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Refactored signing method.

Browse Source 
Put larger pieces of codes into functions of their own.
No changes to this code.
pull/25/head
Jochen Hoenicke 7 years ago
parent 9d9377438c
commit 420471889d
1 changed files with 357 additions and 306 deletions
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663
firmware/signing.c
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@ -66,7 +66,7 @@ static uint32_t in_address_n[8];
static size_t in_address_n_count;
/* progress_step/meta_step are fixed point numbers, giving the
/* progress_step/meta_step are fixed point numbers, giving the
* progress per input in permille with these many additional bits.
*/
#define PROGRESS_PRECISION 16
@ -86,8 +86,9 @@ Phase1 - check inputs, previous transactions, and outputs
foreach I (idx1):
Request I STAGE_REQUEST_1_INPUT
Add I to TransactionChecksum
Calculate amount of I:
Add I to segwit hash_prevouts, hash_sequence
Add I to TransactionChecksum (prevout and type)
If not segwit, Calculate amount of I:
Request prevhash I, META STAGE_REQUEST_2_PREV_META
foreach prevhash I (idx2):
Request prevhash I STAGE_REQUEST_2_PREV_INPUT
@ -109,27 +110,43 @@ Phase2: sign inputs, check that nothing changed
===============================================
foreach I (idx1): // input to sign
foreach I (idx2):
Request I STAGE_REQUEST_4_INPUT
If idx1 == idx2
Remember key for signing
Fill scriptsig
Add I to StreamTransactionSign
Add I to TransactionChecksum
foreach O (idx2):
Request O STAGE_REQUEST_4_OUTPUT
Add O to StreamTransactionSign
Add O to TransactionChecksum
Compare TransactionChecksum with checksum computed in Phase 1
If different:
Failure
Sign StreamTransactionSign
Return signed chunk
if (idx1 is segwit)
Request I STAGE_REQUEST_SEGWIT_INPUT
Return serialized input chunk
else
foreach I (idx2):
Request I STAGE_REQUEST_4_INPUT
If idx1 == idx2
Remember key for signing
Fill scriptsig
Add I to StreamTransactionSign
Add I to TransactionChecksum
foreach O (idx2):
Request O STAGE_REQUEST_4_OUTPUT
Add O to StreamTransactionSign
Add O to TransactionChecksum
Compare TransactionChecksum with checksum computed in Phase 1
If different:
Failure
Sign StreamTransactionSign
Return signed chunk
foreach O (idx1):
Request O STAGE_REQUEST_5_OUTPUT
Rewrite change address
Return O
Phase3: sign segwit inputs, check that nothing changed
===============================================
foreach I (idx1): // input to sign
Request I STAGE_REQUEST_SEGWIT_WITNESS
Check amount
Sign segwit prevhash, sequence, amount, outputs
Return witness
*/
void send_req_1_input(void)
@ -404,6 +421,309 @@ void signing_init(uint32_t _inputs_count, uint32_t _outputs_count, const CoinTyp
#define MIN(a,b) (((a)<(b))?(a):(b))
static bool signing_check_input(TxInputType *txinput) {
/* compute multisig fingerprint */
/* (if all input share the same fingerprint, outputs having the same fingerprint will be considered as change outputs) */
if (txinput->has_multisig && !multisig_fp_mismatch
&& txinput->script_type == InputScriptType_SPENDMULTISIG) {
uint8_t h[32];
if (cryptoMultisigFingerprint(&txinput->multisig, h) == 0) {
fsm_sendFailure(FailureType_Failure_Other, "Error computing multisig fingerprint");
signing_abort();
return false;
}
if (multisig_fp_set) {
if (memcmp(multisig_fp, h, 32) != 0) {
multisig_fp_mismatch = true;
}
} else {
memcpy(multisig_fp, h, 32);
multisig_fp_set = true;
}
} else { // single signature
multisig_fp_mismatch = true;
}
// remember the input bip32 path
// change addresses must use the same bip32 path as all inputs
set_input_bip32_path(txinput);
// compute segwit hashPrevouts & hashSequence
