feat: add crypto

plugin/crypto/pkg/method/aes_ctr.java

@@ -0,0 +1,28 @@
+import javax.crypto.Cipher;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
+
+public class Aes256Ctr {
+
+    public static byte[] decrypt(byte[] ciphertext, byte[] key, byte[] iv) throws Exception {
+        Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
+        SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
+        IvParameterSpec ivSpec = new IvParameterSpec(iv);
+        cipher.init(Cipher.DECRYPT_MODE, secretKey, ivSpec);
+        return cipher.doFinal(ciphertext);
+    }
+
+    public static void main(String[] args) throws Exception {
+
+        int[] intArray = {253, 72, 209, 96, 36};
+        byte[] ciphertext = new byte[intArray.length];
+        for (int i = 0; i < intArray.length; i++) {
+            ciphertext[i] = (byte) intArray[i];
+        }
+//        byte[] ciphertext =  //byte[]{253,72,209,96,36]; // ciphertext to be decrypted
+        byte[] key = "01234567012345670123456701234567".getBytes();// 256-bit key
+        byte[] iv = "0123456701234567".getBytes();// initialization vector
+        byte[] plaintext = decrypt(ciphertext, key, iv);
+        System.out.println(new String(plaintext, "UTF-8"));
+    }
+}