Andrew Kozlik
2 months ago
committed by
Andrew Kozlik
parent
f1b5617652
commit
703ea32ceb
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/*
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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 "aes/aesgcm.h"
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#include "memzero.h"
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/// package: trezorcrypto.__init__
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/// class aesgcm:
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/// """
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/// AES-GCM context.
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/// """
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typedef struct _mp_obj_AesGcm_t {
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mp_obj_base_t base;
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gcm_ctx ctx;
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enum {
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STATE_INIT,
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STATE_ENCRYPTING,
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STATE_DECRYPTING,
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STATE_FINISHED,
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STATE_FAILED,
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} state;
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} mp_obj_AesGcm_t;
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/// def __init__(self, key: bytes, iv: bytes) -> None:
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/// """
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/// Initialize the AES-GCM context for encryption or decryption.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_AesGcm_make_new(const mp_obj_type_t *type,
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size_t n_args, size_t n_kw,
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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_buffer_info_t key = {0}, iv = {0};
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mp_get_buffer_raise(args[0], &key, MP_BUFFER_READ);
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mp_get_buffer_raise(args[1], &iv, MP_BUFFER_READ);
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if (key.len != 16 && key.len != 24 && key.len != 32) {
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mp_raise_ValueError(
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"Invalid length of key (has to be 128, 192 or 256 bits)");
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}
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mp_obj_AesGcm_t *o = m_new_obj_with_finaliser(mp_obj_AesGcm_t);
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o->base.type = type;
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o->state = STATE_INIT;
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if (gcm_init_and_key(key.buf, key.len, &(o->ctx)) != RETURN_GOOD ||
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gcm_init_message(iv.buf, iv.len, &(o->ctx)) != RETURN_GOOD) {
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m_del_obj(mp_obj_AesGcm_t, o);
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mp_raise_type(&mp_type_RuntimeError);
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}
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return MP_OBJ_FROM_PTR(o);
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}
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/// def reset(self, iv: bytes) -> None:
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/// """
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/// Reset the IV for encryption or decryption.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_AesGcm_reset(mp_obj_t self, mp_obj_t iv) {
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mp_obj_AesGcm_t *o = MP_OBJ_TO_PTR(self);
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mp_buffer_info_t in = {0};
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mp_get_buffer_raise(iv, &in, MP_BUFFER_READ);
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if (gcm_init_message(in.buf, in.len, &(o->ctx)) != RETURN_GOOD) {
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o->state = STATE_FAILED;
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mp_raise_type(&mp_type_RuntimeError);
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}
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o->state = STATE_INIT;
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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_AesGcm_reset_obj,
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mod_trezorcrypto_AesGcm_reset);
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/// def encrypt(self, data: bytes) -> bytes:
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/// """
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/// Encrypt data chunk.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_AesGcm_encrypt(mp_obj_t self, mp_obj_t data) {
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mp_obj_AesGcm_t *o = MP_OBJ_TO_PTR(self);
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if (o->state != STATE_INIT && o->state != STATE_ENCRYPTING) {
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mp_raise_msg(&mp_type_RuntimeError, "Invalid state.");
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}
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o->state = STATE_ENCRYPTING;
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mp_buffer_info_t in = {0};
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mp_get_buffer_raise(data, &in, MP_BUFFER_READ);
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vstr_t vstr = {0};
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vstr_init_len(&vstr, in.len);
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memcpy(vstr.buf, in.buf, in.len);
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if (gcm_encrypt((unsigned char *)vstr.buf, in.len, &(o->ctx)) !=
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RETURN_GOOD) {
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o->state = STATE_FAILED;
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mp_raise_type(&mp_type_RuntimeError);
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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_2(mod_trezorcrypto_AesGcm_encrypt_obj,
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mod_trezorcrypto_AesGcm_encrypt);
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/// def decrypt(self, data: bytes) -> bytes:
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/// """
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/// Decrypt data chunk.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_AesGcm_decrypt(mp_obj_t self, mp_obj_t data) {
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mp_obj_AesGcm_t *o = MP_OBJ_TO_PTR(self);
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if (o->state != STATE_INIT && o->state != STATE_DECRYPTING) {
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mp_raise_msg(&mp_type_RuntimeError, "Invalid state.");
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}
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o->state = STATE_DECRYPTING;
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mp_buffer_info_t in = {0};
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mp_get_buffer_raise(data, &in, MP_BUFFER_READ);
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vstr_t vstr = {0};
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vstr_init_len(&vstr, in.len);
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memcpy(vstr.buf, in.buf, in.len);
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if (gcm_decrypt((unsigned char *)vstr.buf, in.len, &(o->ctx)) !=
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RETURN_GOOD) {
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o->state = STATE_FAILED;
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mp_raise_type(&mp_type_RuntimeError);
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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_2(mod_trezorcrypto_AesGcm_decrypt_obj,
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mod_trezorcrypto_AesGcm_decrypt);
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/// def auth(self, data: bytes) -> None:
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/// """
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/// Include authenticated data chunk in the GCM authentication tag. This can
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/// be called repeatedly to add authenticated data at any point before
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/// finish().
