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774 lines
20 KiB
774 lines
20 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) 2016 Alex Beregszaszi <alex@rtfs.hu>
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* Copyright (C) 2016 Pavol Rusnak <stick@satoshilabs.com>
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* Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ethereum.h"
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#include "fsm.h"
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#include "layout2.h"
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#include "messages.h"
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#include "transaction.h"
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#include "ecdsa.h"
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#include "protect.h"
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#include "crypto.h"
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#include "secp256k1.h"
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#include "sha3.h"
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#include "address.h"
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#include "util.h"
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#include "gettext.h"
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#include "ethereum_tokens.h"
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#include "ethereum_networks.h"
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#include "memzero.h"
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#include "messages.pb.h"
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/* maximum supported chain id. v must fit in an uint32_t. */
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#define MAX_CHAIN_ID 2147483629
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static bool ethereum_signing = false;
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static uint32_t data_total, data_left;
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static EthereumTxRequest msg_tx_request;
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static CONFIDENTIAL uint8_t privkey[32];
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static uint32_t chain_id;
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static uint32_t tx_type;
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struct SHA3_CTX keccak_ctx;
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static inline void hash_data(const uint8_t *buf, size_t size)
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{
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sha3_Update(&keccak_ctx, buf, size);
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}
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/*
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* Push an RLP encoded length to the hash buffer.
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*/
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static void hash_rlp_length(uint32_t length, uint8_t firstbyte)
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{
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uint8_t buf[4];
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if (length == 1 && firstbyte <= 0x7f) {
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/* empty length header */
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} else if (length <= 55) {
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buf[0] = 0x80 + length;
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hash_data(buf, 1);
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} else if (length <= 0xff) {
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buf[0] = 0xb7 + 1;
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buf[1] = length;
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hash_data(buf, 2);
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} else if (length <= 0xffff) {
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buf[0] = 0xb7 + 2;
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buf[1] = length >> 8;
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buf[2] = length & 0xff;
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hash_data(buf, 3);
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} else {
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buf[0] = 0xb7 + 3;
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buf[1] = length >> 16;
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buf[2] = length >> 8;
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buf[3] = length & 0xff;
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hash_data(buf, 4);
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}
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}
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/*
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* Push an RLP encoded list length to the hash buffer.
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*/
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static void hash_rlp_list_length(uint32_t length)
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{
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uint8_t buf[4];
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if (length <= 55) {
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buf[0] = 0xc0 + length;
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hash_data(buf, 1);
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} else if (length <= 0xff) {
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buf[0] = 0xf7 + 1;
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buf[1] = length;
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hash_data(buf, 2);
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} else if (length <= 0xffff) {
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buf[0] = 0xf7 + 2;
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buf[1] = length >> 8;
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buf[2] = length & 0xff;
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hash_data(buf, 3);
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} else {
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buf[0] = 0xf7 + 3;
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buf[1] = length >> 16;
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buf[2] = length >> 8;
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buf[3] = length & 0xff;
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hash_data(buf, 4);
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}
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}
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/*
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* Push an RLP encoded length field and data to the hash buffer.
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*/
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static void hash_rlp_field(const uint8_t *buf, size_t size)
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{
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hash_rlp_length(size, buf[0]);
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hash_data(buf, size);
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}
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/*
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* Push an RLP encoded number to the hash buffer.
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* Ethereum yellow paper says to convert to big endian and strip leading zeros.
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*/
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static void hash_rlp_number(uint32_t number)
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{
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if (!number) {
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return;
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}
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uint8_t data[4];
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data[0] = (number >> 24) & 0xff;
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data[1] = (number >> 16) & 0xff;
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data[2] = (number >> 8) & 0xff;
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data[3] = (number) & 0xff;
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int offset = 0;
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while (!data[offset]) {
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offset++;
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}
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hash_rlp_field(data + offset, 4 - offset);
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}
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/*
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* Calculate the number of bytes needed for an RLP length header.
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* NOTE: supports up to 16MB of data (how unlikely...)
