Basic xades support

Author: GauriSpears

src/signed-xml.ts

@@ -802,6 +802,9 @@ export class SignedXml {
 
     signatureXml += this.createSignedInfo(doc, prefix);
     signatureXml += this.getKeyInfo(prefix);
+    if (this.xadesQualifyingProperties != null) {
+      signatureXml += `<${currentPrefix}Object>${this.xadesQualifyingProperties()}</${currentPrefix}Object>`;
+    }
     signatureXml += `</${currentPrefix}Signature>`;
 
     this.originalXmlWithIds = doc.toString();
@@ -918,21 +921,29 @@ export class SignedXml {
     prefix = prefix ? `${prefix}:` : prefix;
 
     for (const ref of this.getReferences()) {
-      const nodes = xpath.selectWithResolver(ref.xpath ?? "", doc, this.namespaceResolver);
+      let nodes = xpath.selectWithResolver(ref.xpath ?? "", doc, this.namespaceResolver);
 
       if (!utils.isArrayHasLength(nodes)) {
-        throw new Error(
-          `the following xpath cannot be signed because it was not found: ${ref.xpath}`,
-        );
+        if (this.xadesQualifyingProperties != null){
+            nodes = xpath.selectWithResolver(ref.xpath ?? "", new xmldom.DOMParser().parseFromString(this.xadesQualifyingProperties()), this.namespaceResolver);
+        }
+        if (!utils.isArrayHasLength(nodes)) {
+          throw new Error(
+            `the following xpath cannot be signed because it was not found: ${ref.xpath}`,
+          );
+        }
       }
 
       for (const node of nodes) {
+        let addattr="";
+        if (node.localName=="SignedProperties") addattr=' Type="http://uri.etsi.org/01903#SignedProperties"';
         if (ref.isEmptyUri) {
-          res += `<${prefix}Reference URI="">`;
-        } else {
-          const id = this.ensureHasId(node);
-          ref.uri = id;
-          res += `<${prefix}Reference URI="#${id}">`;
+            res += `<${prefix}Reference URI=""${addattr}>`;
+        }
+        else {
+            const id = this.ensureHasId(node);
+            ref.uri = id;
+            res += `<${prefix}Reference URI="#${id}"${addattr}>`;
         }
         res += `<${prefix}Transforms>`;
         for (const trans of ref.transforms || []) {