Código:
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod
Algorithm="http://www.w3.org/TR/2000/WD-xml-c14n-20001011" />
<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
<Reference URI="http://www.foo.com/securePage.html">
<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
<DigestValue>60NvZvtdTB+7UnlLp/H24p7h4bs=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>
hTHQJyd3C6ww/OJz07P4bMOgjqBdznSUOsCh6P+0MpF69w2tln/PFLdx/EP4/VKX
</SignatureValue>
<KeyInfo>
<KeyValue>
ETC, ETC, ETC......


