---
title: 创建Digest context
description: "参照创建Digest context，仅增加回调函数的设置，用于任务完成后，poll线程进行调用。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengboostkithistory/252RC1/accel/kunpengaccel_17_0090.html
sourcePath: /source/zh/kunpengboostkithistory/252RC1/accel/kunpengaccel_17_0090.html
indexId: 3a81d0f14d2d8bb9231beab4f95c20d444533fe1028d0628aa7484256a87ccb972
---
# 创建Digest context

参照创建Digest context，仅增加回调函数的设置，用于任务完成后，poll线程进行调用。

```
static void _digest_cb(void *message, void *digest_tag)
{
struct digest_async_tag *tag = digest_tag;
 void *ctx = tag->ctx;
 int thread_id = tag->thread_id;
 int cnt = tag->cnt;
struct wcrypto_digest_msg *msg = message;
if (msg->status = WD_SUCCESS)
printf("thread %d do digest %dth time success!\n", thread_id, cnt);
else
printf("thread %d do RSA %dth time fail(status=%d)!\n", thread_id, cnt, 
msg->status);
free(digest_tag);
}
setup.cb = (void *)_digest_cb;
……
```