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Set a rolling randomx block key

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This commit is contained in:
Duke Leto
2022-03-09 10:18:06 -05:00
parent e4abb51fcd
commit 224b5b144c
1 changed files with 20 additions and 9 deletions
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29
src/miner.cpp
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@@ -1161,19 +1161,30 @@ void static RandomXMiner()
}
// TODO: use same block key for groups of blocks
if(Mining_height > 1024 && (Mining_height % 1024 == 64)) {
// At block height 1024*N+64 we should use the blockhash of block 1024*N as randomx key
// use blockchain data to set a new key+input for a group of blocks
uint256 randomxBlockKey;
randomxBlockKey = chainActive[Mining_height - 64]->GetBlockHash();
// TODO: we may want to tweak these params to more closely match the 2.8 days and ~2 hrs
// which is what they work out to on XMR
// The key block will change every ~21.3 hours with a 75s block time
// and every ~17 hours with the default 60s block time for HSCs
int randomxInterval = 1024;
// This lag is 80 mins for 75s blocktime and 64 mins for 60s (default) blocktime for HSCs
int randomxBlockLag = 64;
// Use the initial key at the start of the chain
if( (Mining_height-randomxBlockLag) < randomxInterval) {
LogPrintf("RandomX using initial key\n");
randomx_init_cache(randomxCache, &randomxKey, sizeof randomxKey);
} else {
// At heights between intervals, we use the same block key and wait randomxBlockLag blocks until changing
int keyHeight = ((Mining_height - randomxBlockLag) / randomxInterval) * randomxInterval;
LogPrintf("RandomX key height=%d\n", keyHeight);
uint256 randomxBlockKey = chainActive[keyHeight]->GetBlockHash();
crypto_generichash_blake2b_state new_state;
crypto_generichash_blake2b_update(&state, (unsigned char*)&randomxBlockKey, 32);
crypto_generichash_blake2b_update(&state, (unsigned char *)&randomxBlockKey, 32);
crypto_generichash_blake2b_final(&state, randomxInput, 32);
randomx_init_cache(randomxCache, &randomxBlockKey, sizeof randomxKey);
}
// TODO: use correct variables
randomx_init_cache(randomxCache, &randomxKey, sizeof randomxKey);
randomx_vm *myVM = randomx_create_vm(flags, randomxCache, NULL);
if(myVM == NULL) {
LogPrintf("Cannot create RandomX VM, aborting!\n");