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genopri-shcs/project/PPPCommons/src/utils/ECPointMapSerializer.java
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ECPointMapSerializer.java
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package utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
public class ECPointMapSerializer {
private static final Logger LOGGER = Logger.getLogger(ECPointMapSerializer.class.getName());
private ECCurve curve;
private File filepath;
public ECPointMapSerializer(ECCurve curve, File filepath) {
this.curve = curve;
this.filepath = filepath;
}
public void writeECMap(HashMap<ECPoint, BigInteger> map) {
FileOutputStream fos = null;
ObjectOutputStream oos = null;
try {
fos = new FileOutputStream(filepath);
oos = new ObjectOutputStream(fos);
int size = map.size();
Iterator<Map.Entry<ECPoint, BigInteger>> i =
(size > 0)? map.entrySet().iterator() : null;
// write size
oos.writeInt(size);
// write out keys and values (alternating)
if (i != null) {
while(i.hasNext()) {
Map.Entry<ECPoint, BigInteger> e = i.next();
oos.writeObject(e.getKey().getEncoded());
oos.writeObject(e.getValue().toByteArray());
}
}
} catch (FileNotFoundException e) {
LOGGER.log(Level.SEVERE, null, e);
e.printStackTrace();
} catch (IOException e) {
LOGGER.log(Level.SEVERE, null, e);
e.printStackTrace();
} finally {
try {
oos.close();
fos.close();
} catch (IOException e) {
LOGGER.log(Level.SEVERE, null, e);
e.printStackTrace();
}
}
}
public HashMap<ECPoint, BigInteger> readECMap() {
HashMap<ECPoint, BigInteger> map = null;
FileInputStream fis = null;
ObjectInputStream ois = null;
try {
fis = new FileInputStream(filepath);
ois = new ObjectInputStream(fis);
// read size
int size = ois.readInt();
// initialize map
map = new HashMap<>(size);
for (int i = 0; i < size; i++) {
// decode key and value
byte[] encodedKey = (byte[]) ois.readObject();
byte[] encodedValue = (byte[]) ois.readObject();
ECPoint key = curve.decodePoint(encodedKey);
BigInteger value = new BigInteger(encodedValue);
// put pair
map.put(key, value);
}
} catch (FileNotFoundException e) {
LOGGER.log(Level.SEVERE, null, e);
e.printStackTrace();
} catch (IOException e) {
LOGGER.log(Level.SEVERE, null, e);
e.printStackTrace();
} catch (ClassNotFoundException e) {
LOGGER.log(Level.SEVERE, null, e);
e.printStackTrace();
} finally {
try {
ois.close();
fis.close();
} catch (IOException e) {
LOGGER.log(Level.SEVERE, null, e);
e.printStackTrace();
}
}
return map;
}
}
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