Make our initial randomx key longer, at least 9 bytes of entropy

src/miner.cpp

@@ -1167,9 +1167,10 @@ void static RandomXMiner()
             gotinvalid = 0;
             while (true)
             {
-                fprintf(stderr,"RandomXMiner: gotinvalid=%d\n",gotinvalid);
-                if ( gotinvalid != 0 )
+                if ( gotinvalid != 0 ) {
+                    fprintf(stderr,"RandomXMiner: gotinvalid=%d\n",gotinvalid);
                     break;
+                }
                 hush_longestchain();
 
                 fprintf(stderr,"RandomXMiner: solving with nNonce = %s\n",pblock->nNonce.ToString().c_str());
@@ -1177,16 +1178,16 @@ void static RandomXMiner()
                 hashTarget = HASHTarget;
 
                 char randomxHash[RANDOMX_HASH_SIZE];
-                fprintf(stderr,"RandomXMiner: created randomxHash of size %d\n", RANDOMX_HASH_SIZE);
-                // Initial randomx key is ac_name which is >= 2^40 bits of entropy assuming strlen(ac_name) >= 5
-                // For ac_name=DRAGONX we have 7 bytes or 2^56 bits of entropy
-                char randomxKey[65]; // randomx spec says keysize of >60 bytes is implementation-specific
-                strncpy(randomxKey, SMART_CHAIN_SYMBOL, 65);
+                //fprintf(stderr,"RandomXMiner: created randomxHash of size %d\n", RANDOMX_HASH_SIZE);
+                char randomxKey[82]; // randomx spec says keysize of >60 bytes is implementation-specific
+                // initial randomx key is unique to every Hush Smart Chain, and has at least 9 bytes (2^128 bits) of entropy
+                // since magic is 4 bytes, rpc port is 4 bytes and smart chain symbol must be at least 1 character long
+                snprintf(randomxKey, 81, "%08x%s%08x", ASSETCHAINS_MAGIC, SMART_CHAIN_SYMBOL, ASSETCHAINS_RPCPORT);
 
                 char randomxInput[80];
                 sprintf(randomxInput, "%08x Extreme Privacy Hush Smart Chain %08x", ASSETCHAINS_MAGIC, ASSETCHAINS_MAGIC);
 
-                fprintf(stderr,"RandomXMiner: created randomxInput=%s\n", randomxInput);
+                fprintf(stderr,"RandomXMiner: created randomxKey=%s , randomxInput=%s\n", randomxKey, randomxInput);
 
                 randomx_flags flags         = randomx_get_flags();
                 randomx_cache *randomxCache = randomx_alloc_cache(flags);
@@ -1194,7 +1195,7 @@ void static RandomXMiner()
                     LogPrintf("RandomX cache is null, something is wrong, cannot mine!\n");
                     return;
                 }
-                fprintf(stderr,"RandomXMiner: created randomx flags + cache\n");
+                // fprintf(stderr,"RandomXMiner: created randomx flags + cache\n");
 
                 // With the defaults of 1024 and 64
                 // the key block will change every ~21.3 hours with a 75s block time

test_randomx

@@ -1,6 +1,6 @@
 #!/bin/bash
 
- ./src/hushd -ac_randomx_interval=10 -ac_randomx_lag=3 -ac_halving=20 -ac_algo=randomx -ac_name=RANDOMX6 -ac_private=1 -ac_blocktime=20 -ac_reward=500000000 -ac_supply=55555 -gen=1 -genproclimit=1 -testnode=1
+ ./src/hushd -ac_randomx_interval=10 -ac_randomx_lag=3 -ac_halving=20 -ac_algo=randomx -ac_name=RANDOMX8 -ac_private=1 -ac_blocktime=20 -ac_reward=500000000 -ac_supply=55555 -gen=1 -genproclimit=1 -testnode=1
 
 # to run via the debugger
 # type "run" when gdb prompt appears