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/*
* Copyright www.jingtum.com Inc.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.jingtum.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.DecimalFormat;
import java.util.Arrays;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import com.jingtum.Jingtum;
import com.jingtum.JingtumMessage;
import com.jingtum.core.crypto.ecdsa.IKeyPair;
import com.jingtum.core.crypto.ecdsa.KeyPair;
import com.jingtum.core.crypto.ecdsa.Seed;
import com.jingtum.exception.InvalidParameterException;
import com.jingtum.model.Amount;
import com.jingtum.model.Memo;
import com.jingtum.model.RelationAmount;
import com.jingtum.model.TrustLine;
import static com.jingtum.core.config.Config.getB58IdentiferCodecs;
/**
* Utility class
* @author jzhao
* @version 1.0
*/
public class Utility {
@SuppressWarnings("unused")
private boolean success;
final protected static char[] hexArray = "0123456789abcdef".toCharArray();
/**
* Convert byte to hex
* @param bytes Input byte array to convert to HEX codes
* @return String
*/
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for ( int j = 0; j < bytes.length; j++ ) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
/**
* Build signature string
* @param address
* @param secret
* @return String
*/
public static String buildSignString(String address, String secret){
/* if(!Jingtum.isSignOn()){ // check if the functionality is turned on
return "?";
}*/
long timestamp = System.currentTimeMillis();
String messageString = Jingtum.getSignString() + address + timestamp;
IKeyPair keyPair = null;
try {
keyPair = Seed.getKeyPair(secret);
} catch (InvalidParameterException e1) {
e1.printStackTrace();
}
//get hash
MessageDigest md = null;
try {
md = MessageDigest.getInstance("SHA-512");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
byte[] digest = md.digest(messageString.getBytes());
byte[] signData = Arrays.copyOfRange(digest, 0, 32);
//get signature
byte[] signature = KeyPair.sign(signData , keyPair.priv());
//transmit hex parameters, they are what we actually need
String messageHex = Utility.bytesToHex(signData);
String signatureHex = Utility.bytesToHex(signature);
String publicKeyHex = keyPair.pubHex();
StringBuffer sb = new StringBuffer();
sb.append("?k=");
sb.append(publicKeyHex);
sb.append("&s=");
sb.append(signatureHex);
sb.append("&h=");
sb.append(messageHex);
sb.append("&t=");
sb.append(timestamp);
return sb.toString();
}
/**
* @param aValue
* @param aKey
* @return hmac string
*/
public static String buildHmac(String aValue, String aKey){
byte k_ipad[] = new byte[64];
byte k_opad[] = new byte[64];
byte keyb[];
byte value[];
try {
keyb = aKey.getBytes("UTF-8");
value = aValue.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
keyb = aKey.getBytes();
value = aValue.getBytes();
}
Arrays.fill(k_ipad, keyb.length, 64, (byte) 54);
Arrays.fill(k_opad, keyb.length, 64, (byte) 92);
for (int i = 0; i < keyb.length; i++) {
k_ipad[i] = (byte) (keyb[i] ^ 0x36);
k_opad[i] = (byte) (keyb[i] ^ 0x5c);
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
return null;
}
md.update(k_ipad);
md.update(value);
byte dg[] = md.digest();
md.reset();
md.update(k_opad);
md.update(dg, 0, 16);
dg = md.digest();
return Utility.bytesToHex(dg);
}
/**
* Validate the address and secret pair
* @param address
* @param secret
* @return true if the address and secret is valid
*/
public static boolean validateKeyPair(String address, String secret){
String myAddress = null;
try {
myAddress = Seed.computeAddress(secret); // compute address from secret
} catch (Exception e) {
return false;
}
if(Utility.isNotEmpty(address) && address.equals(myAddress)){
return true;
}
return false;
}
/**
* Verify if an address is valid
* @param address
* @return true if address is valid
*/
public static boolean isValidAddress(String address){
try{
getB58IdentiferCodecs().decodeAddress(address);
}
catch(Exception e){
return false;
}
return true;
}
/**
* Verify if the secret is valid
