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165 lines
6.2 KiB
165 lines
6.2 KiB
/*
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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 "chacha20poly1305/rfc7539.h"
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#include "memzero.h"
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/// package: trezorcrypto.__init__
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/// class ChaCha20Poly1305:
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/// """
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/// ChaCha20Poly1305 context.
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/// """
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typedef struct _mp_obj_ChaCha20Poly1305_t {
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mp_obj_base_t base;
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chacha20poly1305_ctx ctx;
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int64_t alen, plen;
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} mp_obj_ChaCha20Poly1305_t;
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/// def __init__(self, key: bytes, nonce: bytes) -> None:
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/// """
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/// Initialize the ChaCha20 + Poly1305 context for encryption or decryption
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/// using a 32 byte key and 12 byte nonce as in the RFC 7539 style.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_ChaCha20Poly1305_make_new(
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const mp_obj_type_t *type, 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_obj_ChaCha20Poly1305_t *o = m_new_obj(mp_obj_ChaCha20Poly1305_t);
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o->base.type = type;
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mp_buffer_info_t key, nonce;
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mp_get_buffer_raise(args[0], &key, MP_BUFFER_READ);
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mp_get_buffer_raise(args[1], &nonce, MP_BUFFER_READ);
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if (key.len != 32) {
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mp_raise_ValueError("Invalid length of key");
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}
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if (nonce.len != 12) {
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mp_raise_ValueError("Invalid length of nonce");
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}
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rfc7539_init(&(o->ctx), key.buf, nonce.buf);
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o->alen = 0;
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o->plen = 0;
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return MP_OBJ_FROM_PTR(o);
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}
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/// def encrypt(self, data: bytes) -> bytes:
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/// """
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/// Encrypt data (length of data must be divisible by 64 except for the
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/// final value).
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/// """
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STATIC mp_obj_t mod_trezorcrypto_ChaCha20Poly1305_encrypt(mp_obj_t self,
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mp_obj_t data) {
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mp_obj_ChaCha20Poly1305_t *o = MP_OBJ_TO_PTR(self);
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mp_buffer_info_t in;
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mp_get_buffer_raise(data, &in, MP_BUFFER_READ);
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vstr_t vstr;
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vstr_init_len(&vstr, in.len);
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chacha20poly1305_encrypt(&(o->ctx), in.buf, (uint8_t *)vstr.buf, in.len);
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o->plen += in.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_ChaCha20Poly1305_encrypt_obj,
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mod_trezorcrypto_ChaCha20Poly1305_encrypt);
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/// def decrypt(self, data: bytes) -> bytes:
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/// """
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/// Decrypt data (length of data must be divisible by 64 except for the
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/// final value).
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/// """
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STATIC mp_obj_t mod_trezorcrypto_ChaCha20Poly1305_decrypt(mp_obj_t self,
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mp_obj_t data) {
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mp_obj_ChaCha20Poly1305_t *o = MP_OBJ_TO_PTR(self);
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mp_buffer_info_t in;
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mp_get_buffer_raise(data, &in, MP_BUFFER_READ);
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vstr_t vstr;
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vstr_init_len(&vstr, in.len);
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chacha20poly1305_decrypt(&(o->ctx), in.buf, (uint8_t *)vstr.buf, in.len);
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o->plen += in.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_ChaCha20Poly1305_decrypt_obj,
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mod_trezorcrypto_ChaCha20Poly1305_decrypt);
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/// def auth(self, data: bytes) -> None:
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/// """
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/// Include authenticated data in the Poly1305 MAC using the RFC 7539
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/// style with 16 byte padding. This must only be called once and prior
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/// to encryption or decryption.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_ChaCha20Poly1305_auth(mp_obj_t self,
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mp_obj_t data) {
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mp_obj_ChaCha20Poly1305_t *o = MP_OBJ_TO_PTR(self);
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mp_buffer_info_t in;
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mp_get_buffer_raise(data, &in, MP_BUFFER_READ);
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rfc7539_auth(&(o->ctx), in.buf, in.len);
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o->alen += in.len;
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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_ChaCha20Poly1305_auth_obj,
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mod_trezorcrypto_ChaCha20Poly1305_auth);
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/// def finish(self) -> bytes:
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/// """
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/// Compute RFC 7539-style Poly1305 MAC.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_ChaCha20Poly1305_finish(mp_obj_t self) {
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mp_obj_ChaCha20Poly1305_t *o = MP_OBJ_TO_PTR(self);
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uint8_t out[16];
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rfc7539_finish(&(o->ctx), o->alen, o->plen, out);
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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_ChaCha20Poly1305_finish_obj,
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mod_trezorcrypto_ChaCha20Poly1305_finish);
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STATIC mp_obj_t mod_trezorcrypto_ChaCha20Poly1305___del__(mp_obj_t self) {
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mp_obj_ChaCha20Poly1305_t *o = MP_OBJ_TO_PTR(self);
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memzero(&(o->ctx), sizeof(chacha20poly1305_ctx));
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o->alen = 0;
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o->plen = 0;
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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_ChaCha20Poly1305___del___obj,
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mod_trezorcrypto_ChaCha20Poly1305___del__);
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STATIC const mp_rom_map_elem_t
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mod_trezorcrypto_ChaCha20Poly1305_locals_dict_table[] = {
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{MP_ROM_QSTR(MP_QSTR_encrypt),
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MP_ROM_PTR(&mod_trezorcrypto_ChaCha20Poly1305_encrypt_obj)},
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{MP_ROM_QSTR(MP_QSTR_decrypt),
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MP_ROM_PTR(&mod_trezorcrypto_ChaCha20Poly1305_decrypt_obj)},
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{MP_ROM_QSTR(MP_QSTR_auth),
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MP_ROM_PTR(&mod_trezorcrypto_ChaCha20Poly1305_auth_obj)},
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{MP_ROM_QSTR(MP_QSTR_finish),
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MP_ROM_PTR(&mod_trezorcrypto_ChaCha20Poly1305_finish_obj)},
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{MP_ROM_QSTR(MP_QSTR___del__),
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MP_ROM_PTR(&mod_trezorcrypto_ChaCha20Poly1305___del___obj)},
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};
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STATIC MP_DEFINE_CONST_DICT(
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mod_trezorcrypto_ChaCha20Poly1305_locals_dict,
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mod_trezorcrypto_ChaCha20Poly1305_locals_dict_table);
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STATIC const mp_obj_type_t mod_trezorcrypto_ChaCha20Poly1305_type = {
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{&mp_type_type},
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.name = MP_QSTR_ChaCha20Poly1305,
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.make_new = mod_trezorcrypto_ChaCha20Poly1305_make_new,
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.locals_dict = (void *)&mod_trezorcrypto_ChaCha20Poly1305_locals_dict,
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};
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