(Lianja) 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.

loCrypt = createobject("CkCrypt2")

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

loCert = createobject("CkCert")
llSuccess = loCert.LoadPfxFile(lcPfxPath,lcPfxPassword)
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCrypt
    release loCert
    return
endif

// Provide the signing cert (with associated private key).
llSuccess = loCrypt.SetSigningCert(loCert)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
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.)
loJsonSignedAttrs = createobject("CkJsonObject")
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.
llSuccess = loCrypt.CreateP7M(lcInFile,lcSigFile)
if (llSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    release loJsonSignedAttrs
    return
endif

// Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
loEncryptCert = createobject("CkCert")
llSuccess = loEncryptCert.LoadFromFile("qa_data/certs/fatturapa_cert.pem")
if (llSuccess <> .T.) then
    ? loEncryptCert.LastErrorText
    release loCrypt
    release loCert
    release loJsonSignedAttrs
    release loEncryptCert
    return
endif

loCrypt.CryptAlgorithm = "pki"

llSuccess = loCrypt.SetEncryptCert(loEncryptCert)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    release loJsonSignedAttrs
    release loEncryptCert
    return
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 .T. to
// use RSAES_OAEP.  (We'll leave it set at the default value of .F.)
loCrypt.OaepPadding = .F.

// 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.
llSuccess = loCrypt.CkEncryptFile(lcSigFile,"qa_output/signed_and_encrypted.p7m")
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    release loJsonSignedAttrs
    release loEncryptCert
    return
endif

? "Success."


release loCrypt
release loCert
release loJsonSignedAttrs
release loEncryptCert