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(Lianja) Include the SigningCertificateV2 Authenticated Attribute in CAdES (CMS) SignatureDemonstrates how to include the SigningCertificateV2 authenticated attribute in a CMS (.p7m/.p7s) signature.
// This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. loCrypt = createobject("CkCrypt2") loCert = createobject("CkCert") llSuccess = loCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123") if (llSuccess <> .T.) then ? loCert.LastErrorText release loCrypt release loCert return endif // Tell the crypt component to use this cert. llSuccess = loCrypt.SetSigningCert(loCert) if (llSuccess <> .T.) then ? loCrypt.LastErrorText release loCrypt release loCert return endif // The CadesEnabled property applies to all methods that create PKCS7 signatures. // To create a CAdES-BES signature, set this property equal to true. loCrypt.CadesEnabled = .T. loCrypt.HashAlgorithm = "sha256" // We can sign any type of file, creating a .p7s as output. // The .p7s contains the signature and also embeds the data of the file that is signed. lcInFile = "qa_data/pdf/sample.pdf" lcP7sFile = "qa_output/sample.pdf.p7s" loJsonSigningAttrs = createobject("CkJsonObject") loJsonSigningAttrs.UpdateInt("contentType",1) loJsonSigningAttrs.UpdateInt("signingTime",1) loJsonSigningAttrs.UpdateInt("messageDigest",1) // This is where we specify for the signingCertificateV2 attribute to be included: loJsonSigningAttrs.UpdateInt("signingCertificateV2",1) loCrypt.SigningAttributes = loJsonSigningAttrs.Emit() // By default, all the certs in the chain of authentication are included in the signature. // If desired, we can choose to only include the signing certificate: loCrypt.IncludeCertChain = .F. // Create the CAdES-BES attached signature, which contains the original data. // Note: Chilkat's function naming is not accurate. CreateP7M creates a PKCS7 signature where the signed file // is contained within the signature. CreateP7S creates a detached PKCS7 signature where the signed file // is NOT contained within the signature. We want the data to be contained in the signature, therefore // we call CreateP7M even though we are naming our output file .p7s. llSuccess = loCrypt.CreateP7M(lcInFile,lcP7sFile) if (llSuccess = .F.) then ? loCrypt.LastErrorText release loCrypt release loCert release loJsonSigningAttrs return endif // Verify the .p7s file and extract the original file from the .p7s. lcExtractedToFilePath = "qa_output/sample.pdf" llSuccess = loCrypt.VerifyP7M(lcP7sFile,lcExtractedToFilePath) if (llSuccess = .F.) then ? loCrypt.LastErrorText release loCrypt release loCert release loJsonSigningAttrs return endif ? "Success!" release loCrypt release loCert release loJsonSigningAttrs |
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