B4X

FatturaPA XML Invoice Sign+Encrypt to P7M

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Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system. B4X

Dim success As Boolean = False

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

Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

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

Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadPfxFile(pfxPath, pfxPassword)
If success = False Then
    Log(cert.LastErrorText)
    Return
End If


'  Provide the signing cert (with associated private key).
success = crypt.SetSigningCert(cert)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


'  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.)
Dim jsonSignedAttrs As ChilkatJsonObject
jsonSignedAttrs.Initialize
jsonSignedAttrs.UpdateInt("contentType", 1)
jsonSignedAttrs.UpdateInt("signingTime", 1)
jsonSignedAttrs.UpdateInt("messageDigest", 1)
jsonSignedAttrs.UpdateInt("signingCertificateV2", 1)
crypt.SigningAttributes = jsonSignedAttrs.Emit

Dim inFile As String = "qa_data/xml/IT01234567890_11002.xml"
Dim sigFile As String = "qa_data/fatturapa/signed.p7m"

'  Create the CAdES-BES signature, which contains the original data.
success = crypt.CreateP7M(inFile, sigFile)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


'  Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
Dim encryptCert As ChilkatCert
encryptCert.Initialize("encryptCert")
success = encryptCert.LoadFromFile("qa_data/certs/fatturapa_cert.pem")
If success = False Then
    Log(encryptCert.LastErrorText)
    Return
End If


crypt.CryptAlgorithm = "pki"

success = crypt.SetEncryptCert(encryptCert)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


'  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, "qa_output/signed_and_encrypted.p7m")
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


Log("Success.")