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(VBScript) Validate PDF Signatures

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get information from each signature.

Note: This example requires Chilkat v9.5.0.85 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Pdf")
set pdf = CreateObject("Chilkat.Pdf")

' Load a PDF that has cryptographic signatures to be validated
success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
If (success = 0) Then
    outFile.WriteLine(pdf.LastErrorText)
    WScript.Quit
End If

' Each time we verify a signature, information about the signature is written into
' sigInfo (replacing whatever sigInfo previously contained).
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set sigInfo = CreateObject("Chilkat.JsonObject")
sigInfo.EmitCompact = 0

' Iterate over each signature and validate each.
numSignatures = pdf.NumSignatures
validated = 0
i = 0
Do While i < numSignatures
    validated = pdf.VerifySignature(i,sigInfo)
    outFile.WriteLine("Signature " & i & " validated: " & validated)
    outFile.WriteLine(sigInfo.Emit())
    i = i + 1
Loop

outFile.WriteLine("Finished.")

' When VerifySignature validates a signature, a lot of information is deposited into the JSON sigInfo object.
' The information can vary depending on what was included in the signature (for example, various authenticated attributes
' and unauthenticated attributes may or may not be included).
' Here is a sample of the information you'll see.
' 
' The following online tool can be used to generate code to parse any given JSON.
' Generate Parsing Code from JSON

' {
'   "validated": true,
'   "signatureDictionary": {         <--- This is the contents of the PDF Signature Dictionary for this signature.
'     "/ByteRange": [
'       0,
'       154682,
'       170512,
'       3233
'     ],
'     "/Contents": "<hex_data>",
'     "/Filter": "/Adobe.PPKLite",        <--- The meaning of the Signature Dictionary entries are defined in the PDF format specification document.
'     "/M": "D:20201006110216-05'00'",
'     "/Name": "yubikey rsa 1024 authentication",
'     "/Prop_Build": {
'       "/App": {
'         "/Name": "/Adobe#20Acrobat#20Pro#20DC",
'         "/OS": [
'           "/Win"
'         ],
'         "/R": 1313792,
'         "/REx": "2020.012.20048",
'         "/TrustedMode": true
'       },
'       "/Filter": {
'         "/Date": "Sep 11 2020 16:30:54",
'         "/Name": "/Adobe.PPKLite",
'         "/R": 131104,
'         "/V": 2
'       },
'       "/PubSec": {
'         "/Date": "Sep 11 2020 16:30:54",
'         "/NonEFontNoWarn": true,
'         "/R": 131105
'       }
'     },
'     "/SubFilter": "/adbe.pkcs7.detached",
'     "/Type": "/Sig"
'   },
'   "pkcs7": {          <--- This is the content of the CMS signature.
'     "verify": {
'       "certs": [      <--- Each signing certificate is listed here (by issuer common name and signing cert's serail number (in hex))
'         {
'           "issuerCN": "yubikey rsa 1024 authentication",
'           "serial": "66BE58138D761E92BC594A722932657BE26D421F"
'         }
'       ],
'       "digestAlgorithms": [
'         "sha256"
'       ],
'       "signerInfo": [     <--- contains data from each SignerInfo
'         {
'           "cert": {
'             "serialNumber": "66BE58138D761E92BC594A722932657BE26D421F",
'             "issuerCN": "yubikey rsa 1024 authentication",
'             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
'             "digestAlgName": "SHA256"
'           },
'           "contentType": "1.2.840.113549.1.7.1",
