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trezor-firmware/legacy/firmware/stellar.c

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/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2018 ZuluCrypto <zulucrypto@protonmail.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
// Stellar signing workflow:
//
// 1. Client sends a StellarSignTx method to the device with transaction header
// information
// 2. Device confirms transaction details with the user and requests first
// operation
// 3. Client sends protobuf message with details about the operation to sign
// 4. Device confirms operation with user
// 5a. If there are more operations in the transaction, device responds with
// StellarTxOpRequest. Go to 3 5b. If the operation is the last one, device
// responds with StellarSignedTx
#include "stellar.h"
#include <stdbool.h>
#include <time.h>
#include "base32.h"
#include "bignum.h"
#include "bip32.h"
#include "config.h"
#include "crypto.h"
#include "fonts.h"
#include "fsm.h"
#include "gettext.h"
#include "layout2.h"
#include "memzero.h"
#include "messages.h"
#include "messages.pb.h"
#include "oled.h"
#include "protect.h"
#include "util.h"
static bool stellar_signing = false;
static StellarTransaction stellar_activeTx;
/*
* Starts the signing process and parses the transaction header
*/
bool stellar_signingInit(const StellarSignTx *msg) {
memzero(&stellar_activeTx, sizeof(StellarTransaction));
stellar_signing = true;
// Initialize signing context
sha256_Init(&(stellar_activeTx.sha256_ctx));
// Calculate sha256 for network passphrase
// max length defined in messages.options
uint8_t network_hash[32] = {0};
sha256_Raw((uint8_t *)msg->network_passphrase,
strnlen(msg->network_passphrase, 1024), network_hash);
uint8_t tx_type_bytes[4] = {0x00, 0x00, 0x00, 0x02};
// Copy some data into the active tx
stellar_activeTx.num_operations = msg->num_operations;
// Start building what will be signed:
// sha256 of:
// sha256(network passphrase)
// 4-byte unsigned big-endian int type constant (2 for tx)
// remaining bytes are operations added in subsequent messages
stellar_hashupdate_bytes(network_hash, sizeof(network_hash));
stellar_hashupdate_bytes(tx_type_bytes, sizeof(tx_type_bytes));
// Public key comes from deriving the specified account path
const HDNode *node = stellar_deriveNode(msg->address_n, msg->address_n_count);
if (!node) {
return false;
}
memcpy(&(stellar_activeTx.signing_pubkey), node->public_key + 1,
sizeof(stellar_activeTx.signing_pubkey));
stellar_activeTx.address_n_count = msg->address_n_count;
// todo: fix sizeof check
memcpy(&(stellar_activeTx.address_n), &(msg->address_n),
sizeof(stellar_activeTx.address_n));
// Hash: public key
stellar_hashupdate_address(node->public_key + 1);
// Hash: fee
stellar_hashupdate_uint32(msg->fee);
// Hash: sequence number
stellar_hashupdate_uint64(msg->sequence_number);
// Hash: the "has timebounds?" boolean
stellar_hashupdate_bool(true);
// Timebounds are sent as uint32s since that's all we can display, but they
// must be hashed as 64-bit values
stellar_hashupdate_uint32(0);
stellar_hashupdate_uint32(msg->timebounds_start);
stellar_hashupdate_uint32(0);
stellar_hashupdate_uint32(msg->timebounds_end);
// Hash: memo
stellar_hashupdate_uint32(msg->memo_type);
switch (msg->memo_type) {
// None, nothing else to do
case StellarMemoType_NONE:
break;
// Text: 4 bytes (size) + up to 28 bytes
case StellarMemoType_TEXT:
stellar_hashupdate_string((unsigned char *)&(msg->memo_text),
strnlen(msg->memo_text, 28));
break;
// ID (8 bytes, uint64)
case StellarMemoType_ID:
stellar_hashupdate_uint64(msg->memo_id);
break;
// Hash and return are the same data structure (32 byte tx hash)
case StellarMemoType_HASH:
case StellarMemoType_RETURN:
stellar_hashupdate_bytes(msg->memo_hash.bytes, 32);
break;
default:
fsm_sendFailure(FailureType_Failure_DataError,
_("Stellar invalid memo type"));
return false;
}
// Hash: number of operations
stellar_hashupdate_uint32(msg->num_operations);
// Determine what type of network this transaction is for
if (strncmp("Public Global Stellar Network ; September 2015",
msg->network_passphrase, 1024) == 0) {
stellar_activeTx.network_type = 1;
} else if (strncmp("Test SDF Network ; September 2015",
msg->network_passphrase, 1024) == 0) {
stellar_activeTx.network_type = 2;
} else {
stellar_activeTx.network_type = 3;
}
return true;
}
void stellar_signingAbort(void) {
if (stellar_signing) {
stellar_signing = false;
layoutHome();
}
}
static void stellar_signingFail(const char *reason) {
if (!reason) {
reason = _("Unknown error");
}
fsm_sendFailure(FailureType_Failure_ProcessError, reason);
stellar_signingAbort();
}
bool stellar_confirmSourceAccount(bool has_source_account,
const char *str_account) {
stellar_hashupdate_bool(has_source_account);
if (!has_source_account) {
return true;
}
// Convert account string to public key bytes
uint8_t bytes[32] = {0};
if (!stellar_getAddressBytes(str_account, bytes)) {
return false;
}
const char **str_addr_rows = stellar_lineBreakAddress(bytes);
stellar_layoutTransactionDialog(_("Op src account OK?"), NULL,
str_addr_rows[0], str_addr_rows[1],
str_addr_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash: source account
stellar_hashupdate_address(bytes);
return true;
}
bool stellar_confirmCreateAccountOp(const StellarCreateAccountOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(0);
// Validate new account and convert to bytes
uint8_t new_account_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->new_account, new_account_bytes)) {
stellar_signingFail(_("Invalid new account address"));
return false;
}
const char **str_addr_rows = stellar_lineBreakAddress(new_account_bytes);
// Amount being funded
char str_amount_line[32] = {0};
char str_amount[32] = {0};
stellar_format_stroops(msg->starting_balance, str_amount, sizeof(str_amount));
strlcpy(str_amount_line, _("With "), sizeof(str_amount_line));
strlcat(str_amount_line, str_amount, sizeof(str_amount_line));
strlcat(str_amount_line, _(" XLM"), sizeof(str_amount_line));
stellar_layoutTransactionDialog(_("Create account: "), str_addr_rows[0],
str_addr_rows[1], str_addr_rows[2],
str_amount_line);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash: address
stellar_hashupdate_address(new_account_bytes);
// Hash: starting amount
stellar_hashupdate_uint64(msg->starting_balance);
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmPaymentOp(const StellarPaymentOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(1);
// Validate destination account and convert to bytes
uint8_t destination_account_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->destination_account,
destination_account_bytes)) {
stellar_signingFail(_("Invalid destination account"));
return false;
}
const char **str_addr_rows =
stellar_lineBreakAddress(destination_account_bytes);
// To: G...
