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(Tcl) 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 Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set pdf [new_CkPdf]

# Load a PDF that has cryptographic signatures to be validated
set success [CkPdf_LoadFile $pdf "qa_data/pdf/sign_testing_1/helloSigned2.pdf"]
if {$success == 0} then {
    puts [CkPdf_lastErrorText $pdf]
    delete_CkPdf $pdf
    exit
}

# Each time we verify a signature, information about the signature is written into
# sigInfo (replacing whatever sigInfo previously contained).
set sigInfo [new_CkJsonObject]

CkJsonObject_put_EmitCompact $sigInfo 0

# Iterate over each signature and validate each.
set numSignatures [CkPdf_get_NumSignatures $pdf]
set validated 0
set i 0
while {$i < $numSignatures} {
    set validated [CkPdf_VerifySignature $pdf $i $sigInfo]
    puts "Signature $i validated: $validated"
    puts [CkJsonObject_emit $sigInfo]
    set i [expr $i + 1]
}

puts "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.

set json [new_CkJsonObject]

# 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

set unauthAttrTimestampTokenTstInfoGenTime [new_CkDtObj]

set signingTime [new_CkDtObj]

set authAttrSigningTimeUtctime [new_CkDtObj]

set validated [CkJsonObject_BoolOf $json "validated"]
set signatureDictionary_Contents [CkJsonObject_stringOf $json "signatureDictionary./Contents"]
set signatureDictionary_Filter [CkJsonObject_stringOf $json "signatureDictionary./Filter"]
set signatureDictionary_M [CkJsonObject_stringOf $json "signatureDictionary./M"]
set signatureDictionary_Name [CkJsonObject_stringOf $json "signatureDictionary./Name"]
set signatureDictionary_Prop_Build_App_Name [CkJsonObject_stringOf $json "signatureDictionary./Prop_Build./App./Name"]
set signatureDictionary_Prop_Build_App_R [CkJsonObject_IntOf $json "signatureDictionary./Prop_Build./App./R"]
set signatureDictionary_Prop_Build_App_REx [CkJsonObject_stringOf $json "signatureDictionary./Prop_Build./App./REx"]
set signatureDictionary_Prop_Build_App_TrustedMode [CkJsonObject_BoolOf $json "signatureDictionary./Prop_Build./App./TrustedMode"]
set signatureDictionary_Prop_Build_Filter_Date [CkJsonObject_stringOf $json "signatureDictionary./Prop_Build./Filter./Date"]
set signatureDictionary_Prop_Build_Filter_Name [CkJsonObject_stringOf $json "signatureDictionary./Prop_Build./Filter./Name"]
set signatureDictionary_Prop_Build_Filter_R [CkJsonObject_IntOf $json "signatureDictionary./Prop_Build./Filter./R"]
set signatureDictionary_Prop_Build_Filter_V [CkJsonObject_IntOf $json "signatureDictionary./Prop_Build./Filter./V"]
set signatureDictionary_Prop_Build_PubSec_Date [CkJsonObject_stringOf $json "signatureDictionary./Prop_Build./PubSec./Date"]
set signatureDictionary_Prop_Build_PubSec_NonEFontNoWarn [CkJsonObject_BoolOf $json "signatureDictionary./Prop_Build./PubSec./NonEFontNoWarn"]
set signatureDictionary_Prop_Build_PubSec_R [CkJsonObject_IntOf $json "signatureDictionary./Prop_Build./PubSec./R"]
set signatureDictionary_SubFilter [CkJsonObject_stringOf $json "signatureDictionary./SubFilter"]
set signatureDictionary_Type [CkJsonObject_stringOf $json "signatureDictionary./Type"]
set i 0
set count_i [CkJsonObject_SizeOfArray $json "signatureDictionary./ByteRange"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set intVal [CkJsonObject_IntOf $json "signatureDictionary./ByteRange[i]"]
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $json "signatureDictionary./Prop_Build./App./OS"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set strVal [CkJsonObject_stringOf $json "signatureDictionary./Prop_Build./App./OS[i]"]
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $json "pkcs7.verify.certs"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set issuerCN [CkJsonObject_stringOf $json "pkcs7.verify.certs[i].issuerCN"]
    set serial [CkJsonObject_stringOf $json "pkcs7.verify.certs[i].serial"]
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $json "pkcs7.verify.digestAlgorithms"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set strVal [CkJsonObject_stringOf $json "pkcs7.verify.digestAlgorithms[i]"]
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $json "pkcs7.verify.signerInfo"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set certSerialNumber [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.serialNumber"]
    set certIssuerCN [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.issuerCN"]
    set certDigestAlgOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.digestAlgOid"]
    set certDigestAlgName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.digestAlgName"]
    set contentType [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].contentType"]
    set messageDigest [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].messageDigest"]
