Lua 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. Lua

local chilkat = require("chilkat")

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

local crypt = chilkat.Crypt2.new()

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

-- Verify the signature and extract the contained file, which in this case is XML.
local success = crypt:verify_p7_m(inFile, outputFile)
if not success then
    print(crypt.last_error_text)
    return
end

print("Signature validated.")

-- Now let's examine the information about the signature.
local json = chilkat.JsonObject.new()
crypt:get_last_json_data(json)

json.emit_compact = 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

local authAttrSigningTimeUtctime = chilkat.DtObj.new()
local issuerCN = ""
local serial = ""
local strVal = ""
local certSubjectKeyIdentifier = ""
local certDigestAlgOid = ""
local certDigestAlgName = ""
local signingAlgOid = ""
local signingAlgName = ""
local authAttrContentTypeName = ""
local authAttrContentTypeOid = ""
local authAttrSigningTimeName = ""
local authAttrMessageDigestName = ""
local authAttrMessageDigestDigest = ""
local authAttrSigningCertificateV2Name = ""
local authAttrSigningCertificateV2Der = ""

local i = 0
local count_i = json:size_of_array("pkcs7.verify.certs")
while i < count_i do
    json.i = i
    issuerCN = json:string_of("pkcs7.verify.certs[i].issuerCN")
    serial = json:string_of("pkcs7.verify.certs[i].serial")
    i = i + 1
end

i = 0
count_i = json:size_of_array("pkcs7.verify.digestAlgorithms")
while i < count_i do
    json.i = i
    strVal = json:string_of("pkcs7.verify.digestAlgorithms[i]")
    i = i + 1
end

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