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aere-node/patches/0001-aere-pqc-precompiles-mainnet.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aere Network <node@aere.network>
Date: Thu, 10 Sep 2026 21:47:55 +0300
Subject: [PATCH] Aere Network: post-quantum signature verification precompiles
Regenerated 2026-09-10 from the production tree (overlay applied) over the same file set.
diff --git a/datatypes/src/main/java/org/hyperledger/besu/datatypes/Address.java b/datatypes/src/main/java/org/hyperledger/besu/datatypes/Address.java
index 950cd59e3..0f486dfcf 100644
--- a/datatypes/src/main/java/org/hyperledger/besu/datatypes/Address.java
+++ b/datatypes/src/main/java/org/hyperledger/besu/datatypes/Address.java
@@ -91,6 +91,21 @@ public class Address extends BytesHolder {
/** Precompile address for P256_VERIFY. */
public static final Address P256_VERIFY = Address.precompiled(0x0100);
+ /** AERE PQC precompile: Falcon-512 verify. */
+ public static final Address AERE_FALCON512 = Address.fromHexString("0x0000000000000000000000000000000000000ae1");
+
+ /** AERE PQC precompile: Falcon-1024 verify. */
+ public static final Address AERE_FALCON1024 = Address.fromHexString("0x0000000000000000000000000000000000000ae2");
+
+ /** AERE PQC precompile: ML-DSA-44 (FIPS 204) verify. */
+ public static final Address AERE_MLDSA44 = Address.fromHexString("0x0000000000000000000000000000000000000ae3");
+
+ /** AERE PQC precompile: SLH-DSA-SHA2-128s (FIPS 205) verify. */
+ public static final Address AERE_SLHDSA128S = Address.fromHexString("0x0000000000000000000000000000000000000ae4");
+
+ /** AERE PQC precompile: SHAKE256 XOF (FIPS 202). */
+ public static final Address AERE_SHAKE256 = Address.fromHexString("0x0000000000000000000000000000000000000ae5");
+
/** The constant ZERO. */
public static final Address ZERO = Address.fromHexString("0x0");
diff --git a/evm/src/main/java/org/hyperledger/besu/evm/precompile/AereFalconSupport.java b/evm/src/main/java/org/hyperledger/besu/evm/precompile/AereFalconSupport.java
new file mode 100644
index 000000000..1dbb2b85c
--- /dev/null
+++ b/evm/src/main/java/org/hyperledger/besu/evm/precompile/AereFalconSupport.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright contributors to the AERE Network.
+ *
+ * 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.evm.precompile;
+
+import java.util.Arrays;
+
+import org.apache.tuweni.bytes.Bytes;
+import org.apache.tuweni.bytes.Bytes32;
+import org.bouncycastle.pqc.crypto.falcon.FalconParameters;
+import org.bouncycastle.pqc.crypto.falcon.FalconPublicKeyParameters;
+import org.bouncycastle.pqc.crypto.falcon.FalconSigner;
+
+/**
+ * Shared logic for the AERE Falcon-512 / Falcon-1024 verification precompiles.
+ *
+ * <p>Transcodes the NIST round-3 reference "signed message" (sm) blob into the encoding Bouncy
+ * Castle's {@link FalconSigner#verifySignature(byte[], byte[])} expects and drives the audited
+ * verifier. No cryptography is reimplemented here.
+ *
+ * <p>NIST sm layout: {@code sigLen(2, big-endian) || nonce(40) || message || esig} where
+ * {@code esig = (0x20+logn) || compressedSig} and {@code sigLen == esig.length}. The Falcon public
+ * key is {@code (0x00+logn) || packed_h}; Bouncy Castle wants only {@code packed_h} (header
+ * stripped), and the signature it wants is {@code (0x30+logn) || nonce(40) || compressedSig}.
+ */
+final class AereFalconSupport {
+
+ static final int NONCE_LEN = 40;
+
+ private AereFalconSupport() {}
+
+ static Bytes resultWord(final boolean valid) {
+ return valid ? Bytes32.leftPad(Bytes.of((byte) 1)) : Bytes32.ZERO;
+ }
+
+ /**
+ * Verify a NIST signed-message blob against a Falcon public key.
