Run-time randomly generated Sietch zdust addresses

This commit drastically improves the privacy of the HUSH anonymity set
under attacks which ingest wallet.dat's which have been obtained by
seizure, i.e. stealing someones HUSH wallet.dat and putting it into
chain analysis software. Ciphertrace is known to do this to ZEC and XMR
and we can assume all chain analysis companies are implementing new
ways to de-anonymize privacy coins with any data they can obtain.

Instead of randomly sending to a randomly chosen static address,
hushd Sietch zdust addresses are now randomly generated at run-time. These
addresses are not stored in wallet.dat in any way and their private keys
are not known except by the internal memory of hushd for a few milliseconds.
This data is not stored in long-lived data structures of hushd, only as long
as the RPC z_getnewaddress is running or the equivalent function for internals
code paths. The seeds or private keys of these addresses are never stored on disk.

This now brings hushd on par with SDL, which already does this via a
different but equivalent seed phrase technique.

With this technique, if a HUSH wallet.dat is seized, it's impossible to tell
if any of the shielded outputs are random Sietch zdust with random data payload
or a one-time-use zaddr with encrypted payload.

src/sietch.h

@@ -38,223 +38,11 @@ SendManyRecipient newSietchRecipient(string zaddr) {
     return SendManyRecipient( zaddr, nAmount, string(str) );
 }
 
-
-// The network essentially DoS's these addresses and reduces their privacy slightly
-// by making them public, but in return, the rest of the shielded pool benefits
-// and so it's a large benefit for a small cost.
 string randomSietchZaddr() {
-    std::vector<string> SietchShieldedPool1 = {
-  "zs1qqj4aw35ku9yn72g3tha588mxk66mhl5smnn99as40887xvdg49d4yqf43hhqnj9rpsq7qaqqhx",
-  "zs1qywzq2cutvg6rkynjljtssz246easagumg3hlwjluz4g7qttg9kqrld7s43ewutpph56jmn2zu6",
-  "zs1qx7swmw28dj992f6zs0aqucds9kag88mnca5u73dddeqek4m97pg7h9qsaxxwwkgqxht6zujaxc",
-  "zs1q82pkqu58uemrm2749x6g2ta5shnsra9p5jgk0qqzxd3e08ke6vyeezz7lhldj32jxtsuemskk7",
-  "zs1qvah5w05qq4yhrsqrt73ckgntkmwdv9mntxep8clnxqfph8xggqad96a5nvwg4evfr9pc5ruvc8",
-  "zs1qwrkjcmnrwrqqkz3dyfjvdvdppe0ndnm8fhhpsz8stje4qcfc54jtuygz2jfwc3aag69wsjcm8h",
-  "zs1q5pd7h4x7dtnpa4ace7tytye5sd0j4043t4f3jdntyxvg9ex258nu6pw9tthn6t5gmjq5gv0lhc",
-  "zs1q6vjrpsuf468an545q7fh9cx0xlkwh75a7qjpemjh3ymuqqzxz5ts2n2dcth3yfnlv6vqpjyglr",
-  "zs1qmsvwtxkwlh3tkh0lqtwqv2mxy94jt778f7j74a8067nejkt4j3m2rkmypccju7cfuw7xyg0gg8",
-  "zs1qu3jxrw5qwuvl7zfvnsdvywr4a9cn4h00me65te29platx5agek072f5rvxgt8kdt630qs4tgtr",
-  "zs1qamxwddwrl5xn56alffruk69p304cqf7uf5nhqpwfc374l9ph00m78xv2kzwymyz0fhxcku7v5k",
-  "zs1q7gv479e6q7d8fxc35v5s27em66mmm5gz50excudf95rzjgnwdy5pnwdfytvm7gt8kt6wpkfphq",
-  "zs1pqvxd9a2zcsh2v8gaswh3jp2qkzz5umrucl5k4gx0rkvmq68krpx3jesavxftd8t0z56v8whllj",
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-    };
-
-    std::vector<string> SietchShieldedPool2 = {
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-  "zs1lhkhftvpkvcuyhwgcz4gq9y9l3ly5esglk2g0sgdctrz2cd63lgss2gtn8eedsvtuh8f6shpwww",
-    };
-    //TODO: Assumes pools of 100
-    int randIndex = GetRandInt(100); // random int between 0 and 99
-    if(randIndex % 2) {
-       return SietchShieldedPool1[randIndex];
-    } else {
-       return SietchShieldedPool2[randIndex];
-    }
+    auto sk    = libzcash::SaplingSpendingKey::random();
+    auto expsk = sk.expanded_spending_key();
+    auto zdust = sk.default_address();
+    return EncodePaymentAddress(zdust);
 }
 
