public boolean shareAESkey() {
try {
Envelope message = null, e = null;
// Generate AES key
KeyGenerator keyGen = KeyGenerator.getInstance("AES");
AESkey = keyGen.generateKey();
keyGen = KeyGenerator.getInstance("HmacSHA1");
HMACkey = keyGen.generateKey();
byte[] keyBytes = AESkey.getEncoded();
byte[] hashBytes = HMACkey.getEncoded();
System.out.println("AES key generated");
System.out.println("HMAC key generated");
System.out.println("Begin Encryption...");
// Encrypt message w/ provided public key
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] cipherBytes = cipher.doFinal(keyBytes);
byte[] cipherBytes1 = cipher.doFinal(hashBytes);
System.out.println("Encryption Complete");
message = new Envelope("SKEY");
message.addObject(cipherBytes); // Add AESkey to message
message.addObject(cipherBytes1);
message.addObject(nonce);
nonce++;
byte[] messageBytes = Envelope.toByteArray(message);
output.writeObject(messageBytes);
byte[] inCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, AESkey);
byte[] responseBytes = cipher.doFinal(inCipherBytes);
Envelope response = Envelope.getEnvelopefromBytes(responseBytes);
// If server indicates success, return the member list
if (response.getMessage().equals("OK")
&& (Integer) response.getObjContents().get(0) == nonce) {
return true;
} else {
return false;
}
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
e.printStackTrace(System.err);
return false;
}
}
public String getFingerprint() {
try {
Envelope e = new Envelope("GETFPRINT");
e.addObject(nonce);
nonce++;
byte[] messageBytes = Envelope.toByteArray(e);
// send message to request host key's hash
output.writeObject(messageBytes);
// receive host key hash
e = Envelope.getEnvelopefromBytes((byte[]) input.readObject());
if (e.getMessage().equals("OK") && (Integer) e.getObjContents().get(2) == nonce) {
nonce++;
// check publicKey File for server and fingerprint match
// TODO
pubKey = (PublicKey) e.getObjContents().get(0);
return (String) e.getObjContents().get(1);
} else {
System.out.println("Nonce FAIL GETFPRINT");
disconnect();
return null;
}
} catch (ClassNotFoundException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
return null;
} catch (IOException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
return null;
}
}
public void disconnect() {
if (isConnected()) {
try {
Envelope message = new Envelope("DISCONNECT");
message.addObject(messageIndex);
output.writeObject(encryptCipher.doFinal(message.getBytes()));
sock.close();
sock = null;
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
e.printStackTrace(System.err);
}
}
}
public boolean upload(
String sourceFile, String destFile, String group, UserToken token, Key key, int keyNum) {
if (destFile.charAt(0) != '/') {
destFile = "/" + destFile;
}
try {
FileInputStream fis = new FileInputStream(sourceFile);
File encryptFile = new File(sourceFile + "_encrypt");
encryptFile.createNewFile();
FileOutputStream fos = new FileOutputStream(encryptFile);
// Initial Vector must be 16 bytes
byte[] initialVector = {
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf
};
IvParameterSpec ivs = new IvParameterSpec(initialVector);
byte[] buf = new byte[1024];
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, key, ivs);
byte[] cipherBytes;
// create a new local encrypted file
do {
buf = new byte[1024];
int n = fis.read(buf);
if (n > 0) {
System.out.printf(".");
} else if (n < 0) {
System.out.println("Read error");
}
cipherBytes = cipher.doFinal(buf);
fos.write(cipherBytes);
} while (fis.available() > 0);
System.out.println();
// send encrypted file to server
Envelope message = null, env = null;
// Tell the server to return the member list
message = new Envelope("UPLOADF");
message.addObject(destFile);
message.addObject(group);
message.addObject(token);
message.addObject(keyNum);
message.addObject(initialVector);
String concat =
destFile
+ group
+ token.toString()
+ keyNum
+ "UPLOADF"
+ nonce; // concatinates all of the objects in envelope
byte[] hasharray = concat.getBytes(); // turn the concat into a byte array
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
String stringhash =
new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
message.addObject(stringhash);
message.addObject(nonce);
nonce++;
byte[] messageBytes = Envelope.toByteArray(message);
// Encrypt envelope w/ AES