'           "messageDigest": "btQOuSEvC31mdRFHtyEUPw8R9NuKfk0XPcQ6Lcmn6pk=",
'           "signingAlgOid": "1.2.840.113549.1.1.11",
'           "signingAlgName": "RSA-SHA256-PKCSV-1_5",
'           "authAttr": {     <--- CMS authenticated attributes are contained here.
'             "1.2.840.113583.1.1.8": {
'               "der": "MAA="
'             },
'             "1.2.840.113549.1.9.3": {
'               "name": "contentType",
'               "oid": "1.2.840.113549.1.7.1"
'             },
'             "1.2.840.113549.1.9.4": {
'               "name": "messageDigest",
'               "digest": "btQOuSEvC31mdRFHtyEUPw8R9NuKfk0XPcQ6Lcmn6pk="
'             }
'           },
'           "unauthAttr": {    <--- CMS unauthenticated attributes are contained here.
'             "1.2.840.113549.1.9.16.2.14": {
'               "name": "timestampToken",
'               "der": "MIIOvAYJKo ... Es/70g=",
'               "verify": {
'                 "digestAlgorithms": [
'                   "sha256"
'                 ],
'                 "signerInfo": [
'                   {
'                     "cert": {
'                       "serialNumber": "04CD3F8568AE76C61BB0FE7160CCA76D",
'                       "issuerCN": "DigiCert SHA2 Assured ID Timestamping CA",
'                       "digestAlgOid": "2.16.840.1.101.3.4.2.1",
'                       "digestAlgName": "SHA256"
'                     },
'                     "contentType": "1.2.840.113549.1.9.16.1.4",
'                     "signingTime": "201006160423Z",
'                     "messageDigest": "Atv5Rj3kidB8IR6CplYiX3o6De/k8SC6JJ6uUPAGO0g=",
'                     "signingAlgOid": "1.2.840.113549.1.1.1",
'                     "signingAlgName": "RSA-PKCSV-1_5",
'                     "authAttr": {
'                       "1.2.840.113549.1.9.3": {
'                         "name": "contentType",
'                         "oid": "1.2.840.113549.1.9.16.1.4"
'                       },
'                       "1.2.840.113549.1.9.5": {
'                         "name": "signingTime",
'                         "utctime": "201006160423Z"
'                       },
'                       "1.2.840.113549.1.9.16.2.12": {
'                         "name": "signingCertificate",
'                         "der": "MBowGDAWBBQDJb1QXtqWMC3CL0+gHkwovig0xQ=="
'                       },
'                       "1.2.840.113549.1.9.4": {
'                         "name": "messageDigest",
'                         "digest": "Atv5Rj3kidB8IR6CplYiX3o6De/k8SC6JJ6uUPAGO0g="
'                       }
'                     }
'                   }
'                 ]
'               },
'               "timestampSignatureVerified": true,
'               "tstInfo": {
'                 "tsaPolicyId": "2.16.840.1.114412.7.1",
'                 "messageImprint": {
'                   "hashAlg": "sha256",
'                   "digest": "gLJtrRWUSDfjzDkF1MfWG1wyHA6FrUJLkWMGRG+eMlA=",
'                   "digestMatches": true
'                 },
'                 "serialNumber": "00CE57E1113970607EF63B1D1160545321",
'                 "genTime": "20201006160423Z"
'               }
'             }
'           }
'         }
'       ],
'       "pkcs7": {
'         "verify": {
'           "certs": [
'             {
'               "issuerCN": "DigiCert SHA2 Assured ID Timestamping CA",
'               "serial": "04CD3F8568AE76C61BB0FE7160CCA76D"
'             },
'             {
'               "issuerCN": "DigiCert Assured ID Root CA",
'               "serial": "0AA125D6D6321B7E41E405DA3697C215"
'             }
'           ]
'         }
'       }
'     }
'   }
' }

