From da5df3957ba41d28256ab8183aae0dd3b6e0dcba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Magdalena=20Grodzi=C5=84ska?= <mag.grodzinska@gmail.com>
Date: Sun, 12 Jan 2020 21:05:28 +0100
Subject: Add query signer architecture

---
 .../querysigner/QuerySignerApiImplementation.java  | 112 +++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 src/main/java/pl/edu/mimuw/cloudatlas/querysigner/QuerySignerApiImplementation.java

(limited to 'src/main/java/pl/edu/mimuw/cloudatlas/querysigner/QuerySignerApiImplementation.java')

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..38a86c6
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/querysigner/QuerySignerApiImplementation.java
@@ -0,0 +1,112 @@
+package pl.edu.mimuw.cloudatlas.querysigner;
+
+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 PublicKey publicKey;
+    private PrivateKey privateKey;
+    private final static String ENCRYPTION_ALGORITHM = "RSA";
+    private final static int NUM_KEY_BITS = 1024;
+    private Map<String, ValueQuery> queries;
+    private Set<String> attribsSetByQueries;
+
+    QuerySignerApiImplementation() {
+        this.queries = new HashMap<>();
+        this.attribsSetByQueries = new HashSet<>();
+        try {
+            generateKeys();
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        }
+    }
+
+    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 void generateKeys() throws NoSuchAlgorithmException {
+        KeyPairGenerator keyGenerator =
+                KeyPairGenerator.getInstance(ENCRYPTION_ALGORITHM);
+        keyGenerator.initialize(NUM_KEY_BITS);
+        KeyPair keyPair = keyGenerator.generateKeyPair();
+        this.privateKey = keyPair.getPrivate();
+        this.publicKey = keyPair.getPublic();
+    }
+
+    private byte[] encryptQuery(String query) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
+        Cipher signCipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
+        signCipher.init(Cipher.ENCRYPT_MODE, privateKey);
+        byte[] encryptedBytes = signCipher.doFinal(query.getBytes());
+        System.out.println(
+                "Bytes encrypted with " + ENCRYPTION_ALGORITHM +
+                        ": " + byteArrayToString(
+                        encryptedBytes, 0, encryptedBytes.length));
+        return encryptedBytes;
+    }
+
+    private String 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 new String(decryptedBytes);
+    }
+
+    @Override
+    public byte[] signQuery(String queryName, String queryCode) throws RemoteException {
+        try {
+            return encryptQuery(queryName + queryCode);
+        } catch (NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeyException | BadPaddingException | IllegalBlockSizeException e) {
+            e.printStackTrace();
+            throw new RemoteException(e.getLocalizedMessage());
+        }
+    }
+
+    @Override
+    public String checkQuery(byte[] encryptedQuery, String queryName, String queryCode) throws RemoteException {
+        try {
+            return decryptQuery(encryptedQuery);
+        } catch (NoSuchPaddingException | NoSuchAlgorithmException | BadPaddingException | IllegalBlockSizeException | InvalidKeyException e) {
+            e.printStackTrace();
+            throw new RemoteException(e.getLocalizedMessage());
+        }
+    }
+
+    @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();
+    }
+}
-- 
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