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/// """
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STATIC mp_obj_t mod_trezorcrypto_AesGcm_auth(mp_obj_t self, mp_obj_t data) {
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mp_obj_AesGcm_t *o = MP_OBJ_TO_PTR(self);
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if (o->state != STATE_INIT && o->state != STATE_ENCRYPTING &&
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o->state != STATE_DECRYPTING) {
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mp_raise_msg(&mp_type_RuntimeError, "Invalid state.");
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}
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mp_buffer_info_t in = {0};
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mp_get_buffer_raise(data, &in, MP_BUFFER_READ);
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if (gcm_auth_header(in.buf, in.len, &(o->ctx)) != RETURN_GOOD) {
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o->state = STATE_FAILED;
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mp_raise_type(&mp_type_RuntimeError);
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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_AesGcm_auth_obj,
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mod_trezorcrypto_AesGcm_auth);
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/// def finish(self) -> bytes:
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/// """
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/// Compute GCM authentication tag.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_AesGcm_finish(mp_obj_t self) {
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mp_obj_AesGcm_t *o = MP_OBJ_TO_PTR(self);
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if (o->state != STATE_INIT && o->state != STATE_ENCRYPTING &&
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o->state != STATE_DECRYPTING) {
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mp_raise_msg(&mp_type_RuntimeError, "Invalid state.");
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}
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o->state = STATE_FINISHED;
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vstr_t tag = {0};
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vstr_init_len(&tag, 16);
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if (gcm_compute_tag((unsigned char *)tag.buf, tag.len, &(o->ctx)) !=
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RETURN_GOOD) {
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o->state = STATE_FAILED;
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mp_raise_type(&mp_type_RuntimeError);
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &tag);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_AesGcm_finish_obj,
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mod_trezorcrypto_AesGcm_finish);
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STATIC mp_obj_t mod_trezorcrypto_AesGcm___del__(mp_obj_t self) {
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mp_obj_AesGcm_t *o = MP_OBJ_TO_PTR(self);
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memzero(&(o->ctx), sizeof(gcm_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_AesGcm___del___obj,
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mod_trezorcrypto_AesGcm___del__);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_AesGcm_locals_dict_table[] = {
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{MP_ROM_QSTR(MP_QSTR_reset),
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MP_ROM_PTR(&mod_trezorcrypto_AesGcm_reset_obj)},
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{MP_ROM_QSTR(MP_QSTR_encrypt),
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MP_ROM_PTR(&mod_trezorcrypto_AesGcm_encrypt_obj)},
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{MP_ROM_QSTR(MP_QSTR_decrypt),
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MP_ROM_PTR(&mod_trezorcrypto_AesGcm_decrypt_obj)},
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{MP_ROM_QSTR(MP_QSTR_auth), MP_ROM_PTR(&mod_trezorcrypto_AesGcm_auth_obj)},
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{MP_ROM_QSTR(MP_QSTR_finish),
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MP_ROM_PTR(&mod_trezorcrypto_AesGcm_finish_obj)},
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{MP_ROM_QSTR(MP_QSTR___del__),
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MP_ROM_PTR(&mod_trezorcrypto_AesGcm___del___obj)},
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_AesGcm_locals_dict,
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mod_trezorcrypto_AesGcm_locals_dict_table);
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STATIC const mp_obj_type_t mod_trezorcrypto_AesGcm_type = {
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{&mp_type_type},
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.name = MP_QSTR_AesGcm,
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.make_new = mod_trezorcrypto_AesGcm_make_new,
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.locals_dict = (void *)&mod_trezorcrypto_AesGcm_locals_dict,
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};
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