(Go) 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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    // 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.

    crypt := chilkat.NewCrypt2()

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

    cert := chilkat.NewCert()
    success := cert.LoadPfxFile(pfxPath,pfxPassword)
    if success != true {
        fmt.Println(cert.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    // Provide the signing cert (with associated private key).
    success = crypt.SetSigningCert(cert)
    if success != true {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    // Indicate that SHA-256 should be used.
    crypt.SetHashAlgorithm("sha256")

    // Specify the signed attributes to be included.
    // (This is what makes it CAdES-BES compliant.)
    jsonSignedAttrs := chilkat.NewJsonObject()
    jsonSignedAttrs.UpdateInt("contentType",1)
    jsonSignedAttrs.UpdateInt("signingTime",1)
    jsonSignedAttrs.UpdateInt("messageDigest",1)
    jsonSignedAttrs.UpdateInt("signingCertificateV2",1)
    crypt.SetSigningAttributes(jsonSignedAttrs.Emit())

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

    // Create the CAdES-BES signature, which contains the original data.
    success = crypt.CreateP7M(inFile,sigFile)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        jsonSignedAttrs.DisposeJsonObject()
        return
    }

    // Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
    encryptCert := chilkat.NewCert()
    success = encryptCert.LoadFromFile("qa_data/certs/fatturapa_cert.pem")
    if success != true {
        fmt.Println(encryptCert.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        jsonSignedAttrs.DisposeJsonObject()
        encryptCert.DisposeCert()
        return
    }

    crypt.SetCryptAlgorithm("pki")

    success = crypt.SetEncryptCert(encryptCert)
    if success != true {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        jsonSignedAttrs.DisposeJsonObject()
        encryptCert.DisposeCert()
        return
    }

    // Indicate the underlying bulk encryption algorithm to be used:
    crypt.SetPkcs7CryptAlg("aes")
    crypt.SetKeyLength(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.SetOaepPadding(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,"qa_output/signed_and_encrypted.p7m")
    if success != true {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        jsonSignedAttrs.DisposeJsonObject()
        encryptCert.DisposeCert()
        return
    }

    fmt.Println("Success.")

    crypt.DisposeCrypt2()
    cert.DisposeCert()
    jsonSignedAttrs.DisposeJsonObject()
    encryptCert.DisposeCert()