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(Unicode C) CoSign PKCS7/CMS Signed DataSee more Digital Signatures ExamplesDemonstrates how to add a 2nd signature to a CMS SignedData. This is to add an additional signature, SignerInfo and certificate(s) to an existing CMS signed data. In this example, we cosign an existing pdf.p7s Note: The CoSign method is added in Chilkat v9.5.0.89.
#include <C_CkCrypt2W.h> #include <C_CkCertW.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkCrypt2W crypt; HCkCertW cert; BOOL success; HCkBinDataW bd; HCkBinDataW bd2; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. crypt = CkCrypt2W_Create(); cert = CkCertW_Create(); // If loading from a smart card, set the smartcard PIN. CkCertW_putSmartCardPin(cert,L"0000"); // Load a certificate in some way, such as from a smart card. // Chilkat provides other methods to load from a .pfx, .pem, or from the Windows certificate stores.. success = CkCertW_LoadFromSmartcard(cert,L""); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); return; } success = CkCrypt2W_SetSigningCert(crypt,cert); if (success == FALSE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); return; } // Load the file to be co-signed. // NOTE: This is to cosign a PDF file contained within a CMS (PKCS7) message. // (In other words, the PDF is contained within the CMS SignedData, rather than the other way around // where a CMS signature is contained within a PDF. Use Chilkat's PDF class to sign a PDF, which is // to embed a CMS signature within the PDF.) bd = CkBinDataW_Create(); success = CkBinDataW_LoadFile(bd,L"qa_data/p7s/cosign/sample.pdf.p7s"); if (success == FALSE) { wprintf(L"Failed to load pdf.p7s input file.\n"); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); CkBinDataW_Dispose(bd); return; } // bd2 will contain the co-signed result. bd2 = CkBinDataW_Create(); success = CkCrypt2W_CoSign(crypt,bd,cert,bd2); if (success == FALSE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); CkBinDataW_Dispose(bd); CkBinDataW_Dispose(bd2); return; } success = CkBinDataW_WriteFile(bd,L"qa_output/cosigned.pdf.p7s"); if (success == FALSE) { wprintf(L"Failed to save pdf.p7s output file.\n"); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); CkBinDataW_Dispose(bd); CkBinDataW_Dispose(bd2); return; } wprintf(L"Success!\n"); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); CkBinDataW_Dispose(bd); CkBinDataW_Dispose(bd2); } |
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