i have to encrypt the xml file using asymmetric cyper....

 in one class , i am generating private key and public key using "RSA" algorithm..using 1024 byte initialization...
it is generating properly...

and after that in second class i am encrypting the xml file using "DESede" algorithm and i am using public key of above class..
but i am getting exceptione :

java.security.InvalidKeyException: Invalid key length: 162 bytes
        at com.sun.crypto.provider.DESedeCipher.engineGetKeyS ize(DashoA6275)
        at javax.crypto.Cipher.init(DashoA6275)
        at XmlEncryption.getEncryptedData(XmlEncryption.java: 147)
        at XmlEncryption.encryptCompleteXmlFile(XmlEncryption .java:123)
        at demoXmlEncApp.simulateBookSellersEnd(demoXmlEncApp .java:72)
        at demoXmlEncApp.main(demoXmlEncApp.java:29)

so, what is that ?

i want to use RSA algo for key generatiion and DESede for cipher initialization .

is there any site for where source code of xml file encryption using asymmetric cipher is available?

pls, help me.....