Introducing the CreateHtlcOperation & supporting classes
- HtlcHashType class enumerates all supported HTLC hash functions. - The HtlcHash class is used to represent all possible HTLC hash results. - The CreateHtlcOperation class itself is used to represent the operation that creates an HTLC - A simple test class was introduced in order to test hash functions and subsequently also test the HTLC operation serializationdevelop
Nelson R. Perez
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package cy.agorise.graphenej;
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import com.google.common.primitives.Bytes;
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import cy.agorise.graphenej.interfaces.ByteSerializable;
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/**
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* Class used to represent a HTLC hash.
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*/
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public class HtlcHash implements ByteSerializable {
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private HtlcHashType hashType;
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private byte[] hash;
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public HtlcHash(HtlcHashType hashType, byte[] hash) {
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this.hashType = hashType;
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this.hash = hash;
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}
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@Override
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public byte[] toBytes() {
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byte[] hashTypeBytes = new byte[] { Util.revertInteger(hashType.ordinal())[3] };
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return Bytes.concat(hashTypeBytes, hash);
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}
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}
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package cy.agorise.graphenej;
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/**
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* Used to enumerate the possible hash algorithms used in HTLCs.
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* @see <a href="https://github.com/bitshares/bitshares-core/blob/623aea265f2711adade982fc3248e6528dc8ac51/libraries/chain/include/graphene/chain/protocol/htlc.hpp">htlc.hpp</a>
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*/
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public enum HtlcHashType {
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RIPEMD160,
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SHA1,
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SHA256
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}
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package cy.agorise.graphenej.operations;
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import com.google.common.primitives.Bytes;
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import cy.agorise.graphenej.AssetAmount;
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import cy.agorise.graphenej.BaseOperation;
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import cy.agorise.graphenej.HtlcHash;
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import cy.agorise.graphenej.OperationType;
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import cy.agorise.graphenej.UserAccount;
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import cy.agorise.graphenej.Util;
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public class CreateHtlcOperation extends BaseOperation {
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private AssetAmount fee;
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private UserAccount from;
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private UserAccount to;
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private AssetAmount amount;
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private HtlcHash preimageHash;
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private short preimageSize;
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private int claimPeriodSeconds;
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/**
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* Public constructor
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*
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* @param fee The operation fee.
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* @param from The source account.
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* @param to The destination account.
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* @param amount The amount to be traded.
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* @param hash The pre-image hash.
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* @param preimageSize The pre-image size.
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* @param claimPeriodSeconds The claim period, in seconds.
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*/
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public CreateHtlcOperation(AssetAmount fee, UserAccount from, UserAccount to, AssetAmount amount, HtlcHash hash, short preimageSize, int claimPeriodSeconds) {
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super(OperationType.HTLC_CREATE_OPERATION);
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this.fee = fee;
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this.from = from;
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this.to = to;
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this.amount = amount;
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this.preimageHash = hash;
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this.preimageSize = preimageSize;
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this.claimPeriodSeconds = claimPeriodSeconds;
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}
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@Override
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public void setFee(AssetAmount newFee){
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this.fee = newFee;
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}
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public AssetAmount getFee() {
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return fee;
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}
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public UserAccount getFrom() {
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return from;
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}
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public void setFrom(UserAccount from) {
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this.from = from;
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}
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public UserAccount getTo() {
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return to;
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}
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public void setTo(UserAccount to) {
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this.to = to;
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}
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public AssetAmount getAmount() {
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return amount;
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}
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public void setAmount(AssetAmount amount) {
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this.amount = amount;
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}
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public HtlcHash getPreimageHash() {
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return preimageHash;