char str_to[32] = {0};
strlcpy(str_to, _("To: "), sizeof(str_to));
strlcat(str_to, str_addr_rows[0], sizeof(str_to));
char str_asset_row[32] = {0};
memzero(str_asset_row, sizeof(str_asset_row));
stellar_format_asset(&(msg->asset), str_asset_row, sizeof(str_asset_row));
char str_pay_amount[32] = {0};
char str_amount[32] = {0};
stellar_format_stroops(msg->amount, str_amount, sizeof(str_amount));
strlcpy(str_pay_amount, _("Pay "), sizeof(str_pay_amount));
strlcat(str_pay_amount, str_amount, sizeof(str_pay_amount));
stellar_layoutTransactionDialog(str_pay_amount, str_asset_row, str_to,
str_addr_rows[1], str_addr_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash destination
stellar_hashupdate_address(destination_account_bytes);
// asset
stellar_hashupdate_asset(&(msg->asset));
// amount (even though amount is signed it doesn't matter for hashing)
stellar_hashupdate_uint64(msg->amount);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmPathPaymentStrictReceiveOp(
const StellarPathPaymentStrictReceiveOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(2);
// Validate destination account and convert to bytes
uint8_t destination_account_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->destination_account,
destination_account_bytes)) {
stellar_signingFail(_("Invalid destination account"));
return false;
}
const char **str_dest_rows =
stellar_lineBreakAddress(destination_account_bytes);
// To: G...
char str_to[32] = {0};
strlcpy(str_to, _("To: "), sizeof(str_to));
strlcat(str_to, str_dest_rows[0], sizeof(str_to));
char str_send_asset[32] = {0};
char str_dest_asset[32] = {0};
stellar_format_asset(&(msg->send_asset), str_send_asset,
sizeof(str_send_asset));
stellar_format_asset(&(msg->destination_asset), str_dest_asset,
sizeof(str_dest_asset));
char str_pay_amount[32] = {0};
char str_amount[32] = {0};
stellar_format_stroops(msg->destination_amount, str_amount,
sizeof(str_amount));
strlcpy(str_pay_amount, _("Path Pay "), sizeof(str_pay_amount));
strlcat(str_pay_amount, str_amount, sizeof(str_pay_amount));
// Confirm what the receiver will get
/*
Path Pay 100
JPY (G1234ABCDEF)
To: G....
....
....
*/
stellar_layoutTransactionDialog(str_pay_amount, str_dest_asset, str_to,
str_dest_rows[1], str_dest_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Confirm what the sender is using to pay
char str_source_amount[32] = {0};
char str_source_number[32] = {0};
stellar_format_stroops(msg->send_max, str_source_number,
sizeof(str_source_number));
strlcpy(str_source_amount, _("Pay Using "), sizeof(str_source_amount));
strlcat(str_source_amount, str_source_number, sizeof(str_source_amount));
stellar_layoutTransactionDialog(str_source_amount, str_send_asset,
_("This is the max"),
_("amount debited from your"), _("account."));
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Note: no confirmation for intermediate steps since they don't impact the
// user
// Hash send asset
stellar_hashupdate_asset(&(msg->send_asset));
// send max (signed vs. unsigned doesn't matter wrt hashing)
stellar_hashupdate_uint64(msg->send_max);
// destination account
stellar_hashupdate_address(destination_account_bytes);
// destination asset
stellar_hashupdate_asset(&(msg->destination_asset));
// destination amount
stellar_hashupdate_uint64(msg->destination_amount);
// paths are stored as an array so hash the number of elements as a uint32
stellar_hashupdate_uint32(msg->paths_count);
for (uint8_t i = 0; i < msg->paths_count; i++) {
stellar_hashupdate_asset(&(msg->paths[i]));
}
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmPathPaymentStrictSendOp(
const StellarPathPaymentStrictSendOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(13);
// Validate destination account and convert to bytes
uint8_t destination_account_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->destination_account,
destination_account_bytes)) {
stellar_signingFail(_("Invalid destination account"));
return false;
}
const char **str_dest_rows =
stellar_lineBreakAddress(destination_account_bytes);
// To: G...
char str_to[32] = {0};
strlcpy(str_to, _("To: "), sizeof(str_to));
strlcat(str_to, str_dest_rows[0], sizeof(str_to));
char str_send_asset[32] = {0};
char str_dest_asset[32] = {0};
stellar_format_asset(&(msg->send_asset), str_send_asset,
sizeof(str_send_asset));
stellar_format_asset(&(msg->destination_asset), str_dest_asset,
sizeof(str_dest_asset));
char str_pay_amount[32] = {0};
char str_amount[32] = {0};
stellar_format_stroops(msg->destination_min, str_amount, sizeof(str_amount));
strlcat(str_pay_amount, str_amount, sizeof(str_pay_amount));
// Confirm what the receiver will get
/*
Path Pay at least
100.0000000
JPY (G1234ABCDEF)
To: G....
....
....
*/
stellar_layoutTransactionDialog(_("Path Pay at least"), str_pay_amount,
str_dest_asset, str_to, str_dest_rows[1]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Confirm what the sender is using to pay
char str_source_amount[32] = {0};
char str_source_number[32] = {0};
stellar_format_stroops(msg->send_amount, str_source_number,
sizeof(str_source_number));
strlcpy(str_source_amount, _("Pay Using "), sizeof(str_source_amount));
strlcat(str_source_amount, str_source_number, sizeof(str_source_amount));
stellar_layoutTransactionDialog(
str_dest_rows[2], str_source_amount, str_send_asset,
_("This is the amount debited"), _("from your account."));
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Note: no confirmation for intermediate steps since they don't impact the
// user
// Hash send asset
stellar_hashupdate_asset(&(msg->send_asset));
// send amount (signed vs. unsigned doesn't matter wrt hashing)
stellar_hashupdate_uint64(msg->send_amount);
// destination account
stellar_hashupdate_address(destination_account_bytes);
// destination asset
stellar_hashupdate_asset(&(msg->destination_asset));
// destination amount
stellar_hashupdate_uint64(msg->destination_min);
// paths are stored as an array so hash the number of elements as a uint32
stellar_hashupdate_uint32(msg->paths_count);
for (uint8_t i = 0; i < msg->paths_count; i++) {
stellar_hashupdate_asset(&(msg->paths[i]));
}
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmManageBuyOfferOp(const StellarManageBuyOfferOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(12);
// New Offer / Delete #123 / Update #123
char str_offer[32] = {0};
if (msg->offer_id == 0) {
strlcpy(str_offer, _("New Offer"), sizeof(str_offer));
} else {
char str_offer_id[20] = {0};
stellar_format_uint64(msg->offer_id, str_offer_id, sizeof(str_offer_id));
if (msg->amount == 0) {
strlcpy(str_offer, _("Delete #"), sizeof(str_offer));
} else {
strlcpy(str_offer, _("Update #"), sizeof(str_offer));
}
strlcat(str_offer, str_offer_id, sizeof(str_offer));
}
char str_buying[32] = {0};
char str_buying_amount[32] = {0};
char str_buying_asset[32] = {0};
stellar_format_asset(&(msg->buying_asset), str_buying_asset,
sizeof(str_buying_asset));
stellar_format_stroops(msg->amount, str_buying_amount,
sizeof(str_buying_amount));
/*
Buy 200
XLM (Native Asset)
*/
strlcpy(str_buying, _("Buy "), sizeof(str_buying));
strlcat(str_buying, str_buying_amount, sizeof(str_buying));
char str_selling[32] = {0};
char str_selling_asset[32] = {0};
char str_price[32] = {0};
stellar_format_asset(&(msg->selling_asset), str_selling_asset,
sizeof(str_selling_asset));
stellar_format_price(msg->price_n, msg->price_d, str_price,
sizeof(str_price));
