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trezor-mcu
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replace transaction check hashing

This commit is contained in:
Pavol Rusnak 2015-02-24 15:14:44 +01:00
parent 73c42402b9
commit 399d4d31b7
1 changed files with 18 additions and 26 deletions
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44
firmware/signing.c
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@ -46,7 +46,8 @@ static uint32_t idx1, idx2;
static TxRequest resp;
static TxInputType input;
static TxOutputBinType bin_output;
static TxStruct to, tp, ti, tc;
static TxStruct to, tp, ti;
static SHA256_CTX tc;
static uint8_t hash[32], hash_check[32], privkey[32], pubkey[33], sig[64];
static uint64_t to_spend, spending, change_spend;
const uint32_t version = 1;
@ -246,7 +247,11 @@ void signing_init(uint32_t _inputs_count, uint32_t _outputs_count, const CoinTyp
multisig_fp_mismatch = false;
tx_init(&to, inputs_count, outputs_count, version, lock_time, false);
tx_init(&tc, inputs_count, outputs_count, version, lock_time, false);
sha256_Init(&tc);
sha256_Update(&tc, (const uint8_t *)&inputs_count, sizeof(inputs_count));
sha256_Update(&tc, (const uint8_t *)&outputs_count, sizeof(outputs_count));
sha256_Update(&tc, (const uint8_t *)&version, sizeof(version));
sha256_Update(&tc, (const uint8_t *)&lock_time, sizeof(lock_time));
layoutProgressSwipe("Signing transaction", 0);
@ -295,11 +300,7 @@ void signing_txack(TransactionType *tx)
multisig_fp_set = true;
}
}
if (!tx_serialize_input_hash(&tc, tx->inputs)) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize input");
signing_abort();
return;
}
sha256_Update(&tc, (const uint8_t *)tx->inputs, sizeof(TxInputType));
memcpy(&input, tx->inputs, sizeof(TxInputType));
send_req_2_prev_meta();
return;
@ -401,17 +402,12 @@ void signing_txack(TransactionType *tx)
signing_abort();
return;
}
if (!tx_serialize_output_hash(&tc, &bin_output)) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize output");
signing_abort();
return;
}
sha256_Update(&tc, (const uint8_t *)&bin_output, sizeof(TxOutputBinType));
if (idx1 < outputs_count - 1) {
idx1++;
send_req_3_output();
} else {
tx_hash_final(&tc, hash_check, false);
sha256_Final(hash_check, &tc);
// check fees
if (spending > to_spend) {
fsm_sendFailure(FailureType_Failure_NotEnoughFunds, "Not enough funds");
@ -448,15 +444,15 @@ void signing_txack(TransactionType *tx)
progress = 500 + ((idx1 * progress_step + idx2 * progress_meta_step) >> PROGRESS_PRECISION);
if (idx2 == 0) {
tx_init(&ti, inputs_count, outputs_count, version, lock_time, true);
tx_init(&tc, inputs_count, outputs_count, version, lock_time, false);
sha256_Init(&tc);
sha256_Update(&tc, (const uint8_t *)&inputs_count, sizeof(inputs_count));
sha256_Update(&tc, (const uint8_t *)&outputs_count, sizeof(outputs_count));
sha256_Update(&tc, (const uint8_t *)&version, sizeof(version));
sha256_Update(&tc, (const uint8_t *)&lock_time, sizeof(lock_time));
memset(privkey, 0, 32);
memset(pubkey, 0, 33);
}
if (!tx_serialize_input_hash(&tc, tx->inputs)) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize input");
signing_abort();
return;
}
sha256_Update(&tc, (const uint8_t *)tx->inputs, sizeof(TxInputType));
if (idx2 == idx1) {
memcpy(&input, tx->inputs, sizeof(TxInputType));
memcpy(&node, root, sizeof(HDNode));
@ -511,11 +507,7 @@ void signing_txack(TransactionType *tx)
signing_abort();
return;
}
if (!tx_serialize_output_hash(&tc, &bin_output)) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize output");
signing_abort();
return;
}
sha256_Update(&tc, (const uint8_t *)&bin_output, sizeof(TxOutputBinType));
if (!tx_serialize_output_hash(&ti, &bin_output)) {
fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize output");
signing_abort();
@ -525,7 +517,7 @@ void signing_txack(TransactionType *tx)
idx2++;
send_req_4_output();
} else {
tx_hash_final(&tc, hash, false);
sha256_Final(hash, &tc);
if (memcmp(hash, hash_check, 32) != 0) {
fsm_sendFailure(FailureType_Failure_Other, "Transaction has changed during signing");
signing_abort();