+ *
+ * @param params Bouncy Castle Falcon parameter set (falcon_512 / falcon_1024)
+ * @param logn 9 for Falcon-512, 10 for Falcon-1024
+ * @param pkFull the 897- (512) or 1793-byte (1024) public key including the leading header byte
+ * @param sm the NIST signed-message blob
+ * @return true iff the signature is valid for the embedded message under pkFull
+ */
+ static boolean verify(
+ final FalconParameters params, final int logn, final byte[] pkFull, final byte[] sm) {
+ try {
+ if (pkFull.length < 2 || sm.length < 2 + NONCE_LEN + 2) {
+ return false;
+ }
+ if ((pkFull[0] & 0xff) != logn) {
+ return false;
+ }
+ final int sigLen = ((sm[0] & 0xff) << 8) | (sm[1] & 0xff);
+ if (sigLen < 2 || 2 + NONCE_LEN + sigLen > sm.length) {
+ return false;
+ }
+ final int msgLen = sm.length - 2 - NONCE_LEN - sigLen;
+ if (msgLen < 0) {
+ return false;
+ }
+ final byte[] esig = Arrays.copyOfRange(sm, sm.length - sigLen, sm.length);
+ if ((esig[0] & 0xff) != (0x20 + logn)) {
+ return false;
+ }
+ final byte[] H = Arrays.copyOfRange(pkFull, 1, pkFull.length);
+ final byte[] nonce = Arrays.copyOfRange(sm, 2, 2 + NONCE_LEN);
+ final byte[] message = Arrays.copyOfRange(sm, 2 + NONCE_LEN, 2 + NONCE_LEN + msgLen);
+
+ final byte[] bcSig = new byte[1 + NONCE_LEN + (esig.length - 1)];
+ bcSig[0] = (byte) (0x30 + logn);
+ System.arraycopy(nonce, 0, bcSig, 1, NONCE_LEN);
+ System.arraycopy(esig, 1, bcSig, 1 + NONCE_LEN, esig.length - 1);
+
+ final FalconPublicKeyParameters pub = new FalconPublicKeyParameters(params, H);
+ final FalconSigner signer = new FalconSigner();
+ signer.init(false, pub);
+ return signer.verifySignature(message, bcSig);
+ } catch (final Throwable t) {
+ return false;
+ }
+ }
+}
diff --git a/evm/src/main/java/org/hyperledger/besu/evm/precompile/Falcon1024PrecompiledContract.java b/evm/src/main/java/org/hyperledger/besu/evm/precompile/Falcon1024PrecompiledContract.java
new file mode 100644
index 000000000..80aca574d
--- /dev/null
+++ b/evm/src/main/java/org/hyperledger/besu/evm/precompile/Falcon1024PrecompiledContract.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright contributors to the AERE Network.
+ *
+ * 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.evm.precompile;
+
+import org.hyperledger.besu.evm.frame.MessageFrame;
+import org.hyperledger.besu.evm.gascalculator.GasCalculator;
+
+import jakarta.validation.constraints.NotNull;
+import org.apache.tuweni.bytes.Bytes;
+import org.bouncycastle.pqc.crypto.falcon.FalconParameters;
+
+/**
+ * AERE PQC precompile: Falcon-1024 signature verification (NIST round-3 reference encoding).
+ *
+ * <p>Input: {@code pk(1793) || sm(rest)} where pk is the reference public key (header 0x0A) and sm
+ * is the reference signed-message blob. Output: 32-byte word, {@code ...01} valid else {@code ...00}.
+ */
+public class Falcon1024PrecompiledContract extends AbstractPrecompiledContract {
+
+ static final int PK_LEN = 1793;
+ private static final int LOGN = 10;
+ private static final long GAS = 75_000L;
+
+ /**
+ * Instantiates a new Falcon-1024 precompiled contract.
