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package pl.edu.mimuw.cloudatlas.querysigner;
import pl.edu.mimuw.cloudatlas.ByteSerializer;
import pl.edu.mimuw.cloudatlas.model.ValueQuery;
import pl.edu.mimuw.cloudatlas.querysignerapi.QuerySignerApi;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.rmi.RemoteException;
import java.security.*;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class QuerySignerApiImplementation implements QuerySignerApi {
private final static String ENCRYPTION_ALGORITHM = "RSA";
private final static String DIGEST_ALGORITHM = "SHA-256";
private PublicKey publicKey;
private PrivateKey privateKey;
private Map<String, ValueQuery> queries;
private Set<String> attribsSetByQueries;
private ByteSerializer byteSerializer;
QuerySignerApiImplementation(PublicKey publicKey, PrivateKey privateKey) {// (byte[] serializedPublicKey, byte[] serializedPrivateKey) {
this.byteSerializer = new ByteSerializer();
// this.publicKey = (PublicKey) byteSerializer.deserialize(serializedPublicKey, PublicKey.class);
// this.privateKey = (PrivateKey) byteSerializer.deserialize(serializedPrivateKey, PrivateKey.class);
this.publicKey = publicKey;
this.privateKey = privateKey;
this.queries = new HashMap<>();
this.attribsSetByQueries = new HashSet<>();
}
private String byteArrayToString(byte[] arr, int offset, int len) {
StringBuffer sb = new StringBuffer();
for (int i = offset, n = Math.min(arr.length, offset + len); i < n; ++i) {
String hex = Integer.toHexString(0xFF & arr[i]);
if (hex.length() < 2) {
sb.append('0');
}
sb.append(hex);
}
return sb.toString();
}
private byte[] encryptQuery(byte[] query) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
Cipher signCipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
signCipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] encryptedBytes = signCipher.doFinal(query);
System.out.println(
"Bytes encrypted with " + ENCRYPTION_ALGORITHM +
": " + byteArrayToString(
encryptedBytes, 0, encryptedBytes.length));
return encryptedBytes;
}
private byte[] decryptQuery(byte[] encryptedQuery) throws NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException {
Cipher verifyCipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
verifyCipher.init(Cipher.DECRYPT_MODE, publicKey);
byte[] decryptedBytes = verifyCipher.doFinal(encryptedQuery);
System.out.println(
"Bytes decrypted with " + ENCRYPTION_ALGORITHM +
": " + byteArrayToString(
decryptedBytes, 0, decryptedBytes.length));
return decryptedBytes;
}
private byte[] cryptographicHash(byte[] serializedQuery) throws NoSuchAlgorithmException {
MessageDigest digestGenerator =
MessageDigest.getInstance(DIGEST_ALGORITHM);
byte[] digest = digestGenerator.digest(serializedQuery);
System.out.println(
DIGEST_ALGORITHM + " digest: " +
byteArrayToString(
digest, 0, digest.length));
return digest;
}
// TODO
private byte[] serializeQuery(String queryName, String queryCode) {
return byteSerializer.serialize(queryName + queryCode);
}
@Override
public QueryData signInstallQuery(String queryName, String queryCode) throws RemoteException {
QueryUtils.validateQueryName(queryName);
try {
byte[] serializedQuery = serializeQuery(queryName, queryCode);
byte[] hashedQuery = cryptographicHash(serializedQuery);
byte[] querySignature = encryptQuery(hashedQuery);
return new QueryData(queryCode, querySignature);
} catch (Exception e) {
e.printStackTrace();
throw new RemoteException(e.getLocalizedMessage());
}
}
@Override
public void validateInstallQuery(String queryName, QueryData query) throws RemoteException {
QueryUtils.validateQueryName(queryName);
try {
byte[] decryptedQuery = decryptQuery(query.getSignature());
byte[] serializedQuery = serializeQuery(queryName, query.getCode());
byte[] hashedSerializedQuery = cryptographicHash(serializedQuery);
if (hashedSerializedQuery != decryptedQuery) {
throw new QuerySigner.InvalidQueryException();
}
} catch (NoSuchPaddingException | NoSuchAlgorithmException | BadPaddingException | IllegalBlockSizeException | InvalidKeyException | QuerySigner.InvalidQueryException e) {
e.printStackTrace();
throw new RemoteException(e.getLocalizedMessage());
}
}
// TODO
@Override
public QueryData signUninstallQuery(String queryName) throws RemoteException {
return null;
}
// TODO
@Override
public void validateUninstallQuery(String queryName, QueryData query) throws RemoteException {
}
}
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