/* * Copyright ConsenSys AG. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License. * * SPDX-License-Identifier: Apache-2.0 */ package org.hyperledger.besu.ethereum.mainnet.precompiles; import static java.util.Arrays.copyOfRange; import static org.hyperledger.besu.crypto.Blake2bfMessageDigest.Blake2bfDigest.MESSAGE_LENGTH_BYTES; import org.hyperledger.besu.crypto.Hash; import org.hyperledger.besu.ethereum.core.Gas; import org.hyperledger.besu.ethereum.mainnet.AbstractPrecompiledContract; import org.hyperledger.besu.ethereum.vm.GasCalculator; import org.hyperledger.besu.ethereum.vm.MessageFrame; import java.math.BigInteger; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import org.apache.tuweni.bytes.Bytes; // https://github.com/keep-network/go-ethereum/pull/4 public class BLAKE2BFPrecompileContract extends AbstractPrecompiledContract { private static final Logger LOG = LogManager.getLogger(); public BLAKE2BFPrecompileContract(final GasCalculator gasCalculator) { super("BLAKE2f", gasCalculator); } @Override public Gas gasRequirement(final Bytes input) { if (input.size() != MESSAGE_LENGTH_BYTES) { // Input is malformed, we can't read the number of rounds. // Precompile can't be executed so we set its price to 0. return Gas.ZERO; } if ((input.get(212) & 0xFE) != 0) { // Input is malformed, F value can be only 0 or 1 return Gas.ZERO; } final byte[] roundsBytes = copyOfRange(input.toArray(), 0, 4); final BigInteger rounds = new BigInteger(1, roundsBytes); return Gas.of(rounds); } @Override public Bytes compute(final Bytes input, final MessageFrame messageFrame) { if (input.size() != MESSAGE_LENGTH_BYTES) { LOG.trace( "Incorrect input length. Expected {} and got {}", MESSAGE_LENGTH_BYTES, input.size()); return null; } if ((input.get(212) & 0xFE) != 0) { LOG.trace("Incorrect finalization flag, expected 0 or 1 and got {}", input.get(212)); return null; } return Hash.blake2bf(input); } }