CkPython Requires Chilkat v11.0.0+

Verify a CAdES-BES Signature and Examine Signature Contents

See more Digital Signatures Examples

Demonstrates how to validate a .p7m (.p7s) signature and examine the contents of the signature. CkPython

import sys
import chilkat

success = False

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

crypt = chilkat.CkCrypt2()

outputFile = "qa_output/original.xml"
inFile = "qa_data/p7m/fattura_signature.xml.p7m"

#  Verify the signature and extract the contained file, which in this case is XML.
success = crypt.VerifyP7M(inFile,outputFile)
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

print("Signature validated.")

#  Now let's examine the information about the signature.
json = chilkat.CkJsonObject()
crypt.GetLastJsonData(json)

json.put_EmitCompact(False)
print(json.emit())

#  Here's an example of the information about the signature:
#  {
#    "pkcs7": {
#      "verify": {
#        "certs": [
#          {
#            "issuerCN": "Xyz EU Qualified Certificates CA G1",
#            "serial": "99A28A51AC389999"
#          }
#        ],
#        "useConstructedOctets": true,
#        "digestAlgorithms": [
#          "sha256"
#        ],
#        "signerInfo": [
#          {
#            "cert": {
#              "subjectKeyIdentifier": "5VM4x8AWnXf07yzbXuLtbb0U3yY=",
#              "digestAlgOid": "2.16.840.1.101.3.4.2.1",
#              "digestAlgName": "SHA256"
#            },
#            "signingAlgOid": "1.2.840.113549.1.1.11",
#            "signingAlgName": "RSA-SHA256-PKCSV-1_5",
#            "authAttr": {
#              "1.2.840.113549.1.9.3": {
#                "name": "contentType",
#                "oid": "1.2.840.113549.1.7.1"
#              },
#              "1.2.840.113549.1.9.5": {
#                "name": "signingTime",
#                "utctime": "190901152340Z"
#              },
#              "1.2.840.113549.1.9.4": {
#                "name": "messageDigest",
#                "digest": "y+gd/zAQK33A//HInhaZba7w1fUJleV9AHbP1Ntx6U0="
#              },
#              "1.2.840.113549.1.9.16.2.47": {
#                "name": "signingCertificateV2",
#                "der": "MIH4MI..w4vv0="
#              }
#            }
#          }
#        ]
#      }
#    }
#  }

#  Use this online tool to generate parsing code from sample JSON: 
#  Generate Parsing Code from JSON

authAttrSigningTimeUtctime = chilkat.CkDtObj()

i = 0
count_i = json.SizeOfArray("pkcs7.verify.certs")
while i < count_i :
    json.put_I(i)
    issuerCN = json.stringOf("pkcs7.verify.certs[i].issuerCN")
    serial = json.stringOf("pkcs7.verify.certs[i].serial")
    i = i + 1

i = 0
count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms")
while i < count_i :
    json.put_I(i)
    strVal = json.stringOf("pkcs7.verify.digestAlgorithms[i]")
    i = i + 1

i = 0
count_i = json.SizeOfArray("pkcs7.verify.signerInfo")
while i < count_i :
    json.put_I(i)
    certSubjectKeyIdentifier = json.stringOf("pkcs7.verify.signerInfo[i].cert.subjectKeyIdentifier")
    certDigestAlgOid = json.stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
    certDigestAlgName = json.stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName")
    signingAlgOid = json.stringOf("pkcs7.verify.signerInfo[i].signingAlgOid")
    signingAlgName = json.stringOf("pkcs7.verify.signerInfo[i].signingAlgName")
    authAttrContentTypeName = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name")
    authAttrContentTypeOid = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid")
    authAttrSigningTimeName = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name")
    json.DtOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime",False,authAttrSigningTimeUtctime)
    authAttrMessageDigestName = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name")
    authAttrMessageDigestDigest = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest")
    authAttrSigningCertificateV2Name = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".name")
    authAttrSigningCertificateV2Der = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".der")
    i = i + 1