Hi All,
I am trying to figure out the way to calculate the <DigestValue> in <Reference> tag. I went through the link http://www.w3.org/2000/09/xmldsig# <http://www.w3.org/2000/09/xmldsig> and my findings are as below as per this document: For each <Reference> in the <Signature> calculate the <DigestValue> value by:- 1. Extract the portion of the document indicated in the <Reference>. 2. Canonicalize <mk:@MSITStore:E:\Shyam\Proserv%20Projects\Project%20Documents\UK_Gov\Portal %20Pack2\Gateway%20Portal%20Pack%204.1.0.1%20Documentation.chm::/HTML/Concep ts/Canonicalization.html> the extract. 3. Run the digest method referred to in <DigestMethod> over the canonicalized extract (in this case the SHA1 digest). 4. Convert the binary digest to Base-64 and insert into <DigestValue> My question is not about how the digest is calculated, but on what. For example, <Header> <Signature xmlns="http://www.w3.org/2000/09/xmldsig#";> <SignedInfo> <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"; /> <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"; /> <Reference URI="#Body"> <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"; /> <DigestValue /> </Reference> </SignedInfo> <SignatureValue /> <KeyInfo> <X509Data> <X509Certificate /> </X509Data> </KeyInfo> </Signature> </Header> <Body Id="Body"> <Timestamp>2006-May-04 20:16:21</Timestamp> </Body> So as per the rule, results at each step are: 1- <Body Id="Body"> <Timestamp>2006-May-04 20:16:21</Timestamp> </Body> 2- <Body Id="Body"><Timestamp>2006-May-04 20:16:21</Timestamp></Body> 3- The SHA1 on the data of step2 4- hI2M81Ns4JNPVeHVlBaxOtu8HPY= I get "hI2M81Ns4JNPVeHVlBaxOtu8HPY=" as a DigestValue which is different than the expected one, which is "pV9SUz/WktNbDo+R4dW9MBuWDgs=". Can anyone please tell me what is the data here (point 1) on which the digest is calculated? Best Regards, Shyam Shukla DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Persistent Systems Pvt. Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Pvt. Ltd. does not accept any liability for virus infected mails.
