PowerBuilder
PowerBuilder
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 PowerBuilder Downloads
integer li_rc
long li_Success
oleobject loo_Pdf
oleobject loo_SigInfo
long li_NumSignatures
long li_Validated
long i
oleobject loo_Json
oleobject loo_UnauthAttrTimestampTokenTstInfoGenTime
oleobject loo_SigningTime
oleobject loo_AuthAttrSigningTimeUtctime
long li_IntVal
string ls_StrVal
string ls_IssuerCN
string ls_Serial
string ls_CertSerialNumber
string ls_CertIssuerCN
string ls_CertDigestAlgOid
string ls_CertDigestAlgName
string ls_ContentType
string ls_MessageDigest
string ls_SigningAlgOid
string ls_SigningAlgName
string ls_AuthAttr1_2_840_113583_1_1_8Der
string ls_AuthAttrContentTypeName
string ls_AuthAttrContentTypeOid
string ls_AuthAttrMessageDigestName
string ls_AuthAttrMessageDigestDigest
string ls_UnauthAttrTimestampTokenName
string ls_UnauthAttrTimestampTokenDer
long li_UnauthAttrTimestampTokenTimestampSignatureVerified
string ls_UnauthAttrTimestampTokenTstInfoTsaPolicyId
string ls_UnauthAttrTimestampTokenTstInfoMessageImprintHashAlg
string ls_UnauthAttrTimestampTokenTstInfoMessageImprintDigest
long li_UnauthAttrTimestampTokenTstInfoMessageImprintDigestMatches
string ls_UnauthAttrTimestampTokenTstInfoSerialNumber
long j
long li_Count_j
string ls_AuthAttrSigningTimeName
string ls_AuthAttrSigningCertificateName
string ls_AuthAttrSigningCertificateDer
string ls_SignatureDictionary_Contents
string ls_SignatureDictionary_Filter
string ls_SignatureDictionary_M
string ls_SignatureDictionary_Name
string ls_SignatureDictionary_Prop_Build_App_Name
long li_SignatureDictionary_Prop_Build_App_R
string ls_SignatureDictionary_Prop_Build_App_REx
long li_SignatureDictionary_Prop_Build_App_TrustedMode
string ls_SignatureDictionary_Prop_Build_Filter_Date
string ls_SignatureDictionary_Prop_Build_Filter_Name
long li_SignatureDictionary_Prop_Build_Filter_R
long li_SignatureDictionary_Prop_Build_Filter_V
string ls_SignatureDictionary_Prop_Build_PubSec_Date
long li_SignatureDictionary_Prop_Build_PubSec_NonEFontNoWarn
long li_SignatureDictionary_Prop_Build_PubSec_R
string ls_SignatureDictionary_SubFilter
string ls_SignatureDictionary_Type
long li_Count_i
li_Success = 0
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
loo_Pdf = create oleobject
li_rc = loo_Pdf.ConnectToNewObject("Chilkat.Pdf")
if li_rc < 0 then
destroy loo_Pdf
MessageBox("Error","Connecting to COM object failed")
return
end if
// Load a PDF that has cryptographic signatures to be validated
li_Success = loo_Pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
if li_Success = 0 then
Write-Debug loo_Pdf.LastErrorText
destroy loo_Pdf
return
end if
// Each time we verify a signature, information about the signature is written into
// sigInfo (replacing whatever sigInfo previously contained).
loo_SigInfo = create oleobject
li_rc = loo_SigInfo.ConnectToNewObject("Chilkat.JsonObject")
loo_SigInfo.EmitCompact = 0
// Iterate over each signature and validate each.
li_NumSignatures = loo_Pdf.NumSignatures
li_Validated = 0
i = 0
do while i < li_NumSignatures
li_Validated = loo_Pdf.VerifySignature(i,loo_SigInfo)
Write-Debug "Signature " + string(i) + " validated: " + string(li_Validated)
Write-Debug loo_SigInfo.Emit()
i = i + 1
loop
Write-Debug "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.
loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("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
loo_UnauthAttrTimestampTokenTstInfoGenTime = create oleobject
li_rc = loo_UnauthAttrTimestampTokenTstInfoGenTime.ConnectToNewObject("Chilkat.DtObj")
loo_SigningTime = create oleobject
li_rc = loo_SigningTime.ConnectToNewObject("Chilkat.DtObj")
loo_AuthAttrSigningTimeUtctime = create oleobject
li_rc = loo_AuthAttrSigningTimeUtctime.ConnectToNewObject("Chilkat.DtObj")
li_Validated = loo_Json.BoolOf("validated")
ls_SignatureDictionary_Contents = loo_Json.StringOf("signatureDictionary./Contents")
ls_SignatureDictionary_Filter = loo_Json.StringOf("signatureDictionary./Filter")
ls_SignatureDictionary_M = loo_Json.StringOf("signatureDictionary./M")
ls_SignatureDictionary_Name = loo_Json.StringOf("signatureDictionary./Name")
ls_SignatureDictionary_Prop_Build_App_Name = loo_Json.StringOf("signatureDictionary./Prop_Build./App./Name")
li_SignatureDictionary_Prop_Build_App_R = loo_Json.IntOf("signatureDictionary./Prop_Build./App./R")
ls_SignatureDictionary_Prop_Build_App_REx = loo_Json.StringOf("signatureDictionary./Prop_Build./App./REx")
li_SignatureDictionary_Prop_Build_App_TrustedMode = loo_Json.BoolOf("signatureDictionary./Prop_Build./App./TrustedMode")
ls_SignatureDictionary_Prop_Build_Filter_Date = loo_Json.StringOf("signatureDictionary./Prop_Build./Filter./Date")
ls_SignatureDictionary_Prop_Build_Filter_Name = loo_Json.StringOf("signatureDictionary./Prop_Build./Filter./Name")
li_SignatureDictionary_Prop_Build_Filter_R = loo_Json.IntOf("signatureDictionary./Prop_Build./Filter./R")
li_SignatureDictionary_Prop_Build_Filter_V = loo_Json.IntOf("signatureDictionary./Prop_Build./Filter./V")
ls_SignatureDictionary_Prop_Build_PubSec_Date = loo_Json.StringOf("signatureDictionary./Prop_Build./PubSec./Date")
li_SignatureDictionary_Prop_Build_PubSec_NonEFontNoWarn = loo_Json.BoolOf("signatureDictionary./Prop_Build./PubSec./NonEFontNoWarn")
li_SignatureDictionary_Prop_Build_PubSec_R = loo_Json.IntOf("signatureDictionary./Prop_Build./PubSec./R")
ls_SignatureDictionary_SubFilter = loo_Json.StringOf("signatureDictionary./SubFilter")
ls_SignatureDictionary_Type = loo_Json.StringOf("signatureDictionary./Type")
i = 0
li_Count_i = loo_Json.SizeOfArray("signatureDictionary./ByteRange")
do while i < li_Count_i
loo_Json.I = i
li_IntVal = loo_Json.IntOf("signatureDictionary./ByteRange[i]")
i = i + 1
loop
i = 0
li_Count_i = loo_Json.SizeOfArray("signatureDictionary./Prop_Build./App./OS")
do while i < li_Count_i
loo_Json.I = i
ls_StrVal = loo_Json.StringOf("signatureDictionary./Prop_Build./App./OS[i]")
i = i + 1
loop
i = 0
li_Count_i = loo_Json.SizeOfArray("pkcs7.verify.certs")
do while i < li_Count_i
loo_Json.I = i
ls_IssuerCN = loo_Json.StringOf("pkcs7.verify.certs[i].issuerCN")
ls_Serial = loo_Json.StringOf("pkcs7.verify.certs[i].serial")
i = i + 1
loop
i = 0
li_Count_i = loo_Json.SizeOfArray("pkcs7.verify.digestAlgorithms")
do while i < li_Count_i
loo_Json.I = i
ls_StrVal = loo_Json.StringOf("pkcs7.verify.digestAlgorithms[i]")
i = i + 1
loop
i = 0
li_Count_i = loo_Json.SizeOfArray("pkcs7.verify.signerInfo")
do while i < li_Count_i
loo_Json.I = i
ls_CertSerialNumber = loo_Json.StringOf("pkcs7.verify.signerInfo[i].cert.serialNumber")
ls_CertIssuerCN = loo_Json.StringOf("pkcs7.verify.signerInfo[i].cert.issuerCN")
ls_CertDigestAlgOid = loo_Json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
ls_CertDigestAlgName = loo_Json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName")
ls_ContentType = loo_Json.StringOf("pkcs7.verify.signerInfo[i].contentType")
ls_MessageDigest = loo_Json.StringOf("pkcs7.verify.signerInfo[i].messageDigest")
ls_SigningAlgOid = loo_Json.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid")
ls_SigningAlgName = loo_Json.StringOf("pkcs7.verify.signerInfo[i].signingAlgName")
ls_AuthAttr1_2_840_113583_1_1_8Der = loo_Json.StringOf("pkcs7.verify.signerInfo[i].authAttr.~"1.2.840.113583.1.1.8~".der")
