[FEATURE] CryptoHelper

LauncherCore/src/main/java/pro/gravit/utils/helper/CryptoHelper.java

@@ -0,0 +1,54 @@
+package pro.gravit.utils.helper;
+
+import java.util.Objects;
+import java.util.function.LongSupplier;
+
+public final class CryptoHelper {
+	public static byte[] encode(byte[] txt, String pKey) {
+		Objects.requireNonNull(txt);
+		Objects.requireNonNull(pKey);
+        byte[] key = SecurityHelper.fromHex(pKey);
+        byte[] res = new byte[txt.length];
+        for (int i = 0; i < txt.length; i++)
+            res[i] = (byte) (txt[i] ^ key[i % key.length]);
+        return res;
+    }
+
+	public static byte[] decode(byte[] pText, String pKey) {
+		Objects.requireNonNull(pText);
+		Objects.requireNonNull(pKey);
+		byte[] res = new byte[pText.length];
+		byte[] key = SecurityHelper.fromHex(pKey);
+		for (int i = 0; i < pText.length; i++)
+			res[i] = (byte) (pText[i] ^ key[i % key.length]);
+		return res;
+	}
+
+	public static String randomToken(int depth) {
+		VerifyHelper.verifyInt(depth, VerifyHelper.POSITIVE, "Depth must be positive");
+		StringBuilder sb = new StringBuilder(SecurityHelper.TOKEN_STRING_LENGTH*depth);
+		for (int i = 0; i < depth; i++)
+			sb.append(SecurityHelper.randomStringToken());
+		return sb.toString();
+	}
+
+	private CryptoHelper() {
+	}
+	
+	public static class StaticRandom implements LongSupplier {
+		private volatile long rnd;
+
+		public StaticRandom(long rnd) {
+			this.rnd = rnd;
+		}
+
+		@Override
+		public long getAsLong() {
+			this.rnd ^= (this.rnd << 21); 
+			this.rnd ^= (this.rnd >>> 35); 
+			this.rnd ^= (this.rnd << 4); 
+			return this.rnd;
+		}
+	}
+
+}

LauncherCore/src/main/java/pro/gravit/utils/helper/SecurityHelper.java

@@ -485,7 +485,7 @@ public static byte[] decrypt(String seed, byte[] encrypted) throws Exception {
         return decrypt(getRawKey(seed.getBytes()), encrypted);
     }
 
-    public static byte[] HexToByte(String hexString) {
+    public static byte[] fromHex(String hexString) {
         int len = hexString.length() / 2;
         byte[] result = new byte[len];
         for (int i = 0; i < len; i++) {