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172 lines
5.6 KiB
172 lines
5.6 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 "memzero.h"
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#include "pbkdf2.h"
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#define PRF_HMAC_SHA256 256
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#define PRF_HMAC_SHA512 512
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/// package: trezorcrypto.__init__
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/// class pbkdf2:
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/// """
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/// PBKDF2 context.
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/// """
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/// HMAC_SHA256: int
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/// HMAC_SHA512: int
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typedef struct _mp_obj_Pbkdf2_t {
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mp_obj_base_t base;
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union {
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PBKDF2_HMAC_SHA256_CTX ctx256;
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PBKDF2_HMAC_SHA512_CTX ctx512;
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};
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uint32_t prf;
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} mp_obj_Pbkdf2_t;
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STATIC mp_obj_t mod_trezorcrypto_Pbkdf2_update(mp_obj_t self, mp_obj_t data);
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/// def __init__(
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/// self,
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/// prf: int,
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/// password: bytes,
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/// salt: bytes,
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/// iterations: int = None,
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/// blocknr: int = 1,
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/// ) -> None:
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/// """
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/// Create a PBKDF2 context.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_Pbkdf2_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, 3, 4, false);
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mp_obj_Pbkdf2_t *o = m_new_obj_with_finaliser(mp_obj_Pbkdf2_t);
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o->base.type = type;
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mp_buffer_info_t password;
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mp_get_buffer_raise(args[1], &password, MP_BUFFER_READ);
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mp_buffer_info_t salt;
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mp_get_buffer_raise(args[2], &salt, MP_BUFFER_READ);
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if (password.len == 0) {
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password.buf = "";
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}
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if (salt.len == 0) {
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salt.buf = "";
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}
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uint32_t blocknr = 1;
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if (n_args > 4) { // blocknr is set
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blocknr = trezor_obj_get_uint(args[4]);
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}
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o->prf = trezor_obj_get_uint(args[0]);
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if (o->prf == PRF_HMAC_SHA256) {
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pbkdf2_hmac_sha256_Init(&(o->ctx256), password.buf, password.len, salt.buf,
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salt.len, blocknr);
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} else if (o->prf == PRF_HMAC_SHA512) {
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pbkdf2_hmac_sha512_Init(&(o->ctx512), password.buf, password.len, salt.buf,
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salt.len, blocknr);
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} else {
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mp_raise_ValueError("Invalid PRF");
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}
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// constructor called with iterations as fourth parameter
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if (n_args > 3) {
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mod_trezorcrypto_Pbkdf2_update(MP_OBJ_FROM_PTR(o), args[3]);
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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, iterations: int) -> None:
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/// """
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/// Update a PBKDF2 context.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_Pbkdf2_update(mp_obj_t self,
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mp_obj_t iterations) {
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mp_obj_Pbkdf2_t *o = MP_OBJ_TO_PTR(self);
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uint32_t iter = trezor_obj_get_uint(iterations);
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if (o->prf == PRF_HMAC_SHA256) {
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pbkdf2_hmac_sha256_Update(&(o->ctx256), iter);
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}
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if (o->prf == PRF_HMAC_SHA512) {
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pbkdf2_hmac_sha512_Update(&(o->ctx512), iter);
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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_Pbkdf2_update_obj,
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mod_trezorcrypto_Pbkdf2_update);
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/// def key(self) -> bytes:
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/// """
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/// Retrieve derived key.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_Pbkdf2_key(mp_obj_t self) {
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mp_obj_Pbkdf2_t *o = MP_OBJ_TO_PTR(self);
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if (o->prf == PRF_HMAC_SHA256) {
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PBKDF2_HMAC_SHA256_CTX ctx;
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memcpy(&ctx, &(o->ctx256), sizeof(PBKDF2_HMAC_SHA256_CTX));
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uint8_t out[SHA256_DIGEST_LENGTH];
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pbkdf2_hmac_sha256_Final(&ctx, out);
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memzero(&ctx, sizeof(PBKDF2_HMAC_SHA256_CTX));
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return mp_obj_new_bytes(out, sizeof(out));
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}
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if (o->prf == PRF_HMAC_SHA512) {
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PBKDF2_HMAC_SHA512_CTX ctx;
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memcpy(&ctx, &(o->ctx512), sizeof(PBKDF2_HMAC_SHA512_CTX));
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uint8_t out[SHA512_DIGEST_LENGTH];
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pbkdf2_hmac_sha512_Final(&ctx, out);
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memzero(&ctx, sizeof(PBKDF2_HMAC_SHA512_CTX));
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return mp_obj_new_bytes(out, sizeof(out));
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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_1(mod_trezorcrypto_Pbkdf2_key_obj,
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mod_trezorcrypto_Pbkdf2_key);
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STATIC mp_obj_t mod_trezorcrypto_Pbkdf2___del__(mp_obj_t self) {
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mp_obj_Pbkdf2_t *o = MP_OBJ_TO_PTR(self);
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memzero(&(o->ctx256), sizeof(PBKDF2_HMAC_SHA256_CTX));
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memzero(&(o->ctx512), sizeof(PBKDF2_HMAC_SHA512_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_Pbkdf2___del___obj,
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mod_trezorcrypto_Pbkdf2___del__);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_Pbkdf2_locals_dict_table[] = {
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{MP_ROM_QSTR(MP_QSTR_update),
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MP_ROM_PTR(&mod_trezorcrypto_Pbkdf2_update_obj)},
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{MP_ROM_QSTR(MP_QSTR_key), MP_ROM_PTR(&mod_trezorcrypto_Pbkdf2_key_obj)},
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{MP_ROM_QSTR(MP_QSTR___del__),
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MP_ROM_PTR(&mod_trezorcrypto_Pbkdf2___del___obj)},
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{MP_ROM_QSTR(MP_QSTR_HMAC_SHA256), MP_ROM_INT(PRF_HMAC_SHA256)},
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{MP_ROM_QSTR(MP_QSTR_HMAC_SHA512), MP_ROM_INT(PRF_HMAC_SHA512)},
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_Pbkdf2_locals_dict,
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mod_trezorcrypto_Pbkdf2_locals_dict_table);
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STATIC const mp_obj_type_t mod_trezorcrypto_Pbkdf2_type = {
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{&mp_type_type},
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.name = MP_QSTR_Pbkdf2,
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.make_new = mod_trezorcrypto_Pbkdf2_make_new,
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.locals_dict = (void *)&mod_trezorcrypto_Pbkdf2_locals_dict,
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};
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