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105 lines
3.8 KiB
105 lines
3.8 KiB
/*
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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 "ed25519-donna/ed25519.h"
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#include "rand.h"
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/// package: trezorcrypto.curve25519
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/// def generate_secret() -> bytes:
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/// """
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/// Generate secret key.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_curve25519_generate_secret() {
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vstr_t sk = {0};
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vstr_init_len(&sk, 32);
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random_buffer((uint8_t *)sk.buf, sk.len);
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// taken from https://cr.yp.to/ecdh.html
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sk.buf[0] &= 248;
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sk.buf[31] &= 127;
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sk.buf[31] |= 64;
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &sk);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_0(
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mod_trezorcrypto_curve25519_generate_secret_obj,
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mod_trezorcrypto_curve25519_generate_secret);
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/// def publickey(secret_key: bytes) -> bytes:
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/// """
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/// Computes public key from secret key.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_curve25519_publickey(mp_obj_t secret_key) {
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mp_buffer_info_t sk = {0};
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mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
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if (sk.len != 32) {
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mp_raise_ValueError("Invalid length of secret key");
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}
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vstr_t pk = {0};
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vstr_init_len(&pk, 32);
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curve25519_scalarmult_basepoint((uint8_t *)pk.buf, (const uint8_t *)sk.buf);
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &pk);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_curve25519_publickey_obj,
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mod_trezorcrypto_curve25519_publickey);
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/// def multiply(secret_key: bytes, public_key: bytes) -> bytes:
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/// """
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/// Multiplies point defined by public_key with scalar defined by
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/// secret_key. Useful for ECDH.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_curve25519_multiply(mp_obj_t secret_key,
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mp_obj_t public_key) {
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mp_buffer_info_t sk = {0}, pk = {0};
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mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
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mp_get_buffer_raise(public_key, &pk, MP_BUFFER_READ);
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if (sk.len != 32) {
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mp_raise_ValueError("Invalid length of secret key");
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}
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if (pk.len != 32) {
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mp_raise_ValueError("Invalid length of public key");
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}
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vstr_t out = {0};
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vstr_init_len(&out, 32);
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curve25519_scalarmult((uint8_t *)out.buf, (const uint8_t *)sk.buf,
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(const uint8_t *)pk.buf);
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &out);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_curve25519_multiply_obj,
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mod_trezorcrypto_curve25519_multiply);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_curve25519_globals_table[] = {
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{MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_curve25519)},
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{MP_ROM_QSTR(MP_QSTR_generate_secret),
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MP_ROM_PTR(&mod_trezorcrypto_curve25519_generate_secret_obj)},
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{MP_ROM_QSTR(MP_QSTR_publickey),
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MP_ROM_PTR(&mod_trezorcrypto_curve25519_publickey_obj)},
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{MP_ROM_QSTR(MP_QSTR_multiply),
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MP_ROM_PTR(&mod_trezorcrypto_curve25519_multiply_obj)},
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_curve25519_globals,
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mod_trezorcrypto_curve25519_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_curve25519_module = {
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.base = {&mp_type_module},
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.globals = (mp_obj_dict_t *)&mod_trezorcrypto_curve25519_globals,
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};
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