code: public String encryptHex(String data, KeyType keyType) {
  		return HexUtil.encodeHexStr(encrypt(data, keyType));
  	}
docs: 编码为Hex字符串
  
  @param data 被加密的字符串
  @param keyType 私钥或公钥 {@link KeyType}
  @return Hex字符串
  @since 4.0.1