(Swift 3,4,5...) Create a CAdES-T Signature

Demonstrates how to create a signature with an external timestamp that certifies the time of signing. This requires an online TSA (Time Stamping Authority) service that is capable of producing RFC 3161 compliant timestamps.

Note: This example requires Chilkat v9.5.0.78 or greater.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()!

    // This example will use a certificate + private key from a .pfx/.p12 file.
    // On Windows systems, it is also possible to use certs on smartcards/usb tokens or certs pre-installed in the Windows registry.
    let cert = CkoCert()!

    var pfxPath: String? = "qa_data/pfx/myCertAndKey.p12"
    var pfxPassword: String? = "test123"

    var success: Bool = cert.loadPfxFile(pfxPath, password: pfxPassword)
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    success = crypt.setSigning(cert)

    // Use SHA-256 rather than the default of SHA-1
    crypt.hashAlgorithm = "sha256"

    // Create JSON that tells Chilkat what signing attributes to include:
    let attrs = CkoJsonObject()!
    attrs.updateBool("contentType", value: true)
    attrs.updateBool("signingTime", value: true)
    attrs.updateBool("messageDigest", value: true)
    attrs.updateBool("signingCertificateV2", value: true)

    // A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
    // We must include the TSA's URL, as well as a few options to indicate what is desired.
    // Except for the TSA URL, the options shown here are typically what you would need.
    attrs.updateBool("timestampToken.enabled", value: true)
    attrs.update("timestampToken.tsaUrl", value: "https://freetsa.org/tsr")
    attrs.updateBool("timestampToken.addNonce", value: false)
    attrs.updateBool("timestampToken.requestTsaCert", value: true)
    attrs.update("timestampToken.hashAlg", value: "sha256")

    crypt.signingAttributes = attrs.emit()

    var inFile: String? = "qa_data/json/sample.json"
    var outFile: String? = "qa_output/sample_cades_t.p7m"

    // This creates the CAdES-T signature.  During the signature creation, it
    // communicates with the TSA to get a timestampToken.
    success = crypt.createP7M(inFile, p7mPath: outFile)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success.")

}