143 lines
5.7 KiB
C
143 lines
5.7 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 "bip39.h"
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/// def find_word(prefix: str) -> Optional[str]:
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/// '''
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/// Return the first word from the wordlist starting with prefix.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_bip39_find_word(mp_obj_t prefix)
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{
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mp_buffer_info_t pfx;
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mp_get_buffer_raise(prefix, &pfx, MP_BUFFER_READ);
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if (pfx.len == 0) {
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return mp_const_none;
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}
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for (const char * const *w = mnemonic_wordlist(); *w != 0; w++) {
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if (strncmp(*w, pfx.buf, pfx.len) == 0) {
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return mp_obj_new_str(*w, strlen(*w), false);
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}
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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_bip39_find_word_obj, mod_trezorcrypto_bip39_find_word);
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/// def complete_word(prefix: str) -> int:
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/// '''
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/// Return possible 1-letter suffixes for given word prefix.
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/// Result is a bitmask, with 'a' on the lowest bit, 'b' on the second lowest, etc.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_bip39_complete_word(mp_obj_t prefix)
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{
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mp_buffer_info_t pfx;
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mp_get_buffer_raise(prefix, &pfx, MP_BUFFER_READ);
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if (pfx.len == 0) {
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return mp_obj_new_int(0xFFFFFFFF); // all letters
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}
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uint32_t res = 0;
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uint8_t bit;
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const char *word;
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const char *const *wlist;
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for (wlist = mnemonic_wordlist(); *wlist != 0; wlist++) {
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word = *wlist;
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if (strncmp(word, pfx.buf, pfx.len) == 0 && strlen(word) > pfx.len) {
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bit = word[pfx.len] - 'a';
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res |= 1 << bit;
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}
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}
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return mp_obj_new_int(res);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_bip39_complete_word_obj, mod_trezorcrypto_bip39_complete_word);
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/// def generate(strength: int) -> str:
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/// '''
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/// Generate a mnemonic of given strength (128, 160, 192, 224 and 256 bits).
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_bip39_generate(mp_obj_t strength) {
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int bits = mp_obj_get_int(strength);
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if (bits % 32 || bits < 128 || bits > 256) {
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mp_raise_ValueError("Invalid bit strength (only 128, 160, 192, 224 and 256 values are allowed)");
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}
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const char *mnemo = mnemonic_generate(bits);
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return mp_obj_new_str(mnemo, strlen(mnemo), false);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_bip39_generate_obj, mod_trezorcrypto_bip39_generate);
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/// def from_data(data: bytes) -> str:
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/// '''
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/// Generate a mnemonic from given data (of 16, 20, 24, 28 and 32 bytes).
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_bip39_from_data(mp_obj_t data) {
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mp_buffer_info_t bin;
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mp_get_buffer_raise(data, &bin, MP_BUFFER_READ);
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if (bin.len % 4 || bin.len < 16 || bin.len > 32) {
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mp_raise_ValueError("Invalid data length (only 16, 20, 24, 28 and 32 bytes are allowed)");
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}
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const char *mnemo = mnemonic_from_data(bin.buf, bin.len);
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return mp_obj_new_str(mnemo, strlen(mnemo), false);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_bip39_from_data_obj, mod_trezorcrypto_bip39_from_data);
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/// def check(mnemonic: str) -> bool:
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/// '''
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/// Check whether given mnemonic is valid.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_bip39_check(mp_obj_t mnemonic) {
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mp_buffer_info_t text;
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mp_get_buffer_raise(mnemonic, &text, MP_BUFFER_READ);
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return (text.len > 0 && mnemonic_check(text.buf)) ? mp_const_true : mp_const_false;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_bip39_check_obj, mod_trezorcrypto_bip39_check);
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/// def seed(mnemonic: str, passphrase: str) -> bytes:
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/// '''
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/// Generate seed from mnemonic and passphrase.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_bip39_seed(mp_obj_t mnemonic, mp_obj_t passphrase) {
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mp_buffer_info_t mnemo;
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mp_buffer_info_t phrase;
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mp_get_buffer_raise(mnemonic, &mnemo, MP_BUFFER_READ);
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mp_get_buffer_raise(passphrase, &phrase, MP_BUFFER_READ);
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uint8_t seed[64];
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const char *pmnemonic = mnemo.len > 0 ? mnemo.buf : "";
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const char *ppassphrase = phrase.len > 0 ? phrase.buf : "";
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mnemonic_to_seed(pmnemonic, ppassphrase, seed, NULL); // no callback for now
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return mp_obj_new_bytes(seed, sizeof(seed));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_bip39_seed_obj, mod_trezorcrypto_bip39_seed);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_bip39_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_bip39) },
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{ MP_ROM_QSTR(MP_QSTR_find_word), MP_ROM_PTR(&mod_trezorcrypto_bip39_find_word_obj) },
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{ MP_ROM_QSTR(MP_QSTR_complete_word), MP_ROM_PTR(&mod_trezorcrypto_bip39_complete_word_obj) },
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{ MP_ROM_QSTR(MP_QSTR_generate), MP_ROM_PTR(&mod_trezorcrypto_bip39_generate_obj) },
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{ MP_ROM_QSTR(MP_QSTR_from_data), MP_ROM_PTR(&mod_trezorcrypto_bip39_from_data_obj) },
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{ MP_ROM_QSTR(MP_QSTR_check), MP_ROM_PTR(&mod_trezorcrypto_bip39_check_obj) },
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{ MP_ROM_QSTR(MP_QSTR_seed), MP_ROM_PTR(&mod_trezorcrypto_bip39_seed_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_bip39_globals, mod_trezorcrypto_bip39_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_bip39_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mod_trezorcrypto_bip39_globals,
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};
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