Create rxIXaw.java

INTCGz/rxIXaw.java

@@ -0,0 +1,126 @@
+import javax.crypto.Cipher;
+import javax.crypto.CipherSpi;
+import javax.crypto.NoSuchPaddingException;
+import java.security.*;
+import java.security.spec.AlgorithmParameterSpec;
+
+// Custom XOR Cipher
+class XORCipher extends CipherSpi {
+    private byte[] keyBytes;
+
+    @Override
+    protected void engineSetMode(String mode) throws NoSuchAlgorithmException {
+        // Do nothing (we don't support different modes)
+    }
+
+    @Override
+    protected void engineSetPadding(String padding) throws NoSuchPaddingException {
+        // Do nothing (we don't support padding)
+    }
+
+    @Override
+    protected int engineGetBlockSize() {
+        return 0;  // Stream cipher
+    }
+
+    @Override
+    protected int engineGetOutputSize(int inputLen) {
+        return inputLen;
+    }
+
+    @Override
+    protected byte[] engineGetIV() {
+        return null;
+    }
+
+    @Override
+    protected AlgorithmParameters engineGetParameters() {
+        return null;
+    }
+
+    @Override
+    protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException {
+        keyBytes = key.getEncoded();
+    }
+
+    @Override
+    protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
+        engineInit(opmode, key, random);
+    }
+
+    @Override
+    protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
+        engineInit(opmode, key, random);
+    }
+
+    @Override
+    protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) {
+        byte[] output = new byte[inputLen];
+        for (int i = 0; i < inputLen; i++) {
+            output[i] = (byte) (input[i + inputOffset] ^ keyBytes[i % keyBytes.length]);
+        }
+        return output;
+    }
+
+    @Override
+    protected int engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws ShortBufferException {
+        byte[] result = engineUpdate(input, inputOffset, inputLen);
+        System.arraycopy(result, 0, output, outputOffset, result.length);
+        return result.length;
+    }
+
+    @Override
+    protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen) {
+        return engineUpdate(input, inputOffset, inputLen);
+    }
+
+    @Override
+    protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws ShortBufferException {
+        return engineUpdate(input, inputOffset, inputLen, output, outputOffset);
+    }
+}
+
+// XOR Key
+class XORKey implements Key {
+    private final byte[] keyBytes;
+
+    public XORKey(byte[] keyBytes) {
+        this.keyBytes = keyBytes;
+    }
+
+    @Override
+    public String getAlgorithm() {
+        return "XOR";
+    }
+
+    @Override
+    public String getFormat() {
+        return "RAW";
+    }
+
+    @Override
+    public byte[] getEncoded() {
+        return keyBytes;
+    }
+}
+
+// Testing the XOR Cipher
+public class CustomCryptoExample {
+    public static void main(String[] args) throws Exception {
+        byte[] keyData = "12345678".getBytes();  // Example key
+        XORKey key = new XORKey(keyData);
+
+        Cipher cipher = Cipher.getInstance("XOR");
+        cipher.init(Cipher.ENCRYPT_MODE, key);
+
+        byte[] plaintext = "Hello, World!".getBytes();
+        byte[] ciphertext = cipher.doFinal(plaintext);
+
+        System.out.println(new String(ciphertext));  // Prints scrambled text
+
+        cipher.init(Cipher.DECRYPT_MODE, key);
+        byte[] decryptedText = cipher.doFinal(ciphertext);
+
+        System.out.println(new String(decryptedText));  // Should print "Hello, World!"
+    }
+}