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simplify bip32 change logic

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This commit is contained in:
Pavol Rusnak 2017-05-05 14:37:40 +02:00
parent b1995bb8d1
commit e31e55e505
No known key found for this signature in database
GPG Key ID: 91F3B339B9A02A3D
1 changed files with 30 additions and 21 deletions
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33
firmware/signing.c
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@ -319,8 +319,11 @@ void phase2_request_next_input(void)
}
}
void set_input_bip32_path(const TxInputType *tinput)
void extract_input_bip32_path(const TxInputType *tinput)
{
if (in_address_n_count == (size_t) -1) {
return;
}
size_t count = tinput->address_n_count;
if (count < 1) {
// no change address allowed
@ -333,7 +336,8 @@ void set_input_bip32_path(const TxInputType *tinput)
if (count > 2) { // if longer than 2 elements, store first N - 2
memcpy(in_address_n, tinput->address_n, (count - 2) * sizeof(uint32_t));
}
} else {
return;
}
// check whether they are same length
if (in_address_n_count != count) {
in_address_n_count = (size_t) -1;
@ -345,28 +349,33 @@ void set_input_bip32_path(const TxInputType *tinput)
return;
}
}
}
#define MAX_BIP32_LAST_ELEMENT 1000000
bool check_change_bip32_path(const TxOutputType *toutput)
{
size_t count = toutput->address_n_count;
if (count < 1) {
if (count < 1 || in_address_n_count < 1) {
return 0;
}
if (count == 1) {
return in_address_n_count == 1 && toutput->address_n[0] < 1000000;
if (count != in_address_n_count) {
return 0;
}
if (toutput->address_n[count - 1] > MAX_BIP32_LAST_ELEMENT) {
return 0;
}
if (count >= 2) {
return in_address_n_count == count &&
0 == memcmp(in_address_n, toutput->address_n, (count - 2) * sizeof(uint32_t)) &&
toutput->address_n[count - 2] == 1 &&
toutput->address_n[count - 1] < 1000000;
if (0 != memcmp(in_address_n, toutput->address_n, (count - 2) * sizeof(uint32_t)) ||
toutput->address_n[count - 2] != 1) {
return 0;
}
}
return 0;
return 1;
}
bool compile_input_script_sig(TxInputType *tinput)
@ -463,7 +472,7 @@ static bool signing_check_input(TxInputType *txinput) {
}
// remember the input bip32 path
// change addresses must use the same bip32 path as all inputs
set_input_bip32_path(txinput);
extract_input_bip32_path(txinput);
// compute segwit hashPrevouts & hashSequence
tx_prevout_hash(&hashers[0], txinput);
tx_sequence_hash(&hashers[1], txinput);