void fsm_msgSignMessage(SignMessage *msg)
{
RESP_INIT(MessageSignature);
layoutSignMessage(msg->message.bytes, msg->message.size);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Sign message cancelled");
layoutHome();
return;
}
if (!protectPin(true)) {
layoutHome();
return;
}
const CoinType *coin = fsm_getCoin(msg->coin_name);
if (!coin) return;
const HDNode *node = fsm_getDerivedNode(msg->address_n, msg->address_n_count);
if (!node) return;
layoutProgressSwipe("Signing", 0);
if (cryptoMessageSign(msg->message.bytes, msg->message.size, node->private_key, resp->signature.bytes) == 0) {
resp->has_address = true;
uint8_t addr_raw[21];
ecdsa_get_address_raw(node->public_key, coin->address_type, addr_raw);
base58_encode_check(addr_raw, 21, resp->address, sizeof(resp->address));
resp->has_signature = true;
resp->signature.size = 65;
msg_write(MessageType_MessageType_MessageSignature, resp);
} else {
fsm_sendFailure(FailureType_Failure_Other, "Error signing message");
}
layoutHome();
}
void fsm_msgSignMessage(SignMessage *msg)
{
RESP_INIT(MessageSignature);
if (!storage_is_initialized())
{
fsm_sendFailure(FailureType_Failure_NotInitialized, "Device not initialized");
return;
}
if(!confirm(ButtonRequestType_ButtonRequest_SignMessage, "Sign Message",
(char *)msg->message.bytes))
{
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Sign message cancelled");
go_home();
return;
}
if(!pin_protect_cached())
{
go_home();
return;
}
const CoinType *coin = fsm_getCoin(msg->coin_name);
if(!coin) { return; }
const HDNode *node = fsm_getDerivedNode(msg->address_n, msg->address_n_count);
if(!node) { return; }
if(cryptoMessageSign(coin, msg->message.bytes, msg->message.size, node->private_key,
resp->signature.bytes) == 0)
{
resp->has_address = true;
uint8_t addr_raw[21];
ecdsa_get_address_raw(node->public_key, coin->address_type, addr_raw);
base58_encode_check(addr_raw, 21, resp->address, sizeof(resp->address));
resp->has_signature = true;
resp->signature.size = 65;
msg_write(MessageType_MessageType_MessageSignature, resp);
}
else
{
fsm_sendFailure(FailureType_Failure_Other, "Error signing message");
}
go_home();
}
void fsm_msgSignIdentity(SignIdentity *msg)
{
RESP_INIT(SignedIdentity);
layoutSignIdentity(&(msg->identity), msg->has_challenge_visual ? msg->challenge_visual : 0);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Sign identity cancelled");
layoutHome();
return;
}
if (!protectPin(true)) {
layoutHome();
return;
}
uint8_t hash[32];
if (!msg->has_identity || cryptoIdentityFingerprint(&(msg->identity), hash) == 0) {
fsm_sendFailure(FailureType_Failure_Other, "Invalid identity");
layoutHome();
return;
}
uint32_t address_n[5];
address_n[0] = 0x80000000 | 13;
address_n[1] = 0x80000000 | hash[ 0] | (hash[ 1] << 8) | (hash[ 2] << 16) | (hash[ 3] << 24);
address_n[2] = 0x80000000 | hash[ 4] | (hash[ 5] << 8) | (hash[ 6] << 16) | (hash[ 7] << 24);
address_n[3] = 0x80000000 | hash[ 8] | (hash[ 9] << 8) | (hash[10] << 16) | (hash[11] << 24);
address_n[4] = 0x80000000 | hash[12] | (hash[13] << 8) | (hash[14] << 16) | (hash[15] << 24);
const HDNode *node = fsm_getDerivedNode(address_n, 5);
if (!node) return;
uint8_t public_key[33]; // copy public key to temporary buffer
memcpy(public_key, node->public_key, sizeof(public_key));
if (msg->has_ecdsa_curve_name) {
const ecdsa_curve *curve = get_curve_by_name(msg->ecdsa_curve_name);
if (curve) {
// correct public key (since fsm_getDerivedNode uses secp256k1 curve)
ecdsa_get_public_key33(curve, node->private_key, public_key);
}
}
bool sign_ssh = msg->identity.has_proto && (strcmp(msg->identity.proto, "ssh") == 0);
int result = 0;
layoutProgressSwipe("Signing", 0);
if (sign_ssh) { // SSH does not sign visual challenge
result = sshMessageSign(msg->challenge_hidden.bytes, msg->challenge_hidden.size, node->private_key, resp->signature.bytes);
} else {
uint8_t digest[64];
sha256_Raw(msg->challenge_hidden.bytes, msg->challenge_hidden.size, digest);
sha256_Raw((const uint8_t *)msg->challenge_visual, strlen(msg->challenge_visual), digest + 32);
result = cryptoMessageSign(digest, 64, node->private_key, resp->signature.bytes);
}
if (result == 0) {
if (sign_ssh) {
resp->has_address = false;
} else {
resp->has_address = true;
uint8_t addr_raw[21];
ecdsa_get_address_raw(node->public_key, 0x00, addr_raw); // hardcoded Bitcoin address type
base58_encode_check(addr_raw, 21, resp->address, sizeof(resp->address));
}
resp->has_public_key = true;
resp->public_key.size = 33;
memcpy(resp->public_key.bytes, public_key, 33);
resp->has_signature = true;
resp->signature.size = 65;
msg_write(MessageType_MessageType_SignedIdentity, resp);
} else {
fsm_sendFailure(FailureType_Failure_Other, "Error signing identity");
}
layoutHome();
}