How To Apply Electronic Signature To Predefined XML

Oct 4, 2014

I must apply a electronic signature to a predefined XML.
 
File looks like this:

<xml....
<invoice serialCode="NT" serialNumber="123" issueDate="2014-10-01" startDate="2014-09-01" endDate="2014-09-30" orgUnitCode="CAS-NT" providerCode="15107618" providerCategory="PARA" contractNumber="8207" contractType="PAR" contractDate="2014-06-27" totalAmmount="34.81"
 
And at the end there is a sinature that looks like this:
‚ R0‚ N0‚ 6          $P Gæ&"ùO]ó]0
  *†H†÷
0h1%0#  U    DigiSign Qualified Public CA1 0   U    DigiSign Public CA1 0   U
  DigiSign S.A1 0   U    RO0 
140722065817Z

[Code] ....

How can I do this in java?

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