/*
For 0.675952 Per
USD (G12345678)
*/
strlcpy(str_selling, _("For "), sizeof(str_selling));
strlcat(str_selling, str_price, sizeof(str_selling));
strlcat(str_selling, _(" Per"), sizeof(str_selling));
stellar_layoutTransactionDialog(str_offer, str_buying, str_buying_asset,
str_selling, str_selling_asset);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash selling asset
stellar_hashupdate_asset(&(msg->selling_asset));
// buying asset
stellar_hashupdate_asset(&(msg->buying_asset));
// amount to buy (signed vs. unsigned doesn't matter wrt hashing)
stellar_hashupdate_uint64(msg->amount);
// numerator
stellar_hashupdate_uint32(msg->price_n);
// denominator
stellar_hashupdate_uint32(msg->price_d);
// offer ID
stellar_hashupdate_uint64(msg->offer_id);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmManageSellOfferOp(const StellarManageSellOfferOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(3);
// New Offer / Delete #123 / Update #123
char str_offer[32] = {0};
if (msg->offer_id == 0) {
strlcpy(str_offer, _("New Offer"), sizeof(str_offer));
} else {
char str_offer_id[20] = {0};
stellar_format_uint64(msg->offer_id, str_offer_id, sizeof(str_offer_id));
if (msg->amount == 0) {
strlcpy(str_offer, _("Delete #"), sizeof(str_offer));
} else {
strlcpy(str_offer, _("Update #"), sizeof(str_offer));
}
strlcat(str_offer, str_offer_id, sizeof(str_offer));
}
char str_selling[32] = {0};
char str_sell_amount[32] = {0};
char str_selling_asset[32] = {0};
stellar_format_asset(&(msg->selling_asset), str_selling_asset,
sizeof(str_selling_asset));
stellar_format_stroops(msg->amount, str_sell_amount, sizeof(str_sell_amount));
/*
Sell 200
XLM (Native Asset)
*/
strlcpy(str_selling, _("Sell "), sizeof(str_selling));
strlcat(str_selling, str_sell_amount, sizeof(str_selling));
char str_buying[32] = {0};
char str_buying_asset[32] = {0};
char str_price[32] = {0};
stellar_format_asset(&(msg->buying_asset), str_buying_asset,
sizeof(str_buying_asset));
stellar_format_price(msg->price_n, msg->price_d, str_price,
sizeof(str_price));
/*
For 0.675952 Per
USD (G12345678)
*/
strlcpy(str_buying, _("For "), sizeof(str_buying));
strlcat(str_buying, str_price, sizeof(str_buying));
strlcat(str_buying, _(" Per"), sizeof(str_buying));
stellar_layoutTransactionDialog(str_offer, str_selling, str_selling_asset,
str_buying, str_buying_asset);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash selling asset
stellar_hashupdate_asset(&(msg->selling_asset));
// buying asset
stellar_hashupdate_asset(&(msg->buying_asset));
// amount to sell (signed vs. unsigned doesn't matter wrt hashing)
stellar_hashupdate_uint64(msg->amount);
// numerator
stellar_hashupdate_uint32(msg->price_n);
// denominator
stellar_hashupdate_uint32(msg->price_d);
// offer ID
stellar_hashupdate_uint64(msg->offer_id);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmCreatePassiveSellOfferOp(
const StellarCreatePassiveSellOfferOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(4);
// New Offer / Delete #123 / Update #123
char str_offer[32] = {0};
if (msg->amount == 0) {
strlcpy(str_offer, _("Delete Passive Offer"), sizeof(str_offer));
} else {
strlcpy(str_offer, _("New Passive Offer"), sizeof(str_offer));
}
char str_selling[32] = {0};
char str_sell_amount[32] = {0};
char str_selling_asset[32] = {0};
stellar_format_asset(&(msg->selling_asset), str_selling_asset,
sizeof(str_selling_asset));
stellar_format_stroops(msg->amount, str_sell_amount, sizeof(str_sell_amount));
/*
Sell 200
XLM (Native Asset)
*/
strlcpy(str_selling, _("Sell "), sizeof(str_selling));
strlcat(str_selling, str_sell_amount, sizeof(str_selling));
char str_buying[32] = {0};
char str_buying_asset[32] = {0};
char str_price[32] = {0};
stellar_format_asset(&(msg->buying_asset), str_buying_asset,
sizeof(str_buying_asset));
stellar_format_price(msg->price_n, msg->price_d, str_price,
sizeof(str_price));
/*
For 0.675952 Per
USD (G12345678)
*/
strlcpy(str_buying, _("For "), sizeof(str_buying));
strlcat(str_buying, str_price, sizeof(str_buying));
strlcat(str_buying, _(" Per"), sizeof(str_buying));
stellar_layoutTransactionDialog(str_offer, str_selling, str_selling_asset,
str_buying, str_buying_asset);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash selling asset
stellar_hashupdate_asset(&(msg->selling_asset));
// buying asset
stellar_hashupdate_asset(&(msg->buying_asset));
// amount to sell (signed vs. unsigned doesn't matter wrt hashing)
stellar_hashupdate_uint64(msg->amount);
// numerator
stellar_hashupdate_uint32(msg->price_n);
// denominator
stellar_hashupdate_uint32(msg->price_d);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmSetOptionsOp(const StellarSetOptionsOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(5);
// Something like Set Inflation Destination
char str_title[32] = {0};
char rows[4][32] = {0};
int row_idx = 0;
memzero(rows, sizeof(rows));
// Inflation destination
stellar_hashupdate_bool(msg->has_inflation_destination_account);
if (msg->has_inflation_destination_account) {
strlcpy(str_title, _("Set Inflation Destination"), sizeof(str_title));
// Validate account and convert to bytes
uint8_t inflation_destination_account_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->inflation_destination_account,
inflation_destination_account_bytes)) {
stellar_signingFail(_("Invalid inflation destination account"));
return false;
}
const char **str_addr_rows =
stellar_lineBreakAddress(inflation_destination_account_bytes);
stellar_layoutTransactionDialog(str_title, NULL, str_addr_rows[0],
str_addr_rows[1], str_addr_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// address
stellar_hashupdate_address(inflation_destination_account_bytes);
}
// Clear flags
stellar_hashupdate_bool(msg->has_clear_flags);
if (msg->has_clear_flags) {
strlcpy(str_title, _("Clear Flag(s)"), sizeof(str_title));
// Auth required
if (msg->clear_flags > 7) {
stellar_signingFail(_("Invalid flags"));
return false;
}
if (msg->clear_flags & 0x01) {
strlcpy(rows[row_idx], _("AUTH_REQUIRED"), sizeof(rows[row_idx]));
row_idx++;
}
// Auth revocable
if (msg->clear_flags & 0x02) {
strlcpy(rows[row_idx], _("AUTH_REVOCABLE"), sizeof(rows[row_idx]));
row_idx++;
}
// Auth immutable
if (msg->clear_flags & 0x04) {
strlcpy(rows[row_idx], _("AUTH_IMMUTABLE"), sizeof(rows[row_idx]));
row_idx++;
}
stellar_layoutTransactionDialog(str_title, rows[0], rows[1], rows[2],
rows[3]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
memzero(rows, sizeof(rows));
row_idx = 0;
// Hash flags
stellar_hashupdate_uint32(msg->clear_flags);
}
// Set flags
stellar_hashupdate_bool(msg->has_set_flags);
if (msg->has_set_flags) {
strlcpy(str_title, _("Set Flag(s)"), sizeof(str_title));
// Auth required
if (msg->set_flags > 7) {
stellar_signingFail(_("Invalid flags"));
return false;
}
if (msg->set_flags & 0x01) {
strlcpy(rows[row_idx], _("AUTH_REQUIRED"), sizeof(rows[row_idx]));
row_idx++;
}
// Auth revocable
if (msg->set_flags & 0x02) {
strlcpy(rows[row_idx], _("AUTH_REVOCABLE"), sizeof(rows[row_idx]));
row_idx++;
}
// Auth immutable
if (msg->set_flags & 0x04) {
strlcpy(rows[row_idx], _("AUTH_IMMUTABLE"), sizeof(rows[row_idx]));
row_idx++;
}
stellar_layoutTransactionDialog(str_title, rows[0], rows[1], rows[2],
rows[3]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
memzero(rows, sizeof(rows));
row_idx = 0;
// Hash flags
stellar_hashupdate_uint32(msg->set_flags);
}
// Account thresholds
