@ */ |
| 619 | 0 /* @tp_is_gc@ */ |
| 620 | }; |
| 621 | |
| 622 | /*----- Global stuff ------------------------------------------------------*/ |
| 623 | |
| 624 | void share_pyinit(void) |
| 625 | { |
| 626 | INITTYPE(gfshare, root); |
| 627 | INITTYPE(gfsharesplit, gfshare); |
| 628 | INITTYPE(gfsharejoin, gfshare); |
| 629 | INITTYPE(share, root); |
| 630 | INITTYPE(sharesplit, share); |
| 631 | INITTYPE(sharejoin, share); |
| 632 | } |
| 633 | |
| 634 | void share_pyinsert(PyObject *mod) |
| 635 | { |
| 636 | INSERT("GFShare", gfshare_pytype); |
| 637 | INSERT("GFShareSplit", gfsharesplit_pytype); |
| 638 | INSERT("GFShareJoin", gfsharejoin_pytype); |
| 639 | INSERT("Share", share_pytype); |
| 640 | INSERT("ShareSplit", sharesplit_pytype); |
| 641 | INSERT("ShareJoin", sharejoin_pytype); |
| 642 | } |
| 643 | |
| 644 | /*----- That's all, folks -------------------------------------------------*/ |