How to apply XML signature

Hello.
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          $P G\æ&"ùO]ó]0
  *†H†÷
     0h1%0#  U    DigiSign Qualified Public CA1 0   U    DigiSign Public CA1 0   U
  DigiSign S.A1 0   U    RO0 
140722065817Z
150722065817Z0Œ1 0   U    RO1 0   U    PIATRA NEAMT1 0
  U    STERPU1 0   U *  ELENA1 0   U    200506245SE1961 0   U )  STERPU ELENA1 0   U    STERPU ELENA0‚ "0
  *†H†÷
      ‚   0‚
‚   ¯Æüÿ›ÿewVˆœ‰Ã|Û#šÜŸ$ Ï„ A _Šôí襓ֱþ‹“ÁtЦ m ÊùX/:¥¸wž ŽýÌ äñÉ&
˜þõØV—™àžM¼óèµ ñd¥@Ô{_t3 °÷ãôgX 2®2AÞ? „öwÅMU#š Ö(d\ù}Îÿ Ë| ÉRV9Û´ ç“ LÐ{{þŸÞtÏÃz
«bOD /{E œÀ  HÖ òË¥ÄÓ½Ý Dîr¢ ‹òOÉ ¨: V- ò§·r‚v  J8¯bi` „dÕ›c' où´§ 1Ê,4àÞÒç4ês€  ø5Ì Þ ¡C~¿Î(   ø :a     £‚ Í0‚ É08  +        ,0*0(  +     0 † http://ocsp.digisign.ro/ocsp0   U       Íf¡Ì+@G¸Î}>ö“œnÕš 0   U    ÿ  0 0   U #  0 € z4Í)âQ – s" €I"ցº©Ò0.  +        "0 0
  +       0     ŽF  0     ŽF  0D  U   =0;09  +    ‚‹m   0*0(  +         http://www.digisign.ro/cppv20D  U   =0;09 7 5†3http://crl.digisign.ro/qualifiedpublicca/latest.crl0   U    ÿ     ð08  U %  ÿ .0,  +         +       
+    ‚7   
+    ‚7
  09  U   200 [email protected]  
+    ‚7       [email protected]
  *†H†÷
      ‚   PâñÔæµB¡× aD 8 Àx‘\ cî[õ 2êò,ËJú ÞíÖ÷ ¦:—5®Så žÃ.y„)öÙ©Â7í  Õ)¾U"* ýŠ}³HúÍ{hÚñã ä¶| •59€>F£H»…¬œ÷â ùë \¡TMa]õŒŠ ò(Ø C Hpm×z£   i=ådr
¹ ±ëg –\ ¥  4͏G²Îš"v N uŸ¥Ââõu gÙ  »> z«G} ym¢’Z€+
xÊÊ:f| A$R\…j¦ 5 ¦Ö¼Ì=¨a¿j~ ,ãLK Í  ˜v YË!ôª 3(qõ§B¾   ãK0„M¹ Ë Ý¿ ü8ý õ`x?×2Õį9ù¸€ ²Róá¬Íðƒ ¼ß â”`z¬ ׸’î Ø
XÆ¡-ú¬‹ ÊQwš Ì« õ¹E5 >vL|¢*á [Ê  nÂjÝä¥-To\ø›d…ÃÛóà ¤j9 ¸ /ƒ’  c.‹  £uÓ B´   FLp Q8¨i¾¥*c<W䂲/(VPVWmÑG ¬‚Ëáû¹Z%¢!HԺސý]Áb  CÖiÈÌl,÷¾yéË‘í   ªXã÷  ۲ᖪ múE2ÅÍÑÝÆ|–Z0saªÎýk®!.])Ù÷ â–#±Â ¸/œ\²7.Ì›´ÅQ ¢ÔŠÖN†Ð—1‚ £0‚ Ÿ   0|0h1%0#  U    DigiSign Qualified Public CA1 0   U    DigiSign Public CA1 0   U
  DigiSign S.A1 0   U    RO     $P G\æ&"ùO]ó]0   +      0
  *†H†÷
      ‚  pãÌ’ûŸà«¶ðô=vjY éí'Ð
¼T! =Ø=Æq닾Xþ®À ¨  7{¬X±Õdïé ¡Nu½£Í“±–n pЗôzG…ÖÙ ÒTî5 Ã
Ï>çYo"ÅqA ±–…Û6¹¹ ,ôD}o¬r>ü<ÖÞ< ‹µTeÙá K÷zÇsõLƒÎkÃ} À$KQßR&ÿ!VõœúûÆÑk(½ É…9šlXÌ•šµÝ± Hy‡ZÙÐD |+ c–Øx @-£  &•È Í4'ù
{ƒ]¤&5't66ÎË”z—g¸>s1"8ǾŸÖfz ø™ v+ÕØžžEېXtUpè–†ŸCˆ>øî
How can I do this in java?
Thank you

read this how to work with cryptography in java:
http://docs.oracle.com/javase/7/docs/technotes/guides/security/crypto/CryptoSpec.html
Concerning your your actual XML file it depends how your XML is defined:
is the signature part of the XML schema?
Which part(s) of the XML should be signed (complete document as a string or certain parts only)?
Will the signature be calculated over the tags and their attributes or their content only? (i.e. does intermediate white space between tags and attributes matter...)
bye
TPD

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