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268 lines
9.1 KiB
268 lines
9.1 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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#if USE_SECP256K1_ZKP
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#include "py/objstr.h"
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#include "rand.h"
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#include "zkp_bip340.h"
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/// package: trezorcrypto.bip340
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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_bip340_generate_secret() {
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vstr_t sk = {0};
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vstr_init_len(&sk, 32);
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for (;;) {
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random_buffer((uint8_t *)sk.buf, sk.len);
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// check whether secret > 0 && secret < curve_order
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if (0 ==
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memcmp(
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sk.buf,
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
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32))
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continue;
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if (0 <=
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memcmp(
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sk.buf,
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"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE"
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"\xBA\xAE\xDC\xE6\xAF\x48\xA0\x3B\xBF\xD2\x5E\x8C\xD0\x36\x41\x41",
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32))
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continue;
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break;
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}
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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(mod_trezorcrypto_bip340_generate_secret_obj,
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mod_trezorcrypto_bip340_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_bip340_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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int ret =
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zkp_bip340_get_public_key((const uint8_t *)sk.buf, (uint8_t *)pk.buf);
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if (0 != ret) {
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vstr_clear(&pk);
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mp_raise_ValueError("Invalid secret key");
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}
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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_bip340_publickey_obj,
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mod_trezorcrypto_bip340_publickey);
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/// def sign(
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/// secret_key: bytes,
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/// digest: bytes,
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/// ) -> bytes:
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/// """
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/// Uses secret key to produce the signature of the digest.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_bip340_sign(mp_obj_t secret_key,
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mp_obj_t digest) {
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mp_buffer_info_t sk = {0}, dig = {0};
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mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
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mp_get_buffer_raise(digest, &dig, 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 (dig.len != 32) {
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mp_raise_ValueError("Invalid length of digest");
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}
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vstr_t sig = {0};
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vstr_init_len(&sig, 64);
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int ret =
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zkp_bip340_sign_digest((const uint8_t *)sk.buf, (const uint8_t *)dig.buf,
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(uint8_t *)sig.buf, NULL);
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if (0 != ret) {
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vstr_clear(&sig);
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mp_raise_ValueError("Signing failed");
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &sig);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_bip340_sign_obj,
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mod_trezorcrypto_bip340_sign);
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/// def verify_publickey(public_key: bytes) -> bool:
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/// """
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/// Verifies whether the public key is valid.
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/// Returns True on success.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_bip340_verify_publickey(mp_obj_t public_key) {
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mp_buffer_info_t pk = {0};
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mp_get_buffer_raise(public_key, &pk, MP_BUFFER_READ);
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if (pk.len != 32) {
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return mp_const_false;
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}
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int ret = zkp_bip340_verify_publickey((const uint8_t *)pk.buf);
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return mp_obj_new_bool(ret == 0);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_bip340_verify_publickey_obj,
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mod_trezorcrypto_bip340_verify_publickey);
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/// def verify(public_key: bytes, signature: bytes, digest: bytes) -> bool:
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/// """
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/// Uses public key to verify the signature of the digest.
