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https://issues.apache.org/jira/browse/CODEC-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18098882#comment-18098882
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Gary D. Gregory commented on CODEC-245:
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Should we close this ticket or is there work to do here?
> RegEx for verifying salts in ShaCrypt is incorrect
> --------------------------------------------------
>
> Key: CODEC-245
> URL: https://issues.apache.org/jira/browse/CODEC-245
> Project: Commons Codec
> Issue Type: Bug
> Affects Versions: 1.11
> Reporter: Simon Levermann
> Priority: Major
>
> The regex/code that extracts the salt from a given salt string in Sha2Crypt
> treats some invalid salt formats as valid:
> {code:java}
> ^\$([56])\$(rounds=(\d+)\$)?([\.\/a-zA-Z0-9]{1,16}).*
> {code}
> The code then goes on to use capture group 3 (the round count) to determine
> how many rounds are used, and capture group 4 (the actual salt) to use as
> salt data.
> However, for an input that contains an invalid salt specification like this:
> {code:java}
> $5$notrounds=1000$asdfasdf
> {code}
> This string is treated as valid. The operation then uses "notrounds" as the
> salt for hashing:
> {code:java}
> System.out.println(Sha2Crypt.sha256Crypt(new byte[100],
> "$5$notrounds=1000$asdfasdf"));
> {code}
> The above code prints
> {code:java}
> $5$notrounds$aAEx6EzUBfc.aIIeiItVjUREbj/ar4xlb/qcMxD90NA
> {code}
> This code should probably throw an exception. Additionally, other invalid
> salt strings like
>
> {code:java}
> $6$rounds=1000$äöüäöü
> {code}
> Result in hashes like:
> {code:java}
> $5$rounds$ZIRdMgi25kK5Zmi1whKjcnFN/Pe8QCAOlTmxMfwAoq5
> {code}
> Completely ignoring the rounds parameter, and using the literal string
> "rounds" as the salt for hashing.
>
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