48416dfe73
Aere Network public source. Everything here can be checked against the live chain (chain id 2800, https://rpc.aere.network). Scope note, stated up front rather than buried: consensus on chain 2800 is classical secp256k1 ECDSA QBFT. The post-quantum work in this repository is at the signature, precompile, account and transport layers. Nothing here makes the consensus post-quantum, and no document in it should be read as claiming so.
94 lines
3.3 KiB
Java
94 lines
3.3 KiB
Java
/*
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* Copyright contributors to the AERE Network.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
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* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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package org.hyperledger.besu.evm.precompile;
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import org.hyperledger.besu.evm.frame.MessageFrame;
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import org.hyperledger.besu.evm.gascalculator.GasCalculator;
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import jakarta.validation.constraints.NotNull;
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import org.apache.tuweni.bytes.Bytes;
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import org.bouncycastle.crypto.digests.SHAKEDigest;
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/**
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* AERE PQC precompile: SHAKE256 extendable-output function (FIPS 202).
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*
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* <p>Input layout: outLen (32 bytes, big-endian, capped at MAX_OUTPUT) || data (arbitrary length).
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* Output: exactly {@code outLen} bytes of SHAKE256(data).
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*
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* <p>SHAKE256 is the hashing bottleneck inside Falcon, ML-DSA and SLH-DSA; exposing it natively lets
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* on-chain PQC flows offload the hot path to audited Bouncy Castle rather than hand-rolled Solidity.
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*/
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public class SHAKE256PrecompiledContract extends AbstractPrecompiledContract {
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/** Upper bound on requested output length to keep gas/allocation bounded. */
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static final int MAX_OUTPUT = 1 << 16; // 65536 bytes
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private static final int BASE_GAS = 60;
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private static final int GAS_PER_WORD = 12;
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/**
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* Instantiates a new SHAKE256 precompiled contract.
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*
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* @param gasCalculator the gas calculator
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*/
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SHAKE256PrecompiledContract(final GasCalculator gasCalculator) {
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super("AereSHAKE256", gasCalculator);
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}
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private static int outputLength(final Bytes input) {
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if (input.size() < 32) {
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return 0;
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}
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// Big-endian 32-byte length; only the low 4 bytes are honoured, then capped.
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long v = input.slice(28, 4).toLong() & 0xFFFFFFFFL;
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// If any of the high 28 bytes are non-zero the value is enormous; cap regardless.
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if (!input.slice(0, 28).isZero()) {
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return MAX_OUTPUT;
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}
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if (v > MAX_OUTPUT) {
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return MAX_OUTPUT;
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}
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return (int) v;
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}
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@Override
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public long gasRequirement(final Bytes input) {
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int outLen = outputLength(input);
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int dataLen = input.size() < 32 ? 0 : input.size() - 32;
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long words = ((long) dataLen + 31) / 32 + ((long) outLen + 31) / 32;
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return BASE_GAS + GAS_PER_WORD * words;
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}
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@NotNull
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@Override
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public PrecompileContractResult computePrecompile(
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final Bytes input, @NotNull final MessageFrame messageFrame) {
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if (input.size() < 32) {
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return PrecompileContractResult.success(Bytes.EMPTY);
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}
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final int outLen = outputLength(input);
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final byte[] data = input.slice(32).toArrayUnsafe();
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final SHAKEDigest digest = new SHAKEDigest(256);
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if (data.length > 0) {
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digest.update(data, 0, data.length);
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}
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final byte[] out = new byte[outLen];
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if (outLen > 0) {
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digest.doFinal(out, 0, outLen);
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}
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return PrecompileContractResult.success(Bytes.wrap(out));
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}
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}
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