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trezor-firmware/embed/extmod/modtrezorcrypto/modtrezorcrypto-rfc6979.h

65 lines
2.1 KiB
C

/*
* Copyright (c) Pavol Rusnak, SatoshiLabs
*
* Licensed under TREZOR License
* see LICENSE file for details
*/
#include "py/objstr.h"
#include "rfc6979.h"
/// class Rfc6979:
/// '''
/// RFC6979 context.
/// '''
typedef struct _mp_obj_Rfc6979_t {
mp_obj_base_t base;
rfc6979_state rng;
} mp_obj_Rfc6979_t;
/// def __init__(self, secret_key: bytes, hash: bytes) -> None:
/// '''
/// Initialize RFC6979 context from secret key and a hash.
/// '''
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) {
mp_arg_check_num(n_args, n_kw, 2, 2, false);
mp_obj_Rfc6979_t *o = m_new_obj(mp_obj_Rfc6979_t);
o->base.type = type;
mp_buffer_info_t pkey, hash;
mp_get_buffer_raise(args[0], &pkey, MP_BUFFER_READ);
mp_get_buffer_raise(args[1], &hash, MP_BUFFER_READ);
if (pkey.len != 32) {
mp_raise_ValueError("Secret key has to be 32 bytes long");
}
if (hash.len != 32) {
mp_raise_ValueError("Hash has to be 32 bytes long");
}
init_rfc6979((const uint8_t *)pkey.buf, (const uint8_t *)hash.buf, &(o->rng));
return MP_OBJ_FROM_PTR(o);
}
/// def next(self) -> bytes:
/// '''
/// Compute next 32-bytes of pseudorandom data.
/// '''
STATIC mp_obj_t mod_trezorcrypto_Rfc6979_next(mp_obj_t self) {
mp_obj_Rfc6979_t *o = MP_OBJ_TO_PTR(self);
uint8_t out[32];
generate_rfc6979(out, &(o->rng));
return mp_obj_new_bytes(out, sizeof(out));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_Rfc6979_next_obj, mod_trezorcrypto_Rfc6979_next);
STATIC const mp_rom_map_elem_t mod_trezorcrypto_Rfc6979_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_next), MP_ROM_PTR(&mod_trezorcrypto_Rfc6979_next_obj) },
};
STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_Rfc6979_locals_dict, mod_trezorcrypto_Rfc6979_locals_dict_table);
STATIC const mp_obj_type_t mod_trezorcrypto_Rfc6979_type = {
{ &mp_type_type },
.name = MP_QSTR_Rfc6979,
.make_new = mod_trezorcrypto_Rfc6979_make_new,
.locals_dict = (void*)&mod_trezorcrypto_Rfc6979_locals_dict,
};