bool show_thresholds_confirm = false;
row_idx = 0;
stellar_hashupdate_bool(msg->has_master_weight);
if (msg->has_master_weight) {
char str_master_weight[10 + 1] = {0};
show_thresholds_confirm = true;
stellar_format_uint32(msg->master_weight, str_master_weight,
sizeof(str_master_weight));
strlcpy(rows[row_idx], _("Master Weight: "), sizeof(rows[row_idx]));
strlcat(rows[row_idx], str_master_weight, sizeof(rows[row_idx]));
row_idx++;
// Hash master weight
stellar_hashupdate_uint32(msg->master_weight);
}
stellar_hashupdate_bool(msg->has_low_threshold);
if (msg->has_low_threshold) {
char str_low_threshold[10 + 1] = {0};
show_thresholds_confirm = true;
stellar_format_uint32(msg->low_threshold, str_low_threshold,
sizeof(str_low_threshold));
strlcpy(rows[row_idx], _("Low: "), sizeof(rows[row_idx]));
strlcat(rows[row_idx], str_low_threshold, sizeof(rows[row_idx]));
row_idx++;
// Hash low threshold
stellar_hashupdate_uint32(msg->low_threshold);
}
stellar_hashupdate_bool(msg->has_medium_threshold);
if (msg->has_medium_threshold) {
char str_med_threshold[10 + 1] = {0};
show_thresholds_confirm = true;
stellar_format_uint32(msg->medium_threshold, str_med_threshold,
sizeof(str_med_threshold));
strlcpy(rows[row_idx], _("Medium: "), sizeof(rows[row_idx]));
strlcat(rows[row_idx], str_med_threshold, sizeof(rows[row_idx]));
row_idx++;
// Hash medium threshold
stellar_hashupdate_uint32(msg->medium_threshold);
}
stellar_hashupdate_bool(msg->has_high_threshold);
if (msg->has_high_threshold) {
char str_high_threshold[10 + 1] = {0};
show_thresholds_confirm = true;
stellar_format_uint32(msg->high_threshold, str_high_threshold,
sizeof(str_high_threshold));
strlcpy(rows[row_idx], _("High: "), sizeof(rows[row_idx]));
strlcat(rows[row_idx], str_high_threshold, sizeof(rows[row_idx]));
row_idx++;
// Hash high threshold
stellar_hashupdate_uint32(msg->high_threshold);
}
if (show_thresholds_confirm) {
strlcpy(str_title, _("Account Thresholds"), sizeof(str_title));
stellar_layoutTransactionDialog(str_title, rows[0], rows[1], rows[2],
rows[3]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
memzero(rows, sizeof(rows));
row_idx = 0;
}
// Home domain
stellar_hashupdate_bool(msg->has_home_domain);
if (msg->has_home_domain) {
strlcpy(str_title, _("Home Domain"), sizeof(str_title));
// Split home domain if longer than 22 characters
int home_domain_len = strnlen(msg->home_domain, 32);
if (home_domain_len > 22) {
strlcpy(rows[0], msg->home_domain, 22);
strlcpy(rows[1], msg->home_domain + 21, sizeof(rows[1]));
} else {
strlcpy(rows[0], msg->home_domain, sizeof(rows[0]));
}
stellar_layoutTransactionDialog(str_title, rows[0], rows[1], NULL, NULL);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
memzero(rows, sizeof(rows));
row_idx = 0;
stellar_hashupdate_string((unsigned char *)&(msg->home_domain),
strnlen(msg->home_domain, 32));
}
// Signer
stellar_hashupdate_bool(msg->has_signer_type);
if (msg->has_signer_type) {
if (msg->signer_weight > 0) {
strlcpy(str_title, _("Add Signer: "), sizeof(str_title));
} else {
strlcpy(str_title, _("REMOVE Signer: "), sizeof(str_title));
}
// Format weight as a string
char str_weight[16] = {0};
stellar_format_uint32(msg->signer_weight, str_weight, sizeof(str_weight));
char str_weight_row[32] = {0};
strlcpy(str_weight_row, _("Weight: "), sizeof(str_weight_row));
strlcat(str_weight_row, str_weight, sizeof(str_weight_row));
// 0 = account, 1 = pre-auth, 2 = hash(x)
char *str_signer_type = NULL;
bool needs_hash_confirm = false;
switch (msg->signer_type) {
case StellarSignerType_ACCOUNT:
strlcat(str_title, _("account"), sizeof(str_title));
const char **str_addr_rows =
stellar_lineBreakAddress(msg->signer_key.bytes);
stellar_layoutTransactionDialog(str_title, str_weight_row,
str_addr_rows[0], str_addr_rows[1],
str_addr_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall,
false)) {
stellar_signingFail(_("User canceled"));
return false;
}
break;
case StellarSignerType_PRE_AUTH:
case StellarSignerType_HASH:
str_signer_type =
(msg->signer_type == 1) ? _("pre-auth hash") : _("hash(x)");
needs_hash_confirm = true;
strlcat(str_title, str_signer_type, sizeof(str_title));
stellar_layoutTransactionDialog(str_title, str_weight_row, NULL,
_("(confirm hash on next"),
_("screen)"));
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall,
false)) {
stellar_signingFail(_("User canceled"));
return false;
}
break;
default:
stellar_signingFail(_("Stellar: invalid signer type"));
return false;
}
// Extra confirmation step for hash signers
if (needs_hash_confirm) {
data2hex(msg->signer_key.bytes + 0, 8, rows[row_idx++]);
data2hex(msg->signer_key.bytes + 8, 8, rows[row_idx++]);
data2hex(msg->signer_key.bytes + 16, 8, rows[row_idx++]);
data2hex(msg->signer_key.bytes + 24, 8, rows[row_idx++]);
stellar_layoutTransactionDialog(_("Confirm Hash"), rows[0], rows[1],
rows[2], rows[3]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
memzero(rows, sizeof(rows));
row_idx = 0;
}
// Hash: signer type
stellar_hashupdate_uint32(msg->signer_type);
// key
stellar_hashupdate_bytes(msg->signer_key.bytes, 32);
// weight
stellar_hashupdate_uint32(msg->signer_weight);
}
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmChangeTrustOp(const StellarChangeTrustOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(6);
// Add Trust: USD
char str_title[32] = {0};
if (msg->limit == 0) {
strlcpy(str_title, _("DELETE Trust: "), sizeof(str_title));
} else {
strlcpy(str_title, _("Add Trust: "), sizeof(str_title));
}
strlcat(str_title, msg->asset.code, sizeof(str_title));
// Amount: MAX (or a number)
char str_amount_row[32] = {0};
strlcpy(str_amount_row, _("Amount: "), sizeof(str_amount_row));
if (msg->limit == 9223372036854775807) {
strlcat(str_amount_row, _("[Maximum]"), sizeof(str_amount_row));
} else {
char str_amount[32] = {0};
stellar_format_stroops(msg->limit, str_amount, sizeof(str_amount));
strlcat(str_amount_row, str_amount, sizeof(str_amount_row));
}
// Validate destination account and convert to bytes
uint8_t asset_issuer_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->asset.issuer, asset_issuer_bytes)) {
stellar_signingFail(_("User canceled"));
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Invalid asset issuer"));
return false;
}
// Display full issuer address
const char **str_addr_rows = stellar_lineBreakAddress(asset_issuer_bytes);
stellar_layoutTransactionDialog(str_title, str_amount_row, str_addr_rows[0],
str_addr_rows[1], str_addr_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash: asset
stellar_hashupdate_asset(&(msg->asset));
// limit
stellar_hashupdate_uint64(msg->limit);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmAllowTrustOp(const StellarAllowTrustOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(7);
// Add Trust: USD
char str_title[32] = {0};
if (msg->is_authorized) {
strlcpy(str_title, _("Allow Trust of"), sizeof(str_title));
} else {
strlcpy(str_title, _("REVOKE Trust of"), sizeof(str_title));
}
// Asset code
char str_asset_row[32] = {0};
strlcpy(str_asset_row, msg->asset_code, sizeof(str_asset_row));
// Validate account and convert to bytes
uint8_t trusted_account_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->trusted_account, trusted_account_bytes)) {
stellar_signingFail(_("Invalid trusted account"));
return false;
}
const char **str_trustor_rows =
stellar_lineBreakAddress(trusted_account_bytes);
// By: G...
