mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-27 01:48:17 +00:00
104 lines
3.8 KiB
C
104 lines
3.8 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 "sha2.h"
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#include "memzero.h"
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/// class Sha256:
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/// '''
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/// SHA256 context.
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/// '''
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typedef struct _mp_obj_Sha256_t {
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mp_obj_base_t base;
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SHA256_CTX ctx;
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} mp_obj_Sha256_t;
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STATIC mp_obj_t mod_trezorcrypto_Sha256_update(mp_obj_t self, mp_obj_t data);
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/// def __init__(self, data: bytes = None) -> None:
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/// '''
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/// Creates a hash context object.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_Sha256_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, 0, 1, false);
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mp_obj_Sha256_t *o = m_new_obj(mp_obj_Sha256_t);
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o->base.type = type;
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sha256_Init(&(o->ctx));
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// constructor called with bytes/str as first parameter
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if (n_args == 1) {
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mod_trezorcrypto_Sha256_update(MP_OBJ_FROM_PTR(o), args[0]);
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}
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return MP_OBJ_FROM_PTR(o);
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}
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/// def update(self, data: bytes) -> None:
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/// '''
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/// Update the hash context with hashed data.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_Sha256_update(mp_obj_t self, mp_obj_t data) {
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mp_obj_Sha256_t *o = MP_OBJ_TO_PTR(self);
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mp_buffer_info_t msg;
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mp_get_buffer_raise(data, &msg, MP_BUFFER_READ);
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if (msg.len > 0) {
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sha256_Update(&(o->ctx), msg.buf, msg.len);
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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_2(mod_trezorcrypto_Sha256_update_obj, mod_trezorcrypto_Sha256_update);
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/// def digest(self) -> bytes:
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/// '''
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/// Returns the digest of hashed data.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_Sha256_digest(mp_obj_t self) {
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mp_obj_Sha256_t *o = MP_OBJ_TO_PTR(self);
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uint8_t out[SHA256_DIGEST_LENGTH];
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SHA256_CTX ctx;
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memcpy(&ctx, &(o->ctx), sizeof(SHA256_CTX));
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sha256_Final(&ctx, out);
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memset(&ctx, 0, sizeof(SHA256_CTX));
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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_Sha256_digest_obj, mod_trezorcrypto_Sha256_digest);
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STATIC mp_obj_t mod_trezorcrypto_Sha256___del__(mp_obj_t self) {
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mp_obj_Sha256_t *o = MP_OBJ_TO_PTR(self);
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memzero(&(o->ctx), sizeof(SHA256_CTX));
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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_Sha256___del___obj, mod_trezorcrypto_Sha256___del__);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_Sha256_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_update), MP_ROM_PTR(&mod_trezorcrypto_Sha256_update_obj) },
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{ MP_ROM_QSTR(MP_QSTR_digest), MP_ROM_PTR(&mod_trezorcrypto_Sha256_digest_obj) },
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{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mod_trezorcrypto_Sha256___del___obj) },
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{ MP_ROM_QSTR(MP_QSTR_block_size), MP_OBJ_NEW_SMALL_INT(SHA256_BLOCK_LENGTH) },
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{ MP_ROM_QSTR(MP_QSTR_digest_size), MP_OBJ_NEW_SMALL_INT(SHA256_DIGEST_LENGTH) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_Sha256_locals_dict, mod_trezorcrypto_Sha256_locals_dict_table);
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STATIC const mp_obj_type_t mod_trezorcrypto_Sha256_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Sha256,
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.make_new = mod_trezorcrypto_Sha256_make_new,
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.locals_dict = (void*)&mod_trezorcrypto_Sha256_locals_dict,
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};
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