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
cipherBytes = cipher.doFinal(messageBytes);
output.writeObject(cipherBytes);
byte[] responseCipherBytes =
(byte[])
input.readObject(); // if response isnt ready it should check whether it was forged
// Decrypt response
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, AESkey);
byte[] responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
if (env.getMessage().equals("READY")) {
System.out.printf("Meta data upload successful\n");
} else if ((Integer) env.getObjContents().get(1) == nonce) {
String hash = (String) env.getObjContents().get(0);
concat = env.getMessage() + nonce; // reconstructs the hash
hasharray = concat.getBytes();
mac = Mac.getInstance("HmacSHA1");
File HASHfile = new File("FHASHKey.bin");
fis = new FileInputStream(HASHfile);
ObjectInputStream ois = new ObjectInputStream(fis);
Key HMACkey = (Key) ois.readObject();
mac.init(HMACkey);
mac.update(hasharray);
String newhash = new String(mac.doFinal(), "UTF8");
nonce++;
// check hashes for equality
if (hash.equals(newhash) != true) {
System.out.println("HASH EQUALITY FAIL2, disconnecting for your own safety");
disconnect();
return false;
}
} else {
System.out.println("Nonce FAIL UPLOADF");
disconnect();
return false;
}
// If server indicates success, return the member list
FileInputStream encryptFIS = new FileInputStream(encryptFile);
do {
if ((Integer) env.getObjContents().get(1) == nonce) {
buf = new byte[1024];
if (!env.getMessage().equals("READY")) {
System.out.printf("Server error: %s\n", env.getMessage());
return false;
}
String hash = (String) env.getObjContents().get(0);
concat = env.getMessage() + nonce; // reconstructs the hash
hasharray = concat.getBytes();
mac = Mac.getInstance("HmacSHA1");
File HASHfile = new File("FHASHKey.bin");
fis = new FileInputStream(HASHfile);
ObjectInputStream ois = new ObjectInputStream(fis);
Key HMACkey = (Key) ois.readObject();
mac.init(HMACkey);
mac.update(hasharray);
String newhash = new String(mac.doFinal(), "UTF8");
nonce++;
ois.close();
// check hashes for equality
if (hash.equals(newhash) != true) {
System.out.println("HASH EQUALITY FAIL3, disconnecting for your own safety");
disconnect();
return false;
}
message = new Envelope("CHUNK");
int n = encryptFIS.read(buf); // can throw an IOException
if (n > 0) {
System.out.printf(".");
} else if (n < 0) {
System.out.println("Read error");
return false;
}
message.addObject(buf);
message.addObject(new Integer(n));
concat = n + "CHUNK" + nonce; // concatinates all of the objects in envelope
hasharray = concat.getBytes(); // turn the concat into a byte array
mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
stringhash =
new String(
mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
message.addObject(stringhash);
message.addObject(nonce);
nonce++;
messageBytes = Envelope.toByteArray(message);
// Encrypt envelope w/ AES
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
cipherBytes = cipher.doFinal(messageBytes);
System.out.println("Concatsent" + concat);
output.writeObject(
cipherBytes); ///////////////////////////////////////////
// HERE/////////////////////////////////
responseCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher.init(Cipher.DECRYPT_MODE, AESkey);
responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
} else {
System.out.println("Nonce FAIL UPLOADF");
disconnect();
return false;
}
} while (encryptFIS.available() > 0);
encryptFIS.close();
// If server indicates success, return the member list
if (env.getMessage().compareTo("READY") == 0
&& (Integer) env.getObjContents().get(1) == nonce) {
nonce++;
message = new Envelope("EOF");
concat = "EOF" + nonce; // concatinates all of the objects in envelope
hasharray = concat.getBytes(); // turn the concat into a byte array
mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
stringhash =
new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
message.addObject(stringhash);
message.addObject(nonce);
System.out.println(nonce);
nonce++;
messageBytes = Envelope.toByteArray(message);
// Encrypt envelope w/ AES
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
cipherBytes = cipher.doFinal(messageBytes);
output.writeObject(cipherBytes);
responseCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher.init(Cipher.DECRYPT_MODE, AESkey);
responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
