mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-24 07:18:09 +00:00
65 lines
2.1 KiB
C
65 lines
2.1 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 "rfc6979.h"
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/// class Rfc6979:
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/// '''
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/// RFC6979 context.
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/// '''
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typedef struct _mp_obj_Rfc6979_t {
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mp_obj_base_t base;
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rfc6979_state rng;
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} mp_obj_Rfc6979_t;
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/// def __init__(self, secret_key: bytes, hash: bytes) -> None:
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/// '''
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/// Initialize RFC6979 context from secret key and a hash.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_Rfc6979_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, 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_Rfc6979_t *o = m_new_obj(mp_obj_Rfc6979_t);
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o->base.type = type;
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mp_buffer_info_t pkey, hash;
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mp_get_buffer_raise(args[0], &pkey, MP_BUFFER_READ);
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mp_get_buffer_raise(args[1], &hash, MP_BUFFER_READ);
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if (pkey.len != 32) {
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mp_raise_ValueError("Secret key has to be 32 bytes long");
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}
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if (hash.len != 32) {
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mp_raise_ValueError("Hash has to be 32 bytes long");
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}
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init_rfc6979((const uint8_t *)pkey.buf, (const uint8_t *)hash.buf, &(o->rng));
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return MP_OBJ_FROM_PTR(o);
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}
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/// def next(self) -> bytes:
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/// '''
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/// Compute next 32-bytes of pseudorandom data.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_Rfc6979_next(mp_obj_t self) {
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mp_obj_Rfc6979_t *o = MP_OBJ_TO_PTR(self);
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uint8_t out[32];
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generate_rfc6979(out, &(o->rng));
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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_Rfc6979_next_obj, mod_trezorcrypto_Rfc6979_next);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_Rfc6979_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_next), MP_ROM_PTR(&mod_trezorcrypto_Rfc6979_next_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_Rfc6979_locals_dict, mod_trezorcrypto_Rfc6979_locals_dict_table);
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STATIC const mp_obj_type_t mod_trezorcrypto_Rfc6979_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Rfc6979,
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.make_new = mod_trezorcrypto_Rfc6979_make_new,
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.locals_dict = (void*)&mod_trezorcrypto_Rfc6979_locals_dict,
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};
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