ls_AuthAttrContentTypeName = loo_Json.StringOf("pkcs7.verify.signerInfo[i].authAttr.~"1.2.840.113549.1.9.3~".name")
ls_AuthAttrContentTypeOid = loo_Json.StringOf("pkcs7.verify.signerInfo[i].authAttr.~"1.2.840.113549.1.9.3~".oid")
ls_AuthAttrMessageDigestName = loo_Json.StringOf("pkcs7.verify.signerInfo[i].authAttr.~"1.2.840.113549.1.9.4~".name")
ls_AuthAttrMessageDigestDigest = loo_Json.StringOf("pkcs7.verify.signerInfo[i].authAttr.~"1.2.840.113549.1.9.4~".digest")
ls_UnauthAttrTimestampTokenName = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".name")
ls_UnauthAttrTimestampTokenDer = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".der")
li_UnauthAttrTimestampTokenTimestampSignatureVerified = loo_Json.BoolOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".timestampSignatureVerified")
ls_UnauthAttrTimestampTokenTstInfoTsaPolicyId = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".tstInfo.tsaPolicyId")
ls_UnauthAttrTimestampTokenTstInfoMessageImprintHashAlg = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".tstInfo.messageImprint.hashAlg")
ls_UnauthAttrTimestampTokenTstInfoMessageImprintDigest = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".tstInfo.messageImprint.digest")
li_UnauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = loo_Json.BoolOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".tstInfo.messageImprint.digestMatches")
ls_UnauthAttrTimestampTokenTstInfoSerialNumber = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".tstInfo.serialNumber")
loo_Json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".tstInfo.genTime",0,loo_UnauthAttrTimestampTokenTstInfoGenTime)
j = 0
li_Count_j = loo_Json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.digestAlgorithms")
do while j < li_Count_j
loo_Json.J = j
ls_StrVal = loo_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
li_Count_j = loo_Json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo")
do while j < li_Count_j
loo_Json.J = j
ls_CertSerialNumber = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].cert.serialNumber")
ls_CertIssuerCN = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].cert.issuerCN")
ls_CertDigestAlgOid = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].cert.digestAlgOid")
ls_CertDigestAlgName = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].cert.digestAlgName")
ls_ContentType = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].contentType")
loo_Json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].signingTime",0,loo_SigningTime)
ls_MessageDigest = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].messageDigest")
ls_SigningAlgOid = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].signingAlgOid")
ls_SigningAlgName = loo_Json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.~"1.2.840.113549.1.9.16.2.14~".verify.signerInfo[j].signingAlgName")
ls_AuthAttrContentTypeName = loo_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")
ls_AuthAttrContentTypeOid = loo_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")
ls_AuthAttrSigningTimeName = loo_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")
loo_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,loo_AuthAttrSigningTimeUtctime)
ls_AuthAttrSigningCertificateName = loo_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")
ls_AuthAttrSigningCertificateDer = loo_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")
ls_AuthAttrMessageDigestName = loo_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")
ls_AuthAttrMessageDigestDigest = loo_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
li_Count_i = loo_Json.SizeOfArray("pkcs7.verify.pkcs7.verify.certs")
do while i < li_Count_i
loo_Json.I = i
ls_IssuerCN = loo_Json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].issuerCN")
ls_Serial = loo_Json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].serial")
i = i + 1
loop
destroy loo_Pdf
destroy loo_SigInfo
destroy loo_Json
destroy loo_UnauthAttrTimestampTokenTstInfoGenTime
destroy loo_SigningTime
destroy loo_AuthAttrSigningTimeUtctime