+ *
+ * @param gasCalculator the gas calculator
+ */
+ Falcon1024PrecompiledContract(final GasCalculator gasCalculator) {
+ super("AereFalcon1024", gasCalculator);
+ }
+
+ @Override
+ public long gasRequirement(final Bytes input) {
+ return GAS;
+ }
+
+ @NotNull
+ @Override
+ public PrecompileContractResult computePrecompile(
+ final Bytes input, @NotNull final MessageFrame messageFrame) {
+ boolean valid = false;
+ if (input.size() > PK_LEN) {
+ final byte[] pk = input.slice(0, PK_LEN).toArrayUnsafe();
+ final byte[] sm = input.slice(PK_LEN).toArrayUnsafe();
+ valid = AereFalconSupport.verify(FalconParameters.falcon_1024, LOGN, pk, sm);
+ }
+ return PrecompileContractResult.success(AereFalconSupport.resultWord(valid));
+ }
+}
diff --git a/evm/src/main/java/org/hyperledger/besu/evm/precompile/Falcon512PrecompiledContract.java b/evm/src/main/java/org/hyperledger/besu/evm/precompile/Falcon512PrecompiledContract.java
new file mode 100644
index 000000000..5df074ceb
--- /dev/null
+++ b/evm/src/main/java/org/hyperledger/besu/evm/precompile/Falcon512PrecompiledContract.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright contributors to the AERE Network.
+ *
+ * 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.evm.precompile;
+
+import org.hyperledger.besu.evm.frame.MessageFrame;
+import org.hyperledger.besu.evm.gascalculator.GasCalculator;
+
+import jakarta.validation.constraints.NotNull;
+import org.apache.tuweni.bytes.Bytes;
+import org.bouncycastle.pqc.crypto.falcon.FalconParameters;
+
+/**
+ * AERE PQC precompile: Falcon-512 signature verification (NIST round-3 reference encoding).
+ *
+ * <p>Input: {@code pk(897) || sm(rest)} where pk is the reference public key (header 0x09) and sm is
+ * the reference signed-message blob. Output: 32-byte word, {@code ...01} if valid else {@code ...00}.
+ */
+public class Falcon512PrecompiledContract extends AbstractPrecompiledContract {
+
+ static final int PK_LEN = 897;
+ private static final int LOGN = 9;
+ private static final long GAS = 40_000L;
+
+ /**
+ * Instantiates a new Falcon-512 precompiled contract.
+ *
+ * @param gasCalculator the gas calculator
+ */
+ Falcon512PrecompiledContract(final GasCalculator gasCalculator) {
+ super("AereFalcon512", gasCalculator);
+ }
+
+ @Override
+ public long gasRequirement(final Bytes input) {
+ return GAS;
+ }
+
+ @NotNull
+ @Override
+ public PrecompileContractResult computePrecompile(
+ final Bytes input, @NotNull final MessageFrame messageFrame) {
+ boolean valid = false;
+ if (input.size() > PK_LEN) {
+ final byte[] pk = input.slice(0, PK_LEN).toArrayUnsafe();
+ final byte[] sm = input.slice(PK_LEN).toArrayUnsafe();
+ valid = AereFalconSupport.verify(FalconParameters.falcon_512, LOGN, pk, sm);
+ }
+ return PrecompileContractResult.success(AereFalconSupport.resultWord(valid));
+ }
+}
diff --git a/evm/src/main/java/org/hyperledger/besu/evm/precompile/MLDSA44PrecompiledContract.java b/evm/src/main/java/org/hyperledger/besu/evm/precompile/MLDSA44PrecompiledContract.java
new file mode 100644
index 000000000..f25be641f
--- /dev/null
+++ b/evm/src/main/java/org/hyperledger/besu/evm/precompile/MLDSA44PrecompiledContract.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright contributors to the AERE Network.
