From c9aaf341aeaf82fcbb5926c2f6477e6b0455fac9 Mon Sep 17 00:00:00 2001
From: Duke Leto <duke@leto.net>
Date: Sun, 20 Feb 2022 23:20:15 -0500
Subject: [PATCH] Use randomxInput = blake2b(randomXkey || ac_name)

---
 src/miner.cpp | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/src/miner.cpp b/src/miner.cpp
index f1920f7c5..3b0335a2b 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -1134,7 +1134,7 @@ void static RandomXMiner()
                 hashTarget = HASHTarget;
 
                 char randomxHash[RANDOMX_HASH_SIZE];
-                // TODO: decide on real RandomX key and input
+                // Initial randomx key is chain magic + first letter of chain name which is 2^40 bits of entropy
                 char randomxKey[5];
                 randomxKey[0] = ASSETCHAINS_MAGIC & 0xff;
                 randomxKey[1] = (ASSETCHAINS_MAGIC >> 8) & 0xff;
@@ -1142,19 +1142,18 @@ void static RandomXMiner()
                 randomxKey[3] = (ASSETCHAINS_MAGIC >> 24) & 0xff;
                 randomxKey[4] = SMART_CHAIN_SYMBOL[0];
 
-                // crypto_generichash_blake2b_state state;
-                // CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
-                // ss << randomxKey;
-                // ss << SMART_CHAIN_SYMBOL;
-                // crypto_generichash_blake2b_update(&state, (unsigned char*)&ss[0], ss.size());
-                // char blakehash[32];
-                // crypto_generichash_blake2b_final(&state, blakehash, 32);
+                crypto_generichash_blake2b_state state;
+                // Hash = blake2b( key || ac_name)
+                crypto_generichash_blake2b_update(&state, (unsigned char*)&randomxKey[0], 5);
+                crypto_generichash_blake2b_update(&state, (unsigned char*)&SMART_CHAIN_SYMBOL[0], strlen(SMART_CHAIN_SYMBOL));
+                uchar randomxInput[32];
+                crypto_generichash_blake2b_final(&state, randomxInput, 32);
 
-                const char randomxInput[]   = "testing"; // blakehash[32];
                 randomx_flags flags         = randomx_get_flags();
                 randomx_cache *randomxCache = randomx_alloc_cache(flags);
 
-                if(Mining_height > 1) {
+                if(Mining_height > 1024 && (Mining_height % 1024 == 64)) {
+                    // At block height 1024*N+64 we should use the blockhash of block 1024*N as key
                     // use blockchain data to set a new key+input for a group of blocks
                     // randomxKey = ...
                     // randomxInput = ...