Lua

Verify and Unwrap S/MIME, and get Information about CMS Signature

See more MIME Examples

Demonstrates calling the Verify method to verify and unwrap S/MIME. The MIME is restored to the original structure that it would have originally had prior to signing. The Verify method works with both detached signatures, as well as opaque/attached signatures.

Calls LastJsonData to get information about the signature(s) that were verified.

Lua

local chilkat = require("chilkat")

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

local mime = chilkat.Mime.new()

-- Load the signed MIME from a file...
local success = mime:load_mime_file("qa_data/mime/detached_sig.eml")
if not success then
    print(mime.last_error_text)
    return
end

-- Verify the S/MIME and restore the MIME
-- to the structure/content it had prior to signing.
local verified = mime:verify()
if not verified then
    print(mime.last_error_text)
    return
end

-- Examine the details of what was verified.
local json = chilkat.JsonObject.new()
mime:get_last_json_data(json)

json.emit_compact = false
print(json:emit())

-- The code to parse the following JSON (i.e. extract desired information) is shown below..

-- {
--   "pkcs7": {
--     "verify": {
--       "certs": [
--         {
--           "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3",
--           "serial": "0702A21A85B84B659E180A6EE6F5A365"
--         },
--         {
--           "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3",
--           "serial": "008B5B75568454850B00CFAF3848CEB1A4"
--         },
--         {
--           "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5",
--           "serial": "619C55C32FF6BD1A7B7E0330D21C8F3C"
--         }
--       ],
--       "digestAlgorithms": [
--         "sha1"
--       ],
--       "signerInfo": [
--         {
--           "cert": {
--             "serialNumber": "619C55C32FF6BD1A7B7E0330D21C8F3C",
--             "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5",
--             "digestAlgOid": "1.3.14.3.2.26",
--             "digestAlgName": "SHA1"
--           },
--           "contentType": "1.2.840.113549.1.7.1",
--           "signingTime": "160428055000Z",
--           "messageDigest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY=",
--           "signingAlgOid": "1.2.840.113549.1.1.1",
--           "signingAlgName": "RSA-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": "160428055000Z"
--             },
--             "1.2.840.113549.1.9.4": {
--               "name": "messageDigest",
--               "digest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY="
--             },
--             "1.2.840.113549.1.9.15": {
--               "der": "MFAwCwYJYIZIAWUDBAECMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKA=="
--             },
--             "1.3.6.1.4.1.311.16.4": {
--               "der": "MIG7MIG...7fgMw0hyPPA=="
--             }
--           }
--         }
--       ]
--     }
--   }
-- }

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

local signingTime = chilkat.DtObj.new()
local authAttrSigningTimeUtctime = chilkat.DtObj.new()
local issuerCN = ""
local serial = ""
local strVal = ""
local certSerialNumber = ""
local certIssuerCN = ""
local certDigestAlgOid = ""
local certDigestAlgName = ""
local contentType = ""
local messageDigest = ""
local signingAlgOid = ""
local signingAlgName = ""
local authAttrContentTypeName = ""
local authAttrContentTypeOid = ""
local authAttrSigningTimeName = ""
local authAttrMessageDigestName = ""
local authAttrMessageDigestDigest = ""
local authAttr1_2_840_113549_1_9_15Der = ""
local authAttr1_3_6_1_4_1_311_16_4Der = ""

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
    certSerialNumber = json:string_of("pkcs7.verify.signerInfo[i].cert.serialNumber")
    certIssuerCN = json:string_of("pkcs7.verify.signerInfo[i].cert.issuerCN")
    certDigestAlgOid = json:string_of("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
    certDigestAlgName = json:string_of("pkcs7.verify.signerInfo[i].cert.digestAlgName")
    contentType = json:string_of("pkcs7.verify.signerInfo[i].contentType")
    json:dt_of("pkcs7.verify.signerInfo[i].signingTime", false, signingTime)
    messageDigest = json:string_of("pkcs7.verify.signerInfo[i].messageDigest")
    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")
    authAttr1_2_840_113549_1_9_15Der = json:string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.15\".der")
    authAttr1_3_6_1_4_1_311_16_4Der = json:string_of("pkcs7.verify.signerInfo[i].authAttr.\"1.3.6.1.4.1.311.16.4\".der")
    i = i + 1
end