char str_by[32] = {0};
strlcpy(str_by, _("By: "), sizeof(str_by));
strlcat(str_by, str_trustor_rows[0], sizeof(str_by));
stellar_layoutTransactionDialog(str_title, str_asset_row, str_by,
str_trustor_rows[1], str_trustor_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash: trustor account (the account being allowed to access the asset)
stellar_hashupdate_address(trusted_account_bytes);
// asset type
stellar_hashupdate_uint32(msg->asset_type);
// asset code
char padded_code[12 + 1] = {0};
switch (msg->asset_type) {
case StellarAssetType_NATIVE: // native asset (XLM)
break;
case StellarAssetType_ALPHANUM4:
strlcpy(padded_code, msg->asset_code, 4 + 1);
stellar_hashupdate_bytes((uint8_t *)padded_code, 4);
break;
case StellarAssetType_ALPHANUM12:
strlcpy(padded_code, msg->asset_code, 12 + 1);
stellar_hashupdate_bytes((uint8_t *)padded_code, 12);
break;
default:
stellar_signingFail(_("Stellar: invalid asset type"));
return false;
}
// is authorized
stellar_hashupdate_bool(msg->is_authorized);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmAccountMergeOp(const StellarAccountMergeOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(8);
// Validate account and convert to bytes
uint8_t destination_account_bytes[STELLAR_KEY_SIZE] = {0};
if (!stellar_getAddressBytes(msg->destination_account,
destination_account_bytes)) {
stellar_signingFail(_("Invalid destination account"));
return false;
}
const char **str_destination_rows =
stellar_lineBreakAddress(destination_account_bytes);
stellar_layoutTransactionDialog(
_("Merge Account"), _("All XLM will be sent to:"),
str_destination_rows[0], str_destination_rows[1],
str_destination_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash: destination account
stellar_hashupdate_address(destination_account_bytes);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmManageDataOp(const StellarManageDataOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(10);
char str_title[32] = {0};
if (msg->has_value) {
strlcpy(str_title, _("Set data value key:"), sizeof(str_title));
} else {
strlcpy(str_title, _("CLEAR data value key:"), sizeof(str_title));
}
// Confirm key
const char **str_key_lines =
split_message((const uint8_t *)(msg->key), strnlen(msg->key, 64), 16);
stellar_layoutTransactionDialog(str_title, str_key_lines[0], str_key_lines[1],
str_key_lines[2], str_key_lines[3]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Confirm value by displaying sha256 hash since this can contain
// non-printable characters
if (msg->has_value) {
strlcpy(str_title, _("Confirm sha256 of value:"), sizeof(str_title));
char str_hash_digest[SHA256_DIGEST_STRING_LENGTH] = {0};
sha256_Data(msg->value.bytes, msg->value.size, str_hash_digest);
const char **str_hash_lines = split_message(
(const uint8_t *)str_hash_digest, sizeof(str_hash_digest), 16);
stellar_layoutTransactionDialog(str_title, str_hash_lines[0],
str_hash_lines[1], str_hash_lines[2],
str_hash_lines[3]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
}
// Hash: key
stellar_hashupdate_string((unsigned char *)&(msg->key),
strnlen(msg->key, 64));
// value
stellar_hashupdate_bool(msg->has_value);
if (msg->has_value) {
stellar_hashupdate_string(msg->value.bytes, msg->value.size);
}
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
bool stellar_confirmBumpSequenceOp(const StellarBumpSequenceOp *msg) {
if (!stellar_signing) return false;
if (!stellar_confirmSourceAccount(msg->has_source_account,
msg->source_account)) {
stellar_signingFail(_("Source account error"));
return false;
}
// Hash: operation type
stellar_hashupdate_uint32(11);
char str_bump_to[20] = {0};
stellar_format_uint64(msg->bump_to, str_bump_to, sizeof(str_bump_to));
stellar_layoutTransactionDialog(_("Bump Sequence"), _("Set sequence to:"),
str_bump_to, NULL, NULL);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return false;
}
// Hash: bump to
stellar_hashupdate_uint64(msg->bump_to);
// At this point, the operation is confirmed
stellar_activeTx.confirmed_operations++;
return true;
}
/**
* Populates the fields of resp with the signature of the active transaction
*/
void stellar_fillSignedTx(StellarSignedTx *resp) {
// Finalize the transaction by hashing 4 null bytes representing a (currently
// unused) empty union
stellar_hashupdate_uint32(0);
// Add the public key for verification that the right account was used for
// signing
memcpy(resp->public_key.bytes, stellar_activeTx.signing_pubkey, 32);
resp->public_key.size = 32;
// Add the signature (note that this does not include the 4-byte hint since it
// can be calculated from the public key)
uint8_t signature[64] = {0};
// Note: this calls sha256_Final on the hash context
stellar_getSignatureForActiveTx(signature);
memcpy(resp->signature.bytes, signature, sizeof(signature));
resp->signature.size = sizeof(signature);
}
bool stellar_allOperationsConfirmed() {
return stellar_activeTx.confirmed_operations ==
stellar_activeTx.num_operations;
}
/*
* Calculates and sets the signature for the active transaction
*/
void stellar_getSignatureForActiveTx(uint8_t *out_signature) {
const HDNode *node = stellar_deriveNode(stellar_activeTx.address_n,
stellar_activeTx.address_n_count);
if (!node) {
// return empty signature when we can't derive node
memzero(out_signature, 64);
return;
}
// Signature is the ed25519 detached signature of the sha256 of all the bytes
// that have been read so far
uint8_t to_sign[32] = {0};
sha256_Final(&(stellar_activeTx.sha256_ctx), to_sign);
uint8_t signature[64] = {0};
ed25519_sign(to_sign, sizeof(to_sign), node->private_key, signature);
memcpy(out_signature, signature, sizeof(signature));
}
/*
* Returns number (representing stroops) formatted as XLM
* For example, if number has value 1000000000 then it will be returned as
* "100.0"
*/
void stellar_format_stroops(uint64_t number, char *out, size_t outlen) {
bn_format_amount(number, NULL, NULL, 7, out, outlen);
}
/*
* Formats a price represented as a uint32 numerator and uint32 denominator
*
* Note that there may be a loss of precision between the real price value and
