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https://issues.apache.org/jira/browse/CODEC-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781278#action_12781278
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Gary Gregory commented on CODEC-91:
-----------------------------------
The old behavior was a bug I think.
>From the spec http://tools.ietf.org/html/rfc2045#section-6.8:
{quote}
Because it is used only for padding at the end of the data, the
occurrence of any "=" characters may be taken as evidence that the
end of the data has been reached (without truncation in transit).
{quote}
> Handling of embedded padding in base64 encoded data changed in 1.4
> ------------------------------------------------------------------
>
> Key: CODEC-91
> URL: https://issues.apache.org/jira/browse/CODEC-91
> Project: Commons Codec
> Issue Type: Bug
> Affects Versions: 1.4
> Reporter: Chris Pimlott
>
> 1.4 changed the way that embedded padding characters (i.e. "=") were handled
> when decoding base64 data. Previously, the decoder ignored them and decoded
> all the data. Now it stops upon encountering the first padding byte. This
> breaks compatibility with previous versions.
> For example, in 1.4,
> b64.decode("Y29tbW9ucwo=".getBytes());
> gives the same result as
> b64.decode("Y29tbW9ucwo=Y29tbW9ucwo=".getBytes());
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