perf: optimize bloom filter hashing

Author: ananas-block

Cargo.lock

@@ -12,7 +12,7 @@ pinocchio = ["dep:pinocchio"]
 
 [dependencies]
 bitvec = "1.0.1"
-fastmurmur3 = "0.2.0"
+solana-nostd-keccak = "0.1.3"
 num-bigint = { workspace = true }
 solana-program-error = { workspace = true, optional = true }
 pinocchio = { workspace = true, optional = true }

program-libs/bloom-filter/Cargo.toml

@@ -70,13 +70,18 @@ impl<'a> BloomFilter<'a> {
 
     pub fn probe_index_fast_murmur(value_bytes: &[u8], iteration: usize, capacity: &u64) -> usize {
         let iter_bytes = iteration.to_le_bytes();
-        let base_hash = fastmurmur3::hash(value_bytes);
-        let mut combined_bytes = [0u8; 24];
-        combined_bytes[..16].copy_from_slice(&base_hash.to_le_bytes());
-        combined_bytes[16..].copy_from_slice(&iter_bytes);
+        let mut combined_bytes = [0u8; 40];
+        combined_bytes[..32].copy_from_slice(value_bytes);
+        combined_bytes[32..].copy_from_slice(&iter_bytes);
 
-        let combined_hash = fastmurmur3::hash(&combined_bytes);
-        (combined_hash % (*capacity as u128)) as usize
+        let hash = solana_nostd_keccak::hash(&combined_bytes);
+
+        let mut index = 0;
+        for chunk in hash.chunks(8) {
+            let value = u64::from_le_bytes(chunk.try_into().unwrap());
+            index = (value + index) % *capacity;
+        }
+        index as usize
     }
 
     pub fn insert(&mut self, value: &[u8; 32]) -> Result<(), BloomFilterError> {

program-libs/bloom-filter/src/lib.rs

@@ -23,6 +23,7 @@ solana-program-error = { workspace = true, optional = true }
 solana-pubkey = { workspace = true, optional = true }
 pinocchio = { workspace = true, optional = true }
 borsh = { workspace = true }
+solana-nostd-keccak = "0.1.3"
 
 [target.'cfg(not(target_os = "solana"))'.dependencies]
 ark-bn254 = { workspace = true }

program-libs/hasher/Cargo.toml

@@ -14,31 +14,8 @@ impl Hasher for Keccak {
     }
 
     fn hashv(vals: &[&[u8]]) -> Result<Hash, HasherError> {
-        #[cfg(not(target_os = "solana"))]
-        {
-            use sha3::{Digest, Keccak256};
-
-            let mut hasher = Keccak256::default();
-            for val in vals {
-                hasher.update(val);
-            }
-            Ok(hasher.finalize().into())
-        }
-        // Call via a system call to perform the calculation
-        #[cfg(target_os = "solana")]
-        {
-            use crate::HASH_BYTES;
-
-            let mut hash_result = [0; HASH_BYTES];
-            unsafe {
-                crate::syscalls::sol_keccak256(
-                    vals as *const _ as *const u8,
-                    vals.len() as u64,
-                    &mut hash_result as *mut _ as *mut u8,
-                );
-            }
-            Ok(hash_result)
-        }
+        use solana_nostd_keccak;
+        Ok(solana_nostd_keccak::hashv(vals))
     }
 
     fn zero_bytes() -> ZeroBytes {