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Make the order of zaddr recipients we give to z_sendmany internals non-deterministic

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Duke Leto
2019-12-31 18:54:25 -05:00
parent 597171f2ee
commit 0c70df2854
1 changed files with 13 additions and 3 deletions
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16
src/wallet/rpcwallet.cpp
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@@ -4543,17 +4543,27 @@ UniValue z_sendmany(const UniValue& params, bool fHelp, const CPubKey& mypk)
string zdust1, zdust2;
// Which zaddr we send to is non-deterministically chosen...
// Which zaddr we send to is non-deterministically chosen from two zpools...
zdust1 = randomSietchZaddr();
zaddrRecipients.push_back( SendManyRecipient(zdust1, nAmount, memo) );
// And their ordering when given to internals is also non-deterministic, which
// helps breaks assumptions blockchain analysts may use from z_sendmany internals
if (decider % 2) {
zaddrRecipients.insert(std::begin(zaddrRecipients), SendManyRecipient(zdust1, nAmount, memo) );
} else {
zaddrRecipients.push_back( SendManyRecipient(zdust1, nAmount, memo) );
}
if(fZdebug)
fprintf(stderr,"%s: adding %s as zdust receiver\n", __FUNCTION__, zdust1.c_str());
//50% chance of adding another zout
if (decider % 2) {
zdust2 = randomSietchZaddr();
zaddrRecipients.push_back( SendManyRecipient(zdust2, nAmount, memo) );
if(decider % 4 == 3) {
zaddrRecipients.push_back( SendManyRecipient(zdust2, nAmount, memo) );
} else {
zaddrRecipients.insert(std::begin(zaddrRecipients), SendManyRecipient(zdust2, nAmount, memo) );
}
if(fZdebug)
fprintf(stderr,"%s: adding %s as zdust receiver\n", __FUNCTION__, zdust2.c_str());
}