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add trezor.crypto.ssss skeleton

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Pavol Rusnak 2016-05-30 17:10:05 +02:00
parent 71b89c748a
commit 9dc4813ec7
No known key found for this signature in database
GPG Key ID: 91F3B339B9A02A3D
3 changed files with 75 additions and 0 deletions
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71
extmod/modtrezorcrypto/modtrezorcrypto-ssss.h Normal file
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@ -0,0 +1,71 @@
/*
* Copyright (c) Pavol Rusnak, SatoshiLabs
*
* Licensed under TREZOR License
* see LICENSE file for details
*/
#include "py/objstr.h"
typedef struct _mp_obj_SSSS_t {
mp_obj_base_t base;
} mp_obj_SSSS_t;
STATIC mp_obj_t mod_TrezorCrypto_SSSS_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, 0, false);
mp_obj_SSSS_t *o = m_new_obj(mp_obj_SSSS_t);
o->base.type = type;
return MP_OBJ_FROM_PTR(o);
}
/// def trezor.crypto.ssss.split(m: int, n: int, secret: bytes) -> tuple
///
/// Split secret to (M of N) shares using Shamir's Secret Sharing Scheme
///
STATIC mp_obj_t mod_TrezorCrypto_SSSS_split(size_t n_args, const mp_obj_t *args) {
mp_int_t m = mp_obj_get_int(args[1]);
mp_int_t n = mp_obj_get_int(args[2]);
mp_buffer_info_t secret;
mp_get_buffer_raise(args[3], &secret, MP_BUFFER_READ);
(void)m;
mp_obj_tuple_t *tuple = MP_OBJ_TO_PTR(mp_obj_new_tuple(n, NULL));
vstr_t vstr[n];
for (int i = 0; i < n; i++) {
vstr_init_len(&vstr[i], secret.len);
memcpy(vstr[i].buf, secret.buf, secret.len);
tuple->items[i] = mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr[i]);
}
return MP_OBJ_FROM_PTR(tuple);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_SSSS_split_obj, 4, 4, mod_TrezorCrypto_SSSS_split);
/// def trezor.crypto.ssss.combine(shares: tuple) -> bytes
///
/// Combine M shares of Shamir's Secret Sharing Scheme into secret
///
STATIC mp_obj_t mod_TrezorCrypto_SSSS_combine(mp_obj_t self, mp_obj_t shares) {
mp_obj_tuple_t *tuple = MP_OBJ_TO_PTR(shares);
mp_int_t m = 0;
mp_int_t n = tuple->len;
for (int i = 0; i < n; i++) {
mp_obj_t share = tuple->items[i];
if (share != mp_const_none) {
m++;
}
}
return tuple->items[0];
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_SSSS_combine_obj, mod_TrezorCrypto_SSSS_combine);
STATIC const mp_rom_map_elem_t mod_TrezorCrypto_SSSS_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_split), MP_ROM_PTR(&mod_TrezorCrypto_SSSS_split_obj) },
{ MP_ROM_QSTR(MP_QSTR_combine), MP_ROM_PTR(&mod_TrezorCrypto_SSSS_combine_obj) },
};
STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_SSSS_locals_dict, mod_TrezorCrypto_SSSS_locals_dict_table);
STATIC const mp_obj_type_t mod_TrezorCrypto_SSSS_type = {
{ &mp_type_type },
.name = MP_QSTR_SSSS,
.make_new = mod_TrezorCrypto_SSSS_make_new,
.locals_dict = (void*)&mod_TrezorCrypto_SSSS_locals_dict,
};

2
extmod/modtrezorcrypto/modtrezorcrypto.c
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@ -25,6 +25,7 @@
#include "modtrezorcrypto-sha512.h"
#include "modtrezorcrypto-sha3-256.h"
#include "modtrezorcrypto-sha3-512.h"
#include "modtrezorcrypto-ssss.h"
STATIC const mp_rom_map_elem_t mp_module_TrezorCrypto_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_TrezorCrypto) },
@ -38,6 +39,7 @@ STATIC const mp_rom_map_elem_t mp_module_TrezorCrypto_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR_Sha512), MP_ROM_PTR(&mod_TrezorCrypto_Sha512_type) },
{ MP_ROM_QSTR(MP_QSTR_Sha3_256), MP_ROM_PTR(&mod_TrezorCrypto_Sha3_256_type) },
{ MP_ROM_QSTR(MP_QSTR_Sha3_512), MP_ROM_PTR(&mod_TrezorCrypto_Sha3_512_type) },
{ MP_ROM_QSTR(MP_QSTR_SSSS), MP_ROM_PTR(&mod_TrezorCrypto_SSSS_type) },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_TrezorCrypto_globals, mp_module_TrezorCrypto_globals_table);

2
src/trezor/crypto/__init__.py
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@ -1,4 +1,6 @@
from TrezorCrypto import Pbkdf2 as pbkdf2
from TrezorCrypto import Bip39
from TrezorCrypto import SSSS
bip39 = Bip39()
ssss = SSSS()