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ringct: make rctSigBase serialization follow strict aliasing rule #9035

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Nov 6, 2023
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ringct: make rctSigBase serialization follow strict aliasing rule #9035

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12 changes: 9 additions & 3 deletions src/ringct/rctTypes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -362,11 +362,17 @@ namespace rct {
{
if (type == RCTTypeBulletproof2 || type == RCTTypeCLSAG || type == RCTTypeBulletproofPlus)
{
// Since RCTTypeBulletproof2 enote types, we don't serialize the blinding factor, and only serialize the
// first 8 bytes of ecdhInfo[i].amount
ar.begin_object();
if (!typename Archive<W>::is_saving())
crypto::hash8 trunc_amount; // placeholder variable needed to maintain "strict aliasing"
if (!typename Archive<W>::is_saving()) // loading
memset(ecdhInfo[i].amount.bytes, 0, sizeof(ecdhInfo[i].amount.bytes));
crypto::hash8 &amount = (crypto::hash8&)ecdhInfo[i].amount;
FIELD(amount);
else // saving
memcpy(trunc_amount.data, ecdhInfo[i].amount.bytes, sizeof(trunc_amount));
FIELD(trunc_amount);
if (!typename Archive<W>::is_saving()) // loading
memcpy(ecdhInfo[i].amount.bytes, trunc_amount.data, sizeof(trunc_amount));
ar.end_object();
}
else
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