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* FIXME: improve
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*/
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static int rlp_calculate_length(int length, uint8_t firstbyte)
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{
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if (length == 1 && firstbyte <= 0x7f) {
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return 1;
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} else if (length <= 55) {
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return 1 + length;
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} else if (length <= 0xff) {
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return 2 + length;
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} else if (length <= 0xffff) {
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return 3 + length;
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} else {
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return 4 + length;
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}
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}
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static int rlp_calculate_number_length(uint32_t number)
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{
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if (number <= 0x7f) {
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return 1;
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}
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else if (number <= 0xff) {
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return 2;
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}
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else if (number <= 0xffff) {
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return 3;
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}
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else if (number <= 0xffffff) {
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return 4;
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} else {
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return 5;
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}
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}
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static void send_request_chunk(void)
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{
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int progress = 1000 - (data_total > 1000000
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? data_left / (data_total/800)
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: data_left * 800 / data_total);
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layoutProgress(_("Signing"), progress);
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msg_tx_request.has_data_length = true;
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msg_tx_request.data_length = data_left <= 1024 ? data_left : 1024;
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msg_write(MessageType_MessageType_EthereumTxRequest, &msg_tx_request);
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}
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static int ethereum_is_canonic(uint8_t v, uint8_t signature[64])
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{
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(void) signature;
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return (v & 2) == 0;
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}
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static void send_signature(void)
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{
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uint8_t hash[32], sig[64];
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uint8_t v;
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layoutProgress(_("Signing"), 1000);
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/* eip-155 replay protection */
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if (chain_id) {
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/* hash v=chain_id, r=0, s=0 */
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hash_rlp_number(chain_id);
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hash_rlp_length(0, 0);
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hash_rlp_length(0, 0);
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}
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keccak_Final(&keccak_ctx, hash);
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if (ecdsa_sign_digest(&secp256k1, privkey, hash, sig, &v, ethereum_is_canonic) != 0) {
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fsm_sendFailure(FailureType_Failure_ProcessError, _("Signing failed"));
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ethereum_signing_abort();
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return;
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}
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memzero(privkey, sizeof(privkey));
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/* Send back the result */
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msg_tx_request.has_data_length = false;
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msg_tx_request.has_signature_v = true;
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if (chain_id > MAX_CHAIN_ID) {
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msg_tx_request.signature_v = v;
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} else if (chain_id) {
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msg_tx_request.signature_v = v + 2 * chain_id + 35;
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} else {
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msg_tx_request.signature_v = v + 27;
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}
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msg_tx_request.has_signature_r = true;
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msg_tx_request.signature_r.size = 32;
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memcpy(msg_tx_request.signature_r.bytes, sig, 32);
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msg_tx_request.has_signature_s = true;
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msg_tx_request.signature_s.size = 32;
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memcpy(msg_tx_request.signature_s.bytes, sig + 32, 32);
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msg_write(MessageType_MessageType_EthereumTxRequest, &msg_tx_request);
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ethereum_signing_abort();
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}
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/* Format a 256 bit number (amount in wei) into a human readable format
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* using standard ethereum units.
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* The buffer must be at least 25 bytes.
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*/
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static void ethereumFormatAmount(const bignum256 *amnt, const TokenType *token, char *buf, int buflen)
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{
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bignum256 bn1e9;
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bn_read_uint32(1000000000, &bn1e9);
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const char *suffix = NULL;
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int decimals = 18;
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if (token == UnknownToken) {
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strlcpy(buf, "Unknown token value", buflen);
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return;
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} else
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if (token != NULL) {
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suffix = token->ticker;
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decimals = token->decimals;
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} else
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if (bn_is_less(amnt, &bn1e9)) {
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suffix = " Wei";
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decimals = 0;
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} else {
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if (tx_type == 1 || tx_type == 6) {
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suffix = " WAN";
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} else {
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ASSIGN_ETHEREUM_SUFFIX(suffix, chain_id);
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}
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}
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bn_format(amnt, NULL, suffix, decimals, 0, false, buf, buflen);
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}
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static void layoutEthereumConfirmTx(const uint8_t *to, uint32_t to_len, const uint8_t *value, uint32_t value_len, const TokenType *token)
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{
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bignum256 val;
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uint8_t pad_val[32];
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memzero(pad_val, sizeof(pad_val));
