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package pl.edu.mimuw.cloudatlas;
import java.io.*;
import java.security.*;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
public class KeyGenerator {
private final static int NUM_KEY_BITS = 1024;
private final static String ENCRYPTION_ALGORITHM = "RSA";
// TODO
private static void printKeyToFile(byte[] keyValue, String fileName) {
System.out.println("\n BEGIN KEY");
for (byte k : keyValue) {
System.out.print(k);
}
System.out.println("\n EOF KEY");
String keyString = new String(keyValue);
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
writer.write(keyString);
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private static void generateKeys() throws NoSuchAlgorithmException {
PublicKey publicKey;
PrivateKey privateKey;
KeyPairGenerator keyGenerator =
KeyPairGenerator.getInstance(ENCRYPTION_ALGORITHM);
keyGenerator.initialize(NUM_KEY_BITS);
KeyPair keyPair = keyGenerator.generateKeyPair();
String publicKeyFile = System.getProperty("public_key_file");
String privateKeyFile = System.getProperty("private_key_file");
privateKey = keyPair.getPrivate();
printKeyToFile(privateKey.getEncoded(), privateKeyFile);
publicKey = keyPair.getPublic();
printKeyToFile(publicKey.getEncoded(), publicKeyFile);
}
public static PublicKey getPublicKey(String key){
try {
byte[] byteKey = Base64.getDecoder().decode(key.getBytes());
X509EncodedKeySpec X509publicKey = new X509EncodedKeySpec(byteKey);
KeyFactory kf = KeyFactory.getInstance(ENCRYPTION_ALGORITHM);
return kf.generatePublic(X509publicKey);
} catch(Exception e) {
e.printStackTrace();
}
return null;
}
public static PrivateKey getPrivateKey(String key){
try {
byte[] byteKey = Base64.getDecoder().decode(key.getBytes());
X509EncodedKeySpec X509publicKey = new X509EncodedKeySpec(byteKey);
KeyFactory kf = KeyFactory.getInstance(ENCRYPTION_ALGORITHM);
return kf.generatePrivate(X509publicKey);
} catch(Exception e) {
e.printStackTrace();
}
return null;
}
public static String readKeyFromFile(String filename) throws IOException {
String key;
BufferedReader reader = new BufferedReader(new FileReader(filename));
key = reader.readLine();
reader.close();
return key;
}
public static void main(String[] args) {
try {
generateKeys();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
}
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