* what is shown to the user
*
* Smallest possible price is 1 / 4294967296 which is:
* 0.00000000023283064365386962890625
*
* largest possible price is:
* 4294967296
*/
void stellar_format_price(uint32_t numerator, uint32_t denominator, char *out,
size_t outlen) {
memzero(out, outlen);
// early exit for invalid denominator
if (denominator == 0) {
strlcpy(out, _("[Invalid Price]"), outlen);
return;
}
// early exit for zero
if (numerator == 0) {
strlcpy(out, "0", outlen);
return;
}
int scale = 0;
uint64_t value = numerator;
while (value < (UINT64_MAX / 10)) {
value *= 10;
scale++;
}
value /= denominator;
while (value < (UINT64_MAX / 10)) {
value *= 10;
scale++;
}
// Format with bn_format_uint64
bn_format_uint64(value, NULL, NULL, 6, 6 - scale, true, ',', out, outlen);
}
/*
* Returns a uint32 formatted as a string
*/
void stellar_format_uint32(uint32_t number, char *out, size_t outlen) {
bignum256 bn_number = {0};
bn_read_uint32(number, &bn_number);
bn_format(&bn_number, NULL, NULL, 0, 0, false, ',', out, outlen);
}
/*
* Returns a uint64 formatted as a string
*/
void stellar_format_uint64(uint64_t number, char *out, size_t outlen) {
bn_format_uint64(number, NULL, NULL, 0, 0, false, ',', out, outlen);
}
/*
* Breaks a 56 character address into 3 lines of lengths 16, 20, 20
* This is to allow a small label to be prepended to the first line
*/
const char **stellar_lineBreakAddress(const uint8_t *addrbytes) {
char str_fulladdr[56 + 1] = {0};
static char rows[3][20 + 1];
memzero(rows, sizeof(rows));
// get full address string
stellar_publicAddressAsStr(addrbytes, str_fulladdr, sizeof(str_fulladdr));
// Break it into 3 lines
strlcpy(rows[0], str_fulladdr + 0, 17);
strlcpy(rows[1], str_fulladdr + 16, 21);
strlcpy(rows[2], str_fulladdr + 16 + 20, 21);
static const char *ret[3] = {rows[0], rows[1], rows[2]};
return ret;
}
/*
* Returns the asset formatted to fit in a single row
*
* Examples:
* XLM (Native Asset)
* MOBI (G123456789000)
* ALPHA12EXAMP (G0987)
*/
void stellar_format_asset(const StellarAsset *asset, char *str_formatted,
size_t len) {
char str_asset_code[12 + 1] = {0};
// truncated asset issuer, final length depends on length of asset code
char str_asset_issuer_trunc[13 + 1] = {0};
memzero(str_formatted, len);
memzero(str_asset_code, sizeof(str_asset_code));
memzero(str_asset_issuer_trunc, sizeof(str_asset_issuer_trunc));
// Validate issuer account for non-native assets
if (asset->type != StellarAssetType_NATIVE &&
!stellar_validateAddress(asset->issuer)) {
stellar_signingFail(_("Invalid asset issuer"));
return;
}
// Native asset
if (asset->type == StellarAssetType_NATIVE) {
strlcpy(str_formatted, _("XLM (native asset)"), len);
}
// 4-character custom
if (asset->type == StellarAssetType_ALPHANUM4) {
memcpy(str_asset_code, asset->code, 4);
strlcpy(str_formatted, str_asset_code, len);
// Truncate issuer to 13 chars
memcpy(str_asset_issuer_trunc, asset->issuer, 13);
}
// 12-character custom
if (asset->type == StellarAssetType_ALPHANUM12) {
memcpy(str_asset_code, asset->code, 12);
strlcpy(str_formatted, str_asset_code, len);
// Truncate issuer to 5 characters
memcpy(str_asset_issuer_trunc, asset->issuer, 5);
}
// Issuer is read the same way for both types of custom assets
if (asset->type == StellarAssetType_ALPHANUM4 ||
asset->type == StellarAssetType_ALPHANUM12) {
strlcat(str_formatted, _(" ("), len);
strlcat(str_formatted, str_asset_issuer_trunc, len);
strlcat(str_formatted, _(")"), len);
}
}
size_t stellar_publicAddressAsStr(const uint8_t *bytes, char *out,
size_t outlen) {
// version + key bytes + checksum
uint8_t keylen = 1 + 32 + 2;
uint8_t bytes_full[keylen];
memset(bytes_full, 0, sizeof(bytes_full));
bytes_full[0] = 6 << 3; // 'G'
memcpy(bytes_full + 1, bytes, 32);
// Last two bytes are the checksum
uint16_t checksum = stellar_crc16(bytes_full, 33);
bytes_full[keylen - 2] = checksum & 0x00ff;
bytes_full[keylen - 1] = (checksum >> 8) & 0x00ff;
base32_encode(bytes_full, keylen, out, outlen, BASE32_ALPHABET_RFC4648);
// Public key will always be 56 characters
return 56;
}
/**
* Stellar account string is a base32-encoded string that starts with "G"
*
* It decodes to the following format:
* Byte 0 - always 0x30 ("G" when base32 encoded), version byte indicating a
* public key Bytes 1-33 - 32-byte public key bytes Bytes 34-35 - 2-byte CRC16
* checksum of the version byte + public key bytes (first 33 bytes)
*
* Note that the stellar "seed" (private key) also uses this format except the
* version byte is 0xC0 which encodes to "S" in base32
*/
bool stellar_validateAddress(const char *str_address) {
bool valid = false;
uint8_t decoded[STELLAR_ADDRESS_SIZE_RAW] = {0};
memzero(decoded, sizeof(decoded));
if (strlen(str_address) != STELLAR_ADDRESS_SIZE) {
return false;
}
// Check that it decodes correctly
uint8_t *ret = base32_decode(str_address, STELLAR_ADDRESS_SIZE, decoded,
sizeof(decoded), BASE32_ALPHABET_RFC4648);
valid = (ret != NULL);
// ... and that version byte is 0x30
if (valid && decoded[0] != 0x30) {
valid = false;
}
// ... and that checksums match
uint16_t checksum_expected = stellar_crc16(decoded, 33);
uint16_t checksum_actual =
(decoded[34] << 8) | decoded[33]; // unsigned short (little endian)
if (valid && checksum_expected != checksum_actual) {
valid = false;
}
memzero(decoded, sizeof(decoded));
return valid;
}
/**
* Converts a string address (G...) to the 32-byte raw address
*/
bool stellar_getAddressBytes(const char *str_address, uint8_t *out_bytes) {
uint8_t decoded[STELLAR_ADDRESS_SIZE_RAW] = {0};
memzero(decoded, sizeof(decoded));
// Ensure address is valid
if (!stellar_validateAddress(str_address)) return false;
base32_decode(str_address, STELLAR_ADDRESS_SIZE, decoded, sizeof(decoded),
BASE32_ALPHABET_RFC4648);
// The 32 bytes with offset 1-33 represent the public key
memcpy(out_bytes, &decoded[1], 32);
memzero(decoded, sizeof(decoded));
return true;
}
/*
* CRC16 implementation compatible with the Stellar version
* Ported from this implementation:
