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https://issues.apache.org/jira/browse/HIVE-17226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111770#comment-16111770
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Tao Li commented on HIVE-17226:
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[~asherman] I think changing the hash function for GenericUDFMaskHash should
not cause compatibility issues, since there is no expectation/assumption that
the masking result has to be the same. But we should include this change in the
release notes so users are aware of it.
> Use strong hashing as security improvement
> ------------------------------------------
>
> Key: HIVE-17226
> URL: https://issues.apache.org/jira/browse/HIVE-17226
> Project: Hive
> Issue Type: Improvement
> Components: Security
> Reporter: Tao Li
> Assignee: Tao Li
>
> There have been 2 places identified where weak hashing needs to be replaced
> by SHA256.
> 1. CookieSigner.java uses MessageDigest.getInstance("SHA"). Mostly SHA is
> mapped to SHA-1, which is not secure enough according to today's standards.
> We should use SHA-256 instead.
> 2. GenericUDFMaskHash.java uses DigestUtils.md5Hex. MD5 is considered weak
> and should be replaced by DigestUtils.sha256Hex.
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