feat(keccak256-opcode): Add KECCAK256 opcode

Pending: calculate dynamic gas
lambdaclass · Apr 10, 2024 · 1b9d961 · 1b9d961
1 parent 6eb9ced
commit 1b9d961
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/system-contracts/contracts/EvmInterpreter.yul b/system-contracts/contracts/EvmInterpreter.yul
@@ -337,6 +337,21 @@ object "EVMInterpreter" {
 
                     sp := pushStackItem(sp, mulmod(a, b, N))
                 }
+                case 0x20 { // OP_KECCAK256
+                    let offset, size
+
+                    offset, sp := popStackItem(sp)
+                    size, sp := popStackItem(sp)
+
+                    sp := pushStackItem(sp, keccak256(add(MEM_OFFSET(), offset), size))
+
+                    // TODO: Handle dynamicGas for gas costs.
+                    // dynamic_gas = 6 * minimum_word_size + memory_expansion_cost
+                    let dynamicGas = 0
+                    let staticGas = 30
+                    let usedGas = add(staticGas, dynamicGas)
+                    evmGasLeft := chargeGas(evmGasLeft, usedGas)
+                }
                 case 0x55 { // OP_SSTORE
                     let key, value