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(Unicode C) Create XML Digital Signature using HMAC KeyDemonstrates how to create an XML digital signature using an HMAC key.
#include <C_CkHttpW.h> #include <C_CkStringBuilderW.h> #include <C_CkXmlDSigGenW.h> void ChilkatSample(void) { const wchar_t *url; HCkHttpW http; HCkStringBuilderW sbXml; BOOL success; HCkXmlDSigGenW xmlSigGen; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Signs the following XML using an HMAC key. // <?xml version="1.0" encoding="UTF-8" standalone="no"?> // <collection Id="root"> // <album> // <title>Questions, unanswered</title> // <artist>Steve and the flubberblubs</artist> // <year>1989</year> // <t:tracks xmlns:t="http://test.xades4j/tracks"> // <t:song length="4:05" tracknumber="1"> // <t:title>What do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:31</t:lastplayed> // </t:song> // <t:song length="3:45" tracknumber="2"> // <t:title>Who do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:35</t:lastplayed> // </t:song> // <t:song length="5:14" tracknumber="3"> // <t:title>When do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:39</t:lastplayed> // </t:song> // <t:song length="4:19" tracknumber="4"> // <t:title>Do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:44</t:lastplayed> // </t:song> // </t:tracks> // </album> // </collection> // // The above XML is available at https://www.chilkatsoft.com/exampleData/flubberblub.xml // Fetch the XML and then sign it.. url = L"https://www.chilkatsoft.com/exampleData/flubberblub.xml"; http = CkHttpW_Create(); sbXml = CkStringBuilderW_Create(); success = CkHttpW_QuickGetSb(http,url,sbXml); if (success != TRUE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbXml); return; } xmlSigGen = CkXmlDSigGenW_Create(); // The Signature will be inserted under the "collection" element. CkXmlDSigGenW_putSigLocation(xmlSigGen,L"collection"); // Sign everything in <collection Id="root"> ... </collection> CkXmlDSigGenW_AddSameDocRef(xmlSigGen,L"root",L"sha256",L"C14N",L"",L""); // Specify the HMAC key. // For example, if the HMAC key is to be the us-ascii bytes of the string "secret", // the HMAC key can be set in any of the following ways (and also more ways not shown here..) CkXmlDSigGenW_SetHmacKey(xmlSigGen,L"secret",L"ascii"); // or CkXmlDSigGenW_SetHmacKey(xmlSigGen,L"c2VjcmV0",L"base64"); // or CkXmlDSigGenW_SetHmacKey(xmlSigGen,L"736563726574",L"hex"); // Sign the XML.. success = CkXmlDSigGenW_CreateXmlDSigSb(xmlSigGen,sbXml); if (success != TRUE) { wprintf(L"%s\n",CkXmlDSigGenW_lastErrorText(xmlSigGen)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbXml); CkXmlDSigGenW_Dispose(xmlSigGen); return; } // Examine the signed XML: wprintf(L"%s\n",CkStringBuilderW_getAsString(sbXml)); // The output is: // // <?xml version="1.0" encoding="UTF-8" standalone="no"?> // <collection Id="root"> // <album> // <title>Questions, unanswered</title> // <artist>Steve and the flubberblubs</artist> // <year>1989</year> // <t:tracks xmlns:t="http://test.xades4j/tracks"> // <t:song length="4:05" tracknumber="1"> // <t:title>What do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:31</t:lastplayed> // </t:song> // <t:song length="3:45" tracknumber="2"> // <t:title>Who do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:35</t:lastplayed> // </t:song> // <t:song length="5:14" tracknumber="3"> // <t:title>When do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:39</t:lastplayed> // </t:song> // <t:song length="4:19" tracknumber="4"> // <t:title>Do you know?</t:title> // <t:artist>Steve and the flubberblubs</t:artist> // <t:lastplayed>2006-10-17-08:44</t:lastplayed> // </t:song> // </t:tracks> // </album> // <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#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"/><ds:Reference URI="#root"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>rD/g8soqKz8EiPUBhEWfcQacS0ta4ULHX3dKMEH6ZoQ=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>R8dXP95VRYJBfL6d0Peogybdk27+R+JIfX8jnVu0NOI=</ds:SignatureValue></ds:Signature></collection> // CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbXml); CkXmlDSigGenW_Dispose(xmlSigGen); } |
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