tx_prevout_hash(&hashers[0], txinput);
tx_sequence_hash(&hashers[1], txinput);
// hash prevout and script type to check it later (relevant for fee computation)
tx_prevout_hash(&hashers[2], txinput);
sha256_Update(&hashers[2], &txinput->script_type, sizeof(&txinput->script_type));
return true;
}
// check if the hash of the prevtx matches
static bool signing_check_prevtx_hash(void) {
uint8_t hash[32];
tx_hash_final(&tp, hash, true);
if (memcmp(hash, input.prev_hash.bytes, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Encountered invalid prevhash");
signing_abort();
return false;
}
phase1_request_next_input();
return true;
}
static bool signing_check_output(TxOutputType *txoutput) {
// Phase1: Check outputs
// add it to hash_outputs
// ask user for permission
// check for change address
bool is_change = false;
if (txoutput->address_n_count > 0) {
if (txoutput->has_address) {
fsm_sendFailure(FailureType_Failure_Other, "Address in change output");
signing_abort();
return false;
}
if (txoutput->script_type == OutputScriptType_PAYTOMULTISIG) {
uint8_t h[32];
if (!multisig_fp_set || multisig_fp_mismatch
|| cryptoMultisigFingerprint(&(txoutput->multisig), h) == 0
|| memcmp(multisig_fp, h, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Invalid multisig change address");
signing_abort();
return false;
}
is_change = check_change_bip32_path(txoutput);
} else if (txoutput->script_type == OutputScriptType_PAYTOADDRESS
|| ((txoutput->script_type == OutputScriptType_PAYTOWITNESS
|| txoutput->script_type == OutputScriptType_PAYTOP2SHWITNESS)
&& txoutput->amount < segwit_to_spend)) {
is_change = check_change_bip32_path(txoutput);
}
}
if (is_change) {
if (change_spend == 0) { // not set
change_spend = txoutput->amount;
} else {
fsm_sendFailure(FailureType_Failure_Other, "Only one change output allowed");
signing_abort();
return false;
}
}
if (spending + txoutput->amount < spending) {
fsm_sendFailure(FailureType_Failure_Other, "Value overflow");
signing_abort();
return false;
}
spending += txoutput->amount;
int co = compile_output(coin, root, txoutput, &bin_output, !is_change);
if (!is_change) {
layoutProgress("Signing transaction", progress);
}
if (co < 0) {
fsm_sendFailure(FailureType_Failure_Other, "Signing cancelled by user");
signing_abort();
return false;
} else if (co == 0) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to compile output");
signing_abort();
return false;
}
// compute segwit hashOuts
tx_output_hash(&hashers[0], &bin_output);
return true;
}
static bool signing_check_fee(void) {
// check fees
if (spending > to_spend) {
fsm_sendFailure(FailureType_Failure_NotEnoughFunds, "Not enough funds");
layoutHome();
return false;
}
uint64_t fee = to_spend - spending;
uint32_t tx_est_size = transactionEstimateSizeKb(inputs_count, outputs_count);
if (fee > (uint64_t)tx_est_size * coin->maxfee_kb) {
layoutFeeOverThreshold(coin, fee, tx_est_size);
if (!protectButton(ButtonRequestType_ButtonRequest_FeeOverThreshold, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Fee over threshold. Signing cancelled.");
layoutHome();
return false;
}
layoutProgress("Signing transaction", progress);
}
// last confirmation
layoutConfirmTx(coin, to_spend - change_spend, fee);
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Signing cancelled by user");
signing_abort();
return false;
}
return true;
}
static void phase1_request_next_output(void) {
if (idx1 < outputs_count - 1) {
idx1++;
send_req_3_output();
} else {
sha256_Final(&hashers[0], hash_outputs);
sha256_Raw(hash_outputs, 32, hash_outputs);
if (!signing_check_fee()) {
return;
}
// Everything was checked, now phase 2 begins and the transaction is signed.
