void sha256_get(uint8_t hash[32], const uint8_t *message, int length);/*此函数用于对消息计算摘要值，输入任意大小消息，输出32字节摘要值*/ void hmac_sha256_get(uint8_t digest[32], uint8_t *message, int message_length, uint8_t *key, int key_length);/*此函数用于HMAC_SHA256加密，秘钥任意长度，输出32字节*/