* http://introcs.cs.princeton.edu/java/61data/CRC16CCITT.java.html Initial
* value changed to 0x0000 to match Stellar
*/
uint16_t stellar_crc16(uint8_t *bytes, uint32_t length) {
// Calculate checksum for existing bytes
uint16_t crc = 0x0000;
uint16_t polynomial = 0x1021;
uint32_t i = 0;
uint8_t bit = 0;
uint8_t byte = 0;
uint8_t bitidx = 0;
uint8_t c15 = 0;
for (i = 0; i < length; i++) {
byte = bytes[i];
for (bitidx = 0; bitidx < 8; bitidx++) {
bit = ((byte >> (7 - bitidx) & 1) == 1);
c15 = ((crc >> 15 & 1) == 1);
crc <<= 1;
if (c15 ^ bit) crc ^= polynomial;
}
}
return crc & 0xffff;
}
/*
* Derives the HDNode at the given index
* Standard Stellar prefix is m/44'/148'/ and the default account is
* m/44'/148'/0'
*
* All paths must be hardened
*/
const HDNode *stellar_deriveNode(const uint32_t *address_n,
size_t address_n_count) {
static CONFIDENTIAL HDNode node;
const char *curve = "ed25519";
// Device not initialized, passphrase request cancelled, or unsupported curve
if (!config_getRootNode(&node, curve)) {
return 0;
}
// Failed to derive private key
if (hdnode_private_ckd_cached(&node, address_n, address_n_count, NULL) == 0) {
return 0;
}
if (hdnode_fill_public_key(&node) != 0) {
return 0;
}
return &node;
}
void stellar_hashupdate_uint32(uint32_t value) {
// Ensure uint32 is big endian
#if BYTE_ORDER == LITTLE_ENDIAN
REVERSE32(value, value);
#endif
// Byte values must be hashed as big endian
uint8_t data[4] = {0};
data[3] = (value >> 24) & 0xFF;
data[2] = (value >> 16) & 0xFF;
data[1] = (value >> 8) & 0xFF;
data[0] = value & 0xFF;
stellar_hashupdate_bytes(data, sizeof(data));
}
void stellar_hashupdate_uint64(uint64_t value) {
// Ensure uint64 is big endian
#if BYTE_ORDER == LITTLE_ENDIAN
REVERSE64(value, value);
#endif
// Byte values must be hashed as big endian
uint8_t data[8] = {0};
data[7] = (value >> 56) & 0xFF;
data[6] = (value >> 48) & 0xFF;
data[5] = (value >> 40) & 0xFF;
data[4] = (value >> 32) & 0xFF;
data[3] = (value >> 24) & 0xFF;
data[2] = (value >> 16) & 0xFF;
data[1] = (value >> 8) & 0xFF;
data[0] = value & 0xFF;
stellar_hashupdate_bytes(data, sizeof(data));
}
void stellar_hashupdate_bool(bool value) {
if (value) {
stellar_hashupdate_uint32(1);
} else {
stellar_hashupdate_uint32(0);
}
}
void stellar_hashupdate_string(const uint8_t *data, size_t len) {
// Hash the length of the string
stellar_hashupdate_uint32((uint32_t)len);
// Hash the raw bytes of the string
stellar_hashupdate_bytes(data, len);
// If len isn't a multiple of 4, add padding bytes
int remainder = len % 4;
uint8_t null_byte[1] = {0x00};
if (remainder) {
while (remainder < 4) {
stellar_hashupdate_bytes(null_byte, 1);
remainder++;
}
}
}
void stellar_hashupdate_address(const uint8_t *address_bytes) {
// First 4 bytes of an address are the type. There's only one type (0)
stellar_hashupdate_uint32(0);
// Remaining part of the address is 32 bytes
stellar_hashupdate_bytes(address_bytes, 32);
}
/*
* Note about string handling below: this field is an XDR "opaque" field and not
* a typical string, so if "TEST" is the asset code then the hashed value needs
* to be 4 bytes and not include the null at the end of the string
*/
void stellar_hashupdate_asset(const StellarAsset *asset) {
stellar_hashupdate_uint32(asset->type);
// For non-native assets, validate issuer account and convert to bytes
uint8_t issuer_bytes[STELLAR_KEY_SIZE] = {0};
if (asset->type != StellarAssetType_NATIVE &&
!stellar_getAddressBytes(asset->issuer, issuer_bytes)) {
stellar_signingFail(_("Invalid asset issuer"));
return;
}
// 4-character asset code
if (asset->type == StellarAssetType_ALPHANUM4) {
char code4[4 + 1] = {0};
memzero(code4, sizeof(code4));
strlcpy(code4, asset->code, sizeof(code4));
stellar_hashupdate_bytes((uint8_t *)code4, 4);
stellar_hashupdate_address(issuer_bytes);
}
// 12-character asset code
if (asset->type == StellarAssetType_ALPHANUM12) {
char code12[12 + 1] = {0};
memzero(code12, sizeof(code12));
strlcpy(code12, asset->code, sizeof(code12));
stellar_hashupdate_bytes((uint8_t *)code12, 12);
stellar_hashupdate_address(issuer_bytes);
}
}
void stellar_hashupdate_bytes(const uint8_t *data, size_t len) {
sha256_Update(&(stellar_activeTx.sha256_ctx), data, len);
}
/*
* Displays a summary of the overall transaction
*/
void stellar_layoutTransactionSummary(const StellarSignTx *msg) {
char str_lines[5][32] = {0};
memzero(str_lines, sizeof(str_lines));
char str_fee[12] = {0};
char str_num_ops[12] = {0};
// Will be set to true for some large hashes that don't fit on one screen
uint8_t needs_memo_hash_confirm = 0;
// Format the fee
stellar_format_stroops(msg->fee, str_fee, sizeof(str_fee));
strlcpy(str_lines[0], _("Fee: "), sizeof(str_lines[0]));
strlcat(str_lines[0], str_fee, sizeof(str_lines[0]));
strlcat(str_lines[0], _(" XLM"), sizeof(str_lines[0]));
// add in numOperations
stellar_format_uint32(msg->num_operations, str_num_ops, sizeof(str_num_ops));
strlcat(str_lines[0], _(" ("), sizeof(str_lines[0]));
strlcat(str_lines[0], str_num_ops, sizeof(str_lines[0]));
if (msg->num_operations == 1) {
strlcat(str_lines[0], _(" op)"), sizeof(str_lines[0]));
} else {
strlcat(str_lines[0], _(" ops)"), sizeof(str_lines[0]));
}
// Display full address being used to sign transaction
const char **str_addr_rows =
stellar_lineBreakAddress(stellar_activeTx.signing_pubkey);
stellar_layoutTransactionDialog(str_lines[0], _("Signing with:"),
str_addr_rows[0], str_addr_rows[1],
str_addr_rows[2]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return;
}
// Reset lines for displaying memo
memzero(str_lines, sizeof(str_lines));
switch (msg->memo_type) {
case StellarMemoType_NONE:
strlcpy(str_lines[0], _("[No Memo Set]"), sizeof(str_lines[0]));
strlcpy(str_lines[1], _("Important:"), sizeof(str_lines[0]));
strlcpy(str_lines[2], _("Many exchanges require"), sizeof(str_lines[0]));
strlcpy(str_lines[3], _("a memo when depositing."), sizeof(str_lines[0]));
break;
case StellarMemoType_TEXT:
strlcpy(str_lines[0], _("Memo (TEXT)"), sizeof(str_lines[0]));
// Split 28-character string into two lines of 19 / 9
// todo: word wrap method?
