I am facing a issue with validating the xml signature. I have enveloped
transform followed by ex-C14N. I did search xmlsec mail archive but to
no success. Then I tried with debugging the xmlsec src code:
The Reference object loops through all the configured transforms, the
http://www.w3.org/2000/09/xmldsig#enveloped-signature
transform returns a (modified, i assume) XMLSignatureInput, then we
run through the C14N and it returns null!
The block of code is in CanonicalizerBase.java in method
engineCanonicalizeXPathNodeSetInternal.
this.canonicalizeXPathNodeSet(doc,doc);
System.out.println("canonicalizeXPathNodeSet is ok i
guess...");
this._writer.close();
if (this._writer instanceof ByteArrayOutputStream) {
byte []
sol=((ByteArrayOutputStream)this._writer).toByteArray();
if (reset) {
((ByteArrayOutputStream)this._writer).reset();
}
return sol;
} else if (this._writer instanceof
UnsyncByteArrayOutputStream) {
byte
[]result=((UnsyncByteArrayOutputStream)this._writer).toByteArray();
if (reset) {
((UnsyncByteArrayOutputStream)this._writer).reset();
}
return result;
}
return null; <------ returns this null!
The _writer instance in this case was created in Reference.java method
calculateDigest. Thus the ByteArrayOutputStreams of CanonicalizeBase do not
match with the BufferedOutputStreams of Reference class, causing it to return
null.
MessageDigestAlgorithm mda = this.getMessageDigestAlgorithm();
mda.reset();
DigesterOutputStream diOs=new DigesterOutputStream(mda);
OutputStream os=new UnsyncBufferedOutputStream(diOs); <---
not check via instanceof in CanonicalizerBase
XMLSignatureInput
output=this.dereferenceURIandPerformTransforms(os);
output.updateOutputStream(os);
os.flush();
Pls help me in resolving this. The signedInfo element is this:
<ds:SignedInfo>
<ds:CanonicalizationMethod
Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
<ds:SignatureMethod
Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<ds:Reference URI="#id-23761097">
<ds:Transforms>
<ds:Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
<ds:Transform
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
</ds:Transforms>
<ds:DigestMethod
Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<ds:DigestValue>SVUf+cO2NKZpSOHHhPfQjLQNhiE=</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