progress_meta_step = progress_step / (inputs_count + outputs_count);
layoutProgress("Signing transaction", progress);
idx1 = 0;
phase2_request_next_input();
}
}
static bool signing_sign_input(void) {
uint8_t hash[32];
sha256_Final(&hashers[0], hash);
sha256_Raw(hash, 32, hash);
if (memcmp(hash, hash_outputs, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Transaction has changed during signing");
signing_abort();
return false;
}
tx_hash_final(&ti, hash, false);
resp.has_serialized = true;
resp.serialized.has_signature_index = true;
resp.serialized.signature_index = idx1;
resp.serialized.has_signature = true;
resp.serialized.has_serialized_tx = true;
if (ecdsa_sign_digest(&secp256k1, privkey, hash, sig, NULL, NULL) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Signing failed");
signing_abort();
return false;
}
resp.serialized.signature.size = ecdsa_sig_to_der(sig, resp.serialized.signature.bytes);
if (input.has_multisig) {
// fill in the signature
int pubkey_idx = cryptoMultisigPubkeyIndex(&(input.multisig), pubkey);
if (pubkey_idx < 0) {
fsm_sendFailure(FailureType_Failure_Other, "Pubkey not found in multisig script");
signing_abort();
return false;
}
memcpy(input.multisig.signatures[pubkey_idx].bytes, resp.serialized.signature.bytes, resp.serialized.signature.size);
input.multisig.signatures[pubkey_idx].size = resp.serialized.signature.size;
input.script_sig.size = serialize_script_multisig(&(input.multisig), input.script_sig.bytes);
if (input.script_sig.size == 0) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize multisig script");
signing_abort();
return false;
}
} else { // SPENDADDRESS
input.script_sig.size = serialize_script_sig(resp.serialized.signature.bytes, resp.serialized.signature.size, pubkey, 33, input.script_sig.bytes);
}
resp.serialized.serialized_tx.size = tx_serialize_input(&to, &input, resp.serialized.serialized_tx.bytes);
return true;
}
static bool signing_sign_segwit_input(TxInputType *txinput) {
// idx1: index to sign
uint8_t hash[32];
uint32_t sighash = 1;
if (txinput->script_type == InputScriptType_SPENDWITNESS
|| txinput->script_type == InputScriptType_SPENDP2SHWITNESS) {
if (!compile_input_script_sig(txinput)) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to compile input");
signing_abort();
return false;
}
if (txinput->amount > segwit_to_spend) {
fsm_sendFailure(FailureType_Failure_Other, "Transaction has changed during signing");
signing_abort();
return false;
}
segwit_to_spend -= txinput->amount;
sha256_Init(&hashers[0]);
sha256_Update(&hashers[0], (const uint8_t *)&version, 4);
sha256_Update(&hashers[0], hash_prevouts, 32);
sha256_Update(&hashers[0], hash_sequence, 32);
tx_prevout_hash(&hashers[0], txinput);
tx_script_hash(&hashers[0], txinput->script_sig.size, txinput->script_sig.bytes);
sha256_Update(&hashers[0], (const uint8_t*) &txinput->amount, 8);
tx_sequence_hash(&hashers[0], txinput);
sha256_Update(&hashers[0], hash_outputs, 32);
sha256_Update(&hashers[0], (const uint8_t*) &lock_time, 4);
sha256_Update(&hashers[0], (const uint8_t*) &sighash, 4);
sha256_Final(&hashers[0], hash);
sha256_Raw(hash, 32, hash);
resp.has_serialized = true;
resp.serialized.has_signature_index = true;
resp.serialized.signature_index = idx1;
resp.serialized.has_signature = true;
resp.serialized.has_serialized_tx = true;
if (ecdsa_sign_digest(&secp256k1, node.private_key, hash, sig, NULL, NULL) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Signing failed");
signing_abort();
return false;
}
resp.serialized.signature.size = ecdsa_sig_to_der(sig, resp.serialized.signature.bytes);
if (txinput->has_multisig) {
uint32_t r, i, script_len;
int nwitnesses;
// fill in the signature
int pubkey_idx = cryptoMultisigPubkeyIndex(&(txinput->multisig), node.public_key);
if (pubkey_idx < 0) {
fsm_sendFailure(FailureType_Failure_Other, "Pubkey not found in multisig script");
signing_abort();
return false;
}
