asdf2014 opened a new pull request #2047:
URL: https://github.com/apache/iotdb/pull/2047


   FYI, the benchmark results of these digest algorithms from 
https://automationrhapsody.com/md5-sha-1-sha-256-sha-512-speed-performance/ .
   
   | Hash    | Case 1 (ms) | Case 2 (ms) | Case 3 (ms) | Case 4 (ms) | Case 5 
(ms) | Case 6 (ms) |
   | ------- | ----------- | ----------- | ----------- | ----------- | 
----------- | ----------- |
   | MD5     | 627.4       | 765.6       | 1488.8      | 839         | 1029.4   
   | 1738.2      |
   | SHA-1   | 604         | 748.2       | 1325        | 916.8       | 1009.6   
   | 1632.4      |
   | SHA-256 | 737.8       | 851         | 1504.4      | 1168.2      | 1260     
   | 1963.6      |
   | SHA-512 | 1056.4      | 1158.8      | 1837.4      | 1118.4      | 1227.4   
   | 1923        |
   
   The collision probability of `MD5` is too high, `SHA1` has been cracked by 
Google, and `SHA-512` is the most time-consuming. Therefore, SHA-256 is the 
best choice.


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