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https://issues.apache.org/jira/browse/SOLR-13238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915105#comment-16915105
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Noble Paul commented on SOLR-13238:
-----------------------------------
LGTM
> BlobHandler generates non-padded md5
> ------------------------------------
>
> Key: SOLR-13238
> URL: https://issues.apache.org/jira/browse/SOLR-13238
> Project: Solr
> Issue Type: Bug
> Components: blobstore
> Affects Versions: 6.0, 6.6.5, 7.0, 7.6, 7.7
> Reporter: Jeff Walraven
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Introduced in SOLR-6787
> The blob handler currently uses the following logic for generating/storing
> the md5 for uploads:
> {code:java}
> MessageDigest m = MessageDigest.getInstance("MD5");
> m.update(payload.array(), payload.position(), payload.limit());
> String md5 = new BigInteger(1, m.digest()).toString(16);
> {code}
> Unfortunately, this method does not provide padding for any md5 with less
> than 0x10 for its most significant byte. This means that on many occasions it
> could end up with a md5 hash of 31 characters instead of 32.
> I have opened a PR with the following recommended change:
> {code:java}
> String md5 = new String(Hex.encodeHex(m.digest()));
> {code}
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