sign xml string java

how can i encrypt/decrypt string with cer file and private key in java do the cer开发者_开发百科tificate need to be in special format?

Abdul Khaliq

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You are probably looking for implementation of XMLEnc specification. Try XMLSec.

BTW you need to distinguish signing and encrypting operations. These are different standards (XMLDSig and XMLEnc), [partially] different technologies and often different libraries.

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The bouncy castle web site is a place to start.