[jira] [Created] (SANTUARIO-393) Performance regression as signature data is not buffered

["Markus Kilås (JIRA)" <ji...@apache.org>]

Markus Kilås created SANTUARIO-393:
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             Summary: Performance regression as signature data is not buffered
                 Key: SANTUARIO-393
                 URL: https://issues.apache.org/jira/browse/SANTUARIO-393
             Project: Santuario
          Issue Type: Bug
          Components: Java
    Affects Versions: Java 1.5.5
            Reporter: Markus Kilås
            Assignee: Colm O hEigeartaigh
             Fix For: Java 1.5.7
         Attachments: xml-security-buffered-signing-markuskilas-1.patch

Note: Only tested on 1.5.5 so affects version might be earlier.

After upgrading from xmlsec (java) 1.4 to 1.5 we saw a significant drop
in signature generation performance especially when using a network
based HSM.

After some investigation it turns out that the problem is that the
hashing is done with one byte at a time which with network latencies
gives the bad performance.

Looking in the code of DOMSignedInfo.java it looks like the code intends
to use an UnsyncBufferedOutputStream however only its close method is
actually called, which as far as I can see won't have any side affect at
all when operated on a ByteArrayOutputStream.

The attached patch resolves the performance issue by actually using the
UnsyncBufferedOutputStream and that way perform the digests on a
possibly full buffer instead of byte by byte. The patch has been tested
on version 1.5.5 but also applies on 1.5.6.




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