mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-24 15:28:10 +00:00
160 lines
4.9 KiB
C
160 lines
4.9 KiB
C
/**
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* Copyright (c) SatoshiLabs
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdbool.h>
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#include <string.h>
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#include "memzero.h"
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#include "zkp_context.h"
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#include "vendor/secp256k1-zkp/include/secp256k1.h"
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#include "vendor/secp256k1-zkp/include/secp256k1_extrakeys.h"
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#include "vendor/secp256k1-zkp/include/secp256k1_schnorrsig.h"
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#include "zkp_bip340.h"
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// BIP340 Schnorr public key derivation
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// private_key_bytes has 32 bytes
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// public_key_bytes has 32 bytes
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// returns 0 on success
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int zkp_bip340_get_public_key(const uint8_t *private_key_bytes,
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uint8_t *public_key_bytes) {
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int result = 0;
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secp256k1_pubkey pubkey = {0};
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if (result == 0) {
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secp256k1_context *context_writable = zkp_context_acquire_writable();
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if (context_writable) {
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secp256k1_context_writable_randomize(context_writable);
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if (secp256k1_ec_pubkey_create(context_writable, &pubkey,
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private_key_bytes) != 1) {
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result = -1;
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}
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zkp_context_release_writable();
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} else {
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result = -1;
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}
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}
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secp256k1_xonly_pubkey xonly_pubkey = {0};
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const secp256k1_context *context_read_only = zkp_context_get_read_only();
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if (result == 0) {
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if (secp256k1_xonly_pubkey_from_pubkey(context_read_only, &xonly_pubkey,
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NULL, &pubkey) != 1) {
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result = -1;
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}
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}
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memzero(&pubkey, sizeof(pubkey));
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if (result == 0) {
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if (secp256k1_xonly_pubkey_serialize(context_read_only, public_key_bytes,
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&xonly_pubkey) != 1) {
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result = -1;
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}
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}
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memzero(&xonly_pubkey, sizeof(xonly_pubkey));
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return result;
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}
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// BIP340 Schnorr signature signing
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// private_key_bytes has 32 bytes
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// digest has 32 bytes
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// signature_bytes has 64 bytes
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// auxiliary_data has 32 bytes or is NULL
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// returns 0 on success
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int zkp_bip340_sign_digest(const uint8_t *private_key_bytes,
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const uint8_t *digest, uint8_t *signature_bytes,
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uint8_t *auxiliary_data) {
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int result = 0;
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secp256k1_keypair keypair = {0};
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if (result == 0) {
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secp256k1_context *context_writable = zkp_context_acquire_writable();
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if (context_writable) {
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secp256k1_context_writable_randomize(context_writable);
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if (secp256k1_keypair_create(context_writable, &keypair,
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private_key_bytes) != 1) {
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result = -1;
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}
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zkp_context_release_writable();
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} else {
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result = -1;
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}
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}
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if (result == 0) {
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secp256k1_context *context_writable = zkp_context_acquire_writable();
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if (context_writable) {
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secp256k1_context_writable_randomize(context_writable);
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if (secp256k1_schnorrsig_sign(context_writable, signature_bytes, digest,
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&keypair, auxiliary_data) != 1) {
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result = -1;
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}
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zkp_context_release_writable();
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} else {
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result = -1;
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}
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}
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memzero(&keypair, sizeof(keypair));
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return result;
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}
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// BIP340 Schnorr signature verification
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// public_key_bytes has 32 bytes
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// signature_bytes has 64 bytes
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// digest has 32 bytes
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// returns 0 if verification succeeded
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int zkp_bip340_verify_digest(const uint8_t *public_key_bytes,
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const uint8_t *signature_bytes,
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const uint8_t *digest) {
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int result = 0;
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secp256k1_xonly_pubkey xonly_pubkey = {0};
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const secp256k1_context *context_read_only = zkp_context_get_read_only();
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if (result == 0) {
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if (secp256k1_xonly_pubkey_parse(context_read_only, &xonly_pubkey,
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public_key_bytes) != 1) {
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result = 1;
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}
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}
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if (result == 0) {
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if (secp256k1_schnorrsig_verify(context_read_only, signature_bytes, digest,
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32, &xonly_pubkey) != 1) {
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result = 5;
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}
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}
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memzero(&xonly_pubkey, sizeof(xonly_pubkey));
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return result;
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}
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