CkPython

FatturaPA XML Invoice Sign+Encrypt to P7M

See more Digital Signatures Examples

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

import sys
import chilkat

success = False

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

crypt = chilkat.CkCrypt2()

# 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.CkCert()
success = cert.LoadPfxFile(pfxPath,pfxPassword)
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

# Provide the signing cert (with associated private key).
success = crypt.SetSigningCert(cert)
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

# Indicate that SHA-256 should be used.
crypt.put_HashAlgorithm("sha256")

# Specify the signed attributes to be included.
# (This is what makes it CAdES-BES compliant.)
jsonSignedAttrs = chilkat.CkJsonObject()
jsonSignedAttrs.UpdateInt("contentType",1)
jsonSignedAttrs.UpdateInt("signingTime",1)
jsonSignedAttrs.UpdateInt("messageDigest",1)
jsonSignedAttrs.UpdateInt("signingCertificateV2",1)
crypt.put_SigningAttributes(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):
    print(crypt.lastErrorText())
    sys.exit()

# Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
encryptCert = chilkat.CkCert()
success = encryptCert.LoadFromFile("qa_data/certs/fatturapa_cert.pem")
if (success == False):
    print(encryptCert.lastErrorText())
    sys.exit()

crypt.put_CryptAlgorithm("pki")

success = crypt.SetEncryptCert(encryptCert)
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

# Indicate the underlying bulk encryption algorithm to be used:
crypt.put_Pkcs7CryptAlg("aes")
crypt.put_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.put_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):
    print(crypt.lastErrorText())
    sys.exit()

print("Success.")