code: protected String getAuthorizationCodeString(byte[] verifierBytes) {
  		char[] chars = new char[verifierBytes.length];
  		for (int i = 0; i < verifierBytes.length; i++) {
  			chars[i] = DEFAULT_CODEC[((verifierBytes[i] & 0xFF) % DEFAULT_CODEC.length)];
  		}
  		return new String(chars);
  	}
docs: Convert these random bytes to a verifier string. The length of the byte array can be
  {@link #setLength(int) configured}. The default implementation mods the bytes to fit into the
  ASCII letters 1-9, A-Z, a-z .
  
  @param verifierBytes The bytes.
  @return The string.