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(Unicode C) Extract SignatureValue from Signed XMLSee more XML Digital Signatures ExamplesDemonstrates how to extract the signature value from signed XML.
#include <C_CkStringBuilderW.h> #include <C_CkXmlW.h> void ChilkatSample(void) { const wchar_t *filePath; HCkStringBuilderW sb; BOOL success; const wchar_t *base64Sig; HCkXmlW xml; HCkXmlW xSigVal; // This example will work with the following signed XML, which as been reformatted for readability. // <?xml version="1.0" encoding="utf-8"?> // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> // <SOAP-ENV:Header> // <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"> // <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> // <ds:SignedInfo> // <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"> // <InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV"/> // </ds:CanonicalizationMethod> // <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/> // <ds:Reference URI="#Body"> // <ds:Transforms> // <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/> // </ds:Transforms> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue> // </ds:Reference> // </ds:SignedInfo> // <ds:SignatureValue>C+7FWngU....DJFBcdg==</ds:SignatureValue> // <ds:KeyInfo> // <ds:KeyValue> // <ds:RSAKeyValue> // <ds:Modulus>sXeRhM55P13.....NAcibRw==</ds:Modulus> // <ds:Exponent>AQAB</ds:Exponent> // </ds:RSAKeyValue> // </ds:KeyValue> // </ds:KeyInfo> // </ds:Signature> // </wsse:Security> // </SOAP-ENV:Header> // <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body"> // <z:FooBar xmlns:z="http://example.com"/> // </SOAP-ENV:Body> // </SOAP-ENV:Envelope> // ----------------------------------------------------------------------------------------- // There are a number of ways we can get the contents of the <ds:SignatureValue>...</ds:SignatureValue> filePath = L"qa_data/xml_dsig_testing/sample_to_show_how_to_extract_sig.xml"; // If you know there will only be a single SignatureValue in the XML, you don't need to parse XML. // Just do quick and simple string search.. // For example: sb = CkStringBuilderW_Create(); success = CkStringBuilderW_LoadFile(sb,filePath,L"utf-8"); if (success == FALSE) { wprintf(L"Failed to load file.\n"); CkStringBuilderW_Dispose(sb); return; } base64Sig = CkStringBuilderW_getBetween(sb,L"SignatureValue>",L"</"); wprintf(L"base64Sig = %s\n",base64Sig); // ----------------------------------------------------------------------------------------- // If the XML might contain multiple signatures, but the signatures will always be located in the // same place, then you can (beforehand) copy a sample signed XML into Chilkat's online tool // at Generate Parsing Code from XML // to get the path to the SignatureValue. For example, the line of code generated for the SignatureValue // for the above XML is: // string ds_SignatureValue = xml.GetChildContent("SOAP-ENV:Header|wsse:Security|ds:Signature|ds:SignatureValue"); // So you can simply use that path.. xml = CkXmlW_Create(); success = CkXmlW_LoadXmlFile(xml,filePath); // Assume success.. base64Sig = CkXmlW_getChildContent(xml,L"SOAP-ENV:Header|wsse:Security|ds:Signature|ds:SignatureValue"); wprintf(L"base64Sig = %s\n",base64Sig); // ----------------------------------------------------------------------------------------- // Or perhaps you don't know where the signature is located in the XML. // You can search for the tag.. xSigVal = CkXmlW_SearchForTag(xml,xml,L"*:SignatureValue"); if (CkXmlW_getLastMethodSuccess(xml) == TRUE) { wprintf(L"base64Sig = %s\n",CkXmlW_content(xSigVal)); CkXmlW_Dispose(xSigVal); } else { wprintf(L"No SignatureValue found.\n"); } CkStringBuilderW_Dispose(sb); CkXmlW_Dispose(xml); } |
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