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}
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public void setPreimageHash(HtlcHash preimageHash) {
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this.preimageHash = preimageHash;
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}
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public short getPreimageSize() {
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return preimageSize;
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}
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public void setPreimageSize(short preimageSize) {
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this.preimageSize = preimageSize;
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}
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public int getClaimPeriodSeconds() {
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return claimPeriodSeconds;
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}
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public void setClaimPeriodSeconds(int claimPeriodSeconds) {
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this.claimPeriodSeconds = claimPeriodSeconds;
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}
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@Override
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public byte[] toBytes() {
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byte[] feeBytes = fee.toBytes();
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byte[] fromBytes = from.toBytes();
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byte[] toBytes = to.toBytes();
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byte[] amountBytes = amount.toBytes();
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byte[] htlcHashBytes = preimageHash.toBytes();
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byte[] preimageSizeBytes = Util.revertShort(preimageSize);
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byte[] claimPeriodBytes = Util.revertInteger(claimPeriodSeconds);
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byte[] extensionsBytes = extensions.toBytes();
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return Bytes.concat(feeBytes, fromBytes, toBytes, amountBytes, htlcHashBytes, preimageSizeBytes, claimPeriodBytes, extensionsBytes);
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}
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@Override
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public String toJsonString() {
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return null;
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}
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}
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package cy.agorise.graphenej.operations;
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import com.google.common.primitives.UnsignedLong;
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import org.junit.Assert;
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import org.junit.Test;
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import java.security.NoSuchAlgorithmException;
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import cy.agorise.graphenej.Asset;
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import cy.agorise.graphenej.AssetAmount;
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import cy.agorise.graphenej.HtlcHash;
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import cy.agorise.graphenej.HtlcHashType;
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import cy.agorise.graphenej.UserAccount;
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import cy.agorise.graphenej.Util;
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public class CreateHtlcOperationTest {
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private final String SERIALIZED_OP = "f68585abf4dce7c8045701310000000000000000007b7c80241100000000000000a06e327ea7388c18e4740e350ed4e60f2e04fc41c80078000000000001";
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private final String PREIMAGE_HEX = "666f6f626172";
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private final String HASH_RIPEMD160 = "a06e327ea7388c18e4740e350ed4e60f2e04fc41";
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private final String HASH_SHA1 = "8843d7f92416211de9ebb963ff4ce28125932878";
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private final String HASH_SHA256 = "c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2";
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private final Asset CORE = new Asset("1.3.0");
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@Test
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public void testRipemd160(){
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try {
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byte[] hashRipemd160 = Util.htlcHash(Util.hexToBytes(PREIMAGE_HEX), HtlcHashType.RIPEMD160);
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String hexHash = Util.bytesToHex(hashRipemd160);
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Assert.assertEquals(HASH_RIPEMD160, hexHash);
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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}
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}
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@Test
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public void testSha1(){
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try {
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byte[] hashSha1 = Util.htlcHash(Util.hexToBytes(PREIMAGE_HEX), HtlcHashType.SHA1);
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String hexHash = Util.bytesToHex(hashSha1);
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Assert.assertEquals(HASH_SHA1, hexHash);
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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}
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}
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@Test
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public void testSha256(){
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try {
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byte[] hashSha256 = Util.htlcHash(Util.hexToBytes(PREIMAGE_HEX), HtlcHashType.SHA256);
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String hexHash = Util.bytesToHex(hashSha256);
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Assert.assertEquals(HASH_SHA256, hexHash);
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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}
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}
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//TODO: Implement operation test
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public void testOperationSerialization() throws NoSuchAlgorithmException {
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UserAccount from = new UserAccount("1.2.123");
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UserAccount to = new UserAccount("1.2.124");
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AssetAmount fee = new AssetAmount(UnsignedLong.valueOf(0), CORE);
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AssetAmount amount = new AssetAmount(UnsignedLong.valueOf(1123456), CORE);
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byte[] hashBytes = Util.htlcHash("foobar".getBytes(), HtlcHashType.RIPEMD160);
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HtlcHash preimageHash = new HtlcHash(HtlcHashType.RIPEMD160, hashBytes);
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CreateHtlcOperation operation = new CreateHtlcOperation(fee, from, to, amount, preimageHash, (short) 200, 120);
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}
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}
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