strlcpy(str_lines[1], (const char *)msg->memo_text, 19 + 1);
strlcpy(str_lines[2], (const char *)(msg->memo_text + 19), 9 + 1);
break;
case StellarMemoType_ID:
strlcpy(str_lines[0], _("Memo (ID)"), sizeof(str_lines[0]));
stellar_format_uint64(msg->memo_id, str_lines[1], sizeof(str_lines[1]));
break;
case StellarMemoType_HASH:
needs_memo_hash_confirm = 1;
strlcpy(str_lines[0], _("Memo (HASH)"), sizeof(str_lines[0]));
break;
case StellarMemoType_RETURN:
needs_memo_hash_confirm = 1;
strlcpy(str_lines[0], _("Memo (RETURN)"), sizeof(str_lines[0]));
break;
default:
stellar_signingFail(_("Stellar invalid memo type"));
return;
}
if (needs_memo_hash_confirm) {
data2hex(msg->memo_hash.bytes + 0, 8, str_lines[1]);
data2hex(msg->memo_hash.bytes + 8, 8, str_lines[2]);
data2hex(msg->memo_hash.bytes + 16, 8, str_lines[3]);
data2hex(msg->memo_hash.bytes + 24, 8, str_lines[4]);
}
stellar_layoutTransactionDialog(str_lines[0], str_lines[1], str_lines[2],
str_lines[3], str_lines[4]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return;
}
// Verify timebounds, if present
memzero(str_lines, sizeof(str_lines));
// Timebound: lower
time_t timebound;
char str_timebound[32] = {0};
const struct tm *tm = NULL;
timebound = (time_t)msg->timebounds_start;
strlcpy(str_lines[0], _("Valid from:"), sizeof(str_lines[0]));
if (timebound) {
tm = gmtime(&timebound);
strftime(str_timebound, sizeof(str_timebound), "%F %T (UTC)", tm);
strlcpy(str_lines[1], str_timebound, sizeof(str_lines[1]));
} else {
strlcpy(str_lines[1], _("[no restriction]"), sizeof(str_lines[1]));
}
// Reset for timebound_max
memzero(str_timebound, sizeof(str_timebound));
timebound = (time_t)msg->timebounds_end;
strlcpy(str_lines[2], _("Valid to:"), sizeof(str_lines[2]));
if (timebound) {
tm = gmtime(&timebound);
strftime(str_timebound, sizeof(str_timebound), "%F %T (UTC)", tm);
strlcpy(str_lines[3], str_timebound, sizeof(str_lines[3]));
} else {
strlcpy(str_lines[3], _("[no restriction]"), sizeof(str_lines[3]));
}
stellar_layoutTransactionDialog(_("Confirm Time Bounds"), str_lines[0],
str_lines[1], str_lines[2], str_lines[3]);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
stellar_signingFail(_("User canceled"));
return;
}
}
/*
* Most basic dialog used for signing
* - Header indicating which key is being used for signing
* - 5 rows for content
* - Cancel / Next buttons
* - Warning message can appear between cancel/next buttons
*/
void stellar_layoutSigningDialog(const char *line1, const char *line2,
const char *line3, const char *line4,
const char *line5, uint32_t *address_n,
size_t address_n_count, const char *warning,
bool is_final_step) {
// Start with some initial padding and use these to track position as
// rendering moves down the screen
int offset_x = 1;
int offset_y = 1;
int line_height = 9;
const HDNode *node = stellar_deriveNode(address_n, address_n_count);
if (!node) {
// abort on error
return;
}
char str_pubaddr_truncated[12]; // G???? + null
memzero(str_pubaddr_truncated, sizeof(str_pubaddr_truncated));
layoutLast = layoutDialogSwipe;
layoutSwipe();
oledClear();
// Load up public address
char str_pubaddr[56 + 1] = {0};
memzero(str_pubaddr, sizeof(str_pubaddr));
stellar_publicAddressAsStr(node->public_key + 1, str_pubaddr,
sizeof(str_pubaddr));
memcpy(str_pubaddr_truncated, str_pubaddr, sizeof(str_pubaddr_truncated) - 1);
// Header
// Ends up as: Signing with GABCDEFGHIJKL
char str_header[32] = {0};
memzero(str_header, sizeof(str_header));
strlcpy(str_header, _("Signing with "), sizeof(str_header));
strlcat(str_header, str_pubaddr_truncated, sizeof(str_header));
oledDrawString(offset_x, offset_y, str_header, FONT_STANDARD);
offset_y += line_height;
// Invert color on header
oledInvert(0, 0, OLED_WIDTH, offset_y - 2);
// Dialog contents begin
if (line1) {
oledDrawString(offset_x, offset_y, line1, FONT_STANDARD);
}
offset_y += line_height;
if (line2) {
oledDrawString(offset_x, offset_y, line2, FONT_STANDARD);
}
offset_y += line_height;
if (line3) {
oledDrawString(offset_x, offset_y, line3, FONT_STANDARD);
}
offset_y += line_height;
if (line4) {
oledDrawString(offset_x, offset_y, line4, FONT_STANDARD);
}
offset_y += line_height;
if (line5) {
oledDrawString(offset_x, offset_y, line5, FONT_STANDARD);
}
offset_y += line_height;
// Cancel button
layoutButtonNo(_("Cancel"), &bmp_btn_cancel);
// Warnings (drawn centered between the buttons
if (warning) {
oledDrawStringCenter(OLED_WIDTH / 2, OLED_HEIGHT - 8, warning,
FONT_STANDARD);
}
// Next / sign button
char str_next_label[8] = {0};
if (is_final_step) {
strlcpy(str_next_label, _("SIGN"), sizeof(str_next_label));
} else {
strlcpy(str_next_label, _("Next"), sizeof(str_next_label));
}
layoutButtonYes(str_next_label, &bmp_btn_confirm);
oledRefresh();
}
/*
* Main dialog helper method. Allows displaying 5 lines.
* A title showing the account being used to sign is always displayed.
*/
void stellar_layoutTransactionDialog(const char *line1, const char *line2,
const char *line3, const char *line4,
const char *line5) {
char str_warning[16] = {0};
memzero(str_warning, sizeof(str_warning));
if (stellar_activeTx.network_type == 2) {
// Warning: testnet
strlcpy(str_warning, _("WRN:TN"), sizeof(str_warning));
}
if (stellar_activeTx.network_type == 3) {
// Warning: private network
strlcpy(str_warning, _("WRN:PN"), sizeof(str_warning));
}
stellar_layoutSigningDialog(
line1, line2, line3, line4, line5, stellar_activeTx.address_n,
stellar_activeTx.address_n_count, str_warning, false);
}
bool stellar_path_check(uint32_t address_n_count, const uint32_t *address_n) {
// SEP-0005 for non-UTXO-based currencies, defined by Stellar:
// https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0005.md
// m/44'/coin_type'/account'
bool valid = (address_n_count == 3);
valid = valid && (address_n[0] == (PATH_HARDENED | 44));
valid = valid && (address_n[1] == (PATH_HARDENED | 148) ||
address_n[1] == (PATH_HARDENED | 1));
valid = valid && (address_n[2] & PATH_HARDENED);
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
return valid;
}
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