if (env.getMessage().compareTo("OK") == 0
&& (Integer) env.getObjContents().get(1) == nonce) {
System.out.printf("\nFile data upload successful\n");
} else if ((Integer) env.getObjContents().get(1) != nonce) {
System.out.println("Nonce FAIL UPLOADF");
disconnect();
return false;
} else {
System.out.printf("\nUpload failed: %s\n", env.getMessage());
return false;
}
} else if ((Integer) env.getObjContents().get(1) != nonce) {
System.out.println("Nonce FAIL UPLOADF");
disconnect();
return false;
} else {
System.out.printf("Upload failed: %s\n", env.getMessage());
return false;
}
} catch (Exception e1) {
System.err.println("Error: " + e1.getMessage());
e1.printStackTrace(System.err);
return false;
}
return true;
}
@SuppressWarnings("unchecked")
public List<String> listFiles(UserToken token) {
try {
Envelope env = null, e = null;
// Tell the server to return the member list
env = new Envelope("LFILES");
env.addObject(token); // Add requester's token
String concat =
token.toString() + "LFILES" + nonce; // concatinates all of the objects in envelope
byte[] hasharray = concat.getBytes(); // turn the concat into a byte array
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
String stringhash =
new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
env.addObject(stringhash);
env.addObject(nonce);
nonce++;
byte[] envBytes = Envelope.toByteArray(env);
// Encrypt envelope w/ AES
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
byte[] cipherBytes = cipher.doFinal(envBytes);
output.writeObject(cipherBytes);
byte[] responseCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher.init(Cipher.DECRYPT_MODE, AESkey);
byte[] responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
if (env.getMessage().equals("FAIL")) {
System.out.println("Error occured in ListFiles, disconnecting");
disconnect();
return null;
} else if ((Integer) env.getObjContents().get(2) == nonce) {
List<String> files = (List<String>) env.getObjContents().get(0);
String hash = (String) env.getObjContents().get(1);
concat = files.toString() + env.getMessage() + nonce; // reconstructs the hash
hasharray = concat.getBytes();
mac = Mac.getInstance("HmacSHA1");
File HASHfile = new File("FHASHKey.bin");
FileInputStream fis = new FileInputStream(HASHfile);
ObjectInputStream ois = new ObjectInputStream(fis);
Key HMACkey = (Key) ois.readObject();
mac.init(HMACkey);
mac.update(hasharray);
String newhash = new String(mac.doFinal(), "UTF8");
nonce++;
// check hashes for equality
if (hash.equals(newhash) != true) {
System.out.println("HASH EQUALITY FAIL");
disconnect();
} else {
// If server indicates success, return the member list
if (env.getMessage().equals("OK")) {
return files; // This cast creates compiler warnings. Sorry.
}
}
} else {
System.out.println("Nonce FAIL LFILES");
disconnect();
return null;
}
return null;
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
e.printStackTrace(System.err);
return null;
}
}
public boolean delete(String filename, UserToken token) {
try {
String remotePath;
if (filename.charAt(0) == '/') {
remotePath = filename.substring(1);
} else {
remotePath = filename;
}
Envelope env = new Envelope("DELETEF"); // Success
env.addObject(remotePath);
env.addObject(token);
String concat =
remotePath
+ token.toString()
+ "DELETEF"
+ nonce; // concatinates all of the objects in envelope
byte[] hasharray = concat.getBytes(); // turn the concat into a byte array
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
String stringhash =
new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
env.addObject(stringhash);
env.addObject(nonce);
nonce++;
byte[] envBytes = Envelope.toByteArray(env);
// Encrypt envelope w/ AES
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
byte[] cipherBytes = cipher.doFinal(envBytes);
output.writeObject(cipherBytes);
byte[] responseCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher.init(Cipher.DECRYPT_MODE, AESkey);
byte[] responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
System.out.println(env.getMessage());
if ((Integer) env.getObjContents().get(1) == nonce) {
String hash = (String) env.getObjContents().get(0);
concat = env.getMessage() + nonce; // reconstructs the hash
hasharray = concat.getBytes();
mac = Mac.getInstance("HmacSHA1");
File HASHfile = new File("FHASHKey.bin");
FileInputStream fis = new FileInputStream(HASHfile);
