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trezor-firmware/embed/extmod/modtrezorcrypto/modtrezorcrypto-blake2b.h

121 lines
4.5 KiB
C

/*
* This file is part of the TREZOR project, https://trezor.io/
*
* Copyright (c) SatoshiLabs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "py/objstr.h"
#include "embed/extmod/trezorobj.h"
#include "blake2b.h"
#include "memzero.h"
/// class Blake2b:
/// '''
/// Blake2b context.
/// '''
typedef struct _mp_obj_Blake2b_t {
mp_obj_base_t base;
BLAKE2B_CTX ctx;
} mp_obj_Blake2b_t;
STATIC mp_obj_t mod_trezorcrypto_Blake2b_update(mp_obj_t self, mp_obj_t data);
/// def __init__(self, data: bytes = None, outlen: int = Blake2b.digest_size, key: bytes = None) -> None:
/// '''
/// Creates a hash context object.
/// '''
STATIC mp_obj_t mod_trezorcrypto_Blake2b_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 0, 3, false);
mp_obj_Blake2b_t *o = m_new_obj(mp_obj_Blake2b_t);
o->base.type = type;
int res = 0;
// constructor called with key argument set
if (n_args == 3) {
size_t outlen = trezor_obj_get_uint(args[1]);
mp_buffer_info_t key;
mp_get_buffer_raise(args[2], &key, MP_BUFFER_READ);
res = blake2b_InitKey(&(o->ctx), outlen, key.buf, key.len);
} else if (n_args == 2) {
size_t outlen = trezor_obj_get_uint(args[1]);
res = blake2b_Init(&(o->ctx), outlen);
} else {
res = blake2b_Init(&(o->ctx), BLAKE2B_DIGEST_LENGTH);
}
if (res < 0) {
mp_raise_ValueError("Invalid Blake2b parameters");
}
// constructor called with data argument set
if (n_args >= 1) {
mod_trezorcrypto_Blake2b_update(MP_OBJ_FROM_PTR(o), args[0]);
}
return MP_OBJ_FROM_PTR(o);
}
/// def update(self, data: bytes) -> None:
/// '''
/// Update the hash context with hashed data.
/// '''
STATIC mp_obj_t mod_trezorcrypto_Blake2b_update(mp_obj_t self, mp_obj_t data) {
mp_obj_Blake2b_t *o = MP_OBJ_TO_PTR(self);
mp_buffer_info_t msg;
mp_get_buffer_raise(data, &msg, MP_BUFFER_READ);
if (msg.len > 0) {
blake2b_Update(&(o->ctx), msg.buf, msg.len);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_Blake2b_update_obj, mod_trezorcrypto_Blake2b_update);
/// def digest(self) -> bytes:
/// '''
/// Returns the digest of hashed data.
/// '''
STATIC mp_obj_t mod_trezorcrypto_Blake2b_digest(mp_obj_t self) {
mp_obj_Blake2b_t *o = MP_OBJ_TO_PTR(self);
uint8_t out[BLAKE2B_DIGEST_LENGTH];
BLAKE2B_CTX ctx;
memcpy(&ctx, &(o->ctx), sizeof(BLAKE2B_CTX));
blake2b_Final(&ctx, out, ctx.outlen);
memset(&ctx, 0, sizeof(BLAKE2B_CTX));
return mp_obj_new_bytes(out, o->ctx.outlen);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_Blake2b_digest_obj, mod_trezorcrypto_Blake2b_digest);
STATIC mp_obj_t mod_trezorcrypto_Blake2b___del__(mp_obj_t self) {
mp_obj_Blake2b_t *o = MP_OBJ_TO_PTR(self);
memzero(&(o->ctx), sizeof(BLAKE2B_CTX));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_Blake2b___del___obj, mod_trezorcrypto_Blake2b___del__);
STATIC const mp_rom_map_elem_t mod_trezorcrypto_Blake2b_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_update), MP_ROM_PTR(&mod_trezorcrypto_Blake2b_update_obj) },
{ MP_ROM_QSTR(MP_QSTR_digest), MP_ROM_PTR(&mod_trezorcrypto_Blake2b_digest_obj) },
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mod_trezorcrypto_Blake2b___del___obj) },
{ MP_ROM_QSTR(MP_QSTR_block_size), MP_OBJ_NEW_SMALL_INT(BLAKE2B_BLOCK_LENGTH) },
{ MP_ROM_QSTR(MP_QSTR_digest_size), MP_OBJ_NEW_SMALL_INT(BLAKE2B_DIGEST_LENGTH) },
};
STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_Blake2b_locals_dict, mod_trezorcrypto_Blake2b_locals_dict_table);
STATIC const mp_obj_type_t mod_trezorcrypto_Blake2b_type = {
{ &mp_type_type },
.name = MP_QSTR_Blake2b,
.make_new = mod_trezorcrypto_Blake2b_make_new,
.locals_dict = (void*)&mod_trezorcrypto_Blake2b_locals_dict,
};