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ringct: do not serialize what can be reconstructed

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The mixRing (output keys and commitments) and II fields (key images)
can be reconstructed from vin data.
This saves some modest amount of space in the tx.
This commit is contained in:
moneromooo-monero
2016-06-29 18:18:18 +01:00
parent 106e3dc3d4
commit 20e50ec7f7
8 changed files with 148 additions and 74 deletions
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13
src/wallet/wallet2.cpp
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@@ -3237,16 +3237,19 @@ static size_t estimate_rct_tx_size(int n_inputs, int mixin, int n_outputs)
// rangeSigs
size += (2*64*32+32+64*32) * n_outputs;
// MG
size += 32 * (mixin+1) * n_inputs + 32 + 32 * n_inputs;
// mixRing
size += 2 * 32 * (mixin+1) * n_inputs;
// MG - only the last slot of II is saved, the rest can be reconstructed
size += 32 * (mixin+1) * n_inputs + 32 + 32 * (/*n_inputs+*/1) ;
// mixRing - not serialized, can be reconstructed
/* size += 2 * 32 * (mixin+1) * n_inputs; */
// ecdhInfo
size += 3 * 32 * n_outputs;
// outPk
size += 2 * 32 * n_outputs;
LOG_PRINT_L2("estimated rct tx size for " << n_inputs << " at mixin " << mixin << " and " << n_outputs << ": " << size);
LOG_PRINT_L2("estimated rct tx size for " << n_inputs << " at mixin " << mixin << " and " << n_outputs << ": " << size << " (" << (32 * n_inputs + 2 * 32 * (mixin+1) * n_inputs) << " saved)");
return size;
}