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https://issues.apache.org/jira/browse/HDFS-15098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17179285#comment-17179285
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liusheng edited comment on HDFS-15098 at 8/18/20, 1:06 AM:
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[~lindongdong] you can check the previous CI results, if we define an unused 
method, CI will be unhappy.  and I still don't know why there is a compatible 
issue,  the method you said will not be used any place, can you please explain 
more ?

The modification of 
[OpensslSecureRandom.c|https://github.com/apache/hadoop/pull/2211/files#diff-3ee504e8c2a27c840c39c4496a27cc02]
 I think is to make OpenSSL interface to support SM4, such as check of the 
OpenSSL version(SM4 feature require OpenSSL>=1.1.1).


was (Author: seanlau):
[~lindongdong] you can check the previous CI results, if we define an unused 
method, CI will be unhappy.  and I still don't know why there is a compatible 
issue,  the method you said will not be used any place, can you please explain 
more ?

The modification of 
[OpensslSecureRandom.c|https://github.com/apache/hadoop/pull/2211/files#diff-3ee504e8c2a27c840c39c4496a27cc02]
 I think is to make OpenSSL interface to support SM4, such as check of the 
OpenSSL version(SM4 feature require ). it is 

> Add SM4 encryption method for HDFS
> ----------------------------------
>
>                 Key: HDFS-15098
>                 URL: https://issues.apache.org/jira/browse/HDFS-15098
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 3.4.0
>            Reporter: liusheng
>            Assignee: liusheng
>            Priority: Major
>              Labels: sm4
>         Attachments: HDFS-15098.001.patch, HDFS-15098.002.patch, 
> HDFS-15098.003.patch, HDFS-15098.004.patch, HDFS-15098.005.patch, 
> HDFS-15098.006.patch, HDFS-15098.007.patch, HDFS-15098.008.patch, 
> HDFS-15098.009.patch
>
>
> SM4 (formerly SMS4)is a block cipher used in the Chinese National Standard 
> for Wireless LAN WAPI (Wired Authentication and Privacy Infrastructure).
>  SM4 was a cipher proposed to for the IEEE 802.11i standard, but has so far 
> been rejected by ISO. One of the reasons for the rejection has been 
> opposition to the WAPI fast-track proposal by the IEEE. please see:
> [https://en.wikipedia.org/wiki/SM4_(cipher)]
>  
> *Use sm4 on hdfs as follows:*
> 1.Configure Hadoop KMS
>  2.test HDFS sm4
>  hadoop key create key1 -cipher 'SM4/CTR/NoPadding'
>  hdfs dfs -mkdir /benchmarks
>  hdfs crypto -createZone -keyName key1 -path /benchmarks
> *requires:*
>  1.openssl version >=1.1.1



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