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memcpy(pad_val + (32 - value_len), value, value_len);
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bn_read_be(pad_val, &val);
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char amount[32];
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if (token == NULL) {
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if (bn_is_zero(&val)) {
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strcpy(amount, _("message"));
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} else {
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ethereumFormatAmount(&val, NULL, amount, sizeof(amount));
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}
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} else {
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ethereumFormatAmount(&val, token, amount, sizeof(amount));
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}
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char _to1[] = "to 0x__________";
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char _to2[] = "_______________";
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char _to3[] = "_______________?";
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if (to_len) {
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char to_str[41];
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bool rskip60 = false;
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// constants from trezor-common/defs/ethereum/networks.json
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switch (chain_id) {
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case 30: rskip60 = true; break;
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case 31: rskip60 = true; break;
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}
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ethereum_address_checksum(to, to_str, rskip60, chain_id);
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memcpy(_to1 + 5, to_str, 10);
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memcpy(_to2, to_str + 10, 15);
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memcpy(_to3, to_str + 25, 15);
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} else {
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strlcpy(_to1, _("to new contract?"), sizeof(_to1));
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strlcpy(_to2, "", sizeof(_to2));
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strlcpy(_to3, "", sizeof(_to3));
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}
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layoutDialogSwipe(&bmp_icon_question,
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_("Cancel"),
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_("Confirm"),
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NULL,
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_("Send"),
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amount,
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_to1,
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_to2,
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_to3,
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NULL
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);
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}
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static void layoutEthereumData(const uint8_t *data, uint32_t len, uint32_t total_len)
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{
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char hexdata[3][17];
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char summary[20];
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uint32_t printed = 0;
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for (int i = 0; i < 3; i++) {
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uint32_t linelen = len - printed;
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if (linelen > 8) {
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linelen = 8;
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}
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data2hex(data, linelen, hexdata[i]);
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data += linelen;
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printed += linelen;
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}
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strcpy(summary, "... bytes");
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char *p = summary + 11;
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uint32_t number = total_len;
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while (number > 0) {
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*p-- = '0' + number % 10;
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number = number / 10;
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}
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char *summarystart = summary;
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if (total_len == printed)
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summarystart = summary + 4;
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layoutDialogSwipe(&bmp_icon_question,
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_("Cancel"),
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_("Confirm"),
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NULL,
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_("Transaction data:"),
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hexdata[0],
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hexdata[1],
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hexdata[2],
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summarystart,
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NULL
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);
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}
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static void layoutEthereumFee(const uint8_t *value, uint32_t value_len,
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const uint8_t *gas_price, uint32_t gas_price_len,
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const uint8_t *gas_limit, uint32_t gas_limit_len,
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bool is_token)
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{
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bignum256 val, gas;
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uint8_t pad_val[32];
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char tx_value[32];
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char gas_value[32];
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memzero(pad_val, sizeof(pad_val));
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memcpy(pad_val + (32 - gas_price_len), gas_price, gas_price_len);
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bn_read_be(pad_val, &val);
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memzero(pad_val, sizeof(pad_val));
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memcpy(pad_val + (32 - gas_limit_len), gas_limit, gas_limit_len);
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bn_read_be(pad_val, &gas);
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bn_multiply(&val, &gas, &secp256k1.prime);
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ethereumFormatAmount(&gas, NULL, gas_value, sizeof(gas_value));
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memzero(pad_val, sizeof(pad_val));
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memcpy(pad_val + (32 - value_len), value, value_len);
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bn_read_be(pad_val, &val);
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if (bn_is_zero(&val)) {
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strcpy(tx_value, is_token ? _("token") : _("message"));
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} else {
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ethereumFormatAmount(&val, NULL, tx_value, sizeof(tx_value));
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}
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layoutDialogSwipe(&bmp_icon_question,
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_("Cancel"),
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_("Confirm"),
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NULL,
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_("Really send"),
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tx_value,
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_("paying up to"),
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gas_value,
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_("for gas?"),
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NULL
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);
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}
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/*
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* RLP fields:
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* - nonce (0 .. 32)
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* - gas_price (0 .. 32)
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* - gas_limit (0 .. 32)
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* - to (0, 20)
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* - value (0 .. 32)
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* - data (0 ..)
