On 22.04.2014 21:10, Nick Burch wrote:

Any chance you chould check what Java version we required at the time we added 
the RC4 support, and compare that to which Java version introduced RC4 support 
via JCE?



The JCE was introduced with JDK 1.4 (starting from 2002).
The check-in was 2009 as part of the 3.5 release.
I haven't found any explicit comments in the changes file, as of when which 
minimum-version of the jdk was supported.
I thought, I could reason about the jdk version based on xml-beans support, but 
this is also not so clear.

So in the end, I guess it's ok, to replace it.
Pro: use of standard library
Con: maybe a performance hit, but if performance would be an issue, it would 
make anyway more sense to replace the byte-wise calls with block-wise 
invocations

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