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/// Returns True on success.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_bip340_verify(mp_obj_t public_key,
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mp_obj_t signature,
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mp_obj_t digest) {
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mp_buffer_info_t pk = {0}, sig = {0}, dig = {0};
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mp_get_buffer_raise(public_key, &pk, MP_BUFFER_READ);
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mp_get_buffer_raise(signature, &sig, MP_BUFFER_READ);
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mp_get_buffer_raise(digest, &dig, MP_BUFFER_READ);
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if (pk.len != 32) {
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return mp_const_false;
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}
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if (sig.len != 64) {
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return mp_const_false;
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}
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if (dig.len != 32) {
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return mp_const_false;
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}
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int ret = zkp_bip340_verify_digest((const uint8_t *)pk.buf,
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(const uint8_t *)sig.buf,
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(const uint8_t *)dig.buf);
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return mp_obj_new_bool(ret == 0);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorcrypto_bip340_verify_obj,
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mod_trezorcrypto_bip340_verify);
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/// def tweak_public_key(
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/// public_key: bytes,
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/// root_hash: bytes | None = None,
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/// ) -> bytes:
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/// """
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/// Tweaks the public key with the specified root_hash.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_bip340_tweak_public_key(size_t n_args,
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const mp_obj_t *args) {
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mp_buffer_info_t pk = {0};
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mp_get_buffer_raise(args[0], &pk, MP_BUFFER_READ);
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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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mp_buffer_info_t rh = {0};
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const uint8_t *rh_ptr = NULL;
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if (n_args > 1 && args[1] != mp_const_none) {
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mp_get_buffer_raise(args[1], &rh, MP_BUFFER_READ);
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if (rh.len != 32) {
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mp_raise_ValueError("Invalid length of root hash");
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}
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rh_ptr = (const uint8_t *)rh.buf;
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}
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vstr_t tpk = {0};
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vstr_init_len(&tpk, 32);
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int ret = zkp_bip340_tweak_public_key((const uint8_t *)pk.buf, rh_ptr,
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(uint8_t *)tpk.buf);
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if (ret != 0) {
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vstr_clear(&tpk);
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mp_raise_ValueError("Failed to tweak public key");
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &tpk);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
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mod_trezorcrypto_bip340_tweak_public_key_obj, 1, 2,
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mod_trezorcrypto_bip340_tweak_public_key);
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/// def tweak_secret_key(
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/// secret_key: bytes,
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/// root_hash: bytes | None = None,
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/// ) -> bytes:
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/// """
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/// Tweaks the secret key with the specified root_hash.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_bip340_tweak_secret_key(size_t n_args,
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const mp_obj_t *args) {
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mp_buffer_info_t sk = {0};
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mp_get_buffer_raise(args[0], &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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mp_buffer_info_t rh = {0};
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const uint8_t *rh_ptr = NULL;
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if (n_args > 1 && args[1] != mp_const_none) {
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mp_get_buffer_raise(args[1], &rh, MP_BUFFER_READ);
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if (rh.len != 32) {
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mp_raise_ValueError("Invalid length of root hash");
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}
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rh_ptr = (const uint8_t *)rh.buf;
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}
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vstr_t tsk = {0};
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vstr_init_len(&tsk, 32);
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int ret = zkp_bip340_tweak_private_key((const uint8_t *)sk.buf, rh_ptr,
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(uint8_t *)tsk.buf);
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if (ret != 0) {
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vstr_clear(&tsk);
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mp_raise_ValueError("Failed to tweak secret key");
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &tsk);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
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mod_trezorcrypto_bip340_tweak_secret_key_obj, 1, 2,
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mod_trezorcrypto_bip340_tweak_secret_key);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_bip340_globals_table[] = {
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{MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_bip340)},
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{MP_ROM_QSTR(MP_QSTR_generate_secret),
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MP_ROM_PTR(&mod_trezorcrypto_bip340_generate_secret_obj)},
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{MP_ROM_QSTR(MP_QSTR_publickey),
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MP_ROM_PTR(&mod_trezorcrypto_bip340_publickey_obj)},
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{MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_trezorcrypto_bip340_sign_obj)},
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{MP_ROM_QSTR(MP_QSTR_verify_publickey),
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MP_ROM_PTR(&mod_trezorcrypto_bip340_verify_publickey_obj)},
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{MP_ROM_QSTR(MP_QSTR_verify),
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MP_ROM_PTR(&mod_trezorcrypto_bip340_verify_obj)},
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{MP_ROM_QSTR(MP_QSTR_tweak_public_key),
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MP_ROM_PTR(&mod_trezorcrypto_bip340_tweak_public_key_obj)},
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{MP_ROM_QSTR(MP_QSTR_tweak_secret_key),
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MP_ROM_PTR(&mod_trezorcrypto_bip340_tweak_secret_key_obj)}};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_bip340_globals,
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mod_trezorcrypto_bip340_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_bip340_module = {
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.base = {&mp_type_module},
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.globals = (mp_obj_dict_t *)&mod_trezorcrypto_bip340_globals,
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};
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#endif
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