(Swift 3,4,5...) FatturaPA XML Invoice Sign+Encrypt to P7M

Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system.

Note: This example requires Chilkat v9.5.0.75 or greater.

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func chilkatTest() {
    // Note: Requires Chilkat v9.5.0.75 or greater.

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

    let crypt = CkoCrypt2()!

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    var pfxPath: String? = "qa_data/pfx/cert_test123.pfx"
    var pfxPassword: String? = "test123"

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

    // Provide the signing cert (with associated private key).
    success = crypt.setSigning(cert)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Indicate that SHA-256 should be used.
    crypt.hashAlgorithm = "sha256"

    // Specify the signed attributes to be included.
    // (This is what makes it CAdES-BES compliant.)
    let jsonSignedAttrs = CkoJsonObject()!
    jsonSignedAttrs.updateInt("contentType", value: 1)
    jsonSignedAttrs.updateInt("signingTime", value: 1)
    jsonSignedAttrs.updateInt("messageDigest", value: 1)
    jsonSignedAttrs.updateInt("signingCertificateV2", value: 1)
    crypt.signingAttributes = jsonSignedAttrs.emit()

    var inFile: String? = "qa_data/xml/IT01234567890_11002.xml"
    var sigFile: String? = "qa_data/fatturapa/signed.p7m"

    // Create the CAdES-BES signature, which contains the original data.
    success = crypt.createP7M(inFile, p7mPath: sigFile)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
    let encryptCert = CkoCert()!
    success = encryptCert.load(fromFile: "qa_data/certs/fatturapa_cert.pem")
    if success != true {
        print("\(encryptCert.lastErrorText!)")
        return
    }

    crypt.cryptAlgorithm = "pki"

    success = crypt.setEncryptCert(encryptCert)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Indicate the underlying bulk encryption algorithm to be used:
    crypt.pkcs7CryptAlg = "aes"
    crypt.keyLength = 128

    // There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
    // By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to true to
    // use RSAES_OAEP.  (We'll leave it set at the default value of false)
    crypt.oaepPadding = false

    // Everything is specified.  Encrypt the .p7m to create a new .p7m (which adds a layer of encryption around the opaque signature).
    // The output is PKCS7 in binary DER format.
    success = crypt.ckEncryptFile(sigFile, destFile: "qa_output/signed_and_encrypted.p7m")
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success.")

}