+ *
+ * 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.evm.precompile;
+
+import org.hyperledger.besu.evm.frame.MessageFrame;
+import org.hyperledger.besu.evm.gascalculator.GasCalculator;
+
+import jakarta.validation.constraints.NotNull;
+import org.apache.tuweni.bytes.Bytes;
+import org.apache.tuweni.bytes.Bytes32;
+import org.bouncycastle.pqc.crypto.mldsa.MLDSAParameters;
+import org.bouncycastle.pqc.crypto.mldsa.MLDSAPublicKeyParameters;
+import org.bouncycastle.pqc.crypto.mldsa.MLDSASigner;
+
+/**
+ * AERE PQC precompile: ML-DSA-44 (FIPS 204) signature verification via the INTERNAL interface
+ * (ML-DSA.Verify_internal, Algorithm 8 — no context/domain-separation prefix).
+ *
+ * <p>Input: {@code pk(1312) || sig(2420) || message(rest)}. Output: 32-byte word, {@code ...01}
+ * valid else {@code ...00}. The internal (rather than pure) verifier is reached by subclassing
+ * Bouncy Castle's {@link MLDSASigner} and calling its {@code protected internalVerifySignature}.
+ */
+public class MLDSA44PrecompiledContract extends AbstractPrecompiledContract {
+
+ static final int PK_LEN = 1312;
+ static final int SIG_LEN = 2420;
+ private static final long GAS = 55_000L;
+
+ /** Subclass exposing Bouncy Castle's protected internal (Verify_internal) verifier. */
+ private static final class InternalVerifier extends MLDSASigner {
+ boolean verifyInternal(final byte[] message, final byte[] signature) {
+ return internalVerifySignature(message, signature);
+ }
+ }
+
+ /**
+ * Instantiates a new ML-DSA-44 precompiled contract.
+ *
+ * @param gasCalculator the gas calculator
+ */
+ MLDSA44PrecompiledContract(final GasCalculator gasCalculator) {
+ super("AereMLDSA44", gasCalculator);
+ }
+
+ @Override
+ public long gasRequirement(final Bytes input) {
+ return GAS;
+ }
+
+ @NotNull
+ @Override
+ public PrecompileContractResult computePrecompile(
+ final Bytes input, @NotNull final MessageFrame messageFrame) {
+ boolean valid = false;
+ if (input.size() >= PK_LEN + SIG_LEN) {
+ try {
+ final byte[] pk = input.slice(0, PK_LEN).toArrayUnsafe();
+ final byte[] sig = input.slice(PK_LEN, SIG_LEN).toArrayUnsafe();
+ final byte[] message = input.slice(PK_LEN + SIG_LEN).toArrayUnsafe();
+ final MLDSAPublicKeyParameters pub =
+ new MLDSAPublicKeyParameters(MLDSAParameters.ml_dsa_44, pk);
+ final InternalVerifier verifier = new InternalVerifier();
+ verifier.init(false, pub);
+ valid = verifier.verifyInternal(message, sig);
+ } catch (final Throwable t) {
+ valid = false;
+ }
+ }
+ return PrecompileContractResult.success(
+ valid ? Bytes32.leftPad(Bytes.of((byte) 1)) : Bytes32.ZERO);
+ }
+}
diff --git a/evm/src/main/java/org/hyperledger/besu/evm/precompile/MainnetPrecompiledContracts.java b/evm/src/main/java/org/hyperledger/besu/evm/precompile/MainnetPrecompiledContracts.java
index 28d84abf1..43d9fb73a 100644
--- a/evm/src/main/java/org/hyperledger/besu/evm/precompile/MainnetPrecompiledContracts.java
+++ b/evm/src/main/java/org/hyperledger/besu/evm/precompile/MainnetPrecompiledContracts.java
@@ -226,6 +226,15 @@ public interface MainnetPrecompiledContracts {
*/
static void populateForFutureEIPs(
final PrecompileContractRegistry registry, final GasCalculator gasCalculator) {
- populateForCancun(registry, gasCalculator);
+ // AERE "AerePQC" fork: full Osaka precompile set plus native post-quantum verifiers.
+ // Activated on a running chain via genesis config "futureEipsTime"; no re-genesis needed.
+ populateForOsaka(registry, gasCalculator);
+
+ // Native post-quantum precompiles (audited Bouncy Castle BCPQC verifiers).
