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154 lines
4.7 KiB
154 lines
4.7 KiB
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program 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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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "py/objstr.h"
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#include "embed/extmod/trezorobj.h"
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#include "rand.h"
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#if USE_OPTIGA
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#include "optiga.h"
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#endif
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/// package: trezorcrypto.random
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/// def uniform(n: int) -> int:
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/// """
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/// Compute uniform random number from interval 0 ... n - 1.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_random_uniform(mp_obj_t n) {
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uint32_t nn = trezor_obj_get_uint(n);
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if (nn == 0) {
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mp_raise_ValueError("Maximum can't be zero");
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}
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return mp_obj_new_int_from_uint(random_uniform(nn));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_random_uniform_obj,
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mod_trezorcrypto_random_uniform);
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/// import builtins
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/// def bytes(len: int, strong: bool = False) -> builtins.bytes:
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/// """
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/// Generate random bytes sequence of length len. If `strong` is set then
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/// maximum sources of entropy are used.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_random_bytes(size_t n_args,
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const mp_obj_t *args) {
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uint32_t len = trezor_obj_get_uint(args[0]);
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if (len > 1024) {
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mp_raise_ValueError("Maximum requested size is 1024");
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}
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vstr_t vstr = {0};
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vstr_init_len(&vstr, len);
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#if USE_OPTIGA
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if (n_args > 1 && mp_obj_is_true(args[1])) {
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uint8_t *dest = (uint8_t *)vstr.buf;
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if (!optiga_random_buffer(dest, len)) {
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vstr_clear(&vstr);
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mp_raise_msg(&mp_type_RuntimeError,
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"Failed to get randomness from Optiga.");
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}
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uint8_t buffer[4] = {0};
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while (len > sizeof(buffer)) {
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random_buffer(buffer, sizeof(buffer));
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for (int i = 0; i < sizeof(buffer); ++i) {
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*dest ^= buffer[i];
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++dest;
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}
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len -= sizeof(buffer);
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}
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random_buffer(buffer, len);
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for (int i = 0; i < len; ++i) {
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*dest ^= buffer[i];
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++dest;
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}
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} else
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#endif
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{
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random_buffer((uint8_t *)vstr.buf, len);
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorcrypto_random_bytes_obj, 1,
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2, mod_trezorcrypto_random_bytes);
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/// def shuffle(data: list) -> None:
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/// """
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/// Shuffles items of given list (in-place).
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/// """
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STATIC mp_obj_t mod_trezorcrypto_random_shuffle(mp_obj_t data) {
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size_t count = 0;
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mp_obj_t *items = NULL;
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mp_obj_get_array(data, &count, &items);
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if (count > 256) {
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mp_raise_ValueError("Maximum list size is 256 items");
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}
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if (count <= 1) {
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return mp_const_none;
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}
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// Fisher-Yates shuffle
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mp_obj_t t = 0;
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for (size_t i = count - 1; i >= 1; i--) {
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size_t j = random_uniform(i + 1);
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t = items[i];
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items[i] = items[j];
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items[j] = t;
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_random_shuffle_obj,
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mod_trezorcrypto_random_shuffle);
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#ifdef TREZOR_EMULATOR
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/// def reseed(value: int) -> None:
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/// """
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/// Re-seed the RNG with given value.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_random_reseed(mp_obj_t data) {
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random_reseed(trezor_obj_get_uint(data));
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_random_reseed_obj,
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mod_trezorcrypto_random_reseed);
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#endif
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_random_globals_table[] = {
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{MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_random)},
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{MP_ROM_QSTR(MP_QSTR_uniform),
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MP_ROM_PTR(&mod_trezorcrypto_random_uniform_obj)},
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{MP_ROM_QSTR(MP_QSTR_bytes),
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MP_ROM_PTR(&mod_trezorcrypto_random_bytes_obj)},
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{MP_ROM_QSTR(MP_QSTR_shuffle),
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MP_ROM_PTR(&mod_trezorcrypto_random_shuffle_obj)},
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#ifdef TREZOR_EMULATOR
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{MP_ROM_QSTR(MP_QSTR_reseed),
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MP_ROM_PTR(&mod_trezorcrypto_random_reseed_obj)},
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#endif
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_random_globals,
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mod_trezorcrypto_random_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_random_module = {
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.base = {&mp_type_module},
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.globals = (mp_obj_dict_t *)&mod_trezorcrypto_random_globals,
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};
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