bytesToHex function is changed beecause of required library is depracated on OpenJdk 11

Author: hakan0arslan

ciphers/AESEncryption.java

@@ -8,7 +8,6 @@
 import javax.crypto.KeyGenerator;
 import javax.crypto.NoSuchPaddingException;
 import javax.crypto.SecretKey;
-import javax.xml.bind.DatatypeConverter;
 
 /**
  * This example program shows how AES encryption and decryption can be done in
@@ -19,6 +18,8 @@
  */
 public class AESEncryption {
 
+
+private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
 /**
  * 1. Generate a plain text for encryption 2. Get a secret key (printed in
  * hexadecimal form). In actual use this must by encrypted and kept safe. The
@@ -103,12 +104,22 @@ public static String decryptText(byte[] byteCipherText, SecretKey secKey) throws
 
 /**
  * Convert a binary byte array into readable hex form
- * 
+ * Old library is deprecated on OpenJdk 11 and 
+ * this is faster regarding other solution is using StringBuilder
+ * Credit
+ * {@link 
+ * https://stackoverflow.com/questions/9655181/how-to-convert-a-byte-array-to-a-hex-string-in-java/9855338#9855338}
  * @param hash
  * (in binary)
  * @return hexHash
  */
-private static String bytesToHex(byte[] hash) {
-return DatatypeConverter.printHexBinary(hash);
+public static String bytesToHex(byte[] bytes) {
+ char[] hexChars = new char[bytes.length * 2];
+ for (int j = 0; j < bytes.length; j++) {
+ int v = bytes[j] & 0xFF;
+ hexChars[j * 2] = HEX_ARRAY[v >>> 4];
+ hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
+ }
+ return new String(hexChars);
 }
 }