+ registry.put(Address.AERE_FALCON512, new Falcon512PrecompiledContract(gasCalculator));
+ registry.put(Address.AERE_FALCON1024, new Falcon1024PrecompiledContract(gasCalculator));
+ registry.put(Address.AERE_MLDSA44, new MLDSA44PrecompiledContract(gasCalculator));
+ registry.put(Address.AERE_SLHDSA128S, new SLHDSA128sPrecompiledContract(gasCalculator));
+ registry.put(Address.AERE_SHAKE256, new SHAKE256PrecompiledContract(gasCalculator));
}
}
diff --git a/evm/src/main/java/org/hyperledger/besu/evm/precompile/SHAKE256PrecompiledContract.java b/evm/src/main/java/org/hyperledger/besu/evm/precompile/SHAKE256PrecompiledContract.java
new file mode 100644
index 000000000..0c20e6a66
--- /dev/null
+++ b/evm/src/main/java/org/hyperledger/besu/evm/precompile/SHAKE256PrecompiledContract.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright contributors to the AERE Network.
+ *
+ * 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.evm.precompile;
+
+import org.hyperledger.besu.evm.frame.MessageFrame;
+import org.hyperledger.besu.evm.gascalculator.GasCalculator;
+
+import jakarta.validation.constraints.NotNull;
+import org.apache.tuweni.bytes.Bytes;
+import org.bouncycastle.crypto.digests.SHAKEDigest;
+
+/**
+ * AERE PQC precompile: SHAKE256 extendable-output function (FIPS 202).
+ *
+ * <p>Input layout: outLen (32 bytes, big-endian, capped at MAX_OUTPUT) || data (arbitrary length).
+ * Output: exactly {@code outLen} bytes of SHAKE256(data).
+ *
+ * <p>SHAKE256 is the hashing bottleneck inside Falcon, ML-DSA and SLH-DSA; exposing it natively lets
+ * on-chain PQC flows offload the hot path to audited Bouncy Castle rather than hand-rolled Solidity.
+ */
+public class SHAKE256PrecompiledContract extends AbstractPrecompiledContract {
+
+ /** Upper bound on requested output length to keep gas/allocation bounded. */
+ static final int MAX_OUTPUT = 1 << 16; // 65536 bytes
+
+ private static final int BASE_GAS = 60;
+ private static final int GAS_PER_WORD = 12;
+
+ /**
+ * Instantiates a new SHAKE256 precompiled contract.
+ *
+ * @param gasCalculator the gas calculator
+ */
+ SHAKE256PrecompiledContract(final GasCalculator gasCalculator) {
+ super("AereSHAKE256", gasCalculator);
+ }
+
+ private static int outputLength(final Bytes input) {
+ if (input.size() < 32) {
+ return 0;
+ }
+ // Big-endian 32-byte length; only the low 4 bytes are honoured, then capped.
+ long v = input.slice(28, 4).toLong() & 0xFFFFFFFFL;
+ // If any of the high 28 bytes are non-zero the value is enormous; cap regardless.
+ if (!input.slice(0, 28).isZero()) {
+ return MAX_OUTPUT;
+ }
+ if (v > MAX_OUTPUT) {
+ return MAX_OUTPUT;
+ }
+ return (int) v;
+ }
+
+ @Override
+ public long gasRequirement(final Bytes input) {
+ int outLen = outputLength(input);
+ int dataLen = input.size() < 32 ? 0 : input.size() - 32;
+ long words = ((long) dataLen + 31) / 32 + ((long) outLen + 31) / 32;
+ return BASE_GAS + GAS_PER_WORD * words;
+ }
+
+ @NotNull
+ @Override
+ public PrecompileContractResult computePrecompile(
+ final Bytes input, @NotNull final MessageFrame messageFrame) {
+ if (input.size() < 32) {
+ return PrecompileContractResult.success(Bytes.EMPTY);
+ }
+ final int outLen = outputLength(input);
+ final byte[] data = input.slice(32).toArrayUnsafe();
+ final SHAKEDigest digest = new SHAKEDigest(256);
+ if (data.length > 0) {
+ digest.update(data, 0, data.length);
+ }
+ final byte[] out = new byte[outLen];
+ if (outLen > 0) {
+ digest.doFinal(out, 0, outLen);
+ }
+ return PrecompileContractResult.success(Bytes.wrap(out));
+ }
+}
diff --git a/evm/src/main/java/org/hyperledger/besu/evm/precompile/SLHDSA128sPrecompiledContract.java b/evm/src/main/java/org/hyperledger/besu/evm/precompile/SLHDSA128sPrecompiledContract.java
new file mode 100644
index 000000000..2666602f4
--- /dev/null
+++ b/evm/src/main/java/org/hyperledger/besu/evm/precompile/SLHDSA128sPrecompiledContract.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright contributors to the AERE Network.