ObjectInputStream ois = new ObjectInputStream(fis);
Key HMACkey = (Key) ois.readObject();
mac.init(HMACkey);
mac.update(hasharray);
String newhash = new String(mac.doFinal(), "UTF8");
nonce++;
if (hash.equals(newhash) != true) // check hashes for equality
{
System.out.println("HASH EQUALITY FAIL");
return false;
}
if (env.getMessage().compareTo("OK") == 0) {
System.out.printf("File %s deleted successfully\n", filename);
} else {
System.out.printf("Error deleting file %s (%s)\n", filename, env.getMessage());
return false;
}
}
} catch (IllegalBlockSizeException ex) {
ex.printStackTrace(System.err);
} catch (BadPaddingException ex) {
ex.printStackTrace(System.err);
} catch (InvalidKeyException ex) {
ex.printStackTrace(System.err);
} catch (NoSuchAlgorithmException ex) {
ex.printStackTrace(System.err);
} catch (NoSuchPaddingException ex) {
ex.printStackTrace(System.err);
} catch (IOException e1) {
e1.printStackTrace(System.err);
} catch (ClassNotFoundException e1) {
e1.printStackTrace(System.err);
}
return true;
}
public boolean download(
String sourceFile, String destFile, UserToken token, HashMap<String, ArrayList<Key>> keys) {
try {
destFile = "." + destFile;
if (sourceFile.charAt(0) == '/') {
sourceFile = sourceFile.substring(1);
}
File file = new File(destFile);
if (!file.exists()) {
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
Envelope env = new Envelope("DOWNLOADF"); // Success
env.addObject(sourceFile);
env.addObject(token);
String concat =
sourceFile
+ token.toString()
+ "DOWNLOADF"
+ nonce; // concatinates all of the objects in envelope
byte[] hasharray = concat.getBytes(); // turn the concat into a byte array
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
String stringhash =
new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
env.addObject(stringhash);
env.addObject(nonce);
nonce++;
byte[] envBytes = Envelope.toByteArray(env);
// Encrypt envelope w/ AES
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
byte[] cipherBytes = cipher.doFinal(envBytes);
output.writeObject(cipherBytes); // here in download
byte[] responseCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher.init(Cipher.DECRYPT_MODE, AESkey);
byte[] responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
ShareFile sf = (ShareFile) env.getObjContents().get(2);
int keyNum = sf.getKeyNum();
ArrayList<Key> groupKeys = keys.get(sf.getGroup());
Key key = groupKeys.get(keyNum);
byte[] initialVector = sf.getIV();
IvParameterSpec ivs = new IvParameterSpec(initialVector);
byte[] decryptBuf = new byte[1024];
while (env.getMessage().compareTo("CHUNK") == 0
&& (Integer) env.getObjContents().get(4) == nonce) {
String hash = (String) env.getObjContents().get(3);
concat =
(Integer) env.getObjContents().get(1)
+ env.getMessage()
+ nonce; // reconstructs the hash
System.out.println("Concat:" + concat);
hasharray = concat.getBytes();
mac = Mac.getInstance("HmacSHA1");
File HASHfile = new File("FHASHKey.bin");
FileInputStream fis = new FileInputStream(HASHfile);
ObjectInputStream ois = new ObjectInputStream(fis);
HMACkey = (Key) ois.readObject();
mac.init(HMACkey);
mac.update(hasharray);
String newhash = new String(mac.doFinal(), "UTF8");
nonce++;
// check hashes for equality
if (hash.equals(newhash) != true) {
System.out.println("HASH EQUALITY FAIL1");
disconnect();
return false;
} else {
decryptBuf = new byte[1024];
System.out.println("env.getMessage: " + env.getMessage());
cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, key, ivs);
decryptBuf = cipher.doFinal((byte[]) env.getObjContents().get(0));
// Write encrypted file to disk
fos.write(decryptBuf);
System.out.printf(".");
env = new Envelope("DOWNLOADF"); // Success
concat = env.getMessage() + nonce; // concatinates all of the objects in envelope
hasharray = concat.getBytes(); // turn the concat into a byte array
mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
stringhash =
new String(
mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
env.addObject(stringhash);
env.addObject(nonce);
nonce++;
envBytes = Envelope.toByteArray(env);
// Encrypt envelope w/ AES
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
cipherBytes = cipher.doFinal(envBytes);
output.writeObject(cipherBytes);
responseCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher.init(Cipher.DECRYPT_MODE, AESkey);
responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
}
}
fos.close();
if (env.getMessage().compareTo("EOF") == 0
&& (Integer) env.getObjContents().get(1) == nonce) {
String hash = (String) env.getObjContents().get(0);
concat = env.getMessage() + nonce; // reconstructs the hash
hasharray = concat.getBytes();
mac = Mac.getInstance("HmacSHA1");
File HASHfile = new File("FHASHKey.bin");
FileInputStream fis = new FileInputStream(HASHfile);
ObjectInputStream ois = new ObjectInputStream(fis);
HMACkey = (Key) ois.readObject();
mac.init(HMACkey);
mac.update(hasharray);
String newhash = new String(mac.doFinal(), "UTF8");
if (hash.equals(newhash) != true) // check hashes for equality
{
System.out.println("HASH EQUALITY FAIL2");
disconnect();
}
fos.close();
System.out.printf("\nTransfer successful file %s\n", sourceFile);
nonce++;
env = new Envelope("OK"); // Success
concat = env.getMessage() + nonce; // concatinates all of the objects in envelope
hasharray = concat.getBytes(); // turn the concat into a byte array
mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
stringhash =
new String(
mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
env.addObject(stringhash);
env.addObject(nonce);
nonce++;
envBytes = Envelope.toByteArray(env);
// Encrypt envelope w/ AES
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
cipherBytes = cipher.doFinal(envBytes);
output.writeObject(cipherBytes);
} else if ((Integer) env.getObjContents().get(1) != nonce) {
System.out.println("Nonce FAIL DOWNLOADF");
disconnect();
return false;
} else {
System.out.printf("Error reading file %s (%s)\n", sourceFile, env.getMessage());
file.delete();
return false;
}
} else {
System.out.printf("Error couldn't create file %s\n", destFile);
return false;
}
} catch (InvalidAlgorithmParameterException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalBlockSizeException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
System.out.println(1);
} catch (BadPaddingException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
System.out.println(2);
} catch (InvalidKeyException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
System.out.println(3);
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
System.out.println(4);
} catch (NoSuchPaddingException ex) {
Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
System.out.println(5);
} catch (IOException e1) {
System.out.printf("Error couldn't create file %s\n", destFile);
return false;
} catch (ClassNotFoundException e1) {
e1.printStackTrace(System.err);
}
return true;
}
public boolean sendToken(UserToken token) {
try {
Envelope env = new Envelope("SENDT"); // Success
env.addObject(token);
String concat =
token.toString() + "SENDT" + nonce; // concatinates all of the objects in envelope
byte[] hasharray = concat.getBytes(); // turn the concat into a byte array
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(HMACkey);
mac.update(hasharray);
String stringhash =
new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
env.addObject(stringhash);
env.addObject(nonce);
nonce++;
byte[] envBytes = Envelope.toByteArray(env);
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, AESkey);
byte[] cipherBytes = cipher.doFinal(envBytes);
output.writeObject(cipherBytes);
// receive from thread
byte[] responseCipherBytes = (byte[]) input.readObject();
// Decrypt response
cipher.init(Cipher.DECRYPT_MODE, AESkey);
byte[] responseBytes = cipher.doFinal(responseCipherBytes);
env = Envelope.getEnvelopefromBytes(responseBytes);
if ((Integer) env.getObjContents().get(1) == nonce) {
String hash = (String) env.getObjContents().get(0);
concat = "OK" + nonce; // reconstructs the hash
hasharray = concat.getBytes();
mac = Mac.getInstance("HmacSHA1");
File HASHfile = new File("FHASHKey.bin");
FileInputStream fis = new FileInputStream(HASHfile);
ObjectInputStream ois = new ObjectInputStream(fis);
Key HMACkey = (Key) ois.readObject();
mac.init(HMACkey);
mac.update(hasharray);
String newhash = new String(mac.doFinal(), "UTF8");
nonce++;
// check hashes for equality
if (hash.equals(newhash) != true) {
System.out.println("HASH EQUALITY FAIL");
return false;
}
if (env.getMessage().compareTo("OK") == 0) {
System.out.printf("OK RECEIVED");
return true;
} else {
System.out.printf("FAILURE");
return false;
}
}
} catch (Exception e) {
System.out.println(e);
}
return false;
}