mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-22 06:18:07 +00:00
91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
/*
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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/obj.h"
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#include "py/objstr.h"
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#include "embed/extmod/trezorobj.h"
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#include "shamir.h"
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#define MAX_SHARE_COUNT 32
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/// def interpolate(shares, x) -> bytes:
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/// '''
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/// Interpolate
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/// '''
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mp_obj_t mod_trezorcrypto_shamir_interpolate(mp_obj_t shares, mp_obj_t x) {
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size_t share_count;
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mp_obj_t *share_items;
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if (!MP_OBJ_IS_TYPE(shares, &mp_type_list)) {
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mp_raise_TypeError("Expected a list.");
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}
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mp_obj_list_get(shares, &share_count, &share_items);
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if (share_count < 1 || share_count > MAX_SHARE_COUNT) {
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mp_raise_ValueError("Invalid number of shares.");
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}
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uint8_t x_uint8 = trezor_obj_get_uint8(x);
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uint8_t share_indices[MAX_SHARE_COUNT];
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const uint8_t *share_values[MAX_SHARE_COUNT];
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size_t value_len = 0;
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for (int i = 0; i < share_count; ++i) {
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if (!MP_OBJ_IS_TYPE(share_items[i], &mp_type_tuple)) {
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mp_raise_TypeError("Expected a tuple.");
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}
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size_t tuple_len;
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mp_obj_t *share;
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mp_obj_tuple_get(share_items[i], &tuple_len, &share);
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if (tuple_len != 2) {
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mp_raise_ValueError("Expected a tuple of length 2.");
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}
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share_indices[i] = trezor_obj_get_uint8(share[0]);
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mp_buffer_info_t value;
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mp_get_buffer_raise(share[1], &value, MP_BUFFER_READ);
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if (value_len == 0) {
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value_len = value.len;
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if (value_len > SHAMIR_MAX_LEN) {
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mp_raise_ValueError("Share value exceeds maximum supported length.");
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}
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}
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if (value.len != value_len) {
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mp_raise_ValueError("All shares must have the same length.");
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}
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share_values[i] = value.buf;
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}
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vstr_t vstr;
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vstr_init_len(&vstr, value_len);
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shamir_interpolate((uint8_t*) vstr.buf, x_uint8, share_indices, share_values, share_count, value_len);
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vstr_cut_tail_bytes(&vstr, vstr_len(&vstr) - value_len);
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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_2(mod_trezorcrypto_shamir_interpolate_obj,
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mod_trezorcrypto_shamir_interpolate);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_shamir_globals_table[] = {
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{MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_shamir)},
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{MP_ROM_QSTR(MP_QSTR_interpolate), MP_ROM_PTR(&mod_trezorcrypto_shamir_interpolate_obj)},
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_shamir_globals,
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mod_trezorcrypto_shamir_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_shamir_module = {
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.base = {&mp_type_module},
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.globals = (mp_obj_dict_t *)&mod_trezorcrypto_shamir_globals,
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};
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