Swift

Include the SigningCertificateV2 Authenticated Attribute in CAdES (CMS) Signature

See more CAdES Examples

Demonstrates how to include the SigningCertificateV2 authenticated attribute in a CMS (.p7m/.p7s) signature. Swift

func chilkatTest() {
    var success: Bool = false

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()!

    let cert = CkoCert()!
    success = cert.loadPfxFile(path: "qa_data/pfx/cert_test123.pfx", password: "test123")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    // Tell the crypt component to use this cert.
    success = crypt.setSigningCert(cert: cert)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // The CadesEnabled property applies to all methods that create PKCS7 signatures. 
    // To create a CAdES-BES signature, set this property equal to true. 
    crypt.cadesEnabled = true

    crypt.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.
    var inFile: String? = "qa_data/pdf/sample.pdf"
    var p7sFile: String? = "qa_output/sample.pdf.p7s"

    let jsonSigningAttrs = CkoJsonObject()!
    jsonSigningAttrs.updateInt(jsonPath: "contentType", value: 1)
    jsonSigningAttrs.updateInt(jsonPath: "signingTime", value: 1)
    jsonSigningAttrs.updateInt(jsonPath: "messageDigest", value: 1)

    // This is where we specify for the signingCertificateV2 attribute to be included:
    jsonSigningAttrs.updateInt(jsonPath: "signingCertificateV2", value: 1)

    crypt.signingAttributes = jsonSigningAttrs.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:
    crypt.includeCertChain = false

    // 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.
    success = crypt.createP7M(inPath: inFile, p7mPath: p7sFile)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Verify the .p7s file and extract the original file from the .p7s. 
    var extractedToFilePath: String? = "qa_output/sample.pdf"
    success = crypt.verifyP7M(p7mPath: p7sFile, destPath: extractedToFilePath)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success!")

}