cryptonote_basic: add overload for get_block_longhash()

Author: jeffro256

src/cryptonote_basic/cryptonote_format_utils.cpp

@@ -1605,6 +1605,31 @@ namespace cryptonote
     return get_tx_tree_hash(txs_ids);
   }
   //---------------------------------------------------------------
+  crypto::hash get_block_longhash(const blobdata_ref block_hashing_blob,
+    const uint64_t height,
+    const uint8_t major_version,
+    const crypto::hash &seed_hash)
+  {
+    crypto::hash res;
+
+    if (height == 202612) // block 202612 bug workaround
+    {
+      static const std::string longhash_202612 = "84f64766475d51837ac9efbef1926486e58563c95a19fef4aec3254f03000000";
+      epee::string_tools::hex_to_pod(longhash_202612, res);
+    }
+    else if (major_version >= RX_BLOCK_VERSION) // RandomX
+    {
+      crypto::rx_slow_hash(seed_hash.data, block_hashing_blob.data(), block_hashing_blob.size(), res.data);
+    }
+    else // CryptoNight
+    {
+      const int pow_variant = major_version >= 7 ? major_version - 6 : 0;
+      crypto::cn_slow_hash(block_hashing_blob.data(), block_hashing_blob.size(), res, pow_variant, height);
+    }
+
+    return res;
+  }
+  //---------------------------------------------------------------
   bool is_valid_decomposed_amount(uint64_t amount)
   {
     if (0 == amount)

src/cryptonote_basic/cryptonote_format_utils.h

@@ -261,6 +261,10 @@ namespace cryptonote
   void get_tx_tree_hash(const std::vector<crypto::hash>& tx_hashes, crypto::hash& h);
   crypto::hash get_tx_tree_hash(const std::vector<crypto::hash>& tx_hashes);
   crypto::hash get_tx_tree_hash(const block& b);
+  crypto::hash get_block_longhash(const blobdata_ref block_hashing_blob,
+    const uint64_t height,
+    const uint8_t major_version,
+    const crypto::hash &seed_hash);
   bool is_valid_decomposed_amount(uint64_t amount);
   void get_hash_stats(uint64_t &tx_hashes_calculated, uint64_t &tx_hashes_cached, uint64_t &block_hashes_calculated, uint64_t & block_hashes_cached);
 

src/cryptonote_core/cryptonote_tx_utils.cpp

@@ -679,29 +679,13 @@ namespace cryptonote
 
   bool get_block_longhash(const Blockchain *pbc, const blobdata& bd, crypto::hash& res, const uint64_t height, const int major_version, const crypto::hash *seed_hash, const int miners)
   {
-    // block 202612 bug workaround
-    if (height == 202612)
+    crypto::hash seed_hash_ = crypto::null_hash;
+    if (pbc != NULL && major_version >= RX_BLOCK_VERSION)
     {
-      static const std::string longhash_202612 = "84f64766475d51837ac9efbef1926486e58563c95a19fef4aec3254f03000000";
-      epee::string_tools::hex_to_pod(longhash_202612, res);
-      return true;
-    }
-    if (major_version >= RX_BLOCK_VERSION)
-    {
-      crypto::hash hash;
-      if (pbc != NULL)
-      {
-        const uint64_t seed_height = rx_seedheight(height);
-        hash = seed_hash ? *seed_hash : pbc->get_pending_block_id_by_height(seed_height);
-      } else
-      {
-        memset(&hash, 0, sizeof(hash));  // only happens when generating genesis block
-      }
-      rx_slow_hash(hash.data, bd.data(), bd.size(), res.data);
-    } else {
-      const int pow_variant = major_version >= 7 ? major_version - 6 : 0;
-      crypto::cn_slow_hash(bd.data(), bd.size(), res, pow_variant, height);
+      const uint64_t seed_height = rx_seedheight(height);
+      seed_hash_ = seed_hash ? *seed_hash : pbc->get_pending_block_id_by_height(seed_height);
     }
+    res = get_block_longhash(bd, height, major_version, seed_hash_);
     return true;
   }