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*/
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static bool ethereum_signing_check(const EthereumSignTx *msg)
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{
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if (!msg->has_gas_price || !msg->has_gas_limit) {
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return false;
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}
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size_t tolen = msg->has_to ? strlen(msg->to) : 0;
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if (tolen != 42 && tolen != 40 && tolen != 0) {
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/* Address has wrong length */
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return false;
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}
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// sending transaction to address 0 (contract creation) without a data field
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if (tolen == 0 && (!msg->has_data_length || msg->data_length == 0)) {
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return false;
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}
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if (msg->gas_price.size + msg->gas_limit.size > 30) {
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// sanity check that fee doesn't overflow
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return false;
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}
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return true;
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}
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void ethereum_signing_init(EthereumSignTx *msg, const HDNode *node)
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{
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ethereum_signing = true;
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sha3_256_Init(&keccak_ctx);
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memzero(&msg_tx_request, sizeof(EthereumTxRequest));
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/* set fields to 0, to avoid conditions later */
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if (!msg->has_value)
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msg->value.size = 0;
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if (!msg->has_data_initial_chunk)
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msg->data_initial_chunk.size = 0;
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bool toset;
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uint8_t pubkeyhash[20];
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if (msg->has_to && ethereum_parse(msg->to, pubkeyhash)) {
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toset = true;
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} else {
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msg->to[0] = 0;
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toset = false;
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memzero(pubkeyhash, sizeof(pubkeyhash));
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}
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if (!msg->has_nonce)
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msg->nonce.size = 0;
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/* eip-155 chain id */
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if (msg->has_chain_id) {
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if (msg->chain_id < 1) {
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fsm_sendFailure(FailureType_Failure_DataError, _("Chain Id out of bounds"));
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ethereum_signing_abort();
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return;
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}
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chain_id = msg->chain_id;
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} else {
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chain_id = 0;
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}
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/* Wanchain txtype */
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if (msg->has_tx_type) {
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if (msg->tx_type == 1 || msg->tx_type == 6) {
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tx_type = msg->tx_type;
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} else {
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fsm_sendFailure(FailureType_Failure_DataError, _("Txtype out of bounds"));
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ethereum_signing_abort();
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return;
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}
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} else {
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tx_type = 0;
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}
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if (msg->has_data_length && msg->data_length > 0) {