* @param secret
* @return true if secret is valid
*/
@SuppressWarnings("unused")
public static boolean isValidSecret(String secret){
try {
String myAddress = Seed.computeAddress(secret);
} catch (Exception e) {
return false;
}
return true;
}
/**
* Verify if the currency is valid
* @param currency
* @return true if the currency is valid
*/
public static boolean isValidCurrency(String currency){
// Currently only check the length of the currency
if(currency != null && ( currency.length() == 3 || currency.length() == 40 )){
return true;
}
return false;
}
/**
* Return true if string is not null or empty
* @param str
* @return true if string is not null or empty
*/
public static boolean isNotEmpty(String str){
return !isEmpty(str);
}
/**
* Return true if string is null or empty
* @param str
* @return true if string is null or empty
*/
public static boolean isEmpty(String str){
return null == str || "".equals(str);
}
/**
* Get the String format of double value
* @param value
* @return String
*/
public static String doubleToString(double value){
DecimalFormat df = new DecimalFormat("#0.0######");
return df.format(value);
}
/**
* Check if the JingtumAmount is valid
* @param amount
* @return true if the JingtumAmount is valid
*/
public static boolean isValidAmount(Amount amount){
return (amount != null) && isValidCurrency(amount.getCurrency()) && isValidAddress(amount.getIssuer())
|| ((amount != null) && Jingtum.getCurrencySWT().equals(amount.getCurrency()) && "".equals(amount.getIssuer()));
}
/**
* Check if the Memo is valid
* @param in_memo
* @return true if the JingtumAmount is valid
*/
public static boolean isValidMemo(Memo in_memo){
return (in_memo != null);
//TO DO:make better check
}
/**
* Check if the RelationAmount is valid
* @param amount
* @return true if the RelationAmount is valid
*/
public static boolean isValidRelationAmount(RelationAmount amount){
return (amount != null) && isValidCurrency(amount.getCurrency()) && isValidAddress(amount.getIssuer())
|| ((amount != null) && Jingtum.getCurrencySWT().equals(amount.getCurrency()) && "".equals(amount.getIssuer()));
}
/**
* Check if the trustline is valid
* @param trustline
* @return true if the trustline is valid
*/
public static boolean isValidTrustline(TrustLine trustline){
return ((trustline != null) && isValidCurrency(trustline.getCurrency()) && isValidAddress(trustline.getCounterparty()))
|| ((trustline != null) && Jingtum.getCurrencySWT().equals(trustline.getCurrency()) && "".equals(trustline.getCounterparty()));
}
/**
* sync call
*/
public static void callback(Runnable runnable){
//Later all runnables in one ExecutorService?
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(runnable);
exec.shutdown();
}
/**
* Verify if an input string is a valid Tum code
* with the format
* Tum code : Tum issuer
* @param in_str
* @return true if address is valid
*/
public static boolean isValidTumString(String in_str){
String[] str_array = in_str.split(":");
if(str_array.length == 2){
//check if the 2nd param is a valid Jingtum address
if (Utility.isValidAddress(str_array[1]))
return true;
}
return false;
}
/**
* Return the Tum string from the input Amount object
* @param in_amt
* @return String of Tum as currency:issuer
*/
public static String getTumString(Amount in_amt) throws InvalidParameterException {
if (isValidAmount(in_amt)){
if ( in_amt.getCurrency() == "SWT"){
return in_amt.getCurrency();
}else{
return in_amt.getCurrency()+":"+in_amt.getIssuer();
}
}else
throw new InvalidParameterException(JingtumMessage.INVALID_JINGTUM_AMOUNT, in_amt.getCurrency()+":"+in_amt.getIssuer(), null);
}
/**
* Return the Tum pair string from the input base and counter Amount objects
* @param base_amt
* @param counter_amt
* @return String of Tum as currency:issuer
*/
public static String getTumPair (Amount base_amt, Amount counter_amt) throws InvalidParameterException {
return getTumString(base_amt)+"/"+getTumString(counter_amt);
}
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