Client本地加解密，comon

加了缓存加快速度

盐值是UUID

public byte[][] generateKeyGroup(Map<String, String> genMetaData, boolean isKeyEncrypted) throws KeyCenterAlgorithmException {
        UUID uuid = UUID.randomUUID();
        String randomSalt = uuid.toString().trim().replaceAll("-", "");
        byte[][] keyBytes = new byte[1][];
        if (isKeyEncrypted) {
            keyBytes[0] = this.encryptKeyContent(randomSalt.getBytes(), false);
        } else {
            keyBytes[0] = randomSalt.getBytes();
        }

        return keyBytes;
    }

SecurityUtil
/**
     * 生成盐值
     */
    public static String generateSalt(){
        SecureRandom secureRandom = new SecureRandom();
        //与SHA256对应，盐的长度是32个字节的随机数据。
        byte[] bytes = new byte[32];
        secureRandom.nextBytes(bytes);
        return new BASE64Encoder().encode(bytes);
    }