memcpy(txinput->multisig.signatures[pubkey_idx].bytes, resp.serialized.signature.bytes, resp.serialized.signature.size);
txinput->multisig.signatures[pubkey_idx].size = resp.serialized.signature.size;
r = 1; // skip number of items (filled in later)
resp.serialized.serialized_tx.bytes[r] = 0; r++;
nwitnesses = 2;
for (i = 0; i < txinput->multisig.signatures_count; i++) {
if (txinput->multisig.signatures[i].size == 0) {
continue;
}
nwitnesses++;
txinput->multisig.signatures[i].bytes[txinput->multisig.signatures[i].size] = 1;
r += tx_serialize_script(txinput->multisig.signatures[i].size + 1, txinput->multisig.signatures[i].bytes, resp.serialized.serialized_tx.bytes + r);
}
script_len = compile_script_multisig(&txinput->multisig, 0);
r += ser_length(script_len, resp.serialized.serialized_tx.bytes + r);
r += compile_script_multisig(&txinput->multisig, resp.serialized.serialized_tx.bytes + r);
resp.serialized.serialized_tx.bytes[0] = nwitnesses;
resp.serialized.serialized_tx.size = r;
} else { // single signature
uint32_t r = 0;
r += ser_length(2, resp.serialized.serialized_tx.bytes + r);
resp.serialized.signature.bytes[resp.serialized.signature.size] = 1;
r += tx_serialize_script(resp.serialized.signature.size + 1, resp.serialized.signature.bytes, resp.serialized.serialized_tx.bytes + r);
r += tx_serialize_script(33, node.public_key, resp.serialized.serialized_tx.bytes + r);
resp.serialized.serialized_tx.size = r;
}
} else {
// empty witness
resp.has_serialized = true;
resp.serialized.has_signature_index = false;
resp.serialized.has_signature = false;
resp.serialized.has_serialized_tx = true;
resp.serialized.serialized_tx.bytes[0] = 0;
resp.serialized.serialized_tx.size = 1;
}
// if last witness add tx footer
if (idx1 == inputs_count - 1) {
uint32_t r = resp.serialized.serialized_tx.size;
r += tx_serialize_footer(&to, resp.serialized.serialized_tx.bytes + r);
resp.serialized.serialized_tx.size = r;
}
return true;
}
void signing_txack(TransactionType *tx)
{
if (!signing) {
@ -423,38 +743,11 @@ void signing_txack(TransactionType *tx)
switch (signing_stage) {
case STAGE_REQUEST_1_INPUT:
/* compute multisig fingerprint */
/* (if all input share the same fingerprint, outputs having the same fingerprint will be considered as change outputs) */
if (tx->inputs[0].has_multisig && !multisig_fp_mismatch
&& tx->inputs[0].script_type == InputScriptType_SPENDMULTISIG) {
uint8_t h[32];
if (cryptoMultisigFingerprint(&(tx->inputs[0].multisig), h) == 0) {
fsm_sendFailure(FailureType_Failure_Other, "Error computing multisig fingerprint");
signing_abort();
return;
}
if (multisig_fp_set) {
if (memcmp(multisig_fp, h, 32) != 0) {
multisig_fp_mismatch = true;
}
} else {
memcpy(multisig_fp, h, 32);
multisig_fp_set = true;
}
} else { // single signature
multisig_fp_mismatch = true;
}
// remember the input bip32 path
// change addresses must use the same bip32 path as all inputs
set_input_bip32_path(&tx->inputs[0]);
// compute segwit hashPrevouts & hashSequence
tx_prevout_hash(&hashers[0], &tx->inputs[0]);
tx_sequence_hash(&hashers[1], &tx->inputs[0]);
// hash prevout and script type to check it later (relevant for fee computation)
tx_prevout_hash(&hashers[2], &tx->inputs[0]);
sha256_Update(&hashers[2], &tx->inputs[0].script_type, sizeof(&tx->inputs[0].script_type));
signing_check_input(&tx->inputs[0]);
if (tx->inputs[0].script_type == InputScriptType_SPENDMULTISIG
|| tx->inputs[0].script_type == InputScriptType_SPENDADDRESS) {
// remember the first non-segwit input -- this is the first input
// we need to sign during phase2
if (next_nonsegwit_input == 0xffffffff)
next_nonsegwit_input = idx1;
memcpy(&input, tx->inputs, sizeof(TxInputType));
@ -526,19 +819,12 @@ void signing_txack(TransactionType *tx)
/* Check prevtx of next input */
idx2++;
send_req_2_prev_output();
} else { // last output
uint8_t hash[32];
if (tp.extra_data_len > 0) { // has extra data
send_req_2_prev_extradata(0, MIN(1024, tp.extra_data_len));
