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cryptonote: speed up calculating coinbase tx prunable hash 

It's a hash of an empty buffer, so we can avoid keccak
This commit is contained in:
moneromooo-monero 2018-11-23 12:11:51 +00:00
parent 238401d4e9
commit 9feda0eeba
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
1 changed files with 9 additions and 2 deletions
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7
src/cryptonote_basic/cryptonote_format_utils.cpp
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@ -981,10 +981,14 @@ namespace cryptonote
{
if (t.version == 1)
return false;
static const crypto::hash empty_hash = { (char)0x70, (char)0xa4, (char)0x85, (char)0x5d, (char)0x04, (char)0xd8, (char)0xfa, (char)0x7b, (char)0x3b, (char)0x27, (char)0x82, (char)0xca, (char)0x53, (char)0xb6, (char)0x00, (char)0xe5, (char)0xc0, (char)0x03, (char)0xc7, (char)0xdc, (char)0xb2, (char)0x7d, (char)0x7e, (char)0x92, (char)0x3c, (char)0x23, (char)0xf7, (char)0x86, (char)0x01, (char)0x46, (char)0xd2, (char)0xc5 };
const unsigned int unprunable_size = t.unprunable_size;
if (blob && unprunable_size)
{
CHECK_AND_ASSERT_MES(unprunable_size <= blob->size(), false, "Inconsistent transaction unprunable and blob sizes");
if (blob->size() - unprunable_size == 0)
res = empty_hash;
else
cryptonote::get_blob_hash(epee::span<const char>(blob->data() + unprunable_size, blob->size() - unprunable_size), res);
}
else
@ -997,6 +1001,9 @@ namespace cryptonote
const size_t mixin = t.vin.empty() ? 0 : t.vin[0].type() == typeid(txin_to_key) ? boost::get<txin_to_key>(t.vin[0]).key_offsets.size() - 1 : 0;
bool r = tt.rct_signatures.p.serialize_rctsig_prunable(ba, t.rct_signatures.type, inputs, outputs, mixin);
CHECK_AND_ASSERT_MES(r, false, "Failed to serialize rct signatures prunable");
if (ss.str().empty())
res = empty_hash;
else
cryptonote::get_blob_hash(ss.str(), res);
}
return true;