After encrypting a token sent from JAVA code to Angular using Base64 encryption, the next step is decryption:
String token = "1345BCHCNB";
Cipher ecipher = Cipher.getInstance("AES");
String mykey = "1234567891234567";
SecretKey key = new SecretKeySpec(mykey.getBytes(), "AES");
ecipher.init(Cipher.ENCRYPT_MODE, key);
byte[] utf8 = token.getBytes("UTF-8");
byte[] enc = ecipher.doFinal(utf8);
String enctoken = Base64.encodeBase64(enc).toString());
Decryption on the Angular side is the challenge now. The process of converting back to the original token seems elusive.