add URI in Reference

signature.go

@@ -25,18 +25,19 @@ type Method struct {
 //    buf, _ = Sign(key, buf)
 //
 type Reference struct {
-	XMLName      xml.Name `xml:"http://www.w3.org/2000/09/xmldsig# Reference"`
 	URI          string   `xml:",attr"`
 	Transforms   []Method `xml:"Transforms>Transform"`
-	DigestMethod Method   `xml:"DigestMethod"`
-	DigestValue  string   `xml:"DigestValue"`
+	DigestMethod Method
+	DigestValue  string
+}
+type SignedInfo struct {
+	CanonicalizationMethod Method `xml:"CanonicalizationMethod"`
+	SignatureMethod        Method `xml:"SignatureMethod"`
+	Reference              Reference
 }
 type Signature struct {
 	XMLName         xml.Name `xml:"http://www.w3.org/2000/09/xmldsig# Signature"`
-
-	CanonicalizationMethod Method             `xml:"SignedInfo>CanonicalizationMethod"`
-	SignatureMethod        Method             `xml:"SignedInfo>SignatureMethod"`
-	Reference              Reference          `xml:"http://www.w3.org/2000/09/xmldsig# Reference"`
+	SignedInfo      SignedInfo
 	SignatureValue  string             `xml:"SignatureValue"`
 	KeyName         string             `xml:"KeyInfo>KeyName,omitempty"`
 	X509Certificate *SignatureX509Data `xml:"KeyInfo>X509Data,omitempty"`
@@ -55,6 +56,7 @@ func DefaultSignature(pemEncodedPublicKey []byte) Signature {
 	certStr := base64.StdEncoding.EncodeToString(pemBlock.Bytes)
 
 	return Signature{
+		SignedInfo: SignedInfo{
 			CanonicalizationMethod: Method{
 				Algorithm: "http://www.w3.org/TR/2001/REC-xml-c14n-20010315",
 			},
@@ -62,7 +64,6 @@ func DefaultSignature(pemEncodedPublicKey []byte) Signature {
 				Algorithm: "http://www.w3.org/2000/09/xmldsig#rsa-sha1",
 			},
 			Reference: Reference{
-			URI: "#pfxd0b69e8d-7ef1-bc79-e854-76787764d7ee",
 				Transforms: []Method{
 					Method{Algorithm: "http://www.w3.org/2000/09/xmldsig#enveloped-signature"},
 				},
@@ -70,6 +71,7 @@ func DefaultSignature(pemEncodedPublicKey []byte) Signature {
 					Algorithm: "http://www.w3.org/2000/09/xmldsig#sha1",
 				},
 			},
+		},
 		X509Certificate: &SignatureX509Data{
 			X509Certificate: certStr,
 		},