mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-23 16:08:17 +00:00
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/*
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* Copyright (c) Pavol Rusnak, SatoshiLabs
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*
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* Licensed under TREZOR License
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* see LICENSE file for details
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*/
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#include "py/objstr.h"
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#include "rand.h"
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/// def uniform(n: int) -> int:
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/// '''
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/// Compute uniform random number from interval 0 ... n - 1.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_random_uniform(mp_obj_t n) {
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uint32_t nn = mp_obj_get_int_truncated(n);
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if (nn == 0) {
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mp_raise_ValueError("Maximum can't be zero");
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}
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return mp_obj_new_int_from_uint(random_uniform(nn));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_random_uniform_obj, mod_trezorcrypto_random_uniform);
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/// def bytes(len: int) -> bytes:
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/// '''
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/// Generate random bytes sequence of length len.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_random_bytes(mp_obj_t len) {
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uint32_t l = mp_obj_get_int(len);
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if (l > 1024) {
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mp_raise_ValueError("Maximum requested size is 1024");
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}
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vstr_t vstr;
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vstr_init_len(&vstr, l);
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random_buffer((uint8_t *)vstr.buf, l);
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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_1(mod_trezorcrypto_random_bytes_obj, mod_trezorcrypto_random_bytes);
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/// def shuffle(data: list) -> None:
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/// '''
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/// Shuffles items of given list (in-place).
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_random_shuffle(mp_obj_t data) {
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size_t count;
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mp_obj_t *items;
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mp_obj_get_array(data, &count, &items);
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if (count > 256) {
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mp_raise_ValueError("Maximum list size is 256 items");
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}
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if (count <= 1) {
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return mp_const_none;
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}
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// Fisher-Yates shuffle
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mp_obj_t t;
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for (size_t i = count - 1; i >= 1; i--) {
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size_t j = random_uniform(i + 1);
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t = items[i];
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items[i] = items[j];
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items[j] = t;
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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_random_shuffle_obj, mod_trezorcrypto_random_shuffle);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_random_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_random) },
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{ MP_ROM_QSTR(MP_QSTR_uniform), MP_ROM_PTR(&mod_trezorcrypto_random_uniform_obj) },
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{ MP_ROM_QSTR(MP_QSTR_bytes), MP_ROM_PTR(&mod_trezorcrypto_random_bytes_obj) },
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{ MP_ROM_QSTR(MP_QSTR_shuffle), MP_ROM_PTR(&mod_trezorcrypto_random_shuffle_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_random_globals, mod_trezorcrypto_random_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_random_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mod_trezorcrypto_random_globals,
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};
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