Create ByteArrayWrapper from hex string

modUtil/src/main/java/org/aion/util/types/ByteArrayWrapper.java

@@ -2,6 +2,7 @@
 
 import java.util.Arrays;
 import java.util.Objects;
+import org.aion.util.conversions.Hex;
 
 /**
  * Immutable class used to wrap byte arrays for use in scenarios where value-based equality needs to
@@ -31,6 +32,23 @@ public static ByteArrayWrapper wrap(byte[] bytes) {
         return new ByteArrayWrapper(bytes);
     }
 
+    /**
+     * Returns a wrapper for the given hex string.
+     *
+     * @param hexString non-{@code null} string of hex characters to be wrapped
+     * @return a wrapper for the given hex string
+     * @throws NullPointerException if the given string is null
+     */
+    public static ByteArrayWrapper fromHex(String hexString) {
+        Objects.requireNonNull(hexString, "The given string must not be null.");
+
+        String data = hexString.startsWith("0x") ? hexString.substring(2) : hexString;
+        if ((data.length() & 1) == 1) {
+            data = "0" + data;
+        }
+        return new ByteArrayWrapper(Hex.decode(data));
+    }
+
     /**
      * Returns a copy of the encapsulated byte array.
      *