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380 lines
14 KiB
380 lines
14 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 "common.h"
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#include "py/objstr.h"
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#include "vendor/secp256k1-zkp/include/secp256k1.h"
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#include "vendor/secp256k1-zkp/include/secp256k1_ecdh.h"
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#include "vendor/secp256k1-zkp/include/secp256k1_preallocated.h"
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#include "vendor/secp256k1-zkp/include/secp256k1_recovery.h"
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void secp256k1_default_illegal_callback_fn(const char *str, void *data) {
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(void)data;
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mp_raise_ValueError(str);
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return;
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}
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void secp256k1_default_error_callback_fn(const char *str, void *data) {
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(void)data;
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__fatal_error(NULL, str, __FILE__, __LINE__, __func__);
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return;
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}
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/// package: trezorcrypto.secp256k1_zkp
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/// class Context:
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/// """
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/// Owns a secp256k1 context.
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/// Can be allocated once and re-used between subsequent operations.
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/// """
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///
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typedef struct _mp_obj_secp256k1_context_t {
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mp_obj_base_t base;
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secp256k1_context *secp256k1_ctx;
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size_t secp256k1_ctx_size;
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uint8_t secp256k1_ctx_buf[0]; // to be allocate via m_new_obj_var_maybe().
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} mp_obj_secp256k1_context_t;
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/// def __init__(self):
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/// """
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/// Allocate and initialize secp256k1_context.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_secp256k1_context_make_new(
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const mp_obj_type_t *type, size_t n_args, size_t n_kw,
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const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 0, 0, false);
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const size_t secp256k1_ctx_size = secp256k1_context_preallocated_size(
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SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
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mp_obj_secp256k1_context_t *o = m_new_obj_var_maybe(
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mp_obj_secp256k1_context_t, uint8_t, secp256k1_ctx_size);
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if (!o) {
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mp_raise_ValueError("secp256k1_zkp context is too large");
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}
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o->base.type = type;
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o->secp256k1_ctx_size = secp256k1_ctx_size;
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o->secp256k1_ctx = secp256k1_context_preallocated_create(
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o->secp256k1_ctx_buf, SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
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uint8_t rand[32] = {0};
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random_buffer(rand, 32);
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int ret = secp256k1_context_randomize(o->secp256k1_ctx, rand);
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if (ret != 1) {
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mp_raise_msg(&mp_type_RuntimeError, "secp256k1_context_randomize failed");
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}
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return MP_OBJ_FROM_PTR(o);
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}
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/// def __del__(self):
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/// """
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/// Destructor.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_secp256k1_context___del__(mp_obj_t self) {
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mp_obj_secp256k1_context_t *o = MP_OBJ_TO_PTR(self);
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secp256k1_context_preallocated_destroy(o->secp256k1_ctx);
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memzero(o->secp256k1_ctx_buf, o->secp256k1_ctx_size);
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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_secp256k1_context___del___obj,
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mod_trezorcrypto_secp256k1_context___del__);
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/// def size(self):
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/// """
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/// Return the size in bytes of the internal secp256k1_ctx_buf buffer.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_secp256k1_context_size(mp_obj_t self) {
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mp_obj_secp256k1_context_t *o = MP_OBJ_TO_PTR(self);
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return mp_obj_new_int_from_uint(o->secp256k1_ctx_size);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_secp256k1_context_size_obj,
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mod_trezorcrypto_secp256k1_context_size);
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static const secp256k1_context *mod_trezorcrypto_get_secp256k1_context(
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mp_obj_t self) {
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mp_obj_secp256k1_context_t *o = MP_OBJ_TO_PTR(self);
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return o->secp256k1_ctx;
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}
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/// def generate_secret(self) -> 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_secp256k1_zkp_generate_secret(mp_obj_t self) {
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const secp256k1_context *ctx = mod_trezorcrypto_get_secp256k1_context(self);
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uint8_t out[32] = {0};
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for (;;) {
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random_buffer(out, 32);
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// check whether secret > 0 && secret < curve_order
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if (secp256k1_ec_seckey_verify(ctx, out) == 1) {
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break;
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}
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}
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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(