 #endif

src/wallet/rpcwallet.cpp

@@ -72,7 +72,7 @@ using namespace libzcash;
 extern char ASSETCHAINS_SYMBOL[KOMODO_ASSETCHAIN_MAXLEN];
 extern std::string ASSETCHAINS_OVERRIDE_PUBKEY;
 const std::string ADDR_TYPE_SAPLING = "sapling";
-const std::string ADDR_TYPE_DONOTREMEMBER = "donotremember";
+const std::string ADDR_TYPE_AMNESIA = "amnesia";
 extern UniValue TxJoinSplitToJSON(const CTransaction& tx);
 extern int32_t KOMODO_INSYNC;
 uint32_t komodo_segid32(char *coinaddr);
@@ -3895,16 +3895,16 @@ UniValue z_getnewaddress(const UniValue& params, bool fHelp, const CPubKey& mypk
         throw runtime_error(
             "z_getnewaddress ( type )\n"
             "\nReturns a new shielded address for receiving payments.\n"
-            "\nWith no arguments, returns a Sapling address.\n"
-            "\nBe very careful with 'donotremember' address type, the extended spending key (xsk) of that address is not stored in wallet.dat!\n"
+            "\nWith no arguments, returns a Sapling address (zaddr).\n"
+            "\nBe very careful with 'amnesia' address type, the address is not stored in wallet.dat and if you send funds to it THEY WILL BE LOST FOREVER\n"
             "\nArguments:\n"
-            "1. \"type\"         (string, optional, default=\"" + defaultType + "\") The type of address. Either "+ ADDR_TYPE_SAPLING + " or " + ADDR_TYPE_DONOTREMEMBER + " .\n"
+            "1. \"type\"         (string, optional, default=\"" + defaultType + "\") The type of address. Either "+ ADDR_TYPE_SAPLING + " or " + ADDR_TYPE_AMNESIA + " .\n"
             "\nResult:\n"
             "\"" + strprintf("%s",komodo_chainname()) + "_address\"    (string) The new shielded address.\n"
             "\nExamples:\n"
             + HelpExampleCli("z_getnewaddress", "")
             + HelpExampleCli("z_getnewaddress", ADDR_TYPE_SAPLING)
-            + HelpExampleCli("z_getnewaddress", ADDR_TYPE_DONOTREMEMBER)
+            + HelpExampleCli("z_getnewaddress", ADDR_TYPE_AMNESIA)
         );
 
     LOCK2(cs_main, pwalletMain->cs_wallet);
@@ -3917,15 +3917,14 @@ UniValue z_getnewaddress(const UniValue& params, bool fHelp, const CPubKey& mypk
     }
     if (addrType == ADDR_TYPE_SAPLING) {
         return EncodePaymentAddress(pwalletMain->GenerateNewSaplingZKey());
-    } else if (addrType == ADDR_TYPE_DONOTREMEMBER) {
-        bool addToWallet = false;
-        auto zaddr = EncodePaymentAddress(pwalletMain->GenerateNewSaplingZKey(addToWallet));
+    } else if (addrType == ADDR_TYPE_AMNESIA) {
+        auto zaddr = randomSietchZaddr();
         if(fZdebug) {
-            fprintf(stderr,"%s: Sietch zaddr=%s created, xsk not stored in wallet.dat!\n", __FUNCTION__, zaddr.c_str() );
+            fprintf(stderr,"%s: Sietch zaddr=%s created, not stored in wallet.dat!\n", __FUNCTION__, zaddr.c_str() );
         }
         return zaddr;
     } else {
-        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid address type! Try " + ADDR_TYPE_SAPLING + " or " + ADDR_TYPE_DONOTREMEMBER);
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid address type! Try " + ADDR_TYPE_SAPLING + " or " + ADDR_TYPE_AMNESIA);
     }
 }
 
@@ -4758,8 +4757,8 @@ UniValue z_sendmany(const UniValue& params, bool fHelp, const CPubKey& mypk)
         int decider = 1 + GetRandInt(100); // random int between 1 and 100
         string zdust1, zdust2;
 
-        // Which zaddr we send to is non-deterministically chosen from two zpools...
-        zdust1 = fSietchDynamic ? newSietchZaddr() : randomSietchZaddr();
+        // Which zaddr we send to is randomly generated
+        zdust1 = randomSietchZaddr();
 
         // And their ordering when given to internals is also non-deterministic, which
         // helps breaks assumptions blockchain analysts may use from z_sendmany internals
@@ -4773,7 +4772,7 @@ UniValue z_sendmany(const UniValue& params, bool fHelp, const CPubKey& mypk)
 
         //50% chance of adding another zout
         if (decider % 2) {
-            zdust2 = fSietchDynamic ? newSietchZaddr() : randomSietchZaddr();
+            zdust2 = randomSietchZaddr();
             // 50% chance of adding it to the front or back since all odd numbers are 1 or 3 mod 4
             if(decider % 4 == 3) {
                 zaddrRecipients.push_back(  newSietchRecipient(zdust2)  );