77 lines
2.7 KiB
C
77 lines
2.7 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/objstr.h"
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#include "rfc6979.h"
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/// class Rfc6979:
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/// '''
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/// RFC6979 context.
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/// '''
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typedef struct _mp_obj_Rfc6979_t {
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mp_obj_base_t base;
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rfc6979_state rng;
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} mp_obj_Rfc6979_t;
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/// def __init__(self, secret_key: bytes, hash: bytes) -> None:
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/// '''
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/// Initialize RFC6979 context from secret key and a hash.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_Rfc6979_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 2, 2, false);
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mp_obj_Rfc6979_t *o = m_new_obj(mp_obj_Rfc6979_t);
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o->base.type = type;
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mp_buffer_info_t pkey, hash;
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mp_get_buffer_raise(args[0], &pkey, MP_BUFFER_READ);
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mp_get_buffer_raise(args[1], &hash, MP_BUFFER_READ);
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if (pkey.len != 32) {
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mp_raise_ValueError("Secret key has to be 32 bytes long");
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}
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if (hash.len != 32) {
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mp_raise_ValueError("Hash has to be 32 bytes long");
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}
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init_rfc6979((const uint8_t *)pkey.buf, (const uint8_t *)hash.buf, &(o->rng));
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return MP_OBJ_FROM_PTR(o);
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}
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/// def next(self) -> bytes:
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/// '''
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/// Compute next 32-bytes of pseudorandom data.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_Rfc6979_next(mp_obj_t self) {
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mp_obj_Rfc6979_t *o = MP_OBJ_TO_PTR(self);
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uint8_t out[32];
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generate_rfc6979(out, &(o->rng));
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return mp_obj_new_bytes(out, sizeof(out));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_Rfc6979_next_obj, mod_trezorcrypto_Rfc6979_next);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_Rfc6979_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_next), MP_ROM_PTR(&mod_trezorcrypto_Rfc6979_next_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_Rfc6979_locals_dict, mod_trezorcrypto_Rfc6979_locals_dict_table);
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STATIC const mp_obj_type_t mod_trezorcrypto_Rfc6979_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Rfc6979,
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.make_new = mod_trezorcrypto_Rfc6979_make_new,
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.locals_dict = (void*)&mod_trezorcrypto_Rfc6979_locals_dict,
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};
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