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mod_trezorcrypto_secp256k1_zkp_generate_secret_obj,
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mod_trezorcrypto_secp256k1_zkp_generate_secret);
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/// def publickey(self, secret_key: bytes, compressed: bool = True) -> 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_secp256k1_context_publickey(
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size_t n_args, const mp_obj_t *args) {
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const secp256k1_context *ctx =
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mod_trezorcrypto_get_secp256k1_context(args[0]);
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mp_buffer_info_t sk;
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mp_get_buffer_raise(args[1], &sk, MP_BUFFER_READ);
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secp256k1_pubkey pk;
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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 (!secp256k1_ec_pubkey_create(ctx, &pk, (const unsigned char *)sk.buf)) {
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mp_raise_ValueError("Invalid secret key");
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}
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bool compressed = n_args < 3 || args[2] == mp_const_true;
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uint8_t out[65];
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size_t outlen = sizeof(out);
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secp256k1_ec_pubkey_serialize(
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ctx, out, &outlen, &pk,
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compressed ? SECP256K1_EC_COMPRESSED : SECP256K1_EC_UNCOMPRESSED);
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return mp_obj_new_bytes(out, outlen);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
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mod_trezorcrypto_secp256k1_context_publickey_obj, 2, 3,
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mod_trezorcrypto_secp256k1_context_publickey);
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/// def sign(
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/// self, secret_key: bytes, digest: bytes, compressed: bool = True
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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_secp256k1_context_sign(size_t n_args,
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const mp_obj_t *args) {
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const secp256k1_context *ctx =
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mod_trezorcrypto_get_secp256k1_context(args[0]);
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mp_buffer_info_t sk, dig;
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mp_get_buffer_raise(args[1], &sk, MP_BUFFER_READ);
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mp_get_buffer_raise(args[2], &dig, MP_BUFFER_READ);
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bool compressed = n_args < 4 || args[3] == mp_const_true;
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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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secp256k1_ecdsa_recoverable_signature sig;
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uint8_t out[65];
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int pby;
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if (!secp256k1_ecdsa_sign_recoverable(ctx, &sig, (const uint8_t *)dig.buf,
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(const uint8_t *)sk.buf, NULL, NULL)) {
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mp_raise_ValueError("Signing failed");
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}
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secp256k1_ecdsa_recoverable_signature_serialize_compact(ctx, &out[1], &pby,
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&sig);
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out[0] = 27 + pby + compressed * 4;
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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_VAR_BETWEEN(
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mod_trezorcrypto_secp256k1_context_sign_obj, 3, 4,
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mod_trezorcrypto_secp256k1_context_sign);
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/// def verify(
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/// self, public_key: bytes, signature: bytes, digest: bytes
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/// ) -> 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
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mod_trezorcrypto_secp256k1_context_verify(size_t n_args, const mp_obj_t *args) {
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const secp256k1_context *ctx =
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mod_trezorcrypto_get_secp256k1_context(args[0]);
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mp_buffer_info_t pk, sig, dig;
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mp_get_buffer_raise(args[1], &pk, MP_BUFFER_READ);
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mp_get_buffer_raise(args[2], &sig, MP_BUFFER_READ);
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mp_get_buffer_raise(args[3], &dig, MP_BUFFER_READ);
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if (pk.len != 33 && pk.len != 65) {
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return mp_const_false;
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}
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if (sig.len != 64 && sig.len != 65) {
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return mp_const_false;
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}
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int offset = sig.len - 64;
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if (dig.len != 32) {
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return mp_const_false;
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}
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secp256k1_ecdsa_signature ec_sig;
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if (!secp256k1_ecdsa_signature_parse_compact(
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ctx, &ec_sig, (const uint8_t *)sig.buf + offset)) {
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return mp_const_false;
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}
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secp256k1_pubkey ec_pk;
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if (!secp256k1_ec_pubkey_parse(ctx, &ec_pk, (const uint8_t *)pk.buf,
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pk.len)) {
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return mp_const_false;
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}
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bool ret = (1 == secp256k1_ecdsa_verify(ctx, &ec_sig,
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(const uint8_t *)dig.buf, &ec_pk));
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return mp_obj_new_bool(ret);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
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mod_trezorcrypto_secp256k1_context_verify_obj, 4, 4,
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mod_trezorcrypto_secp256k1_context_verify);
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/// def verify_recover(self, signature: bytes, digest: bytes) -> bytes:
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/// """
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/// Uses signature of the digest to verify the digest and recover the public
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/// key. Returns public key on success, None if the signature is invalid.