return;
}
tx_hash_final(&tp, hash, true);
if (memcmp(hash, input.prev_hash.bytes, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Encountered invalid prevhash");
signing_abort();
return;
}
phase1_request_next_input();
} else if (tp.extra_data_len > 0) { // has extra data
send_req_2_prev_extradata(0, MIN(1024, tp.extra_data_len));
return;
} else {
/* prevtx is done */
signing_check_prevtx_hash();
}
return;
case STAGE_REQUEST_2_PREV_EXTRADATA:
@ -550,117 +836,15 @@ void signing_txack(TransactionType *tx)
if (tp.extra_data_received < tp.extra_data_len) { // still some data remanining
send_req_2_prev_extradata(tp.extra_data_received, MIN(1024, tp.extra_data_len - tp.extra_data_received));
} else {
/* Check next output */
uint8_t hash[32];
tx_hash_final(&tp, hash, true);
if (memcmp(hash, input.prev_hash.bytes, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Encountered invalid prevhash");
signing_abort();
return;
}
phase1_request_next_input();
signing_check_prevtx_hash();
}
return;
case STAGE_REQUEST_3_OUTPUT:
{
/* Downloaded output idx1 the first time.
* Add it to transaction check
* Ask for permission.
*/
bool is_change = false;
if (tx->outputs[0].address_n_count > 0) {
if (tx->outputs[0].has_address) {
fsm_sendFailure(FailureType_Failure_Other, "Address in change output");
signing_abort();
return;
}
if (tx->outputs[0].script_type == OutputScriptType_PAYTOMULTISIG) {
uint8_t h[32];
if (!multisig_fp_set || multisig_fp_mismatch
|| cryptoMultisigFingerprint(&(tx->outputs[0].multisig), h) == 0
|| memcmp(multisig_fp, h, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Invalid multisig change address");
signing_abort();
return;
}
is_change = check_change_bip32_path(&tx->outputs[0]);
} else if (tx->outputs[0].script_type == OutputScriptType_PAYTOADDRESS
|| ((tx->outputs[0].script_type == OutputScriptType_PAYTOWITNESS
|| tx->outputs[0].script_type == OutputScriptType_PAYTOP2SHWITNESS)
&& tx->outputs[0].amount < segwit_to_spend)) {
is_change = check_change_bip32_path(&tx->outputs[0]);
}
}
if (is_change) {
if (change_spend == 0) { // not set
change_spend = tx->outputs[0].amount;
} else {
fsm_sendFailure(FailureType_Failure_Other, "Only one change output allowed");
signing_abort();
return;
}
}
if (spending + tx->outputs[0].amount < spending) {
fsm_sendFailure(FailureType_Failure_Other, "Value overflow");
signing_abort();
return;
}
spending += tx->outputs[0].amount;
co = compile_output(coin, root, tx->outputs, &bin_output, !is_change);
if (!is_change) {
layoutProgress("Signing transaction", progress);
}
if (co < 0) {
fsm_sendFailure(FailureType_Failure_Other, "Signing cancelled by user");
signing_abort();
return;
} else if (co == 0) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to compile output");
signing_abort();
if (!signing_check_output(&tx->outputs[0])) {
return;
}
// compute segwit hashOuts
tx_output_hash(&hashers[0], &bin_output);
if (idx1 < outputs_count - 1) {
idx1++;
send_req_3_output();
} else {
sha256_Final(&hashers[0], hash_outputs);
sha256_Raw(hash_outputs, 32, hash_outputs);
// check fees
if (spending > to_spend) {
fsm_sendFailure(FailureType_Failure_NotEnoughFunds, "Not enough funds");
layoutHome();
return;
}
uint64_t fee = to_spend - spending;
uint32_t tx_est_size = transactionEstimateSizeKb(inputs_count, outputs_count);
if (fee > (uint64_t)tx_est_size * coin->maxfee_kb) {
layoutFeeOverThreshold(coin, fee, tx_est_size);
if (!protectButton(ButtonRequestType_ButtonRequest_FeeOverThreshold, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Fee over threshold. Signing cancelled.");
layoutHome();
return;
}
layoutProgress("Signing transaction", progress);
}
// last confirmation
layoutConfirmTx(coin, to_spend - change_spend, fee);
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Signing cancelled by user");
signing_abort();
return;
}
// Everything was checked, now phase 2 begins and the transaction is signed.
