(Tcl) 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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load ./chilkat.dll

# 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.

set crypt [new_CkCrypt2]

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

set cert [new_CkCert]

set success [CkCert_LoadPfxFile $cert $pfxPath $pfxPassword]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    exit
}

# Provide the signing cert (with associated private key).
set success [CkCrypt2_SetSigningCert $crypt $cert]
if {$success != 1} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    exit
}

# Indicate that SHA-256 should be used.
CkCrypt2_put_HashAlgorithm $crypt "sha256"

# Specify the signed attributes to be included.
# (This is what makes it CAdES-BES compliant.)
set jsonSignedAttrs [new_CkJsonObject]

CkJsonObject_UpdateInt $jsonSignedAttrs "contentType" 1
CkJsonObject_UpdateInt $jsonSignedAttrs "signingTime" 1
CkJsonObject_UpdateInt $jsonSignedAttrs "messageDigest" 1
CkJsonObject_UpdateInt $jsonSignedAttrs "signingCertificateV2" 1
CkCrypt2_put_SigningAttributes $crypt [CkJsonObject_emit $jsonSignedAttrs]

set inFile "qa_data/xml/IT01234567890_11002.xml"
set sigFile "qa_data/fatturapa/signed.p7m"

# Create the CAdES-BES signature, which contains the original data.
set success [CkCrypt2_CreateP7M $crypt $inFile $sigFile]
if {$success == 0} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $jsonSignedAttrs
    exit
}

# Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
set encryptCert [new_CkCert]

set success [CkCert_LoadFromFile $encryptCert "qa_data/certs/fatturapa_cert.pem"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $encryptCert]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $jsonSignedAttrs
    delete_CkCert $encryptCert
    exit
}

CkCrypt2_put_CryptAlgorithm $crypt "pki"

set success [CkCrypt2_SetEncryptCert $crypt $encryptCert]
if {$success != 1} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $jsonSignedAttrs
    delete_CkCert $encryptCert
    exit
}

# Indicate the underlying bulk encryption algorithm to be used:
CkCrypt2_put_Pkcs7CryptAlg $crypt "aes"
CkCrypt2_put_KeyLength $crypt 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)
CkCrypt2_put_OaepPadding $crypt 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.
set success [CkCrypt2_CkEncryptFile $crypt $sigFile "qa_output/signed_and_encrypted.p7m"]
if {$success != 1} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $jsonSignedAttrs
    delete_CkCert $encryptCert
    exit
}

puts "Success."

delete_CkCrypt2 $crypt
delete_CkCert $cert
delete_CkJsonObject $jsonSignedAttrs
delete_CkCert $encryptCert