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if (!msg->has_data_initial_chunk || msg->data_initial_chunk.size == 0) {
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fsm_sendFailure(FailureType_Failure_DataError, _("Data length provided, but no initial chunk"));
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ethereum_signing_abort();
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return;
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}
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/* Our encoding only supports transactions up to 2^24 bytes. To
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* prevent exceeding the limit we use a stricter limit on data length.
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*/
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if (msg->data_length > 16000000) {
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fsm_sendFailure(FailureType_Failure_DataError, _("Data length exceeds limit"));
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ethereum_signing_abort();
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return;
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}
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data_total = msg->data_length;
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} else {
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data_total = 0;
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}
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if (msg->data_initial_chunk.size > data_total) {
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fsm_sendFailure(FailureType_Failure_DataError, _("Invalid size of initial chunk"));
|
|
ethereum_signing_abort();
|
|
return;
|
|
}
|
|
|
|
// safety checks
|
|
if (!ethereum_signing_check(msg)) {
|
|
fsm_sendFailure(FailureType_Failure_DataError, _("Safety check failed"));
|
|
ethereum_signing_abort();
|
|
return;
|
|
}
|
|
|
|
const TokenType *token = NULL;
|
|
|
|
// detect ERC-20 token
|
|
if (toset && msg->value.size == 0 && data_total == 68 && msg->data_initial_chunk.size == 68
|
|
&& memcmp(msg->data_initial_chunk.bytes, "\xa9\x05\x9c\xbb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16) == 0) {
|
|
token = tokenByChainAddress(chain_id, pubkeyhash);
|
|
}
|
|
|
|
if (token != NULL) {
|
|
layoutEthereumConfirmTx(msg->data_initial_chunk.bytes + 16, 20, msg->data_initial_chunk.bytes + 36, 32, token);
|
|
} else {
|
|
layoutEthereumConfirmTx(pubkeyhash, 20, msg->value.bytes, msg->value.size, NULL);
|
|
}
|
|
|
|
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
|
|
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
|
|
ethereum_signing_abort();
|
|
return;
|
|
}
|
|
|
|
if (token == NULL && data_total > 0) {
|
|
layoutEthereumData(msg->data_initial_chunk.bytes, msg->data_initial_chunk.size, data_total);
|
|
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
|
|
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
|
|
ethereum_signing_abort();
|
|
return;
|
|
}
|
|
}
|
|
|
|
layoutEthereumFee(msg->value.bytes, msg->value.size,
|
|
msg->gas_price.bytes, msg->gas_price.size,
|
|
msg->gas_limit.bytes, msg->gas_limit.size, token != NULL);
|
|
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
|
|
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
|
|
ethereum_signing_abort();
|
|
return;
|
|
}
|
|
|
|
/* Stage 1: Calculate total RLP length */
|
|
uint32_t rlp_length = 0;
|
|
|
|
layoutProgress(_("Signing"), 0);
|
|
|
|
rlp_length += rlp_calculate_length(msg->nonce.size, msg->nonce.bytes[0]);
|
|
rlp_length += rlp_calculate_length(msg->gas_price.size, msg->gas_price.bytes[0]);
|
|
rlp_length += rlp_calculate_length(msg->gas_limit.size, msg->gas_limit.bytes[0]);
|
|
rlp_length += rlp_calculate_length(toset ? 20 : 0, pubkeyhash[0]);
|
|
rlp_length += rlp_calculate_length(msg->value.size, msg->value.bytes[0]);
|
|
rlp_length += rlp_calculate_length(data_total, msg->data_initial_chunk.bytes[0]);
|
|
if (tx_type) {
|
|
rlp_length += rlp_calculate_number_length(tx_type);
|
|
}
|
|
if (chain_id) {
|
|
rlp_length += rlp_calculate_number_length(chain_id);
|
|
rlp_length += rlp_calculate_length(0, 0);
|
|
rlp_length += rlp_calculate_length(0, 0);
|
|
}
|
|
|
|
/* Stage 2: Store header fields */
|
|
hash_rlp_list_length(rlp_length);
|
|
|
|
layoutProgress(_("Signing"), 100);
|
|
|
|
if (tx_type) {
|
|
hash_rlp_number(tx_type);
|
|
}
|
|
hash_rlp_field(msg->nonce.bytes, msg->nonce.size);
|
|
hash_rlp_field(msg->gas_price.bytes, msg->gas_price.size);
|
|
hash_rlp_field(msg->gas_limit.bytes, msg->gas_limit.size);
|
|
hash_rlp_field(pubkeyhash, toset ? 20 : 0);
|
|
hash_rlp_field(msg->value.bytes, msg->value.size);
|
|
hash_rlp_length(data_total, msg->data_initial_chunk.bytes[0]);
|
|
hash_data(msg->data_initial_chunk.bytes, msg->data_initial_chunk.size);
|
|
data_left = data_total - msg->data_initial_chunk.size;
|
|
|
|
memcpy(privkey, node->private_key, 32);
|
|
|
|
if (data_left > 0) {
|
|
send_request_chunk();
|
|
} else {
|
|
send_signature();
|
|
}
|
|
}
|
|
|
|
void ethereum_signing_txack(const EthereumTxAck *tx)
|
|
{
|
|
if (!ethereum_signing) {
