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(Unicode C) Decrypt a govtalk.gov.uk SOAP GovTalkMessageDemonstrates how to decrypt the content contained in the XML of a GovTalkMessage SOAP response.
#include <C_CkXmlW.h> #include <C_CkCertW.h> #include <C_CkCrypt2W.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkXmlW xml; BOOL success; const wchar_t *Body; HCkCertW cert; HCkCrypt2W crypt; HCkBinDataW bd; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The GovTalkMessage response looks something like this: // <?xml version="1.0" encoding="utf-8"?> // <GovTalkMessage xmlns="http://www.govtalk.gov.uk/CM/envelope"> // <EnvelopeVersion>3.1</EnvelopeVersion> // <Header> // <MessageDetails> // <Class>CSSZ_DZDPN</Class> // <Qualifier>request</Qualifier> // <Function>submit</Function> // <TransactionID /> // <AuditID /> // <CorrelationID>aaaaa</CorrelationID> // <ResponseEndPoint PollInterval="0" /> // <Transformation>XML</Transformation> // <GatewayTest /> // <GatewayTimestamp /> // </MessageDetails> // <SenderDetails> // <IDAuthentication> // <SenderID /> // <Authentication> // <Method>clear</Method> // <Role /> // <Value /> // </Authentication> // </IDAuthentication> // <X509Certificate /> // <EmailAddress>somebody@example.com</EmailAddress> // </SenderDetails> // </Header> // <GovTalkDetails> // <Keys> // <Key Type="vars">9999999999</Key> // </Keys> // <GatewayAdditions> // <Source>VREP</Source> // </GatewayAdditions> // </GovTalkDetails> // <Body> // <Message xmlns="http://www.cssz.cz/XMLSchema/envelope" version="1.2" eType="DZDPN20"> // <Header> // <Signature xmlns:dt="urn:schemas-microsoft-com:datatypes" dt:dt="bin.base64">MIIJ0A ... UMw= // </Signature> // <Vendor productName="some product name" version="2019" /> // </Header> // <Body xmlns:dt="urn:schemas-microsoft-com:datatypes" encrypted="yes" contentEncoding="gzip" dt:dt="bin.base64">MIIF2w ... N2vW</Body> // </Message> // </Body> // </GovTalkMessage> // We want to get the content of the Body and decrypt it. // First, let's get the content of the Body XML element, which is a base64 string starting with MIIF2w... xml = CkXmlW_Create(); success = CkXmlW_LoadXmlFile(xml,L"qa_data/xml/govTalkMessageResponse.xml"); if (success == FALSE) { wprintf(L"%s\n",CkXmlW_lastErrorText(xml)); CkXmlW_Dispose(xml); return; } Body = CkXmlW_getChildContent(xml,L"Body|Message|Body"); wprintf(L"%s\n",Body); cert = CkCertW_Create(); success = CkCertW_LoadPfxFile(cert,L"qa_data/pfx/govTalkMessage_aaa.pfx",L"aaa"); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkXmlW_Dispose(xml); CkCertW_Dispose(cert); return; } crypt = CkCrypt2W_Create(); CkCrypt2W_putCryptAlgorithm(crypt,L"pki"); success = CkCrypt2W_SetDecryptCert(crypt,cert); if (success == FALSE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkXmlW_Dispose(xml); CkCertW_Dispose(cert); CkCrypt2W_Dispose(crypt); return; } bd = CkBinDataW_Create(); // Append the bytes to bd. success = CkBinDataW_AppendEncoded(bd,Body,L"base64"); // Decrypt in-place. success = CkCrypt2W_DecryptBd(crypt,bd); if (success == FALSE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkXmlW_Dispose(xml); CkCertW_Dispose(cert); CkCrypt2W_Dispose(crypt); CkBinDataW_Dispose(bd); return; } // Save the decrypted data to a file. success = CkBinDataW_WriteFile(bd,L"qa_output/out.dat"); // If the decrypted data is non-text (binary) then we can examine it in an encoding, such as hex: wprintf(L"Decrypted bytes as hex: %s\n",CkBinDataW_getEncoded(bd,L"hex")); CkXmlW_Dispose(xml); CkCertW_Dispose(cert); CkCrypt2W_Dispose(crypt); CkBinDataW_Dispose(bd); } |
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