public String decHashValue(String Cipher_Chosen, String hashValue) {
// System.out.println("Decrypting hash message --" + hashValue);
String decHashValue = null;
if (Cipher_Chosen.equalsIgnoreCase("rc4")) {
RC4 rc4 = new RC4(new String(key1));
byte[] cipher = hashValue.getBytes();
byte[] deText = rc4.decrypt(cipher);
decHashValue = new String(deText);
} else if (Cipher_Chosen.equalsIgnoreCase("cbc")) {
CBC cbc = new CBC(key1, key2);
byte[] enText = hashValue.getBytes();
decHashValue = cbc.decrypt(enText);
} else if (Cipher_Chosen.equalsIgnoreCase("pcbc")) {
PCBC pcbc = new PCBC(key1, key2);
byte[] enText = hashValue.getBytes();
decHashValue = pcbc.decrypt(enText);
} else if (Cipher_Chosen.equalsIgnoreCase("cfb")) {
// Cipher chosen is CFB
CFB cfb = new CFB(key1, key2);
byte[] enText = hashValue.getBytes();
decHashValue = cfb.decrypt(enText);
}
return decHashValue;
}
public String encHashValue(String Cipher_Chosen, String hashValue) {
// System.out.println("Encrypting hash message --" + hashValue);
String encHashValue = null;
if (Cipher_Chosen.equalsIgnoreCase("rc4")) {
RC4 rc4 = new RC4(new String(key1));
byte[] plain = hashValue.getBytes();
byte[] eText = rc4.encrypt(plain);
encHashValue = new String(eText);
} else if (Cipher_Chosen.equalsIgnoreCase("cbc")) {
CBC cbc = new CBC(key1, key2);
byte[] eText = cbc.encrypt(hashValue);
encHashValue = new String(eText);
} else if (Cipher_Chosen.equalsIgnoreCase("pcbc")) {
PCBC pcbc = new PCBC(key1, key2);
byte[] eText = pcbc.encrypt(hashValue);
encHashValue = new String(eText);
} else if (Cipher_Chosen.equalsIgnoreCase("cfb")) {
// Cipher chosen is CFB
CFB cfb = new CFB(key1, key2);
byte[] eText = cfb.encrypt(hashValue);
encHashValue = new String(eText);
}
return encHashValue;
}
public void sendData(
String fileName, CFB cfb, InputStream sockIn, OutputStream sockOut, boolean eve, int action) {
DataOutputStream dout;
BufferedReader brin;
try {
dout = new DataOutputStream(sockOut);
brin = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));
String line;
byte[] enText;
while ((line = brin.readLine()) != null) {
if (line.equalsIgnoreCase("")) {
continue;
}
enText = cfb.encrypt(line);
// Evesdropper action
switch (action) {
case 0:
break;
case 1:
int len1 = enText.length;
if (len1 >= 8) {
for (int i = 0; i < 8; i++) {
enText[i] = (byte) (i + 3 % 256);
}
}
break;
case 2:
int len2 = enText.length;
if (len2 > 8) {
byte[] remove = new byte[len2 - 8];
System.arraycopy(enText, 8, enText, 0, len2 - 8);
enText = remove;
}
break;
case 3:
int len3 = enText.length;
byte[] add = new byte[len3 + 8];
byte[] dump = new byte[8];
for (int i = 0; i < 8; i++) {
dump[i] = (byte) (i + 3 % 256);
}
System.arraycopy(dump, 0, add, 0, 8);
System.arraycopy(enText, 0, add, 8, len3);
break;
default:
break;
}
dout.writeInt(enText.length);
dout.write(enText);
System.out.println(line);
System.out.println(new String(enText));
}
dout.close();
brin.close();
} catch (FileNotFoundException fnfe) {
System.out.println("*******File not found*****");
} catch (Exception e) {
e.printStackTrace();
}
}