1 files changed, 142 insertions, 0 deletions
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/querysigner/QuerySignerApiImplementation.java b/src/main/java/pl/edu/mimuw/cloudatlas/querysigner/QuerySignerApiImplementation.java
new file mode 100644
index 0000000..d1c0e7c
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/querysigner/QuerySignerApiImplementation.java
@@ -0,0 +1,142 @@
+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.security.interfaces.RSAPrivateCrtKey;
+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(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.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 ValueQuery 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 ValueQuery(queryCode, querySignature);
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new RemoteException(e.getLocalizedMessage());
+        }
+    }
+
+    @Override
+    public void validateInstallQuery(String queryName, ValueQuery 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 ValueQuery signUninstallQuery(String queryName) throws RemoteException {
+        return null;
+    }
+
+    // TODO
+    @Override
+    public void validateUninstallQuery(String queryName, ValueQuery query) throws RemoteException {
+
+    }
+
+    @Override
+    public PublicKey getPublicKey() throws RemoteException {
+        return publicKey;
+    }
+
+    @Override
+    public void setPublicKey(PublicKey publicKey) throws RemoteException {
+        this.publicKey = publicKey;
+    }
+
+    @Override
+    public byte[] getQuerySignature(String queryName) throws RemoteException {
+        return queries.get(queryName).getSignature();
+    }
+}