|
|
fsm_sendFailure(FailureType_Failure_UnexpectedMessage, _("Not in Ethereum signing mode"));
|
|
layoutHome();
|
|
return;
|
|
}
|
|
|
|
if (tx->data_chunk.size > data_left) {
|
|
fsm_sendFailure(FailureType_Failure_DataError, _("Too much data"));
|
|
ethereum_signing_abort();
|
|
return;
|
|
}
|
|
|
|
if (data_left > 0 && (!tx->has_data_chunk || tx->data_chunk.size == 0)) {
|
|
fsm_sendFailure(FailureType_Failure_DataError, _("Empty data chunk received"));
|
|
ethereum_signing_abort();
|
|
return;
|
|
}
|
|
|
|
hash_data(tx->data_chunk.bytes, tx->data_chunk.size);
|
|
|
|
data_left -= tx->data_chunk.size;
|
|
|
|
if (data_left > 0) {
|
|
send_request_chunk();
|
|
} else {
|
|
send_signature();
|
|
}
|
|
}
|
|
|
|
void ethereum_signing_abort(void)
|
|
{
|
|
if (ethereum_signing) {
|
|
memzero(privkey, sizeof(privkey));
|
|
layoutHome();
|
|
ethereum_signing = false;
|
|
}
|
|
}
|
|
|
|
static void ethereum_message_hash(const uint8_t *message, size_t message_len, uint8_t hash[32])
|
|
{
|
|
struct SHA3_CTX ctx;
|
|
sha3_256_Init(&ctx);
|
|
sha3_Update(&ctx, (const uint8_t *)"\x19" "Ethereum Signed Message:\n", 26);
|
|
uint8_t c;
|
|
if (message_len > 1000000000) { c = '0' + message_len / 1000000000 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 100000000) { c = '0' + message_len / 100000000 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 10000000) { c = '0' + message_len / 10000000 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 1000000) { c = '0' + message_len / 1000000 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 100000) { c = '0' + message_len / 100000 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 10000) { c = '0' + message_len / 10000 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 1000) { c = '0' + message_len / 1000 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 100) { c = '0' + message_len / 100 % 10; sha3_Update(&ctx, &c, 1); }
|
|
if (message_len > 10) { c = '0' + message_len / 10 % 10; sha3_Update(&ctx, &c, 1); }
|
|
c = '0' + message_len % 10; sha3_Update(&ctx, &c, 1);
|
|
sha3_Update(&ctx, message, message_len);
|
|
keccak_Final(&ctx, hash);
|
|
}
|
|
|
|
void ethereum_message_sign(const EthereumSignMessage *msg, const HDNode *node, EthereumMessageSignature *resp)
|
|
{
|
|
uint8_t pubkeyhash[20];
|
|
if (!hdnode_get_ethereum_pubkeyhash(node, pubkeyhash)) {
|
|
return;
|
|
}
|
|
|
|
resp->has_address = true;
|
|
resp->address[0] = '0';
|
|
resp->address[1] = 'x';
|
|
ethereum_address_checksum(pubkeyhash, resp->address + 2, false, 0);
|
|
// ethereum_address_checksum adds trailing zero
|
|
|
|
uint8_t hash[32];
|
|
ethereum_message_hash(msg->message.bytes, msg->message.size, hash);
|
|
|
|
uint8_t v;
|
|
if (ecdsa_sign_digest(&secp256k1, node->private_key, hash, resp->signature.bytes, &v, ethereum_is_canonic) != 0) {
|
|
fsm_sendFailure(FailureType_Failure_ProcessError, _("Signing failed"));
|
|
return;
|
|
}
|
|
|
|
resp->has_signature = true;
|
|
resp->signature.bytes[64] = 27 + v;
|
|
resp->signature.size = 65;
|
|
msg_write(MessageType_MessageType_EthereumMessageSignature, resp);
|
|
}
|
|
|
|
int ethereum_message_verify(const EthereumVerifyMessage *msg)
|
|
{
|
|
if (msg->signature.size != 65) {
|
|
fsm_sendFailure(FailureType_Failure_DataError, _("Malformed signature"));
|
|
return 1;
|
|
}
|
|
|
|
uint8_t pubkeyhash[20];
|
|
if (!ethereum_parse(msg->address, pubkeyhash)) {
|
|
fsm_sendFailure(FailureType_Failure_DataError, _("Malformed address"));
|
|
return 1;
|
|
}
|
|
|
|
uint8_t pubkey[65];
|
|
uint8_t hash[32];
|
|
|
|
ethereum_message_hash(msg->message.bytes, msg->message.size, hash);
|
|
|
|
/* v should be 27, 28 but some implementations use 0,1. We are
|
|
* compatible with both.
|
|
*/
|
|
uint8_t v = msg->signature.bytes[64];
|
|
if (v >= 27) {
|
|
v -= 27;
|
|
}
|
|
if (v >= 2 ||
|
|
ecdsa_recover_pub_from_sig(&secp256k1, pubkey, msg->signature.bytes, hash, v) != 0) {
|
|
return 2;
|
|
}
|
|
|
|
struct SHA3_CTX ctx;
|
|
sha3_256_Init(&ctx);
|
|
sha3_Update(&ctx, pubkey + 1, 64);
|
|
keccak_Final(&ctx, hash);
|
|
|
|
/* result are the least significant 160 bits */
|
|
if (memcmp(pubkeyhash, hash + 12, 20) != 0) {
|
|
return 2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
bool ethereum_parse(const char *address, uint8_t pubkeyhash[20])
|
|
{
|
|
memzero(pubkeyhash, 20);
|
|
size_t len = strlen(address);
|
|
if (len == 40) {
|
|
// do nothing
|
|
} else
|
|
if (len == 42) {
|
|
// check for "0x" prefix and strip it when required
|
|
if (address[0] != '0') return false;
|
|
if (address[1] != 'x' && address[1] != 'X') return false;
|
|
address += 2;
|
|
len -= 2;
|
|
} else {
|
|
return false;
|
|
}
|
|
for (size_t i = 0; i < len; i++) {
|
|
if (address[i] >= '0' && address[i] <= '9') {
|
|
pubkeyhash[i / 2] |= (address[i] - '0') << ((1 - (i % 2)) * 4);
|
|
} else
|
|
if (address[i] >= 'a' && address[i] <= 'f') {
|
|
pubkeyhash[i / 2] |= ((address[i] - 'a') + 10) << ((1 - (i % 2)) * 4);
|
|
} else
|
|
if (address[i] >= 'A' && address[i] <= 'F') {
|
|
pubkeyhash[i / 2] |= ((address[i] - 'A') + 10) << ((1 - (i % 2)) * 4);
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|