+ *
+ * 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.evm.precompile;
+
+import org.hyperledger.besu.evm.frame.MessageFrame;
+import org.hyperledger.besu.evm.gascalculator.GasCalculator;
+
+import jakarta.validation.constraints.NotNull;
+import org.apache.tuweni.bytes.Bytes;
+import org.apache.tuweni.bytes.Bytes32;
+import org.bouncycastle.pqc.crypto.slhdsa.SLHDSAParameters;
+import org.bouncycastle.pqc.crypto.slhdsa.SLHDSAPublicKeyParameters;
+import org.bouncycastle.pqc.crypto.slhdsa.SLHDSASigner;
+
+/**
+ * AERE PQC precompile: SLH-DSA-SHA2-128s (SPHINCS+, FIPS 205) signature verification via the
+ * INTERNAL interface (slh_verify_internal, Algorithm 20 — message hashed directly, no prefix).
+ *
+ * <p>Input: {@code pk(32) || sig(7856) || message(rest)}. Output: 32-byte word, {@code ...01} valid
+ * else {@code ...00}. The internal verifier is reached by subclassing Bouncy Castle's
+ * {@link SLHDSASigner} and calling its {@code protected internalVerifySignature}.
+ */
+public class SLHDSA128sPrecompiledContract extends AbstractPrecompiledContract {
+
+ static final int PK_LEN = 32;
+ static final int SIG_LEN = 7856;
+ private static final long GAS = 350_000L;
+
+ /** Subclass exposing Bouncy Castle's protected internal (slh_verify_internal) verifier. */
+ private static final class InternalVerifier extends SLHDSASigner {
+ boolean verifyInternal(final byte[] message, final byte[] signature) {
+ return internalVerifySignature(message, signature);
+ }
+ }
+
+ /**
+ * Instantiates a new SLH-DSA-128s precompiled contract.
+ *
+ * @param gasCalculator the gas calculator
+ */
+ SLHDSA128sPrecompiledContract(final GasCalculator gasCalculator) {
+ super("AereSLHDSA128s", gasCalculator);
+ }
+
+ @Override
+ public long gasRequirement(final Bytes input) {
+ return GAS;
+ }
+
+ @NotNull
+ @Override
+ public PrecompileContractResult computePrecompile(
+ final Bytes input, @NotNull final MessageFrame messageFrame) {
+ boolean valid = false;
+ if (input.size() >= PK_LEN + SIG_LEN) {
+ try {
+ final byte[] pk = input.slice(0, PK_LEN).toArrayUnsafe();
+ final byte[] sig = input.slice(PK_LEN, SIG_LEN).toArrayUnsafe();
+ final byte[] message = input.slice(PK_LEN + SIG_LEN).toArrayUnsafe();
+ final SLHDSAPublicKeyParameters pub =
+ new SLHDSAPublicKeyParameters(SLHDSAParameters.sha2_128s, pk);
+ final InternalVerifier verifier = new InternalVerifier();
+ verifier.init(false, pub);
+ valid = verifier.verifyInternal(message, sig);
+ } catch (final Throwable t) {
+ valid = false;
+ }
+ }
+ return PrecompileContractResult.success(
+ valid ? Bytes32.leftPad(Bytes.of((byte) 1)) : Bytes32.ZERO);
+ }
+}
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