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I am adding security to my web service and chose to sign the Timestamp and Token.
While reading docs I found a lot of examples where they sign the Body of the SOAP message.
My question is: what is best to sign?
From what I understand signing the Body could lead to performance issues if the Body is pretty large.
Thanks.
You should definitely sign the whole message body.
XMLDSIG is performed on the digests of referenced parts defined in <SignedInfo>. Running a hash algorithm like SHA1 through a large body takes very little time compared with the PKI operations. You shouldn’t worry about performance.