    set signingAlgOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].signingAlgOid"]
    set signingAlgName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].signingAlgName"]
    set authAttr1_2_840_113583_1_1_8Der [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113583.1.1.8\".der"]
    set authAttrContentTypeName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name"]
    set authAttrContentTypeOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid"]
    set authAttrMessageDigestName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name"]
    set authAttrMessageDigestDigest [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest"]
    set unauthAttrTimestampTokenName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".name"]
    set unauthAttrTimestampTokenDer [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".der"]
    set unauthAttrTimestampTokenTimestampSignatureVerified [CkJsonObject_BoolOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".timestampSignatureVerified"]
    set unauthAttrTimestampTokenTstInfoTsaPolicyId [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.tsaPolicyId"]
    set unauthAttrTimestampTokenTstInfoMessageImprintHashAlg [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.hashAlg"]
    set unauthAttrTimestampTokenTstInfoMessageImprintDigest [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.digest"]
    set unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches [CkJsonObject_BoolOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.digestMatches"]
    set unauthAttrTimestampTokenTstInfoSerialNumber [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.serialNumber"]
    CkJsonObject_DtOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.genTime" 0 $unauthAttrTimestampTokenTstInfoGenTime
    set j 0
    set count_j [CkJsonObject_SizeOfArray $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.digestAlgorithms"]
    while {$j < $count_j} {
        CkJsonObject_put_J $json $j
        set strVal [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.digestAlgorithms[j]"]
        set j [expr $j + 1]
    }
    set j 0
    set count_j [CkJsonObject_SizeOfArray $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo"]
    while {$j < $count_j} {
        CkJsonObject_put_J $json $j
        set certSerialNumber [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.serialNumber"]
        set certIssuerCN [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.issuerCN"]
        set certDigestAlgOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.digestAlgOid"]
        set certDigestAlgName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.digestAlgName"]
        set contentType [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].contentType"]
        CkJsonObject_DtOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingTime" 0 $signingTime
        set messageDigest [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].messageDigest"]
        set signingAlgOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingAlgOid"]
        set signingAlgName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingAlgName"]
        set authAttrContentTypeName [CkJsonObject_stringOf $json "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"]
        set authAttrContentTypeOid [CkJsonObject_stringOf $json "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"]
        set authAttrSigningTimeName [CkJsonObject_stringOf $json "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"]
        CkJsonObject_DtOf $json "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
        set authAttrSigningCertificateName [CkJsonObject_stringOf $json "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"]
        set authAttrSigningCertificateDer [CkJsonObject_stringOf $json "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"]
        set authAttrMessageDigestName [CkJsonObject_stringOf $json "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"]
        set authAttrMessageDigestDigest [CkJsonObject_stringOf $json "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"]
        set j [expr $j + 1]
    }
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $json "pkcs7.verify.pkcs7.verify.certs"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set issuerCN [CkJsonObject_stringOf $json "pkcs7.verify.pkcs7.verify.certs[i].issuerCN"]
    set serial [CkJsonObject_stringOf $json "pkcs7.verify.pkcs7.verify.certs[i].serial"]
    set i [expr $i + 1]
}

delete_CkPdf $pdf
delete_CkJsonObject $sigInfo
delete_CkJsonObject $json
delete_CkDtObj $unauthAttrTimestampTokenTstInfoGenTime
delete_CkDtObj $signingTime
delete_CkDtObj $authAttrSigningTimeUtctime

 

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