(Visual FoxPro) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loCrypt
LOCAL lcPfxPath
LOCAL lcPfxPassword
LOCAL loCert
LOCAL lnSuccess
LOCAL loJsonSignedAttrs
LOCAL lcInFile
LOCAL lcSigFile
LOCAL loEncryptCert

* 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.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')

* Use a digital certificate and private key from a PFX file (.pfx or .p12).
lcPfxPath = "qa_data/pfx/cert_test123.pfx"
lcPfxPassword = "test123"

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile(lcPfxPath,lcPfxPassword)
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    CANCEL
ENDIF

* Provide the signing cert (with associated private key).
lnSuccess = loCrypt.SetSigningCert(loCert)
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    CANCEL
ENDIF

* Indicate that SHA-256 should be used.
loCrypt.HashAlgorithm = "sha256"

* Specify the signed attributes to be included.
* (This is what makes it CAdES-BES compliant.)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonSignedAttrs = CreateObject('Chilkat.JsonObject')
loJsonSignedAttrs.UpdateInt("contentType",1)
loJsonSignedAttrs.UpdateInt("signingTime",1)
loJsonSignedAttrs.UpdateInt("messageDigest",1)
loJsonSignedAttrs.UpdateInt("signingCertificateV2",1)
loCrypt.SigningAttributes = loJsonSignedAttrs.Emit()

lcInFile = "qa_data/xml/IT01234567890_11002.xml"
lcSigFile = "qa_data/fatturapa/signed.p7m"

* Create the CAdES-BES signature, which contains the original data.
lnSuccess = loCrypt.CreateP7M(lcInFile,lcSigFile)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loJsonSignedAttrs
    CANCEL
ENDIF

* Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loEncryptCert = CreateObject('Chilkat.Cert')
lnSuccess = loEncryptCert.LoadFromFile("qa_data/certs/fatturapa_cert.pem")
IF (lnSuccess <> 1) THEN
    ? loEncryptCert.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loJsonSignedAttrs
    RELEASE loEncryptCert
    CANCEL
ENDIF

loCrypt.CryptAlgorithm = "pki"

lnSuccess = loCrypt.SetEncryptCert(loEncryptCert)
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loJsonSignedAttrs
    RELEASE loEncryptCert
    CANCEL
ENDIF

* Indicate the underlying bulk encryption algorithm to be used:
loCrypt.Pkcs7CryptAlg = "aes"
loCrypt.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 1 to
* use RSAES_OAEP.  (We'll leave it set at the default value of 0)
loCrypt.OaepPadding = 0

* 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.
lnSuccess = loCrypt.CkEncryptFile(lcSigFile,"qa_output/signed_and_encrypted.p7m")
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loJsonSignedAttrs
    RELEASE loEncryptCert
    CANCEL
ENDIF

? "Success."

RELEASE loCrypt
RELEASE loCert
RELEASE loJsonSignedAttrs
RELEASE loEncryptCert