' **** The point of this code is to show how to get at each desired piece of information contained in the signature.
' **** If your signature contains additional information not shown here, then you can use the online tool to generate the parse code.
' **** It is likely you're only interested in a few items of information, and therefore you wouldn't copy all of this code, but might
' **** choose to use bits and pieces to get the information you find important.

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = CreateObject("Chilkat.JsonObject")

' Imagine that the "json" object contains the information obtained by validating a signature...
' The code below was generated using the online tool:  Generate Parsing Code from JSON

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.DtObj")
set unauthAttrTimestampTokenTstInfoGenTime = CreateObject("Chilkat.DtObj")
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.DtObj")
set signingTime = CreateObject("Chilkat.DtObj")
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.DtObj")
set authAttrSigningTimeUtctime = CreateObject("Chilkat.DtObj")

validated = json.BoolOf("validated")
signatureDictionary_Contents = json.StringOf("signatureDictionary./Contents")
signatureDictionary_Filter = json.StringOf("signatureDictionary./Filter")
signatureDictionary_M = json.StringOf("signatureDictionary./M")
signatureDictionary_Name = json.StringOf("signatureDictionary./Name")
signatureDictionary_Prop_Build_App_Name = json.StringOf("signatureDictionary./Prop_Build./App./Name")
signatureDictionary_Prop_Build_App_R = json.IntOf("signatureDictionary./Prop_Build./App./R")
signatureDictionary_Prop_Build_App_REx = json.StringOf("signatureDictionary./Prop_Build./App./REx")
signatureDictionary_Prop_Build_App_TrustedMode = json.BoolOf("signatureDictionary./Prop_Build./App./TrustedMode")
signatureDictionary_Prop_Build_Filter_Date = json.StringOf("signatureDictionary./Prop_Build./Filter./Date")
signatureDictionary_Prop_Build_Filter_Name = json.StringOf("signatureDictionary./Prop_Build./Filter./Name")
signatureDictionary_Prop_Build_Filter_R = json.IntOf("signatureDictionary./Prop_Build./Filter./R")
signatureDictionary_Prop_Build_Filter_V = json.IntOf("signatureDictionary./Prop_Build./Filter./V")
signatureDictionary_Prop_Build_PubSec_Date = json.StringOf("signatureDictionary./Prop_Build./PubSec./Date")
signatureDictionary_Prop_Build_PubSec_NonEFontNoWarn = json.BoolOf("signatureDictionary./Prop_Build./PubSec./NonEFontNoWarn")
signatureDictionary_Prop_Build_PubSec_R = json.IntOf("signatureDictionary./Prop_Build./PubSec./R")
signatureDictionary_SubFilter = json.StringOf("signatureDictionary./SubFilter")
signatureDictionary_Type = json.StringOf("signatureDictionary./Type")
i = 0
count_i = json.SizeOfArray("signatureDictionary./ByteRange")
Do While i < count_i
    json.I = i
    intVal = json.IntOf("signatureDictionary./ByteRange[i]")
    i = i + 1
Loop
i = 0
count_i = json.SizeOfArray("signatureDictionary./Prop_Build./App./OS")
Do While i < count_i
    json.I = i
    strVal = json.StringOf("signatureDictionary./Prop_Build./App./OS[i]")
    i = i + 1
Loop
i = 0
count_i = json.SizeOfArray("pkcs7.verify.certs")
Do While i < count_i
    json.I = i
    issuerCN = json.StringOf("pkcs7.verify.certs[i].issuerCN")
    serial = json.StringOf("pkcs7.verify.certs[i].serial")
    i = i + 1
Loop
i = 0
count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms")
Do While i < count_i
    json.I = i
    strVal = json.StringOf("pkcs7.verify.digestAlgorithms[i]")
    i = i + 1
Loop
i = 0
count_i = json.SizeOfArray("pkcs7.verify.signerInfo")
Do While i < count_i
    json.I = i
    certSerialNumber = json.StringOf("pkcs7.verify.signerInfo[i].cert.serialNumber")
    certIssuerCN = json.StringOf("pkcs7.verify.signerInfo[i].cert.issuerCN")
    certDigestAlgOid = json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
    certDigestAlgName = json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName")
    contentType = json.StringOf("pkcs7.verify.signerInfo[i].contentType")
    messageDigest = json.StringOf("pkcs7.verify.signerInfo[i].messageDigest")
    signingAlgOid = json.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid")
    signingAlgName = json.StringOf("pkcs7.verify.signerInfo[i].signingAlgName")
    authAttr1_2_840_113583_1_1_8Der = json.StringOf("pkcs7.verify.signerInfo[i].authAttr.""1.2.840.113583.1.1.8"".der")
    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")
    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")
    unauthAttrTimestampTokenName = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".name")
    unauthAttrTimestampTokenDer = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".der")
    unauthAttrTimestampTokenTimestampSignatureVerified = json.BoolOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".timestampSignatureVerified")
    unauthAttrTimestampTokenTstInfoTsaPolicyId = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".tstInfo.tsaPolicyId")
    unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".tstInfo.messageImprint.hashAlg")
    unauthAttrTimestampTokenTstInfoMessageImprintDigest = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".tstInfo.messageImprint.digest")
    unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = json.BoolOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".tstInfo.messageImprint.digestMatches")
    unauthAttrTimestampTokenTstInfoSerialNumber = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".tstInfo.serialNumber")
    success = json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".tstInfo.genTime",0,unauthAttrTimestampTokenTstInfoGenTime)
    j = 0
    count_j = json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.digestAlgorithms")
    Do While j < count_j
        json.J = j
        strVal = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.digestAlgorithms[j]")
        j = j + 1
    Loop
    j = 0
    count_j = json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo")
    Do While j < count_j
        json.J = j
        certSerialNumber = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].cert.serialNumber")
        certIssuerCN = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].cert.issuerCN")
        certDigestAlgOid = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].cert.digestAlgOid")
        certDigestAlgName = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].cert.digestAlgName")
        contentType = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].contentType")
        success = json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].signingTime",0,signingTime)
        messageDigest = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].messageDigest")
        signingAlgOid = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].signingAlgOid")
        signingAlgName = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].signingAlgName")
        authAttrContentTypeName = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.3"".name")
        authAttrContentTypeOid = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.3"".oid")
        authAttrSigningTimeName = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.5"".name")
        success = json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.5"".utctime",0,authAttrSigningTimeUtctime)
        authAttrSigningCertificateName = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.16.2.12"".name")
        authAttrSigningCertificateDer = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.16.2.12"".der")
        authAttrMessageDigestName = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.4"".name")
        authAttrMessageDigestDigest = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo[j].authAttr.""1.2.840.113549.1.9.4"".digest")
        j = j + 1
    Loop
    i = i + 1
Loop
i = 0
count_i = json.SizeOfArray("pkcs7.verify.pkcs7.verify.certs")
Do While i < count_i
    json.I = i
    issuerCN = json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].issuerCN")
    serial = json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].serial")
    i = i + 1
Loop

outFile.Close

 

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