progress_meta_step = progress_step / (inputs_count + outputs_count);
layoutProgress("Signing transaction", progress);
idx1 = 0;
phase2_request_next_input();
}
phase1_request_next_output();
return;
}
case STAGE_REQUEST_4_INPUT:
progress = 500 + ((idx1 * progress_step + idx2 * progress_meta_step) >> PROGRESS_PRECISION);
if (idx2 == 0) {
@ -731,47 +915,9 @@ void signing_txack(TransactionType *tx)
idx2++;
send_req_4_output();
} else {
uint8_t hash[32];
sha256_Final(&hashers[0], hash);
sha256_Raw(hash, 32, hash);
if (memcmp(hash, hash_outputs, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Transaction has changed during signing");
signing_abort();
return;
}
tx_hash_final(&ti, hash, false);
resp.has_serialized = true;
resp.serialized.has_signature_index = true;
resp.serialized.signature_index = idx1;
resp.serialized.has_signature = true;
resp.serialized.has_serialized_tx = true;
if (ecdsa_sign_digest(&secp256k1, privkey, hash, sig, NULL, NULL) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Signing failed");
signing_abort();
if (!signing_sign_input()) {
return;
}
resp.serialized.signature.size = ecdsa_sig_to_der(sig, resp.serialized.signature.bytes);
if (input.has_multisig) {
// fill in the signature
int pubkey_idx = cryptoMultisigPubkeyIndex(&(input.multisig), pubkey);
if (pubkey_idx < 0) {
fsm_sendFailure(FailureType_Failure_Other, "Pubkey not found in multisig script");
signing_abort();
return;
}
memcpy(input.multisig.signatures[pubkey_idx].bytes, resp.serialized.signature.bytes, resp.serialized.signature.size);
input.multisig.signatures[pubkey_idx].size = resp.serialized.signature.size;
input.script_sig.size = serialize_script_multisig(&(input.multisig), input.script_sig.bytes);
if (input.script_sig.size == 0) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize multisig script");
signing_abort();
return;
}
} else { // SPENDADDRESS
input.script_sig.size = serialize_script_sig(resp.serialized.signature.bytes, resp.serialized.signature.size, pubkey, 33, input.script_sig.bytes);
}
resp.serialized.serialized_tx.size = tx_serialize_input(&to, &input, resp.serialized.serialized_tx.bytes);
// since this took a longer time, update progress
layoutProgress("Signing transaction", progress);
update_ctr = 0;
@ -855,104 +1001,10 @@ void signing_txack(TransactionType *tx)
return;
case STAGE_REQUEST_SEGWIT_WITNESS:
{
uint8_t hash[32];
uint32_t sighash = 1;
progress = 500 + ((idx1 * progress_step) >> PROGRESS_PRECISION);
if (tx->inputs[0].script_type == InputScriptType_SPENDWITNESS
|| tx->inputs[0].script_type == InputScriptType_SPENDP2SHWITNESS) {
if (!compile_input_script_sig(&tx->inputs[0])) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to compile input");
signing_abort();
return;
}
if (tx->inputs[0].amount > segwit_to_spend) {
fsm_sendFailure(FailureType_Failure_Other, "Transaction has changed during signing");
signing_abort();
return;
}
segwit_to_spend -= tx->inputs[0].amount;
sha256_Init(&hashers[0]);
sha256_Update(&hashers[0], (const uint8_t *)&version, 4);
sha256_Update(&hashers[0], hash_prevouts, 32);
sha256_Update(&hashers[0], hash_sequence, 32);
tx_prevout_hash(&hashers[0], &tx->inputs[0]);
tx_script_hash(&hashers[0], tx->inputs[0].script_sig.size, tx->inputs[0].script_sig.bytes);
sha256_Update(&hashers[0], (const uint8_t*) &tx->inputs[0].amount, 8);
tx_sequence_hash(&hashers[0], &tx->inputs[0]);
sha256_Update(&hashers[0], hash_outputs, 32);
