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/* * Copyright 2013 Google Inc. * Copyright 2014-2016 the libsecp256k1 contributors * * 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. */ package org.YinchengCoin; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.math.BigInteger; import com.google.common.base.Preconditions; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantReadWriteLock; import static org.YinchengCoin.NativeSecp256k1Util.*; /** * <p>This class holds native methods to handle ECDSA verification.</p> * * <p>You can find an example library that can be used for this at https://github.com/YinchengCoin/secp256k1</p> * * <p>To build secp256k1 for use with YinchengCoinj, run * `./configure --enable-jni --enable-experimental --enable-module-ecdh` * and `make` then copy `.libs/libsecp256k1.so` to your system library path * or point the JVM to the folder containing it with -Djava.library.path * </p> */ public class NativeSecp256k1 { private static final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); private static final Lock r = rwl.readLock(); private static final Lock w = rwl.writeLock(); private static ThreadLocal<ByteBuffer> nativeECDSABuffer = new ThreadLocal<ByteBuffer>(); /** * Verifies the given secp256k1 signature in native code. * Calling when enabled == false is undefined (probably library not loaded) * * @param data The data which was signed, must be exactly 32 bytes * @param signature The signature * @param pub The public key which did the signing */ public static boolean verify(byte[] data, byte[] signature, byte[] pub) throws AssertFailException{ Preconditions.checkArgument(data.length == 32 && signature.length <= 520 && pub.length <= 520); ByteBuffer byteBuff = nativeECDSABuffer.get(); if (byteBuff == null || byteBuff.capacity() < 520) { byteBuff = ByteBuffer.allocateDirect(520); byteBuff.order(ByteOrder.nativeOrder()); nativeECDSABuffer.set(byteBuff); } byteBuff.rewind(); byteBuff.put(data); byteBuff.put(signature); byteBuff.put(pub); byte[][] retByteArray; r.lock(); try { return secp256k1_ecdsa_verify(byteBuff, Secp256k1Context.getContext(), signature.length, pub.length) == 1; } finally { r.unlock(); } } /** * libsecp256k1 Create an ECDSA signature. * * @param data Message hash, 32 bytes * @param key Secret key, 32 bytes * * Return values * @param sig byte array of signature */ public static byte[] sign(byte[] data, byte[] sec) throws AssertFailException{ Preconditions.checkArgument(data.length == 32 && sec.length <= 32); ByteBuffer byteBuff = nativeECDSABuffer.get(); if (byteBuff == null || byteBuff.capacity() < 32 + 32) { byteBuff = ByteBuffer.allocateDirect(32 + 32); byteBuff.order(ByteOrder.nativeOrder()); nativeECDSABuffer.set(byteBuff); } byteBuff.rewind(); byteBuff.put(data); byteBuff.put(sec); byte[][] retByteArray; r.lock(); try { retByteArray = secp256k1_ecdsa_sign(byteBuff, Secp256k1Context.getContext()); } finally { r.unlock(); } byte[] sigArr = retByteArray[0]; int sigLen = new BigInteger(new byte[] { retByteArray[1][0] }).intValue(); int retVal = new BigInteger(new byte[] { retByteArray[1][1] }).intValue(); assertEquals(sigArr.length, sigLen, "Got bad signature length."); return retVal == 0 ? new byte[0] : sigArr; } /** * libsecp256k1 Seckey Verify - returns 1 if valid, 0 if invalid * * @param seckey ECDSA Secret key, 32 bytes */ public static boolean secKeyVerify(byte[] seckey) { Preconditions.checkArgument(seckey.length == 32); ByteBuffer byteBuff = nativeECDSABuffer.get(); if (byteBuff == null || byteBuff.capacity() < seckey.length) { byteBuff = ByteBuffer.allocateDirect(seckey.length); byteBuff.order(ByteOrder.nativeOrder()); nativeECDSABuffer.set(byteBuff); } byteBuff.rewind(); byteBuff.put(seckey); r.lock(); try { return secp256k1_ec_seckey_verify(byteBuff,Secp256k1Context.getContext()) == 1; } finally { r.unlock(); } } /** * libsecp256k1 Compute Pubkey - computes public key from secret key * * @param seckey ECDSA Secret key, 32 bytes * * Return values * @param pubkey ECDSA Public key, 33 or 65 bytes */ //TODO add a 'compressed' arg public static byte[] computePubkey(byte[] seckey) throws AssertFailException{ Preconditions.checkArgument(seckey.length == 32); ByteBuffer byteBuff = nativeECDSABuffer.get(); if (byteBuff == null || byteBuff.capacity() < seckey.length) { byteBuff = ByteBuffer.allocateDirect(seckey.length); byteBuff.order(ByteOrder.nativeOrder()); nativeECDSABuffer.set(byteBuff); } byteBuff.rewind(); byteBuff.put(seckey); byte[][] retByteArray; r.lock(); try { retByteArray = secp256k1_ec_pubkey_create(byteBuff, Secp256k1Context.getContext()); } finally { r.unlock(); } byte[] pubArr = retByteArray[0]; int pubLen = new BigInteger(new byte[] { retByteArray[1][0] }).intValue(); int retVal = new BigInteger(new byte[] { retByteArray[1][1] }).intValue(); assertEquals(pubArr.length, pubLen, "Got bad pubkey length."); return retVal == 0 ? new byte[0]: pubArr; } /** * libsecp256k1 Cleanup - This destroys the secp256k1 context object * This should be called at the end of the program for proper cleanup of the context. */ public static synchronized void cleanup() { w.lock(); try { secp256k1_destroy_context(Secp256k1Context.getContext()); } finally { w.unlock(); } } public static long cloneContext() { r.lock(); try { return secp256k1_ctx_clone(Secp256k1Context.getContext()); } finally { r.unlock(); } } /** * libsecp256k1 PrivKey Tweak-Mul - Tweak privkey by multiplying to it * * @param tweak some bytes to tweak with * @param seckey 32-byte seckey */ public static byte[] privKeyTweakMul(byte[] privkey, byte[] tweak) throws AssertFailException{ Preconditions.checkArgument(privkey.length == 32); ByteBuffer byteBuff = nativeECDSABuffer.get(); if (byteBuff == null || byteBuff.capacity() < privkey.length + tweak.length) { byteBuff = ByteBuffer.allocateDirect(privkey.length + tweak.length); byteBuff.order(ByteOrder.nativeOrder()); nativeECDSABuffer.set(byteBuff); } byteBuff.rewind(); byteBuff.put(privkey); byteBuff.put(tweak); byte[][] retByteArray; r.lock(); try { retByteArray = secp256k1_privkey_tweak_mul(byteBuff,Secp256k1Context.getContext()); } finally { r.unlock(); } byte[] privArr = retByteArray[0]; int privLen = (byte) new BigInteger(new byte[] { retByteArray[1][0] }).intValue() & 0xFF;