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/// """
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STATIC mp_obj_t mod_trezorcrypto_secp256k1_context_verify_recover(
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mp_obj_t self, mp_obj_t signature, mp_obj_t digest) {
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const secp256k1_context *ctx = mod_trezorcrypto_get_secp256k1_context(self);
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mp_buffer_info_t sig, dig;
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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 (sig.len != 65) {
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return mp_const_none;
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}
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if (dig.len != 32) {
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return mp_const_none;
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}
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int recid = ((const uint8_t *)sig.buf)[0] - 27;
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if (recid >= 8) {
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return mp_const_none;
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}
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bool compressed = (recid >= 4);
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recid &= 3;
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secp256k1_ecdsa_recoverable_signature ec_sig;
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if (!secp256k1_ecdsa_recoverable_signature_parse_compact(
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ctx, &ec_sig, (const uint8_t *)sig.buf + 1, recid)) {
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return mp_const_none;
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}
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secp256k1_pubkey pk;
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if (!secp256k1_ecdsa_recover(ctx, &pk, &ec_sig, (const uint8_t *)dig.buf)) {
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return mp_const_none;
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}
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uint8_t out[65];
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size_t pklen = sizeof(out);
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secp256k1_ec_pubkey_serialize(
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ctx, out, &pklen, &pk,
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compressed ? SECP256K1_EC_COMPRESSED : SECP256K1_EC_UNCOMPRESSED);
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return mp_obj_new_bytes(out, pklen);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_3(
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mod_trezorcrypto_secp256k1_context_verify_recover_obj,
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mod_trezorcrypto_secp256k1_context_verify_recover);
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static int secp256k1_ecdh_hash_passthrough(uint8_t *output, const uint8_t *x,
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const uint8_t *y, void *data) {
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output[0] = 0x04;
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memcpy(&output[1], x, 32);
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memcpy(&output[33], y, 32);
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(void)data;
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return 1;
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}
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/// def multiply(self, 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_secp256k1_context_multiply(
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mp_obj_t self, mp_obj_t secret_key, mp_obj_t public_key) {
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const secp256k1_context *ctx = mod_trezorcrypto_get_secp256k1_context(self);
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mp_buffer_info_t sk, pk;
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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 != 33 && pk.len != 65) {
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mp_raise_ValueError("Invalid length of public key");
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}
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secp256k1_pubkey ec_pk;
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if (!secp256k1_ec_pubkey_parse(ctx, &ec_pk, (const uint8_t *)pk.buf,
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pk.len)) {
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mp_raise_ValueError("Invalid public key");
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}
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uint8_t out[65];
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if (!secp256k1_ecdh(ctx, out, &ec_pk, (const uint8_t *)sk.buf,
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secp256k1_ecdh_hash_passthrough, NULL)) {
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mp_raise_ValueError("Multiply failed");
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}
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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_3(
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mod_trezorcrypto_secp256k1_context_multiply_obj,
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mod_trezorcrypto_secp256k1_context_multiply);
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//////////////////////////////////////////////////////////////////////////////
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STATIC const mp_rom_map_elem_t
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mod_trezorcrypto_secp256k1_context_locals_dict_table[] = {
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{MP_ROM_QSTR(MP_QSTR___del__),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context___del___obj)},
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{MP_ROM_QSTR(MP_QSTR_size),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context_size_obj)},
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{MP_ROM_QSTR(MP_QSTR_generate_secret),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_zkp_generate_secret_obj)},
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{MP_ROM_QSTR(MP_QSTR_publickey),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context_publickey_obj)},
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{MP_ROM_QSTR(MP_QSTR_sign),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context_sign_obj)},
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{MP_ROM_QSTR(MP_QSTR_verify),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context_verify_obj)},
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{MP_ROM_QSTR(MP_QSTR_verify_recover),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context_verify_recover_obj)},
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{MP_ROM_QSTR(MP_QSTR_multiply),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context_multiply_obj)},
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};
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STATIC MP_DEFINE_CONST_DICT(
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mod_trezorcrypto_secp256k1_context_locals_dict,
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mod_trezorcrypto_secp256k1_context_locals_dict_table);
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STATIC const mp_obj_type_t mod_trezorcrypto_secp256k1_context_type = {
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{&mp_type_type},
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.name = MP_QSTR_Context,
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.make_new = mod_trezorcrypto_secp256k1_context_make_new,
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.locals_dict = (void *)&mod_trezorcrypto_secp256k1_context_locals_dict,
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};
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STATIC const mp_rom_map_elem_t
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mod_trezorcrypto_secp256k1_zkp_globals_table[] = {
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{MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_secp256k1_zkp)},
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{MP_ROM_QSTR(MP_QSTR_Context),
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MP_ROM_PTR(&mod_trezorcrypto_secp256k1_context_type)},
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_secp256k1_zkp_globals,
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mod_trezorcrypto_secp256k1_zkp_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_secp256k1_zkp_module = {
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.base = {&mp_type_module},
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.globals = (mp_obj_dict_t *)&mod_trezorcrypto_secp256k1_zkp_globals,
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};
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