sha256_Update(&hashers[0], (const uint8_t*) &lock_time, 4);
sha256_Update(&hashers[0], (const uint8_t*) &sighash, 4);
sha256_Final(&hashers[0], hash);
sha256_Raw(hash, 32, hash);
resp.has_serialized = true;
resp.serialized.has_signature_index = true;
resp.serialized.signature_index = idx1;
resp.serialized.has_signature = true;
resp.serialized.has_serialized_tx = true;
if (ecdsa_sign_digest(&secp256k1, node.private_key, hash, sig, NULL, NULL) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Signing failed");
signing_abort();
return;
}
resp.serialized.signature.size = ecdsa_sig_to_der(sig, resp.serialized.signature.bytes);
if (tx->inputs[0].has_multisig) {
uint32_t r, i, script_len;
int nwitnesses;
// fill in the signature
int pubkey_idx = cryptoMultisigPubkeyIndex(&(tx->inputs[0].multisig), node.public_key);
if (pubkey_idx < 0) {
fsm_sendFailure(FailureType_Failure_Other, "Pubkey not found in multisig script");
signing_abort();
return;
}
memcpy(tx->inputs[0].multisig.signatures[pubkey_idx].bytes, resp.serialized.signature.bytes, resp.serialized.signature.size);
tx->inputs[0].multisig.signatures[pubkey_idx].size = resp.serialized.signature.size;
r = 1; // skip number of items (filled in later)
resp.serialized.serialized_tx.bytes[r] = 0; r++;
nwitnesses = 2;
for (i = 0; i < tx->inputs[0].multisig.signatures_count; i++) {
if (tx->inputs[0].multisig.signatures[i].size == 0) {
continue;
}
nwitnesses++;
tx->inputs[0].multisig.signatures[i].bytes[tx->inputs[0].multisig.signatures[i].size] = 1;
r += tx_serialize_script(tx->inputs[0].multisig.signatures[i].size + 1, tx->inputs[0].multisig.signatures[i].bytes, resp.serialized.serialized_tx.bytes + r);
}
script_len = compile_script_multisig(&tx->inputs[0].multisig, 0);
r += ser_length(script_len, resp.serialized.serialized_tx.bytes + r);
r += compile_script_multisig(&tx->inputs[0].multisig, resp.serialized.serialized_tx.bytes + r);
resp.serialized.serialized_tx.bytes[0] = nwitnesses;
resp.serialized.serialized_tx.size = r;
} else { // single signature
uint32_t r = 0;
r += ser_length(2, resp.serialized.serialized_tx.bytes + r);
resp.serialized.signature.bytes[resp.serialized.signature.size] = 1;
r += tx_serialize_script(resp.serialized.signature.size + 1, resp.serialized.signature.bytes, resp.serialized.serialized_tx.bytes + r);
r += tx_serialize_script(33, node.public_key, resp.serialized.serialized_tx.bytes + r);
resp.serialized.serialized_tx.size = r;
}
} else {
// empty witness
resp.has_serialized = true;
resp.serialized.has_signature_index = false;
resp.serialized.has_signature = false;
resp.serialized.has_serialized_tx = true;
resp.serialized.serialized_tx.bytes[0] = 0;
resp.serialized.serialized_tx.size = 1;
}
if (idx1 == inputs_count - 1) {
uint32_t r = resp.serialized.serialized_tx.size;
r += tx_serialize_footer(&to, resp.serialized.serialized_tx.bytes + r);
resp.serialized.serialized_tx.size = r;
if (!signing_sign_segwit_input(&tx->inputs[0])) {
return;
}
// since this took a longer time, update progress
progress = 500 + ((idx1 * progress_step) >> PROGRESS_PRECISION);
layoutProgress("Signing transaction", progress);
update_ctr = 0;
if (idx1 < inputs_count - 1) {
@ -963,9 +1015,8 @@ void signing_txack(TransactionType *tx)
signing_abort();
}
return;
}
}
fsm_sendFailure(FailureType_Failure_Other, "Signing error");
signing_abort();
}

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